Instruction/ maintenance manual of the product T775A Honeywell
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PRODUCT DATA 63-2489—2 T775A,B,C,D Remote T emperature Controller APPLICATION The T775 family of Electr onic Remo te T emperatur e Controllers provide on-off temperat ure control for ducts, t anks, chillers, heating and refri geratio n units, and other application s where electronic accuracy in addition to re mote sensing is desired.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 63-2489—2 2 ORDERING INFORMATION When purchasing replacement and modernizat io n products from your TRADELINE® whol esaler or distributor , refer to the TRADELINE® Catalog or price sheets for complete ordering number .
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 3 63-2489—2 Contact Ratings: 1/2 hp; 9.8 FLA, 58.8 LRA at 120 V ac. 1/2 hp; 4.9 FLA, 29.4 LRA at 240 V ac. 125 V A pilot du ty at 120/240 V a c. 10A at 24 V ac (resistive). Approvals: Underwriters Laboratories Inc.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 63-2489—2 4 Fig. 3. Feature locations for T775 A,B. Fig. 4. Feature locations for T775 C,D. SELECT SET ENTER 12 3 4 1 2 3 4 SA SB C F SENSOR A SENSOR B TOD 24V 5 6 120V COM 240V OUTPUT 2 OUTPUT 1 OUTPUT 3 OUTPUT 4 NO COM NC NO COM NC NC COM NO M7423 F/C SELECTION DIP SWITCHES FOR SENSOR SELECTION.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 5 63-2489—2 INSTALLATION When Installing this Product... 1. Read these instructions carefully . Failure to follow them could damage the product o r cause a hazardo us condition. 2. Check ratings given in instructions and on the produ ct to ensure the product is sui table for your application.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 63-2489—2 6 Fig. 7. Senso r mounted on w all. Fig. 8. Parallel-series wiring of sensors. WIR ING CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or sh ort equipment circuitry . Disconnect power supply before installation.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 7 63-2489—2 OPERATION Control Algorithm On/Off Control The T775AC operate with one temperature input supplied by the remote sensor while T775B,D have two temperatu re inputs. The T775A,B,C,D are all capable of providi ng up to four stages of on/off control relay ou tputs.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 63-2489—2 8 2. For two sensor models (T775B), determine which loads will be controlled fro m sensor A or sensor B and enter on the worksheet. 3. Determine setpoint (Setpt) and switching differential (Diff) for each load and enter on the worksheet.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 9 63-2489—2 This selection is accomplished in the Select screen scrolling loop: 1. T o lock on to either sensor , use the Select key to scroll through the loop to the temperature prompt of interest. 2. S top at Sensor A or Sensor B sensed temperature point.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 63-2489—2 10 CHECKOUT Error Messages There are seven error messages that can display in response to T775 software or hardware problems. The error Codes that can flash on the display are: • SF: Sensor Failure — A flashing SF indicates an o ut-of-range or defective sensor .
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 11 63-2489—2 Fig. 10. Checkout T able and checkout example with Sensor A = 6 8°F and Sensor B = 73°F . SELECT ENTER SET M7426A HEA T OR COOL MODE DIFFERE.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 63-2489—2 12 Fig. 1 1. T wo-st age control, 24 V ac input, 24 V ac load. COOL MODE HEA T MODE RELA Y 1 AND 2 ENERGIZED RELA Y 1 AND 2 ENERGIZED NULL NULL R.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 13 63-2489—2 Fig. 12. T w o-stage control, 120 or 240 V ac input; 120 or 240 V ac load. BLK WHT 120 V AC LOAD 1 LOAD 2 M7422A DIFFERENTIAL 2 DIFFERENTIAL 1.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 63-2489—2 14 Fig. 13. Four stage control, 120 or 240 V ac input, 120 or 240 V ac load. HEA T MODE M7424A NULL DIFFERENTIAL 3 TEMPERA TURE RISE RELA Y 1 ,2,.
T775A,B,C,D REMOTE T EMPERATURE CONTROLLER 15 63-2489—2 Fig. 14. Four-st age control, 24 V ac input; 24 V ac load. HEA T MODE NULL DIFFERENTIAL 3 TEMPERA TURE RISE SETPOINT 3 RELA Y 1,2 AND 3 ENERGI.
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An important point after buying a device Honeywell T775A (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Honeywell T775A yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Honeywell T775A - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Honeywell T775A you will learn all the available features of the product, as well as information on its operation. The information that you get Honeywell T775A will certainly help you make a decision on the purchase.
If you already are a holder of Honeywell T775A, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell T775A.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell T775A. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell T775A along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
