Honeywell Wall Humidity/ Temperature Sensors Installation Guide

H7725A, H7726A, H7735A,H7736A Wall Humidity/Temperature Sensors



  • Only qualified trade installers should install this product.
  • This product is not intended for life-safety applications.
  • Do not install in hazardous or classified locations.
  • The installer is responsible for all applicable codes.
  • De-energize power supply prior to installation or service.


Honeywell products are not designed for life or safety applications. Honeywell products are not intended for use in critical applications such as nuclear facilities, human implantable devices,s or life support. Honeywell is not liable, in whole or in part, for any claims or damages arising from such uses.


  1. IMPORTANT! Per Fig. 1 locate sensor in an area away from ventilation sources and heat-generating equipment and appliances. The sensor should be mounted at light switch height in a vertical orientation. Use insulating material behind the sensor to ensure reading accuracy.NOTE: Do not install sensors in multi-gang electrical boxes with line voltage or other electrical devices.
  2.  Wire sensor as shown per Fig. 2.
  3. Set the slide selector position (on the back of the device) to accommodate either 2-wire or 3-wire outputs. This selector must be ‘up’ for voltage output.
  4. To change between 0-5V and 0-10V, remove the front cover of the device and adjust the DIP 1 switch position (on front of the device). Replace cover.
  5. To install in a junction box, mount device to box using two screws. To install without junction box, rotate the top and bottom drywall clamps completely counter-clockwise. Place into drywall cutout, then turn clamp screws clockwise until they are secured tightly against the drywall. The sensor must be installed in the orientation shown.
  6. Apply power to the sensor.


Press the center MENU button to access (1 press) %RH offset mode. A red LED will blink to indicate the %RH offset setting. The down arrow and up arrow can be used to decrease or increase offset values in 0.1 increments up to ±5%.


Fig. 4. Dimensions in inches [mm].


Table 1. Troubleshooting.

Symptom Solution
No output Check to wire. Ensure power supply meets requirements.
Temp or RH reading error Verify control panel software is configured for correct output scaling.
Verify the accuracy of the test instrument. Observe installation and calibration guidelines.
Verify unit is securely installed on duct without excessive air leakage.
Offset calibration only if necessary.
Sensor damage, contamination, or long-term drift Replace sensor element. Consult the factory for ordering information.


Honeywell RH sensors are factory calibrated to NIST traceable standards. No field calibration is necessary or recommended. However, to facilitate compliance with commissioning requirements field calibration offsets are allowed.

  1. Locate calibration instrument and sensor in close proximity to each other in a controlled environment free of drafts, people, and equipment to reduce the influence on RH and temperature.
  2. Allow both readings to stabilize (10-30 minutes). Compare the reading of the sensor to the calibration instrument, and calculate the difference.
  3. Refer to the OPERATION section to change offsets as needed. Setting an offset of zero restores factory calibration.


Table 2. Models.

Product Number Humidity Accuracy Temperature Sensor
H7726A2020 2% 1097 Ohm
H7725A2010 2% 20 kOhm
H7736A2022 3% 1097 Ohm
H7735A2012 3% 20 kOhm
H7725A2010-C 2% NIST Certified 20 kOhm


Correct disposal of this product (Applicable in the European Union and other European countries with separate collection systems). This product should be disposed of, at the end of its useful life, as per applicable local laws, regulations, and procedures.


This product can expose you to chemicals including 1, 3-Butadiene, which is known to the state of California to cause cancer and reproductive harm. For more information, go to


Table 3. Specifications.

Power supply AC Supply/ DC Supply 24VAC, 100mA max. 12-30VDC, 50mA max.
Outputs RH 3-wire 0-5V/10V4,3-wire or 2-wire 4-20mA (Selectable)
Output scaling RH 0-100WoRH
Thermistor/ RTD Nominal resistance @ 25 °C 20 kOhm 1097 kOhm
Relative Humidity Accuracy 2°/o models: ±2% max 0 to 1000/o RH, ±1.5% typ 0 to 80°/o RH @25°C
3°/o models: ±3% max 0 to 100°/o RH, ±2% typ 0 to 100°/o RH @25°C
Resolution 0.01°/o RH
Hysteresis ±0.8% RH
Repeatability 0.08% RH
Non-linearity Factory linearized <1%RH
Temperature coefficient Fully compensated by on-board sensor
Response time 2 8s
Output update 0.5s
Operating range 0 to 100°/o RH (non-condensing)
Long term drift <0.25% RH per year
Operating conditions 3 41 to 140°F (5 to 60°C) @ 20-80°/o RH
Enclosure Materials ABS/Polycarbonate
Dimensions 5.66″h x 3.00″w x 0.36″d (1.69″ depth including recessed components)
Enclosure Rating IP20/NEMA 1
Unit Temp Rating -40°F to 158°F (-40 to 70°C)
  1. One side of the transformer secondary is connected to signal common. A dedicated transformer is recommended.
  2. Time for reaching 63% of reading at 25°C and 1 m/s airflow.
  3. Long-term exposures to conditions outside the normal range or high humidity may temporarily offset the RH reading (+3%RH after 60 hours).
  4. 15-30VDC/24VAC power supply voltage required for 10-volt output.

Honeywell Building TechnologiesIn the U.S.:Honeywell715 Peachtree Street NEAtlanta, GA

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