Honeywell H7625B, H7635B, H7636B, H7626B, H7656B Installation Instructions Manual
...
62-0330-01
H7625B, H7626B, H7635B,C
CAUTION
CAUTION
H7636B, H7655B, H7656B
DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/
TEMPERATURE SENSORS
INSTALLATION INSTRUCTIONS
APPLICATION
The H76XXB Duct-Mount and H76XXC Outdoor-Mount
Humidity/Temperature Sensors are universal Relative
Humidity transmitters that can be powered with either a
+18 to 40 Vdc or 24 Vac supply . The devices are half
wave rectified. The transmitter also includes either a 20K
ohm NTC thermistor or a 1K platinum PTC (compatible
with the T775) for optional temperature 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 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.
Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
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 Configuration
The H7625B, H7626B, H7635B, H7636B, H7655B and
H7656B 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:
• Knockouts allow 1/2 in. conduit connection. To avoid
damaging board during installation, the cover can be
detached completely:
• Carefully remove wire plug from board.
• Set the cover aside.
1. Drill a 3/4” diameter hole in the duct where the
transmitter is to be mounted.
2. Insert the stainless steel probe into the hole until
the foam is in direct contact with the duct.
3. Attach the transmitter to the duct using the supplied #8 X 3/4” self-tapping screws.
4. Remove the cover and install your conduit connector or watertight fitting. The outer ring is used when
using a 1/2” NPT conduit fitting.
5. After wiring the unit, place the cover back on and
gently turn it until it is tight.
Outdoor Mounting Configuration
The H7635C senses outdoor air humidity and
temperature. Mount this control where it can sense
average outdoor air humidity and temperature. Normally,
the north side of a building provides a suitable location.
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:
• Carefully remove wire plug from board.
• Set the cover aside.
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
The transmitter should be mounted under an eave, shield,
or in an area out of the elements or direct sunlight. The
aluminum tube should point down when mounting the
outside transmitter.
Refer to Figure 1 for proper mounting position.
1. Place the unit where it is to be mounted with the
cover facing out.
2. Attach the unit with the supplied #8 X 3/4” self-tapping screws.
3. Remove the cover and install your conduit connector, watertight fitting or 1/2” vent plug. The outer
ring is used when using a 1/2” NPT conduit fitting.
4. After wiring the unit, place the cover back on and
turn it until it is tight.
INCORRECT CORRECT
M31319
Fig. 1. Typical sensor location.
PUSH TAB IN AND PULL ON THE SENSOR
RED
FACTO RY
USE ONLY
CABLE TO REMOVE FROM J13 CONNECTOR
GREEN
BLUE
SW1
1ON2345678
J13
J14
P1P2
ZEROSPAN
4-20mA VIN VOUTCOM
Output Settings
The humidity output signal can be adjusted for 0-5Vdc, 010 Vdc or 4-20 mA using the switch block. Switches 6, 7,
and 8 are used to set the output.
NOTE: Refer Fig. 2 for switch settings.
Table 1. Controller Compatibility
and Output Settings.
Controller
W7750, W7760,
W7761
W7750B,C
W7760C, W7753,
W7760
T7350, XL50,
XL100, XL500 XF
Modules, XFL
Required Sensor Output
Setting
4-20 mA C7600C
0-10 Vdc (default) H7621/31
0-10 Vdc (default) n/a
Non-Honeywell 0-5 Vdc n/a
0-10 VDC OUTPUT
ON
OFF
ON
OFF
ON
OFF
SW1
SW1
SW1
(DEFAULT)
1ON2345678
0-5VDC OUTPUT
1ON2345678
4-20mA OUTPUT
1ON2345678
FACTO RY
USE ONLY
J2
TB1
ONSPEC™
L
Setting
WIRE CONNECTIONS
Fig. 2. DIP switch and Wire Connection locations.
62-0330—01 2
M31320
REVERSE ACTING OUTPUT
CAUTION
CAUTION
The output can be changed to reverse acting mode. The
output range stays the same but the corresponding RH
value is opposite.
Example: Direct Acting (DA) (Default)
To change the transmitter to reverse acting or back to
direct acting, set switch 4 ON to put the unit in setup
mode. After switch 4 is on, switch 2 will put the unit in
direct/reverse acting mode. When switch 2 is set to ON,
the output can be used to show if the unit is in direct or
reverse acting mode. For direct acting the output will be
1V for 0-5V, 2V for 0-10V, and 7.2mA for 4-20mA. For
reverse acting the output will be 4V for 0-5V, 8V for 0-10V,
and 16.8mA for 4-20mA.
With switches 2 and 4 ON, each time switch 5 is set to
ON the output will change to reverse acting or direct
acting.
To reset the unit to the default setting, toggle both
switches 5 and 6 ON then OFF while both switches 2 and
4 are ON.
When all calibration is completed, remember to place the
switches back into the positions that correspond to the
output needed as shown in Figure 3.
0-10V output mode
0V = 0% RH and 10V = 100% RH
Reverse Acting (RA)
0-10V output mode,
0V = 100% and 10V = 0%
WIRING
A 16 to 22 AWG shielded cable is recommended for all
transmitters. Twisted pair may be used for 2-wire current
output transmitters. the connections to the temperature
sensor should be made with wire nuts or crimp-style
connectors.Refer to Figure 3 for wiring diagrams.
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
Never connect or disconnect wiring with
power applied.
TEMPERATURE SENSOR-
TEMPERATURE SENSOR+
SUPPLY VOLTAGE
4-20mA OUTPUT
TEMPERATURE SENSORTEMPERATURE SENSOR+
SUPPLY GROUND/SIGNAL COMMON
0-10 OR 0-5 VDC OUTPUT SIGNAL
SUPPLY GROUND/SIGNAL COMMON
SUPPLY VOLTAGE
4-20mA OUTPUT
TEMPERATURE SENSORTEMPERATURE SENSOR+
SUPPLY VOLTAGE
2 WIRE CURRENT OUTPUT SIGNAL
3 WIRE CURRENT OUTPUT SIGNAL
VOLTAGE OUTPUT SIGNAL
CONNECT TO THE 2
22 AWG 24” FLYING LEADS
4-20mA VIN VOUTCOM
CONNECT TO THE 2
22 AWG 24” FLYING LEADS
4-20mA VIN VOUTCOM
CONNECT TO THE 2
22 AWG 24” FLYING LEADS
4-20mA VIN VOUTCOM
TB1
TB1
TB1
M31321
Fig. 3. Wiring Diagrams
It is recommended that you use an isolated
UL-listed class 2 transformer when powering
the unit with 24 VAC. Failure to wire the
devices with the correct polarity when sharing
transformers may result in damage to any
device powered by the shared transformer.
IMPORTANT
When using shielded cable, ground the shield
only at the controller end (see Fig. 4). Grounding
both ends can cause a ground loop.
mA OUTPUT
TRANSDUCER
ONLY
18 TO 36 Vdc
POWER SUPPLY
Vin +
4-20mA –
CONTROLLER, METER
OR RECORDER
INPUT SIGNAL
+
COMMON
–
GROUND
M22528A
Fig. 4. Typical wiring diagram for transducer with two-
wire mA output with external DC power supply.
3 62-0330—01
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