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Honeywell T775A manual

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Table of contents for the manual

  • Page 1

    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. In addition,[...]

  • Page 2

    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 . If you have additional questions, need further information, or w oul d like to comme[...]

  • Page 3

    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. Listed: File no. E4436. Canadian S tandards Assoc. certified: Fil e no. LR47125. Accessori[...]

  • Page 4

    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. PRES[...]

  • Page 5

    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. 3. Installe[...]

  • Page 6

    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. CAUTION Do not use 24 V ac powe r at terminals 5 and 6 t[...]

  • Page 7

    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. Each controller stage has its ow[...]

  • Page 8

    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. 4. Refer to the Control Algorithm subsection of Operation[...]

  • Page 9

    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. 3. When the loop is stopped at any other prompt[...]

  • Page 10

    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 . Make sure that th e sensors [...]

  • Page 11

    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 DIFFERENTIAL DESIGNA TED SENSOR SETPOINT SENSED TEMPERA TURE LOAD 1 (HEA T) LOAD 2 (HEA T) LOAD 3 (HEA T) LOAD 4 (HEA T) CLOSED OPEN ON A BAB 68 73 68 73 68 [...]

  • Page 12

    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 RELA Y 1 ENERGIZED RELA Y 1 ENERGIZED TEMPERA TURE F ALL DIFFERENTIAL 2 TEMPERA TURE F ALL DIFFERENTIAL 1 TEMPERA TURE RISE TEMPERA TURE RISE SETPOINT [...]

  • Page 13

    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 SETPOINT 2 SETPOINT 1 COOL MODE HEA T MODE TEMPERA TURE F ALL TEMPERA TURE F ALL DIFFERENTIAL 1 TEMPERA TURE RISE TEMPERA TURE RISE RELA Y 1 AND 2 EN[...]

  • Page 14

    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 ,2,3 AND 4 ENERGIZED SETPOINT 3 RELA Y 1,2 AND 3 ENERGIZED DIFFERENTIAL 4 SETPOINT 4 DIFFERENTIAL 2 SETPOINT 2 RELA Y 1 AND 2 ENERGIZED DIFFERENTIAL 1 SE[...]

  • Page 15

    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 ENERGIZED DIFFERENTIAL 2 SETPOINT 2 RELA Y 1 AND 2 ENERGIZED DIFFERENTIAL 1 SETPOINT 1 RELA Y 1 ENERGIZED TEMPERA TURE F ALL COOL MODE DIFFERENTIAL 2 TEMPER[...]

  • Page 16

    Automation and Co ntrol Solutions Honeywell Internation al Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Dri ve North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered T rademark © 2005 Honeywell International I nc. 63-2489—2 B.B. Rev . 07-05[...]