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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 installation 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.
INSTALLATION INSTRUCTIONS
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.Carefully 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.
63-2579—3
Related Manuals for Honeywell H7625B
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...