Honeywell DUCT-MOUNT AND OUTDOOR-MOUNT H7635C User's Manual

Honeywell Smoke Alarm User's Manual - DUCT-MOUNT AND OUTDOOR-MOUNT H7635C.
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INSTALLATION INSTRUCTIONS

63-2579—3

H7625B; H7635B,C; H7655B 

Duct-Mount and Outdoor-Mount 

Humidity/Temperature Sensors

APPLICATION

The H7625B, H7635B, H7655B Duct-Mount and H7635C 
Outdoor-Mount Humidity/Temperature Sensors are 
universal Relative Humidity transmitters that can be 
powered with either a +18 to 36 Vdc or 24 Vac supply. 
The sensors use a half-wave bridge rectifier to convert 
AC power to a usable DC voltage. The device also 
includes a 20K ohm temperature sensor for optional use.

The humidity sensors are designed with a field-
selectable  4 to 20  mA,  0 to 5 Vdc,  or  0 to 10 Vdc  output 
signal equivalent to 0 to 100% RH. All units are shipped 
from the factory with a default setting to accept AC power 
with three-wire, 0 to 10 Vdc loop-powered output.

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 ratings given in instructions and on the 

product to ensure the product is suitable for your 
application.

3. Installer must be a trained, experienced service 

technician.

4. After instal ation is complete, check out product 

operation as provided in these instructions.

CAUTION

Electrical Shock or Equipment Damage 
Hazard.
Can shock individuals or short equipment 
circuitry.
Disconnect power supply before installation.

CAUTION

Equipment Damage Hazard.
Improper wiring can damage the sensor 
beyond repair.
Follow the wiring instructions carefully.

Mounting
The method of mounting depends on the particular 
sensor application. The following procedures include 
outdoor and duct applications. Also refer to the 
instructions for the electronic control.

Duct Mounting
The H7625B, H7635B and H7655B can be mounted in a 
duct to sense humidity and temperature.

IMPORTANT

Select a location to expose sensor to average 
duct humidity and temperature. Avoid locations 
where stratification can cause sensing errors.

NOTES:

H7635C is weatherproof for outdoor use. 
Knockouts allow 1/2 in. conduit connection.

To avoid damaging board during installation, 
the cover can be detached completely:

1.Careful y remove wire plug from board.
2.Set the cover aside.

1. Cut a hole in the duct just large enough to accept 

the sensing element.

2. Open case by rotating the cover counterclockwise.
3. Mount standard 1/2 in. conduit to the case.
4. Use case to mark mounting screw pilot hole 

locations.

5. Drill the pilot holes and fasten the sensor to the 

duct.

6. Wire the sensor. See Wiring section.

NOTE: The two free wires are thermistor wiring 

connections. When connecting these, use 
two wire nuts.

7. Reattach the wire plug and cover being careful not 

to pinch wires between the cover and case.

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