Honeywell Humidity Sensor
Honeywell Humidity Sensor
Honeywell Humidity Sensor
APPLICATION Mounting
The method of mounting depends on the particular
The H76XXB Duct-Mount and H76XXC Outdoor-Mount sensor application. The following procedures include
Humidity/Temperature Sensors are universal Relative outdoor and duct applications. Also refer to the
Humidity transmitters that can be powered with either a instructions for the electronic control.
+18 to 40 Vdc or 24 Vac supply . The devices are half
wave rectified. The transmitter also includes either a 20K Duct mounting Configuration
ohm NTC thermistor or a 1K platinum PTC (compatible The H7625B, H7626B, H7635B, H7636B, H7655B and
with the T775) for optional temperature use. H7656B can be mounted in a duct to sense humidity and
temperature.
The humidity sensors are designed with a field selectable
4 to 20 mA, 0 to 5 Vdc, or 0 to 10 Vdc output signal IMPORTANT
equivalent to 0 to 100% RH. All units are shipped from Select a location to expose sensor to average
the factory with a default setting to accept AC power with duct humidity and temperature. Avoid locations
three-wire, 0 to 10 Vdc output. where stratification can cause sensing errors.
NOTES:
INSTALLATION • Knockouts allow 1/2 in. conduit connection. To avoid
damaging board during installation, the cover can be
detached completely:
When Installing this Product... • Carefully remove wire plug from board.
1. Read these instructions carefully. Failure to follow • Set the cover aside.
them could damage the product or cause a
hazardous condition.
2. Check ratings given in instructions and on the 1. Drill a 3/4” diameter hole in the duct where the
product to ensure the product is suitable for your transmitter is to be mounted.
application. 2. Insert the stainless steel probe into the hole until
3. Installer must be a trained, experienced service the foam is in direct contact with the duct.
technician. 3. Attach the transmitter to the duct using the sup-
4. After installation is complete, check out product plied #8 X 3/4” self-tapping screws.
operation as provided in these instructions. 4. Remove the cover and install your conduit connec-
tor 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
CAUTION gently turn it until it is tight.
Electrical Shock or Equipment Damage
Hazard. Outdoor Mounting Configuration
Can shock individuals or short equipment The H7635C senses outdoor air humidity and
circuitry. temperature. Mount this control where it can sense
Disconnect power supply before installation. average outdoor air humidity and temperature. Normally,
the north side of a building provides a suitable location.
CAUTION NOTES:
• H7635C is weatherproof for outdoor use. Knockouts
Equipment Damage Hazard. allow 1/2 in. conduit connection.
Improper wiring can damage the sensor • To avoid damaging board during installation, the cover
beyond repair. can be detached completely:
Follow the wiring instructions carefully. • Carefully remove wire plug from board.
• Set the cover aside.
62-0330-01
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
1. Place the unit where it is to be mounted with the NOTE: Refer Fig. 2 for switch settings.
cover facing out.
2. Attach the unit with the supplied #8 X 3/4” self-tap- Table 1. Controller Compatibility
ping screws. and Output Settings.
3. Remove the cover and install your conduit connec- Required Sensor Output LONSPEC™
tor, watertight fitting or 1/2” vent plug. The outer Controller Setting Setting
ring is used when using a 1/2” NPT conduit fitting.
4. After wiring the unit, place the cover back on and W7750, W7760, 4-20 mA C7600C
turn it until it is tight. W7761
W7750B,C 0-10 Vdc (default) H7621/31
W7760C, W7753,
W7760
T7350, XL50, 0-10 Vdc (default) n/a
XL100, XL500 XF
Modules, XFL
Non-Honeywell 0-5 Vdc n/a
INCORRECT CORRECT
M31319
FACTORY (DEFAULT)
USE ONLY
SW1
ON
J2 ON
OFF
J13 1 2 3 4 5 6 7 8
SW1
ON
0-5VDC OUTPUT
1 2 3 4 5 6 7 8
SW1
ON
ON
J14 OFF
1 2 3 4 5 6 7 8
ON
SPAN ZERO
4-20mA VIN COM VOUT
OFF
1 2 3 4 5 6 7 8
62-0330—01 2
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
direct/reverse acting mode. When switch 2 is set to ON, 3 WIRE CURRENT OUTPUT SIGNAL
the output can be used to show if the unit is in direct or TEMPERATURE SENSOR- CONNECT TO THE 2
reverse acting mode. For direct acting the output will be TEMPERATURE SENSOR+ 22 AWG 24” FLYING LEADS
1V for 0-5V, 2V for 0-10V, and 7.2mA for 4-20mA. For SUPPLY GROUND/SIGNAL COMMON
reverse acting the output will be 4V for 0-5V, 8V for 0-10V, SUPPLY VOLTAGE
4-20mA OUTPUT
and 16.8mA for 4-20mA.
TB1
WIRING
M31321
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 18 TO 36 Vdc
ONLY POWER SUPPLY
Vin +
4-20mA –
CONTROLLER, METER
OR RECORDER
+ INPUT SIGNAL
– COMMON
GROUND
M22528A
3 62-0330—01
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
DISCHARGE
AIR COMPRESSOR COMPRESSOR
SENSOR CONTACTOR 4 CONTACTOR 2
T7350
SUBBASE
T5 T6 T7 T4 T3 OS OS AS AS W3/Y4 Y3 W2 Y2
5
HS HC HP M M X RH RC AUX W1 Y1 G
COMPRESSOR
CONTACTOR 3
3 HEAT FAN
MOTION
RELAY 1 RELAY
VOUT COM VIN SENSOR
(0-10 Vdc) (Vac)
HUMIDITY SENSOR COMPRESSOR
CONTACTOR 1
4
L2 ECONOMIZER
1 2
L1
(HOT)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
W7760A E AI AI AI AI AI AI AI AI AI AI AI AI ANALOG
OUT
AO
GND 1 2 GND 3 4 GND 5 6 GND 7 8 GND GND
AO AO
1 2
OUT OUT OUT OUT OUT OUT OUT OUT DI DI DI DI GND GND 24 24 24 24 24 24 24 OUT 21 GND E-BUS E-BUS
1 2 3 4 5 6 7 8 1 2 3 4 VAC VAC VAC VAC VAC VAC VAC COM VDC
COM COM OUT
17 18 19 20 21 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 39 40 41 42 43 44
L1
(HOT)
1
L2
Fig. 6. Typical wiring diagram for 5-wire temperature/humidity sensor with Vdc output
(used with the XL15A controller).
62-0330—01 4
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
HUMIDITY SENSOR
4-20mA VIN COM VOUT +TEMP
2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
20VDC
AO-2
AO-3
COM
COM
COM
COM
COM
AO-1
COM
D1-1
D1-2
D1-3
D1-4
U1-1
U1-2
U1-3
U1-4
U1-5
U1-6
24 VAC COM
DO-3
DO-4
DO-5
DO-6
DO-7
DO-8
DO-1
DO-2
COM
COM
COM
COM
24 VAC
SBUS1
SBUS2
EGND
NET-1
NET-2
SHLD
1 1 1 1 1 1 1 1 1 1 2
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
24 VAC
+
-
24 VAC
COM M31268
Fig. 7. Typical wiring diagram for 5-wire temperature/humidity sensor with Vdc output
(used with the Spyder controller).
CHECKOUT
Converting Output Signal to
CAUTION Percent RH
Equipment Damage Hazard.
Can short electric circuitry.
• Never connect 120 Vac to the transducer. 4 to 20mA Signal
• Connect only DC voltage to a transducer
((mA signal) -4) / 0.16 = percent RH
intended for DC supply.
Example: 12mA output signal
NOTE: Use laboratory quality meters and gauges for (12-4) / 0.16 = 50% RH
applications requiring a high degree of
accuracy.
0 to 5 Vdc Signal
1. Verify that the transducer is mounted in the correct (VDC signal) / 0.05 = percent RH
position. Example: 1.25vdc output signal
2. Verify appropriate input signal and voltage supply. 1.25 / 0.05 = 25% RH
3. Verify appropriate configuration range.
0 to 10 Vdc Signal
(VDC signal) / 0.10 = percent RH
Example: 7.50vdc output signal
7.50 / 0.10 = 75% RH
Table 2. Troubleshooting.
Problem Items to Check
No reading • Verify correct supply voltage at the power terminal blocks.
• 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.
Erratic readings • Verify all wires are terminated properly.
• 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.
Inaccurate • If you suspect that the transmitter is not reading within the specified tolerance, please contact
readings the factory for further assistance
5 62-0330—01
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
APPENDIX
RH Test and Configuration DIP Switch Settings (Table 3)
IMPORTANT Test mode will make the transmitter output a fixed 0%,
• Only adjust these switches for troubleshooting or 50%, or 100% value. The sensor will not affect the
recalibrating the sensor. transmitter output. This is used for troubleshooting or
(Adjustment is not normally necessary.) testing only.
TEST SELECTION
SWITCHES (SW1)
FACTORY 0% RH OUTPUT
SW1
USE ONLY ON
ON
J2
OFF
1 2 3 4 5 6 7 8
J13
SW1 50% RH OUTPUT
ON
SW1
ON
1 2 3 4 5 6 7 8 ON
OFF
1 2 3 4 5 6 7 8
J14
100% RH OUTPUT
TB1 SW1
P2 P1
ON
FACTORY ON
USE ONLY OFF
1 2 3 4 5 6 7 8
SPAN ZERO
4-20mA VIN COM VOUT
Fig. 8. Settings
62-0330—01 6
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
CALIBRATION
NOTE: This is only a single point calibration. All trans-
mitters are factory calibrated to meet/exceed
Decrement RH Output
published specifications. Field adjustment This will shift the RH output linearly down in 0.5% steps.
should not be necessary. 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
The dipswitch allows the user to calibrate the sensor 0.5%. The decrease goes into effect each time switch 6 is
through the software. Setting switch 4 ON will put the set to ON.
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 4-
Reset RH Output
20mA). Each increment or decrement step will cause the This will reset the RH output back to the original
output to change by 0.1V for 0-5V, 0.2V for 0-10V, and calibration. Switch 4 must be set to ON first. After switch 4
0.32mA for 4-20mA in setup mode. This can be used to is on, toggle switches 5 and 6 ON then OFF. After 5 and 6
show the user how far offset the transmitter is. To see the are OFF slide switch 4 OFF.
starting point again set switch 1 ON. This will show the
50% output again. When the unit is out of setup mode the When all calibration is completed, remember to place the
output will go back to RH output. switches back into the positions that correspond to the
output needed as shown in Figure 3.
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.
7 62-0330—01
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
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