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Honeywell H7625B Installation Instructions Manual

Duct-mount and outdoor-mount humidity/temperature sensors.
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H7625B; H7635B,C; H7655B
Duct-Mount and Outdoor-Mount
Humidity/Temperature Sensors
INSTALLATION INSTRUCTIONS
APPLICATION
Mounting
The method of mounting depends on the particular
sensor application. The following procedures include
The H7625B, H7635B, H7655B Duct-Mount and H7635C
outdoor and duct applications. Also refer to the
Outdoor-Mount Humidity/Temperature Sensors are
instructions for the electronic control.
universal Relative Humidity transmitters that can be
powered with either a +18 to 36 Vdc or 24 Vac supply.
Duct Mounting
The sensors use a half-wave bridge rectifier to convert
AC power to a usable DC voltage. The device also
The H7625B, H7635B and H7655B can be mounted in a
includes a 20K ohm temperature sensor for optional use.
duct to sense humidity and temperature.
The humidity sensors are designed with a field-
IMPORTANT
selectable 4 to 20 mA, 0 to 5 Vdc, or 0 to 10 Vdc output
Select a location to expose sensor to average
signal equivalent to 0 to 100% RH. All units are shipped
duct humidity and temperature. Avoid locations
from the factory with a default setting to accept AC power
where stratification can cause sensing errors.
with three-wire, 0 to 10 Vdc loop-powered output.
NOTES:
H7635C is weatherproof for outdoor use.
INSTALLATION
Knockouts allow 1/2 in. conduit connection.
To avoid damaging board during installation,
the cover can be detached completely:
When Installing this Product...
1.Carefully remove wire plug from board.
1. Read these instructions carefully. Failure to follow
2.Set the cover aside.
them could damage the product or cause a
1. Cut a hole in the duct just large enough to accept
hazardous condition.
the sensing element.
2. Check ratings given in instructions and on the
2. Open case by rotating the cover counterclockwise.
product to ensure the product is suitable for your
3. Mount standard 1/2 in. conduit to the case.
application.
4. Use case to mark mounting screw pilot hole
3. Installer must be a trained, experienced service
locations.
technician.
5. Drill the pilot holes and fasten the sensor to the
4. After installation is complete, check out product
duct.
operation as provided in these instructions.
6. Wire the sensor. See Wiring section.
NOTE: The two free wires are thermistor wiring
CAUTION
connections. When connecting these, use
two wire nuts.
Electrical Shock or Equipment Damage
Hazard.
7. Reattach the wire plug and cover being careful not
Can shock individuals or short equipment
to pinch wires between the cover and case.
circuitry.
Disconnect power supply before installation.
CAUTION
Equipment Damage Hazard.
Improper wiring can damage the sensor
beyond repair.
Follow the wiring instructions carefully.
63-2579—3

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   Summary of Contents for Honeywell H7625B

  • Page 1

    The sensors use a half-wave bridge rectifier to convert AC power to a usable DC voltage. The device also The H7625B, H7635B and H7655B can be mounted in a includes a 20K ohm temperature sensor for optional use. duct to sense humidity and temperature.

  • Page 2

    H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS Output Settings (Table 1) Outdoor Mounting The H7635C senses outdoor air humidity and The board has three switch blocks: temperature. Mount this control where it can sense — A six DIP switch block.

  • Page 3

    H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS WIRING For voltage output, shielded cable (16-22 AWG) should be used. mA OUTPUT TRANSDUCER 18 TO 36 Vdc ONLY POWER SUPPLY For current output, either shielded cable or twisted pair (16-22 AWG) can be used.

  • Page 4

    H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS H76XX P7640 P7640 Vin (Vac) – – – – Vo (0-10 Vdc) W7760A ANALOG E-BUS E-BUS GND GND (HOT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M18302B TEMPERATURE SIGNAL CONNECTIONS ARE NOT POLARITY SENSITIVE.

  • Page 5

    H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS CHECKOUT Converting Output Signal to Percent RH CAUTION Equipment Damage Hazard. 4 to 20mA Signal Can short electric circuitry. • Never connect 120 Vac to the transducer. 〈 〉 signal [in mA] 4 –...

  • Page 6

    H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS APPENDIX RH Test and Configuration DIP Switch Settings (Table 3) 0% RH Output (for Testing Only) IMPORTANT • Only adjust these switches for troubleshooting or Transmitter always outputs a signal of 4 mA or 0 Vdc. The recalibrating the sensor.

  • Page 7

    H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS CALIBRATION Using Calibration Trim Potentiometers All transducers are factory calibrated to meet/exceed published specifications. Field adjustment should not be necessary. IMPORTANT IMPORTANT • Due to sensitive nature of humidity calibration, • Do not verify comparative RH with a sling adjusting trimmer potentiometers is not highly psychrometer.

  • Page 8

    Corporation. Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2005 Honeywell International Inc. 63-2579—3 B.B. Rev. 01-05...

This manual also for:

H7635c, H7635b, H7655b

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