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Q: we have had moisture in our pnuematic system with Barber-Coleman stats, can they be re-conditioned back to operable?
Submitted by: warren peterson, head custodian frederic school district
+ A:
A: The removal of the moisture in your system, as well as the cause for the moisture in the system should be removed before addressing any controls issues caused by the moisture. Look up our part number PNSC-02 to see a method of removing moisture from the system. This solution may be applied with the pneumatic controls in-line, allowing for the possible demoisturization of the controls. Depending on the length of time, and depth of the contamination some of the controls may still be used. Due to labor costs, it is actually less expensive to replace controls rather than rebuild them. Replacement restrictor kits, etc.for some Barber Colman thermostats, are available if you are interested. Call us at 800-227-9800.
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Q: Availability of change DOS driven software program to something that is up-to-date
Submitted by: John Gramkowski, Maintenance Mechanic Palmyra Schools
+ A:
A: Call us at 800-227-9800 to discuss transitioning your current system to one that is more user friendly.
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Q: Need help for Barber Coleman VAV pneumatic type need some information on balanceing or even doing a retro fix
Submitted by: Milt Henderson, Taggert Student center Mat.Sup. Utah State University
+ A:
A: The best retrofit solution for pneumatic VAVs are the KMC CSC-3000 series controllers. The CSC-3011-10 and CSC-3025-10 are the rulers of the pneumatically operated drop ceiling. I prefer the CSC-3025 as it seems to set up a little more quickly. You can see both of these controls on the Parts Search area of this site. Dont hesitate to call us for help with accessories and such.
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Q: johnson controles air system how to find leek in air lines thease small lines go all over the bildingis there something Ican use in the lines that mite show where leek is.please let me know
Submitted by: keith boyd, maintance scioto county board of MR/DD
+ A:
A: Leaks are always evasive. Depending upon the expanse of your system, you can employ gauges in specific zones, to ensure good air pressure on a zone-by-zone basis. Sonic testers, such as the tye used on steam traps may be of help. Soem people like introducing odors to the system, and trying to find their concentrations. I dont like this method, as many of the controls will standardly bleed air and the odor, making it difficult to distinguish leaky areas from standard bleed-offs. Personally, I like the idea of isolating runs with gauges to help identify undue pressure drops.
You may find it easier to re-pipe areas, rather than hunt for the leaks. You have to decide which method is the most economical for your building and your team.
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Q: Can we get V-3802 Johnson Control Actuator oval Diaphrams
Submitted by: Jeff Sullivan, Maintenance Supervisor Conrad School District
+ A:
A: Absolutely. Call us at 800-227-9800. They are on the shelf in our warehouse, ready to ship.
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Q: I have a Johnson Control T-4002 2 tube, Thermostat that I am replacing. Can you tell me how to calibrate it.
Submitted by: George Henderson, Maintenance H.W. Krauth
+ A:
A: 1. Measure the temperature of the controlled medium with an accurate thermometer. 2. Adjust the setpoint to match the temperature measured in step 1. 3. Adjust the calibration screw until branch pressure measures 8 psig or mid spring range of the controlled device. 4. Adjust setpoint to desired value. 5. Check the sensitivity to ensure proper system reaction to change.
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Q: I have a pneuline controls filter that has a indicator on top that has broken Model OCF112P. Can you supply a new part and at what price.
Submitted by: Jim C ondon, Engineer Taunton State Hospital
+ A:
A: Call us at 800-227-9800. We will be happy to help you identify the part you need.
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Q: looking for advice on calibrating thermostats and reciever controlers for a pneumatic system
Submitted by: Eric Poore, field sevices Norwich Public Utilities
+ A:
A: The best advice we can lend is to participate in one of our Pneumatic Controls Fundamentals training opportunities. Check the training page of our web site to see when our next class will be held. If you do not want to travel to our training center, call us to find out about bringing our class to your facility.
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Q: I really dont have uch exposure in pnuematics. I was intrested in how I can calibrate a pnuematic Therostat.
Submitted by: Banks
+ A:
A: 1. Measure the temperature of the controlled medium with an accurate thermometer. 2. Adjust the setpoint to match the temperature measured in step 1. 3. Adjust the calibration screw until branch pressure measures 8 psig or mid spring range of the controlled device. 4. Adjust setpoint to desired value. 5. Check the sensitivity to ensure proper system reaction to changes.
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Q: Good Morning,
I have a free standing, non-ventilated space heater with a set of gas logs. It has provisions for the connection of a thermostat to operate the logs automatically.
I have shopped my local Home Depot Store for thermostats suitable for this application and I want to comfirm my findings. There is a selection of thermostats designed for line voltage control and I am confident they are not sutiable for me but there is another group of thermostats that appear to be suitable for 24 volt control as well as milivolt control. I believe any of those thermostats will be suitable for my application.
My control voltage is what is produced by the thermocouple and is used to operate the gas valve. Please confirm my thinking or point me in the correct direction.
Sincerely
Bill Shivers
Submitted by: Bill Shivers
+ A:
A: Thanks for the question, Bill. Let us know where you hail from and well suggest a qualified HVAC/Plumbing contractor in your area, to help you out.
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Q: WOULD LIKE INFO. ON CODE FOR INSTALLING A PVC GAS FLUE ON A CONDENSING GAS FURNACE TO AN EXISTING BRICK CLAY LINED CHIMNEY THAT HAD BEEN USED FOR THE OLD OIL FURNACE. CAN YOU HELP?
Submitted by: MITCH WOOD, ELECTRONIC CONTROLS LEADER DEPT OF NAVY
+ A:
A: The code for this is in the International Mechanical Code & International fuel Gas Code. Both are issued by The International Code Council www.iccsafe.org.
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Q: AM INTERESTED IN ON-LINE DDC TRAINING OF ALL MFG'S SYSTEMS. WE HAVE TAC, ASI, JOHNSON,SIEMANS, HONEYWELL, ETC.. ANY INFO ON FREE TRAINING SITES WOULD BE APPRECIATED. ALSO CAN TRAVEL TO ONE OR TWO SCHOOLS PER YEAR. DO YOU KNOW OF ANY GOOD ONES!
Submitted by: MITCH WOOD, ELECTRONIC INDUSTRIAL CONTROLS MECHANIC DEPT. OF NAVY
+ A:
A: You may want to visit www.napenational.org and look at the educational materials page. They have an extensive offering of DVDs, video tapes and on-line course.
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Q: I need a cross reference for pneumatic temperature and humidity transmitters to and from johnson and B/C
Submitted by: frank kornowicz
+ A:
A: If you check our catalog, "HVAC Guidebook", you may find what youre looking for. There are charts representing several manufacturers transmitters and ranges. Please note that each manufacturers transmitter range may not match exactly. You will need to find the one with the closest range for your application, and then make sure to select the appropriate receiver gauge to match. For a printed copy of our book, or CD-rom, please call us at 800-227-9800.
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Q: I have 2 Cleaver Brooks boilers. I want to use my existing McDonnell No. 94-7b proportioning control to control electric ball valves instead of the Honeywell motor actuated globe valves. Would you be able to supply the interface from the Mcdonnell control and the corresponding 1 1/2 inch electric ball valves?
Thanks,
Submitted by: Jim Toner, Chief of Plant Ops. JFK Medical Center
+ A:
A: We would need to know the control signal for the ball valves.
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Q: (Not very experienced with pneumatics)
I have a Johnson Controls thermostat model T4756. I just found out that the DA and RA bimetal elements can either be DA on top-RA on botton or vice versa. Found out that the wrong stat was installed in one of our offices. DA was on bottom and RA on top. We have reverse acting cooling- valve opens (no air) on rise in temperature at 15 psi. Heating is 20 psi. The stat I changed out was like for like- DA on bottom and RA on top. It didn't work and was changed for other model, DA on bottom, RA on top. Please confirm if the placement of DA either on top or bottom determines whether it is operating at 15 or 20 psi. I'm guessing it is from what I found out. Does your pneumatics class cover issues like this?
Submitted by: Tim Loretta, hvac tech KIRA
+ A:
A: On the T-4756, the lower element is on control at 15 PSI supply pressure; the upper element at 20PSI. th switchover pressure is 17.5 PSI. You can visibly tell a DA element by the visible stripes on it. The action of the elements are defined by part number. The T-4756-201 has 15PSI DA and 20PSI RA. The T-4756-206 has 15PSI RA and 20 PSI DA. Give us a call at 800-227-9800 and we will help you select the correct model for your application.
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Q: I need to know how to calibrate honeywell pnumatic humidistats.
Submitted by: Tony Imbo, HVAC Mechanic Goodrich
+ A:
A: After installing the humidistat, set the humidistat to the desired setpoint and let the system operate long enough to stabilize. The length of time required for stabilization depends on system response time and could be only a few minutes or as long as several hours. Verify that the system has stabilized before checking calibration.
NOTE: Humidistats and humidity sensors are factory calibrated and should require only a bleed-off check to ensure correct operation. The throttling range is factory set and should not require adjustment under normal operating conditions.
Humidistats are extremely sensitive. Handle humidistats carefully during recalibration.
HP970 and HP972
The procedure in this section assumes that a calibration check has been performed (see CALIBRATION CHECK) and that the humidistat has not operated correctly.
1.
Start with main air pressure at 18 psi (124 kPa) nominal or system pressure between 13 and 18 psi (91 and 124 kPa).
2.
Assemble Gage and Gage Port Needle.
3.
Insert Gage Port Needle in humidistat gage tap.
4.
Set humidity setpoint indicator at humidity measured during CALIBRATION CHECK procedure.
5.
Turn calibration screw until Gage reads 0 psi.
6.
Turn calibration screw in opposite direction until Gage reads 8 psi (55 kPa) ±1 psi (±7 kPa).
7.
Allow 5 to 10 seconds for HP970, 30 to 60 seconds for HP972, for complete response. Setpoint and actual rh should be within acceptable limits.
8.
Repeat appropriate procedure under CALIBRATION CHECK to verify calibration.
9.
Remove Gage and replace cover.
10.
Adjust humidistat setpoint indicator to desired setpoint.
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Q: I am trying to get a better understanding about reading my gauges like reading presure
Submitted by: chris , maintenic tech
+ A:
A: Gauge readings are the most fundamental of trouble shooting tools. If you know what pressures, temperatures or conditions you are supposed to have in your system, properly placed gauges give you a view in to what is truly happening in your system. For example, if you know you are supposed to be producing 65 psi, and your gauge is reading 64 psi, it is probably not indicating a big problem; but if that gauge is reading 35 psi, you know you have some work to do to get that system up to its proper operating pressure.
Guages are like a roadmap: if you know where you want to go, the map can help you get there. If you dont know what condition you are looking for, a gauge reading will not help you. Get a firm grasp on the operating pressures, temperatures, etc. in your system, and you gauges will help you to maintain the system at higher efficiencies.
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Q: My name is james and I have a few questions about the HW-TB6980 zone stat. Does the 50014157-001 go in the supply run or can it go in the return?do I need a change over stat in the supply to opperate correctly or can this stat be a stand alone and switch by its self. I am attempting to control a small zone using just a damper and a 24va trans for power.any help would be apreciated.I was just given a box of parts and told make it work.
Submitted by: J DEACON, AC MECH ACCO ENGINEERED SYSTEMS
+ A:
A: If you want to set it up for autochangeover, the sensor should be placed in the supply duct. Automatic changeover is accomplished when the ambient temperature is either cooler or warmer than the supply air temperature by 9 degrees F.
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Q: Electronic Ignition Gas fired furnaces,when called for heating no respond what is the first thing to ck on module,and we are getng voltage?
Submitted by: Ben Montoya, facility mgr tohono o'odham nation
+ A:
A: First thing to check is for proper grounding; then move on to voltage in and out. From that point, the manufacturers spec sheets usually provide a comprehensive troubleshooting guide.
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Q: I am looking for a cut sheet on a Barber-Colman acutator ass.Part # MA-318-0-0-2
Submitted by: John, HVAC Steam Fitter Atlantic Westchester
+ A:
A: You should have received an email by now with the requested document attached.
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Q: My valves are not functioning properly. I inherited a building with a lot of tubing that is disconnected and plugged
Submitted by: Kelly Yazzie, Mechanical Foreman KUSD #27
+ A:
A: Having inherited the system, evaluate whether or not you will need help getting this particular system squared away. If you need help, petition for it. If not, lets begin. If there is no print available, first thing is to trace the tubing back to its origins; thermostats, controllers, transmitters, etc., to figure out what is supposed to be controlling what. Next, begin reconnecting the tubing to the appropriate places. Be sure to check the condition of your air supply to be sure you have clean, dry, oil free air to power the controls. If there is no print, and the control scheme is not obvious, you may have to sit down and write a control statement of your own, taking in to consideration all of the equipment and controls contained in your system; if theres no roadmap, write one yourself. Key considerations must be safety, comfort and efficiency. Once youve established the path to travel, begin testing and calibrating the thermostats and controllers, all of the devices on the system, so they will do what you need and expect them to do. Set out a specific plan of attack, placing priority to the most important areas of your building(s). This process may take some time, so be patient, be methodical and communicate realistic expectations for yourself, the people working for and with you, and your employer.
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Q: I'm looking for pneumatic temperature transmitter calibration chart it used to be in your catalog and I have missed place mine
Submitted by: Victor Pelletier Boston AirControls Inc.
+ A:
A: Good to hear from you, Victor. You now have the chart. It may also be found at
http://neccdelivers.com/_eng_docs/Calibration_Card_1.pdf.
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Q: LOOKING FOR A DIGITAL STEAM PRESSURETROL
Submitted by: GEORGE, INSIDE SALES WEBB
+ A:
A: Use Honeywells new T775U Universal controller along with an appropriate pressure transmitter (0-10 vdc or 4-20mA). You can set the T775 to read in whatever engineering units you need, such as PSIG or inches W.C..
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Q: How to calibrate properly a Robert Shaw pneumatic Thermostat? Thankyou in advance.
Submitted by: Edgar Gallardo, Maitenance Eng. Aladdin Developers
+ A:
A: Remove the thermostat cover. Before beginning your calibration move the throttling range adjustment slide to a point where it rests on the top of the calibration wrench (RSAT1) when it inserts in the calibration screw. Insert gauge and gauge adapter (RSGA1) in to the branch pressure tap port. Measure the temperature in the space. Move the setpoint adjustment to reflect the measured temperature. Turn the calibration screw until the branch output equals the mid-spring of the controlled device(s) or 8 psig. Move the setpoint adjustment to your desired setpoint. Remove tools and replace the cover.
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Q: what is the proper way to string up the cap tube on a t8000 tstat i was told that it should be always on a down hill state or zig zag across return air duct to operate correctly is this true? also how do i calibrate the t8000 to modulate properly.
Submitted by: michael, HVAC foreman university of southern miss
+ A:
A: According to Johnson Controls, the position of the sensing element will not effect the operation of the instrument. An averaging element, however, should be arranged in a "Z" pattern, insuring that as great a cross-section of the duct as possible is being sensed.
The thermostat can be made direct or reverse acting by changing the position of the sliding control port. Repositioning the control port will also change sensitivity on proportional models and differential on two-position models. For a direct acting instument, the sliding control port should be positioned above the midpoint on the slider rail. For a reverse acting instrument the slider control port should be positioned below the midpoint of the slider rail. The rail is marked DA at the top and RA at the bottom. Moving the slider upward from the midpoint on the rail increases sensitivity and decreases differential for direct acting applications. Moving the slider downward from the midpoint on the rail increases the sensitivity and decreases the differential for reverse acting applications.
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Q: Searching for Data Logger
Submitted by: Fred Bookhoop, Assistant Service Manager Erickson Associates, Inc.
+ A:
A: We have many data loggers available for various applications. The most common are the temperature & relative humidity models. On this site, in parts search, index the following part number: SP-USB-2. If you are looking for something else contact us at 800-227-9800.
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Q: How do I size up a air compressor?
Submitted by: Tom Gendreau, H.V.AC Technician Bates college
+ A:
A: 1. Count the devices connected to the control system that uses air. 2. List the model and function of each device. 3. Look up to air use (in scim) in the factory manuals. Total the air consumption of your control system. 5. Divide the scims by 1728 to convert to scfms. Multiply the scfms by 3 to accommodate the recommended one third run time. Order the compressor based upon your scfms.
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Q: I am looking for a small system to replace the early Carrier-Parker stuff.
Any suggestions?
Submitted by: Ed Weber, President EMS Service Company
+ A:
A: Depending upon your application, you may want to take a look at Honeywells RapidZone at http://customer.honeywell.com/rapidzone/. Honeywell presents an economical solution, as well as many useful tools and wizards for contractors use.
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Q: Can I use a Honeywell V135 thermostatic valve on a cabinet unit heater with the T100R1004 acuator?
Submitted by: Rick Morris, Quality control/sales Allied Mechanical &Electrical
+ A:
A: Yes it can. It has a remote bulb for sensing temperature outside the cabinet.
For further information, go to the Honeywell brochure which has both listed: http://customer.honeywell.com/TechLit/pdf/63-0000s/63-8702.pdf
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Q: trouble shooting t 5000-4 controlers
johnson controls
Submitted by: joe warrow, boiler operator oakwood health services
+ A:
A: I have no reference for this part number. Could it be T-5800-4? Call us to discuss - 800-227-9800.
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Q: I NEED A SUGGESTION ON SETTING UP A VELOCITY CONTROLLER FOR A DUAL DUCT A/C SYSTEM. NEED A SIMPLE SYSTEMATIC APPROCH. THANK YOU.
Submitted by: Jesse Serrano, HVAC MECH HOSPITAL
+ A:
A: In dual duct systems, 2 velocity controllers are required: 1 for the hot deck and 1 for the cold deck. The velocity controller on the hot deck should be set up with ZERO as a minimum ventilation setting, and a normal maximum flow setting. The cold deck should be set up with whatever the minimum ventilation requirement for the space is for a minimum setting, and a normal maximum setting. This approach keeps the space from overheating, while supplying minimum ventilation for comfort and health. If you have further questions call us at 800-227-9800.
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Q: I am currently working on a job involving running new pneumatic tubing from siemens 192-202 tstats to Carnes VAV NO boxes with roberbertshaw actuators 8-13 psi range. I have several stats also controlling some siemens pneumatic valves, 1", 3-8 psi range. I plan to run 5/32" twinned tubing from the vav box to the stat, and tapping off the main air line at the box with 1/4" tubing and making all terminations at the box. I also plan to run 1/4" tubing from the vav box to the valve actuator on the selected boxes.
My question is, Is the 5/32" pneumatic tubing sufficiently sized for the application.
Submitted by: Scott Deans, HVAC Tech. Controlled Air.
+ A:
A: The line from the thermostat should go to the T port on a volume reset controller. The branch or B port on the volume rest controller should go to the actuator. Main air should be connected to both the thermostat and the volume rest controller. The box should have static pressure pick-ups that should be connected to the high and low pressure ports on the volume reset controller. As to the size of the tubing, 1/4" should suffice for all. Call us to help you through the appliaction if you are not sure.
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Q: We are a real estate investment group and we are looking at several buildings which are heated with hot water radiators.
I know that in Europe there are valves available that can be put on the individual radiators that measure how much heating is being used through the radiator thereby calculating what the renters share should be of the heating bill. Any suggestions would be helpful.
The same for mini inline gasmeters on in house gas lines that feed stoves, h2o hot water heaters and gas forced air furnices.
Thanking you in advance
Ton van Dijk
(412) 833-5850
Submitted by: Ton van Dijk, President Sierra Real Estate Trust Corp
+ A:
A: We represent Istec Flow Metering devices. Give us a call about your specific application and we can put together a solution for you.
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Q: Where can we get variable speed controller for fan motors
Submitted by: boulayr, hvac/r mech. Phoenixville School Dist.
+ A:
A: We sell variable speed controllers for fan motors, as well as variable speed drives for larger applications. Consult with your NECC sales representative to find out more.
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Q: I am looking for a direction sheet to use with the Siemin's program to calibrate VAV's
Submitted by: Kay Stevens, tester/balancer ITB
+ A:
A: Consult your local Siemens branch office.
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Q: I work a lot with johnson control pnumatic thermostats. The kind with the dual dial. Some thermostats say heating and cooling. The other thermostats say day/ night. What is the cooling/ heating on the day/ night thermostats (the cooling setpoint is always to be higher than the heating. What is the cooling and heating on the day and night thermostat. (Is the day dial cooling or heating? Thankyou very much for your help!!!
Submitted by: steve , building maintenance dc maintenance
+ A:
A: Pneumatic day/night and cooling/heating thermostats have very different functions. Day/night thermostats are used to maintain a specific setpoint for daytime, and a different setpoint for night time. Cooling/heating thermostats are used to manage setpoints pertaining to different modes of operation, usually based upon seasonal environmental changes. Both types of thermostats have two bimetallic elements mounted on one chassis, with an internal switching relay that decides, via supply air pressure, which bimetal to control with. The standard Johnson Controls changeover pressures are 15 and 20 psi. Depending on the particular model thermostat you employ, at 15 psi supply pressure all of the control is left to one of the bimetals, at 20 psi supply pressure the other bimetal is given the control. Each of the bimetals operates as a separate thermostat; as such, they each require their own calibration at their specific supply pressure. Consult the specifications for the specific model you have to determine which bimetal is which.
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Q: when i am calibrating a pneumatic t stat with a day time pressure of 15 that is controling a valve with a mi spring pressere of 8 i take the temp of the room put the dial to that temp and ajust the pressure to 7to 8 ,now my question is when i am calabratig the night time side of the t stat the pressure is 20 do i now adjust it to 10 instead of 8 because i have 20 operating pressure OR JUST KEEP IT AT 8 BECAUSE THATS WHAT THE MID SPING PRESSURE IS. THANKS
Submitted by: JAMES PODGORSKI, HVAC MECH D155
+ A:
A: Mid-spring is usually the ideal calibration pressure for a pneumatic controller. Whether you are calibrating at day or night pressure, use mid-spring as your pressure. Supply pressure is merely a way to tell the thermostat which setpoint to use, the day or the night setpoint.
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Q: I am installing a Nortec Resdelux Steam Humidifier on a HVAC using a Carrier 58MVP furnace. The controls needed are: In-duct humidistat and high limit humidistat, ie. Barber Coleman HC201. Can you recommend alternate humidistats for this use?
Do you know which contacts on the Carrier 58MVP control board to connect to so when there is a call for humidity, the fan is turned on?
See Resdelux manual: http://axairnortec.humidity.com/data/docs/15016/03-58(1).pdf
Thank you,
To Lee
Submitted by: To Lee
+ A:
A: We are not familiar with the Carrier 58MVP control board, but we do sell Invensy (Barber-Colman) humidistats, as well as many other competing brands. Call us to discuss your application.
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Q: safty valve is discharging as soon as compressor comes on there doesn't seem to be any obstruction in the line between compressor and ai tank, check valve is good.
Submitted by: James Schanne, chief engineer 1515 market street
+ A:
A: Replace the safety valve.
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Q: Hello...
I just replaced a Johnson Controls T4002 DA pneumatic thermostat because it was constantly leaking air very loudly. Now, the new stat in this location does the same thing, while the one I took off is working properly in another location. What is likely the cause of this? Thank you.
Submitted by: Andy Sveen, Service manager Atlas Heating
+ A:
A: The first thing to check is your main air pressure. Make sure that the main air pressure is within the prescirbed limits of the thermostat. Next, be sure that your connections to the thermostat are correct and that the airheads are installed correctly, so that there is no leakage at the point of conncection. Finally, check the calibration of the thermostat.
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Q: I am searching for replacement boards R81EAA-2 for M130 eca JOHNSON ECONOMIZER MOTORS. IF NONE ARE AVAILABLE WHAT AFTERMARKET PRODUCTS ARE AVAILABLE WITHOUT DOING A COMPLETE RETROFIT OF SENSORS
Submitted by: JUD CARPENTER U S POSTAL SERVICE
+ A:
A: The economizer board that you reference is still available. You can select it from the parts search area of this site or call us at 800 227 9800.
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Q: Looking for procedure to calibrate A70BA-18C switch
Submitted by: Mark Bowman, Reliability Engineer GKM
+ A:
A: Go to that part number in the parts search area of this site. From there click on the link to Johnson Controls. The link will take you to the literature area of their site. From there just follow the search instructions to find what you need.
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Q: Looking for Basys Controls M/N TL1070
span: -.25 to .25
Submitted by: R Mutzabaugh, HVAC mech Pinnacle Health
+ A:
A: I show a TL1160 Differential pressure transducer with the range that you mentioned. Call us at 800 227 9800 for pricing and availability.
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Q: To your knowledge,is there a drop in replacement refrigerant for R-12.
Submitted by: Charles N. Watkins, HVAC Technician NCAT State University
+ A:
A: There is a product called "Freeze Zone RB-276" that is supposed to be a drop-in replacement for R-12. As a controls distributor, though, we have no direct experience with its use, nor can we recommend it.
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Q: When calibrating a dual band pneumatic thermostat should there be a deadband and is there any resourse online for the procedure?
Submitted by: Jackie Squires, Manager Test and balance services Salus Inc
+ A:
A: By dual band, I presume you mean a dual pressure thermostat, probably heat/cool. The dead band is identified by the use of separate setpoints for heating and for cooling. Depending upon the environement, you might select a heating setpoint of 71 degrees F and a cooling setpoint of 74 degrees F. The resulting dead band is 3 degrees F. Calibration procedures for these thermostats are readilly available on-line from their manufacturers. Follow the manufacturers links on this site to find the literature you require.
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Q: I have a powers 200 series receiver controller I would like some info on checkout and setup of this controller
Submitted by: Ed Schwab, Owner Schwab Electric
+ A:
A: Give us a call at 800-227-9800. Let us know the specific model number that you are working with and we will be happy to help you.
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Q: I am pulling out the rest of my hair trying to find a pneumatic control supply leak in a multi-story 55K sq. ft. building. The line is dual pressure and requires 18 psi to function corectly in the winter or direct acting mode. It supplies 183 theromstats and I have the regulator dialed up to 25 psi to get some but not all of the thermostats working. I cannot hear the source of the leak. I could use some tips or methods on how to locate this leak. I would Greatly appreciate any suggestions. Thank you!
Submitted by: Rich Batka, Building Engineer Holy Cross Hospital
+ A:
A: There are several methods of leak detection, some more reliable than others. The most effective is to employ an ultrasonic tester. Walk the air system with the device. It will indicate where your problems are. The next method is not as exact. Use some aromatic essence, maybe citrus or peppermint extract. Forewarn the people occupying the space. Tell them that you are searching for the scent and to tell you if they pick it up. Place just a drop or so in to the air stream. After that the hunt is on. If you still have problems, call us at 800-227-9800.
Once you are done, you may want to consider installing pressure reducing stations on a zone by zone basis throughout the building. Each pr station would be responsible for regulating the main air supply to the controls in a particular zone. Once the zones are created, it should be easier finding leaks in the future. Also, install gauges at reasnalbe intervals throughout the system. The gauges will help you identify problem areas.
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Q: I have a honeywell t-stat {the round}but I have no instalation instructions on installing how do I start?
Submitted by: Mark Ritter, HVAC helper Dykes Plumbing,Heating,Air Con.
+ A:
A: Go to our factory links page and follow the link to Honeywell. You will find all the literature you need.
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Q: I need a schematic diagram for g60pak-1 johnson cotrol. I try to replace it with s8610u honeywell control.Thanks.
Submitted by: george tech, eng. armato pro video
+ A:
A: Go to our factory links page and follow the link to Johnson Controls. You will find all the literature you need.
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Q: I need a schematic diagram for g60pak-1 johnson cotrol. I try to replace it with s8610u honeywell control.Thanks.
Submitted by: george tech, eng. armato pro video
+ A:
A: Go to the factory links page on this site and follow the link to Johnson Controls. You will find all of the literature you need.
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Q: Hi! I have an old Honeywell Thermostat from 1952. Part # TM11A2X91A1 with same #on Base? Can you tell me which number mechanical Thermostat from Honeywell I would use to replace and update this Antique. Furnace is oil fired forced hot air, no a/c, there are 3 wires at old stat now, R W B. Tested voltage is 24.7
Submitted by: Ian Anderson, Homeowner
+ A:
A: My suggestion to you is to upgrade to a digital programmable thermostat from Honeywell. Check out the VisionPro thermostat on our home page. It is our featured item. Why replace an antique with an antique. If you are going to the trouble to replace the stat, maximize your benefit with a device that is extremely energy efficient!
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Q: I have a large panel that has several receiver/controllers on it and interacting together. Iam having trouble finding info on setting this panel up correctly. Any information on where I can get training or books that would educate me on how to set these up would be apriciated.
Submitted by: Gregory Wert, HVAC Mechanic I.U.P.U.I.
+ A:
A: Call us with regard to the training. We will be happy to help you. When you call, let us know which manufacturers receiver controllers are in the panel. Additionally, try to get hold of the control drawings for the building. They should contain the squence of operation as prescribed by the whoever designed the system. 800-227-9800.
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Q: how does a pilot positioner
Submitted by: robert tirado, student nyc tech. college
+ A:
A: Through the use of a mechanical linkage, a pilot positioner senses the position of the controlled device and adds additional pressure to the actuator, up to main air pressure, to ensure the correct position relative to the control signal transmitted from the controller.
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Q: Need info on Upload and Download from
a Johnson Controls DX9100
How do I do that (have all the correct
software)
Submitted by: Scott Mortensen, Technician Controlled Temp.
+ A:
A: Go to the factory links page on this web site and follow the link to Johnson Controls. You will find all of the literature you need.
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Q: We have a power process control series 200 and I found it to be difficult to get the pilot valve restrictor even with the company who makes it.Can you tell me if your co.carry this retrictor? If you have it please let me know.thanks.
Submitted by: jose padilla, watch eng. starwood
+ A:
A: We do have access to parts for the Series 200 Controllers which were obsoleted by Powers Process Controls a few years ago. Please call us with the part number from your controller and we will be able to find you what you need. Our number is 800-227-9800.
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Q: we use power process controllers for hot water heaters.the pilot valve seems to act as a restrictor.is there is a way to clean or replace it when is damaged or clogged?can you be able to sell or indicate how to get or clean this restrictors?
Submitted by: padilla,jose, watch eng. starwood
+ A:
A: There are maintenance methods for Powers Process systems. To be sure of what you are looking at, we need more information from you. Please call us at 800-227-9800.
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Q: Need round single blade extruded aluminum manual volume dampers. We have contacted at least a dozen vendors with no success. Is this product available anywhere?
Submitted by: Bill Musacchio, Project Manager South Seminole Sheet Metal
+ A:
A: We can obtain a quote for you. Let us know the size, and the type of seals you need.
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Q: What pressure should a building operate at relative to the outside???
Submitted by: Bob WAGNER, Principal MEP Solutions, Inc
+ A:
A: Building pressurization and ventilation are important aspects
of airflow control. A building or areas within a building can be
pressurized for positive, negative, or sometimes neutral static
pressure to control the flow of air from one area to another. A
building can use positive static pressure to eliminate infiltration
drafts, possible dirt, and contamination from outside sources.
Areas within a building such as laboratories can use negative
pressure to prevent contamination and exfiltration to adjacent
spaces and zones. Proper building pressurization must also
consider the effects of outdoor wind pressure and stack effect
or vertical air differences.
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Q: Where can I get a copy of Hot Water and Steam Source Book for Hvac.
Submitted by: Claude Sessoms, Sheet Metal Mechanic Fidelitiy Engineering
+ A:
A: The book you mention was actually one of our product catalogs, circa 1997. It is no longer in print.
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Q: I need to learn how to troubleshoot
pneumatics...what can I do or go /.
Submitted by: robert tirado, watch engineer cbs ny
+ A:
A: The best place to learn pneumatic controls troubleshooting is in one of our Pneumatic Control Fundamentals seminars. Watch the training area of our site for our course schedule. Any of these courses can be brought to your location. Call Mark at 800-227-9800 for details.
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Q: Is there a place to retrieve flow patterns of various manufactures valves? Do they follow manfacturing guidelines on labeling their ports?
Submitted by: David Watson Peterson Service Co.
+ A:
A: The best way to view various manufacturers valve flow patterns is to go their respective web sites and look for the technical data you need. As to port labeling, it is best to review the documentation to insure that your requirement is met by the valve you order. At neccdelivers.com you will find links to many manufacturers sites for your convenience. In the parts search area, click on the brand to transfer to that manufacturers site.
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Q: What does a restrictor do?
Submitted by: William Ortiz, HVAC TECHNICIAN ST JOSEPH HOSPITAL
+ A:
A: A restrictor is a pneumatic device that reduces the volume of air going through a line without reducing the pressure in the line. It is used in conjunction with pneumatic controls to allow the devices to operate smoothly and efficiently. A one pipe thermostat has no internal restrictor, as is the case with two pipe devices. As result, the use of an external restrictor is required to operate the one pipe thermostat. This is also the case with pneumatic transmitters. Pneumatic transmitters are all one pipe devices, requiring the use of a restrictor.
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Q: I need to get a superheat charging chart for R-22 refrigerant. It is almost impossible to find one here locally in San Antonio please advise.
Thank You Rick Luna
Submitted by: Rick Luna, HVAC Serviceman Northside I.S.D.
+ A:
A: To obtain the correct superheat charging chart, it is always best to refer back to the manufacturer of the unit to insure that the proper chart is used. The manufacturer, or their sales representative, should be able to stear you in the right direction.
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Q: I am looking for a pneumatic relay that will switch on a very low pilot pressure like 2" to 10" perhaps. I would also like to purchase a few air pressure gauges like they used to use to indicate plugged filter banks that would turn from green to red. Are they still available?
Submitted by: David Mattson, Energy Management Coordinator Shawnee Mission Medical Center
+ A:
A: The indicators that you are looking for are still available. They come in a few varieties. Our part numbers begin with PI15. You can put that partial part number in to our parts search area to scroll the available types. As far as the relay, give us a call at 800-227-9800 to discuss the application.
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Q: Is there an electronic retrofit linkage available for the Powers 657-7680 Model 3D11 1/2" globe valves? They are approx 30 years old.
Submitted by: Kent Flowers, President Shasta Control Company
+ A:
A: Siemens has recently introduced a series of universal retrofit kits, allowing the use of their Flowrite valve actuators to operate many older, obsolete Siemens valve bodies, as well as many 3rd party manufactured valves. The kits address Siemens 658 and 591 series valves, as well as many Honeywell, Johnson Control and Invensys valves. However, the 657 series is altogether different. Given the age of the valve, it may be prudent to suggest complete replacement. My suggestion for replacement would be a Siemens valve # 599-01137, 3 way mixing with a cv of 4, coupled with an SSB81U for floating control, or an SSB61U for 0-10Vdc proportional control.
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Q: How do you calculate span for setting controllersex 4-20ma vs 20F to 120F range set point needs to 65F
Submitted by: Dan Reagan, Electrical supervisor Technical Construction Services Inc
+ A:
A: If a transmitter has an output of 4-20ma over a range of 20F to 120F, the span of that transmitter is 16 ma and/or 100F. The sensitivity of the transmitter is equal to the total output (4-20ma) divided by the span in temperature(20 to 120). 16/100 = .16ma of output change per degree of change. Therefore, at 65F my transmitter signal shoud be 11.2ma.
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Q: Do you know of another control system that duplicates the function of the Maxitrol system?
Submitted by: Scott Payne, Product Engineer/R & D Bananza Air Manangement Systems
+ A:
A: Dependent upon the application, Maxitrol has many competitors; Magnatrol and ITT General to name a couple.
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Q: pneumatic control loop training set with
transmitter,control valve,controller with instructions and manual manufactured or distributed in India.
Submitted by: beena joy, pneumatic control loop set Nagman Industries
+ A:
A: I believe your best route is t build this yourself. Select the components you would like to highlight during training and use peg board to mount the devices in a concise, accessible manner. As I have said before, I like using individual components rather than pre-arranged training boards. That way the trainees have the opportunity to construct the control loop themselves. As far as documentation, there are many good resources for pneumatic fundamental training. I sugggest starting with Robertshaws "Fundamentals of Pneumatic Controls" book. Our part number for the book is RPC-FUND.
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Q: If I have a three inch chill water line with average 80 psi that feeds a hvac unit.
What type valve with a electric actuator thats compatible for xl500 honeywell control module
woul;d stop water bleed-by while valve is closed.Oh! and the less room it takes up the better.
Submitted by: L.rigdon, enfgineer frb
+ A:
A: I would suggest a Siemens valve and electronic-hydraulic actuator in order to achieve the desired close off. Your problem may be the space available for installation. Call us at 800 227 9800 to go over the application.
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Q: I am using Honeywell excel care 2.02, I tried to install care on a second computer and missed a step during the software key export function, I am stuck in limbo with neither application working, I seem to have lost some of the information necessary to complete the transaction, is there a way to recover on the original computer or do I have to reregister the software?
Submitted by: Stan Hohman, Electronic Tech Federal Emergency Managment Agency
+ A:
A: Since CARE is a licensed software it is necessary to direct your question to the Honeywell Authorized Systems Distributor who sold you the software or to the Honeywell technical assistance center. The procedure guidelines are also contained in your CARE Users Guide.
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Q: Is Pneu Flush safe to use in hospitals to clean lines that enter ERs etc.?
+ A:
A: Thank you for your question regarding Pneu-Flush. We do recommend that
Pnue-Flush
maybe used in occupied areas, schools, hospitals, nursing homes, etc.
the product is
based on a solvent developed by Du-Pont as a HFC based solvent
replacement for
DuPonts Freon TF and Allied Signals Genesolv D.
DuPonts testing determined that the highest concentrations of the
solvent detected during
usage trials was 345.1 ppm. All concentrations above 100 ppm were from
samples taken
where the stream of air containing the solvent entered the room.
All samples taken at distances away from the exit stream were below 90
ppm.
Doors and windows were closed during the test, as a precaution it is
recommended that
doors should be opened during cleaning to inhibit the possibility of any
potential
concentration of solvent.
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Q: I have 4 different brands of thermostats
in my building, is it feasible to run all them on 1 air pressure setting?? or do I need to stanardize my thermostats
thank you Mark
Submitted by: Mark Schlesser, Dir of Maintenance Gehlen Catholic Schools
+ A:
A: It is feasible for all of them to run at the same supply pressure, so long as they are not dual pressure thermostats. Dual pressure thermostats are designed to work at two different supply pressures, allowing the thermostat to manage day/night, summer/winter and heat/cool functions. Each manufacturer uses different changeover and operating pressures to accomplish this. For that reason it is good practice to standardize when using dual pressure thermostats.
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Q: What's the best way to test:
FreezeStats?????
Submitted by: Bob Wagner, Project Manager Sebesta Blomberg
+ A:
A: You must either simulate the condition that you want the stat to trip at, or calibrate the freezestat to trip at a condition you can simulate for testing.
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Q: I can't get enough cfm out of a end of the run vav box. I have done extensive work to correct the problem. My question is this. on our blue prints, the airhandlers static pressures our anywhere from 4.0 to 4.3 . The building is 19 years old, and since as far back as I have found, our S.P. controllers have been set at an average of 1.0. What do I do??
Submitted by: Scott Barlow, Mechanic RMH
+ A:
A: This is a common problem in VAV systems. Unfortunately there is no easy answer. VAV systems are like a big apple pie that everyone is supposed to get a piece of. If someone at the front of the line takes two pieces, someone at the back wont get any. First I would check the set up of each box in the line, from front to back. Each box should be set up to provide the required amount of ventillation in cfm per head, based upon occupancy of that space, and the ASHRAE standard. Once this is verified, make sure the thermostats are calibrated correctly. From the thermostats, go to the equipment to insure that it is running up to capacity. Check the ductwork for anything that may inhibit flow. Beyond that, give us a call.
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Q: do you have a belimo actuator ( non hydraulic) that will replace a siebe ms-83013. What a mess when the fluid spills.
Submitted by: jud carpenter, bem us postal service
+ A:
A: Dependent upon your application you can use a direct coupled actuator. The MS-83013 produced 150 in. lbs. of torque and spring return. You need to find an actuator that provides the required torque for your application, as well as fail safe operation. Give us a call and well help you identify what you need.
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Q: Hello!
I need to save Energy for a Mall, Where can I find information for this??
Thank's.
Submitted by: Arturo Lozano, Engineer SAEG
+ A:
A: There are many aspects to saving energy. A good place to start is evaluating the capacity and efficiency of your equipment (see HVAC Service Assistant from Honeywell). From there you need to evaluate your control scheme. Is it designed to maximize equipment performance and comfort? If you need help, call 800-227-9800.
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Q: How to specify cooling tower optimiation
Submitted by: HL, Manager JCI
+ A:
A: You may want to check with the Johnson Controls Institute for their HVAC Mechancal Systems course # 210 and HVAC Maintenace course # 220. Particicpation in these courses will certainly help you. You do need to be a certified engineer to do any actual specifying. An engineers stamp ensures the validity of your drawings and specifications.
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Q: I`ve got a time delay relay that needs replacing. It is made by National Control Corp. the Model Number is TIK-300-461. Range is 3-300 sec and 120v coil. Can you help me match it up to one from your site or perhaps you have a local distrubutor in my area. I`m located in Mokena, IL (Chicago, IL area). Let me know thanks!
Tino
Submitted by: Tino Jimenez Jr., Account Executive A.M.C. Mechanical, Inc.
+ A:
A: The T1K-00300-461 is available from National Controls Corporation. Call us at 800-227-9800 for pricing.
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Q: Can you recommend a Steam Flowmeter to be mounted in steam header size of 12" dia. with a capacity of 66,000 lbs/hour at 125 psig operating pressure?
We rquest a digital read-out for steam flowrate and temeprature reading with memory builtin for monitoring purpose.
Submitted by: Jojie Jimenez Apolinario, Senior Engineer Al-Mutlaq Services Co., Ltd.
+ A:
A: Our offering comes from Istec Vortex Steam Flow Meters. Using a 12 inch meter, coupled with a mass flow computer giving you compensated rate, total, temperature and memory. Call us, or email for a quote.
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Q: In the authority calculation of a receiver controller some manufacturers dont include the throttling range in the calculation. Even on your pneumatic calibration card you show the formula with it included but in the actual calculation you leave it out. Honeywell uses it in their calculation and Johnson Controls which uses ratio doesnt include it either. You read some manufacturers literature that does include it and same manufacturer has other literature that doesnt include it. Thank you.
Submitted by: Thomas McHugh, HVAC Service Pipefitter Reliance Mechanical Corporation
+ A:
A: You are absolutely right. The throttling range needs to be included in the calculation. Thanks.
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Q: Retro fit a Fireye E110 to Fireye 26R28 M#CB1A.I HAVE NO DRAWINGS OF THE CLEVER BROOKS.On my best guess the controll comes up open on MD.Would it be posiable to aqurie this material
Submitted by: Jeffery L Ritter, HVAC/R service ritters hvac
+ A:
A: As near as I can ascertain you are looking at a 26RJ8-CB1. Doublecheck the numbers to be sure. The prescribed modernization kit for this is a plug in assembly that facilitates replacement of the older model with a new Flame Monitor system. The kit retains the same functions as the old control but provides the operator with a diagnostic and intelligent microprocessor based Burner Management System that can communicate historical and current information to a local or remote site. Call us at 800 227 9800 for more information.
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Q: I am an hvac instructor about to set up a basic pneumatics lab. I was considering Johnsons Newmatic controls since they are modular. What sort of pneumatics training boards do you use?
Submitted by: Norm Christopherson, HVAC instructor Local 66 Sheet Metal Apprenticeship Center
+ A:
A: I do not use boards in the training that I do. Prepiped boards are ok for demonstration purposes but I find that attendees get more out of piping the controls themselves. I use loose components allowing students to build the system from simple to complex. I pipe up the room supplying main air to each of the training tables. Each table is a two person training station.
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Q: I am looking for calibration instructions for the Barber Colman pneumatic thermostats
Submitted by: Jamie Dickison, Facilities Manager Lowe Enterprises
+ A:
A: 1. Remove the thermostat cover.
2. Using a 5/64 inch Allen wrench, unscrew the testpoint screw one full turn.
2. Attach the test gauge rubber seal to the boss. Using a rotary motion, push the gauge on as far as it will go.
4. Adjust the setpoint dial to the room temperature, as indicated by a reliable thermometer.
5. Provide a pressure to the rest input which is the proper value for the temperature being measured. Example: For a rest of 65 to 75 degrees with a rest pressure of o to 20 psi, having a measured temperature in step 4 of 68 degrees would mean the reset pressure should be T of 3 degrees (65 to 68) times psi/degrees [20(0 to 20) = 10 (total reset 65 to 75)] of 2 to 6 psi above lower input level of 0 psi or in this example 6 psi.
6. With a .048 inch six spline wrench, turn the calibration screw until the controlled pressure is 8 psi.
7. If the temperature in steps 4 through 6 is not the normal anticipated setpoint, and it is desired to change the setpoint to another value, this can be done as long as the reset pressure is also adjusted to the propoer value for that setpoint per the reset schedule.
8. Disconnect the test gauge, close the branch test port and replace the cover.
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Q: how often should you replace the restrictionplate on the back of apowers thermostat. how iften does a thermostat go bad, and due they make a repair kit for the Siemens powers thermostat #192 202
+ A:
A: The restriction plate on the back of the 192 S series Powers thermostats should not have to be replaced if the supply air is kept clean, dry and oil free. The same applies to the thermostat. If the instrumnet is exposed, however, to contaminated air the internal orafices may become clogged. Siemens does not market a repair kit, but they can be rebuilt. Call us at 800-227-9800 to get a price on rebuilding your thermostats.
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Q: Looking for informaiton on Andover Control systems.
+ A:
A: We do not market Andover Controls. They can be found on the internet at www.andovercontrols.com.
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Q: how to connect a time delay with a relay output?
+ A:
A: There are two basic types of time delay relays: delay on make and delay on break. The delay on make timers are used for staging and to reduce power surges in mutliple compressor applications. Delay on break timers protect equipment from damage caused by rapid short cycling. The time delay in both types may be fixed or adjustable. To wire in the relay follow these steps: Disconnect power, connect terminals in series with the starting device or contactor, adjust the time delay, reconnect power, check operation.
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Q: lookig for a low voltage thermostat that operates on 4 to 20 ma with 24vac power and has digital read out for temp and set point adjustment
+ A:
A: Erie Controls makes one. It is designed to provide control for fan coil units, air handling units, heat pumps and terminal units. The control signal is selectable: 0-10 Vdc or 4-20 mA. Call us at 800-227-9800 to find out more.
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Q: I would like to know if it posible to make my pneumatic receivers be control diferetly, now all five controlers are working together so the hole duuilding is the same temp what ever the ac unit cold water suply temp is, is what all the units temp all all the same
+ A:
A: Each one of your receiver controllers can be set up to any 3 to 15 psi output that you need, based upon a sensed condition sent to it by the its transmitters. All that you need to do is calibrate and set up each one to provide the comfort level desired.
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Q: On the old honeywell brass receiver controllers, the restrictors were part of the inputs. I have installed a BAS but want to keep the existing panel gauges. Do you know if honeywell uses a .005 or a .007 for there sensors and gauges? I plan to just have the main feed the existing sensor and gauge but need to know what type of restrictor to use. Thanks for your help.
+ A:
A: The resritors you use should match the orafice of the transmitter. If you are not sure what that is start small and work up. Try the smaller restrictor first. If the control reacts quickly enough leave it alone. If the control seems sluggish move to the larger restrictor.
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Q: Would like to know if you have a repair kit for a Powers 1950001rc195 receiver controller.
+ A:
A: There are three kits available. 195-066 receiver-controller restriction kit includes three input restriction plates, one pilot relay restriction plate, gaskets, and two screws. 195-067 is the replacement pipehead for multiple input models. 195-114 is the replacement pipehead for single input.
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Q: We have a plastic bottle blowmolding operation using a 30kg/cm2 (450psi) compressor and a large holding tank. Our current pressure switch only allows the pressure to be controlled within 5 kg (70 psi) of pressure. This big swing in pressure results in very uneven results in our bottles. Could you recommend a more accurate pressure switch or a way to control the air pressure more tightly? Ideally, we would like to control the pressure to within 15 - 30 psi.
Thanks. Paul Rasch
+ A:
A: We suggest installing a secondary pressure regulator on the compressed air line coming from the compressor. Our part # PPR114 will regulate the pressure, after the primary regulator, down to as low as 0.1 psi and up to 60 psi. Install gauge # PG24B100 on to the PPR114 to indicate your output pressure.
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Q: Info on Barber Colman TK 6024 pneumatic thermostat
+ A:
A: The T-6024 is a direct acting remote bulb pneumatic controller, used to provide proportional control in commercial HVAC systems. It has an adjustable throttling range of 3 to 35 degrees F at 10 psi (factory set at 5 degrees). For more detailed information call us at (800) 227-9800.
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Q: pid control
+ A:
A: Proportional plus Integral plus Derivative (PID)control is a system which directs control loops to look at how far away an input is from setpoint, how long it has been at setpoint and how fast it is approaching/moving away from setpoint.
|
Q: data sheet for johnson controls C 5230
+ A:
A: Call us at (800) 227-9800. We will be happy to send the spec sheets to you.
|
Q: what would cause an air handler to run continuously?
+ A:
A: Lack of control. Airhandlers usually provide a specific amount of ventillation to the supply and return systems in a building, based upon demand identified in the specifications for the particular building. It could be a constant or intermittent demand dependent upon the design.
|
Q: what does reset mean in a control loop
+ A:
A: Usually, reset means a change in setpoint based upon a secondary condition. For example, in the northeastern part of the U.S. I can satisfy a buildings heat load by providing hot water supply temperature of 200 degrees F when it is 10 degrees outside. However, when the outdoor temperature is 70 degrees F I can satisfy the heat load with 100 degree F hot water supply. Therefore, using a multiple input receiver-controller, an outdoor air transmitter, and a hot water supply transmitter, I can build a reset schedule strategy for that control loop to automatically adjust my setpoint for hot water supply temperature based upon outdoor air temperature.
|
Q: reciever controller calculations
+ A:
A: Proportional band: Desired throttling range(degrees F or C)/Controlling transmitter span X 5 psi/spring range X 100.
Authority: Change in pressure at Port#1 + (Throttling range x sensitivity of primary transmitter)/ Change in pressure at Port # 3 X 100.
|
Q: how do you use proportional band calculator
+ A:
A: Call us at (800)227-9800. We will walk you through the instructions on the calculator.
|
Q: how do you use proportional band calculator
+ A:
A: The proportional band calculator that we distribute has directions printed on it. Just follow the numbered steps. If you are still not sure feel free to call us at 800 227 9800 and we will talk you through it.
|
Q: is there a technical standard which defines the minimal quality for instrumentation compressed air
+ A:
A: The standard is simply this: clean, dry, oil free air. ATC air stations should start with a climate control compressor. These compressors are specially designed to run at a lower rpm than standard compressors, thereby throwing less oil. After the compressor, a series of pop safety valves, pre-filters, coalescing filters, drains and air driers are employed to help reduce the amount of contaminants in the air before it reaches the controls. Consistent maintenance is a must at the air station, and often overlooked. Most problems with pneumatic controls systems start with lack of maintenance at the air station. For a suggested maintenance schedule refer to page 123 in our catalog, the HVAC Guidebook. If you do not have our book, call us at (800) 227-9800. We will be happy to send you one.
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Q: flushing oil out of a pneumatic control air system in a 15 story with over 1500 vav boxes.
+ A:
A: Most contamination problems in pneumatic air systems originate at the air station. As result, flushing the lines within 500 feet of the air station will usually do the trick. Pneu-Flush is a non cfc solvent that direcly injects into the main air lines. The solvent vaporizes the sludge and contaminants, which are propelled by the supply air, leaving the system through the controls. This product is safe for use with most pneumatic controls in use today. For more specific information on Pneu-Flush call us at (800) 227-9800.
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Q: How do you keep a camputer lab cool with thirty plus computers
in it?
+ A:
A: The most important thing you need to insure is that your equipment is sized properly for the load. I consider each pc to be a heater. They throw off as much heat as a small electric unit heater and, as such, should be considered when doing your cooling load calculation. If that was not done before the installation, you will need to upsize your equipment or use auxillary cooling units to handle the load.
|
Q: Training
+ A:
A: Check the Whats New page of this web site for the most recent NECC training schedule. All of the courses found there are presented within close proximity to our office in southeastern Pennsylvania, but can be presented at your company, or facility. Call NECC at 800-227-9800 for more information about bringing training to your location.
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Q: looking for a pneumatic pressure to temperature conversion table to use in conjunction with a siebe RKSR-4000 universal pneumatic receiver controller, any suggestions would be helpful, thankyou.
John Williams, Jr.
gyhooyabat@aol.com
+ A:
A: We have one! Call us at (800) 227-9800. We will be happy to send it to you.
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Q: how do you determine mid spring?
+ A:
A: If you have a device with a 3-8# spring: add 3 + 8 and divide by 2 (5.5# is mid-spring.
If you have multiple springs: 3-8#, 5-10# and 10-15#, add the lowest number (3) and the highest number (15) and divide by 2 (9# is mid-spring).
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Q: Do you carry a pneumatic PRV(pressure reducing valve)with a filter? If so can I get a price from you please.
+ A:
A: Yes we do. Our part #CFR114 is a combination filter and regulator. Trade price is $40.80.
|
Q: how to trouble shoot a receiver control
+ A:
A: To effectively check out a receiver controller, you need to know what information is being sent to it by the transmitter(s) and what you want the device to do with the information. First, check out the primary transmitter. If it is a temperature transmitter, measure the temperature being sensed with a calibrated thermometer. Convert that temperature into the corresponding psi for that particular transmitter. If you do not know how to do that, give us a call. Once you know what the transmitter output signal should be, tee a gauge in to the line between the transmitter and the receiver controller to insure that the transmitter is working properly. If it is, the signal should be the same as your calculation. If using a secondary transmitter, repeat the process to check it. Next check the supply air going to the receiver controller by teeing a gauge in to the supply line. Once you have proved that you have good supply pressure, go to the branch line coming off the receiver controller to check the output signal. It should correspond to the pressure that the receiver controller is calibrated to send based upon the condition of the primary and secondary temperature(s) sensed. If it does not, the receiver controller must be recalibrated. Use the factory calibration instructions to properly set up the receiver controller.
|
Q: WHEN I ORDER BY CREDIT CARD ON LINE, IS MY CREDIT CARD
IMFORMATION ENCRIPTED?
+ A:
Q: a varible air volume system has all new
controls the fan runs,but the throttle cylinder will not throttle. There is air to the volume controller, but no air to the throttle cylinder,and we replaced the control cylinder 4 times. the vav throttle cylinder still will not throttle. The air lines are all clear.
+ A:
A: If by throttle cylinder you mean the actuator, it could be that the diaphragm in the actuator is leaking. Replace the diaphragm.
|
Q: How do you calibrate a pneumatic thermstat?
+ A:
A: 1. Measure the temperature of the controlled medium with an accurate thermometer.
2. Adjust the setpoint to match the temperature measured in step 1.
3. Adjust the calibration screw until branch pressure measures 8 psig or mid spring range of the controlled device.
4. Adjust setpoint to desired value.
|
Q: What is authority?
+ A:
A: The adjustment on a receiver-controller which determines the effect of the reset signal from a secondary transmitter as a percentage of the primary signal from the primary transmitter.
|
Q: What is a dead band?
+ A:
A: An area around a setpoint where there is no change of state.
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Q: What is derivative control?
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A: A system that changes the output of a controller, based on how fast a variable is moving from setpoint.
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Q: What is a control loop?
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A: The strategy to make a piece of equipment operate properly. The loop receives the appropriate inputs and sets the outputs to the proper values necessary to attain the desired condition.
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Q: How do you determine the size of the compressor you need?
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A: For new installation:- Count the devices connected to the control system that consume air.
- List the model and function of each device.
- Look up the air use (in scim) in the factory manuals.
- Total the air consumption of your control system (in scim).
- Divide the scims (standard cubic feet per minute) by 1728 to determine cfm.
- Multiply the cfm by 3 (this will give you the recommended 1/3 run time needed to assure maximum life and drier supply air).
For exact replacement:- Try to find the exact model # and brand of the compressor you’re replacing.
- Determine anything special about the existing installation (voltage, accessories, special size tank piping, air station components, etc.).
MINIMUM ordering specifications:- Capacity (delivered cfm output desired).
- Size (hp of the compressor).
- Tank size (in gallons).
- Voltage and phase of the compressor motor.
- Simplex or duplex (one pump or two mounted on the tank. Duplex gives you longer life and standby capacity in the event of a pump failure).
- Type of compressor (lubricated or oil-less).
- Pre-mounted, pre-piped drier option (saves installation time).
- Any air station accessories needed (regulators, condensate drains, relief valves, oil and air filters, pressure gauges, etc.).
- Installation accessories (tank vibration pads, fittings, tubing, teflon tape, restrictors, in-line check valves, tubing tools, mounting clips, ty-wraps, spring clips, etc.).
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Q: What is the calibration pressure for pneumatic thermostats?
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A: Pneumatic thermostats transmit a control signal of 3 to 15 psi based upon a sensed temperature. In direct acting applications as the temperaturer sensed goes up the output of the thermostat goes up. Suppose we are heating a space with a small hot water valve with a 3 to 8 psi spring range. For the example our set point is 72 degrees. We will maintain comfort at 72 degrees plus or minus 2 degrees. Set the thermostat for the set point and adjust the output pressure to half of the spring range of the valve. 5.5 psi puts us right in the middle of the valve stroke. Now at 72 degrees the valve will be half open. As the space temperture drops the output of the thermostat drops opening the valve to more heat. As the space temperature rises the output of the thermostat rises closing off the hot water valve.
As a second example, the thermostat is controlling more than one device, say a direct acting hot water valve with a spring range of 3 to 8psi and a reverse acting chilled water valve with a spring range of 10 to 15psi. The total spring range of the control loop is 3psi, the start point of the h.w. valve, to 15psi, the end point of the c.w. valve. In this case the calibration pressure is at mid-range of the two devices or 9psi.
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