APPLICATION

The C7735A1000 Duct Air Temperature Sensor (DATS) is a duct-mounted temperature probe used to sense discharge air temperature in zoning applications for high and low-temperature limit protection. Alternatively, it is used with certain thermostats for delta-T diagnostics and IAQ control. For more on these applications, please see the installation instructions for those products.

Honeywell C7735A1000 Duct Air Temperature Senso-APPLICATIONr


Fig. 1. C7735A dimensions in. (mm).

INSTALLATION

When Installing this Product...

  1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.
  2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application
  3. Installer must be a trained, experienced service technician
  4. After completing the installation, use these instructions to check out the product operation.

IMPORTANT
Do not locate the DATS probe in a duct near the heat exchanger or strip heat, which can cause false temperature readings.
It is recommended to set the high limit approx. 15°F below the furnace high limit. Some modern furnaces have low-high limit settings, so if the DATS is used with a zone panel, make sure the correct zone panel is selected for the equipment.
The HZ221 zone panel is for heat pumps only and has a fixed high limit (120°F for heat pump. 160°F for aux heat) and low limit (45°F). The HZ311 has a fixed high limit (160°F) and low limit (45°F). The HZ322 & HZ432 zone panels have an adjustable high limit (110°F-180°F) and low limit (30°F-60°F).

  1. Assemble the DATS by attaching the metal sensor probe to the plastic cap. Insert the plate of the probe into the two tabs on the inside bottom of the cap. Then rotate the plate clockwise until it clicks into the single top tab.
  2.  Locate the DATS on the supply trunk between the bypass damper and the evaporator coil and/or heat exchanger. If a bypass damper is not used, locate the DATS between the zone dampers and the evaporator coil and/or heat exchanger. See Fig. 2.
    Honeywell-QR
    Fig. 2. DATS mounting location.
  3. Drill a 1/4 in. hole in the duct at the location selected for the sensor.
  4.  Attach wire using wire nuts and push them into the cover, then insert the probe into the hole drilled in step 2.5. Secure the DATS to the side of the duct, through the two mounting holes, with the screws supplied.
  5. Secure the DATS to the side of the duct, through
    the two mounting holes, with the screws supplied.
    IMPORTANT
    Use 18-22 gauge thermostat wire for shorter runs. For longer runs or when wiring near voltage, use shielded cable.
  6.  Run a wire to zone panel or thermostat. See zone panel or thermostat installation instructions.

Table 1. DATS Resistance Cross Reference.

Temperature
(°F)
ResistanceTemperature
(°F)
ResistanceTemperature
(°F)
ResistanceTemperature
(°F)
Resistance
3233630751051411838301611582
3332668761025311937471621552
34317 37771000312036661631523
35308 3578975412135871641494
36299 6279951412235101651466
37291 1780928112334 351661438
382829881905512433621671411
392750582883512532901681385
40267 3783862112632 211691359
412599384841212731 531701334
422527285821012830861711309
432457386801312930211721285
442389687782113029581731261
452324088763413128961741238
462260489745313228361751215
472198890727613327771761193
482139091710413427 201771171
49208 1092693713526641781150
50202 4893677413626091791129
511970394661513725551801108
52191 7595646113825031811088
531866296631113924 521821069
541816597616414024021831050
551768398602214123 531841031
561721599588314223061851012
57167 61100574814322 59186994
5816320101561714422 14187977
59158 92102548814521 70188959
6015477103536314621 26189943
611507410452421472084190926
62146 8310551231482043191910
631430310650081492002192894
64139 3410748951501963193878
651357610847861511924194863
66132 2910946791521886195848
6712891110457515318 49196833
681256311144731541813197819
6912244112437415517 78198805
70119 3511342781561744199791
711163411441831571710200777
721134211540921581677
731105811640021591645
74107 8211739151601613
Honeywell C7735A1000 Duct Air Temperature Senso-Icon

www.resideo.com

Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
69-1521EFS—03 M.S. Rev. 03-20 | Printed in the United States

© 2020 Resideo Technologies, Inc. All rights reserved. The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates.

Documents / Resources

Honeywell C7735A1000 Duct Air Temperature Sensor [pdf] Installation Guide
C7735A1000, Duct Air Temperature Sensor

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