Page 1
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.
Page 2
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
Page 3
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
Page 4
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
PWR
+
COM
–
O
OUT
12 234567
T7350
SUBBASE
1
P7640
TR23 Remote Sensor
891011 1
T5 T6 T7 T4 T3
VOUT
(0-10 Vdc)
HUMIDITY SENSOR
L2
2
L1
(HOT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2
ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD.
3
HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER.
4
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
5
HC AND HP PROVIDE 24 VAC TO THE HUMIDITY SENSOR.
Fig. 5. Humidity Sensor (0-10 Vdc output) wiring with T7350
(use with RH/Temperature combination T7350 units only).
P7640
PWR
+
COM
–
O
OUT
5
COM VIN
(Vac)
OUTDOOR
AIR
SENSOR
OSOS ASAS
M
MHC HPHS
MOTION
SENSOR
+
–
O
DISCHARGE
AIR
SENSOR
H76XX
VIN (Vac)
COM
VOUT (0-10 Vdc)
+
–
COMPRESSOR
CONTACTOR 4
RCX
3
2
HEAT
RELAY 2
W3/Y4 Y3 W2 Y2
W1 GY1
AUXRH
HEAT
RELAY 1
COMPRESSOR
CONTACTOR 1
4
ECONOMIZER
COMPRESSOR
CONTACTOR 2
FAN
RELAY
COMPRESSOR
CONTACTOR 3
M31307
12345 6789101112 14 161513
E
W7760A
OUT1OUT2OUT3OUT4OUT5OUT6OUT7OUT8DI1DI2DI3DI4GND GND
GND
AI1AI
AI3AI4AI5AI6AI7AI
AI
2
GND
GND
AI
17 18 19 20 21 22 23 24 25 26 27 28 29
L1
(HOT)
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2
TEMPERATURE SIGNAL CONNECTIONS ARE NOT POLARITY SENSITIVE.
Fig. 6. Typical wiring diagram for 5-wire temperature/humidity sensor with Vdc output
(used with the XL15A controller).
62-0330—01 4
ANALOG
AI
8
GND
OUT
AO1AO
OUT
COM
AO
GND
2
21
GND E-BUS E-BUS
VDC
OUT
VAC
COM
AI
GND
24
24
VAC
COM
24
VAC24VAC24VAC24VAC24VAC
31 32 33 34 35 36 37 38 39 40 41 42 43 44
M18302C
Page 5
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
CAUTION
HUMIDITY SENSOR
4-20mA VIN COM VOUT +TEMP
22 2222222333
1
2 3 4 5 6 7 8
AO-2
AO-3
COM
D1-1
AO-1
COM
EGND
SHLD
SBUS1
SBUS2
NET-1
24 VAC
1
24 VAC
+
-
24 VAC
COM
2 3 4 5 6 7 8
Fig. 7. Typical wiring diagram for 5-wire temperature/humidity sensor with Vdc output
NET-2
24 VAC COM
(used with the Spyder controller).
3
3
3
9 0 1 2
3
4
5
D1-2
COM
D1-3
D1-4
20VDC
U1-1
COM
U1-2
COM
DO-3
DO-4
COM
DO-5
DO-2
DO-6
DO-1
11111111112
9
0 1 2 3 4 5 6
3
6
U1-3
COM
7 8 9 0
CHECKOUT
Converting Output Signal to
Equipment Damage Hazard.
Can short electric circuitry.
• Never connect 120 Vac to the transducer.
• Connect only DC voltage to a transducer
intended for DC supply.
NOTE: Use laboratory quality meters and gauges for
applications requiring a high degree of
accuracy.
1. Verify that the transducer is mounted in the correct
position.
2. Verify appropriate input signal and voltage supply.
3. Verify appropriate configuration range.
Table 2. Troubleshooting.
Problem Items to Check
No reading • Verify correct supply voltage at the power terminal blocks.
Erratic readings • Verify all wires are terminated properly.
Inaccurate
readings
• Verify correct wiring configuration and DIP switch settings per Figures 2 and 3.
• Verify that terminal screws are connected tightly with all wires firmly in place.
• Ensure that there is no condensation on the board.
• Verify clean input power. In areas of high RF interference or noise, shielded cable can be
necessary to stabilize signal.
• If you suspect that the transmitter is not reading within the specified tolerance, please contact
the factory for further assistance
Percent RH
4 to 20mA Signal
((mA signal) -4) / 0.16 = percent RH
Example: 12mA output signal
(12-4) / 0.16 = 50% RH
0 to 5 Vdc Signal
(VDC signal) / 0.05 = percent RH
Example: 1.25vdc output signal
1.25 / 0.05 = 25% RH
0 to 10 Vdc Signal
(VDC signal) / 0.10 = percent RH
Example: 7.50vdc output signal
7.50 / 0.10 = 75% RH
3
7
COM
DO-7
U1-4
3
8
U1-5
DO-8
3
9
COM
COM
4
0
U1-6
M31268
5 62-0330—01
Page 6
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
APPENDIX
RH Test and Configuration DIP Switch Settings (Table 3)
IMPORTANT
• Only adjust these switches for troubleshooting or
recalibrating the sensor.
(Adjustment is not normally necessary.)
PUSH TAB IN AND PULL ON THE SENSOR
RED
FACTO RY
USE ONLY
CABLE TO REMOVE FROM J13 CONNECTOR
GREEN
BLUE
SW1
1ON2345678
J14
P1P2
ZEROSPAN
Test mode will make the transmitter output a fixed 0%,
50%, or 100% value. The sensor will not affect the
transmitter output. This is used for troubleshooting or
testing only.
Switches 1, 2, and 3 are used for test mode. The output
will be a fixed 0%, 50%, or 100% signal that corresponds
to the output selected with switches 6, 7, and 8. Refer to
Figure 4 for switch settings.
TEST SELECTION
SWITCHES (SW1)
ON
OFF
ON
OFF
ON
OFF
SW1
SW1
SW1
0% RH OUTPUT
1ON2345678
50% RH OUTPUT
1ON2345678
100% RH OUTPUT
1ON2345678
J13
TB1
4-20mA VIN VOUTCOM
FACTO RY
USE ONLY
J2
WIRE CONNECTIONS
M31322
Fig. 8. Settings
Table 3. Test and Calibration Settings (8-Switch Block).
Setting 12345678
4-20mA Output ————————
0-5 VDC Output —————OnOn—
0-10 VDC Output ——————OnOn
0% RH Output On———————
50% RH Output —On——————
100% RH Output ——On—————
Increment RH Output ———On**On———
Decrement RH Output ———On**—On——
Reset to Original Calibration ———On**OnOn——
Reverse or Direct Acting — On — On** On — — —
Reverse or Direct Acting Reset — On — On** On On — —
* = Switch setting does not affect output
** = This switch needs to be activated first
— = Indicates OFF
62-0330—01 6
Page 7
CALIBRATION
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
NOTE: This is only a single point calibration. All trans-
mitters are factory calibrated to meet/exceed
published specifications. Field adjustment
should not be necessary.
The dipswitch allows the user to calibrate the sensor
through the software. Setting switch 4 ON will put the
transmitter into setup mode allowing the increment and
decrement to work. Once in setup mode, the output will
change to 50% (2.5V for 0-5V, 5V for 0-10V, 12mA for 420mA). Each increment or decrement step will cause the
output to change by 0.1V for 0-5V, 0.2V for 0-10V, and
0.32mA for 4-20mA in setup mode. This can be used to
show the user how far offset the transmitter is. To see the
starting point again set switch 1 ON. This will show the
50% output again. When the unit is out of setup mode the
output will go back to RH output.
Increment RH Output
This will shift the RH output linearly up in 0.5% steps.
Switch 4 must be set to ON first. After switch 4 is on, each
time switch 5 is set ON the RH output will increase by
0.5%. The increase goes into effect each time switch 5 is
set to ON.
Decrement RH Output
This will shift the RH output linearly down in 0.5% steps.
Switch 4 must be set to ON first. After switch 4 is on, each
time switch 6 is set ON the RH output will decrease by
0.5%. The decrease goes into effect each time switch 6 is
set to ON.
Reset RH Output
This will reset the RH output back to the original
calibration. Switch 4 must be set to ON first. After switch 4
is on, toggle switches 5 and 6 ON then OFF. After 5 and 6
are OFF slide switch 4 OFF.
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.
7 62-0330—01
Page 8
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
LonSpec™ is a trademark of Echelon® Corporation.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Registered Trademark
© 2010 Honeywell International In c.
62-0330—01 E.K. Rev.
Printed in U.S.A.
03-10
Loading...