Honeywell Smoke Alarm H7625B User Manual

H7625B; H7635B,C; H7655B  
Duct-Mount and Outdoor-Mount  
Humidity/Temperature Sensors  
INSTALLATION INSTRUCTIONS  
Mounting  
APPLICATION  
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.  
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.  
Duct Mounting  
The H7625B, H7635B and H7655B can be mounted in a  
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  
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.  
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.  
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.  
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.  
CAUTION  
Electrical Shock or Equipment Damage  
Hazard.  
7. Reattach the wire plug and cover being careful not  
Can shock individuals or short equipment  
circuitry.  
to pinch wires between the cover and case.  
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  
 
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  
ONLY  
18 TO 36 Vdc  
POWER SUPPLY  
For current output, either shielded cable or twisted pair  
(16-22 AWG) can be used.  
Vin  
Io  
+
NOTE: When using shielded cable, ground the shield  
only at the controller end (see Fig. 2). Grounding  
both ends can cause a ground loop.  
CONTROLLER, METER  
OR RECORDER  
INPUT SIGNAL  
+
The 20K ohm NTC temperature output is accessed  
through the separate blue and green wires (located inside  
the enclosure).  
COMMON  
GROUND  
M22528  
Fig. 2. Typical wiring diagram for transducer with two-  
wire mA output and external DC power supply.  
OUTDOOR  
AIR  
SENSOR  
HEAT  
RELAY 2  
T7770 REMOTE SENSOR  
DISCHARGE  
AIR  
SENSOR  
9
8
7
6
5
4
3
2
1
COMPRESSOR  
CONTACTOR 4  
COMPRESSOR  
CONTACTOR 2  
T7350  
SUBBASE  
T5  
T6  
T7  
T4  
T3  
OS  
M
OS  
M
AS  
X
AS  
W3/Y4 Y3  
W2  
Y1  
Y2  
G
5
HS  
HC  
HP  
RH RC AUX W1  
COMPRESSOR  
CONTACTOR 3  
FAN  
RELAY  
3
HEAT  
RELAY 1  
MOTION  
SENSOR  
Vo Gnd Vin  
(0-10 Vdc) (Vac)  
COMPRESSOR  
CONTACTOR 1  
HUMIDITY SENSOR  
4
L2  
L1  
ECONOMIZER  
1
2
(HOT)  
1
2
3
4
5
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD.  
HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER.  
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.  
HC AND HP PROVIDE 24 VAC TO THE HUMIDITY SENSOR.  
M22529  
Fig. 3. Humidity sensor (0-10 Vdc output) wiring with T7350  
(use with RH/Temperature combination T7350 units only).  
3
63-2579—3  
 
H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS  
H76XX  
P7640  
PWR  
P7640  
PWR  
Vin (Vac)  
Gnd  
+
O
+
+
O
+
O
2
COM  
OUT  
COM  
OUT  
Vo (0-10 Vdc)  
1
2
3
4
5
6
7
8
9
10  
AI  
11  
12 13  
1
AN
O
E
GND  
AI  
1
AI  
2
AI  
GND  
AI  
3
AI  
4
AI  
GND  
AI  
5
AI  
6
AI  
7
AI  
8
AI  
GND  
W7760A  
GND  
AO  
1
24  
24  
24  
24  
24  
24  
24 OUT 21 G
OUT OUT OUT OUT OUT OUT OUT OUT DI  
1
DI  
2
DI  
3
DI GND GND  
4
VAC VAC VAC VAC VAC VAC VAC COM VDC  
COM COM OUT  
1
2
3
4
5
6
7
8
17 18 19 20 21 22 23 24 25 26 27 28 29  
31 32 33 34 35 36 37 38 39 40
L1  
(HOT)  
1
L2  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
TEMPERATURE SIGNAL CONNECTIONS ARE NOT POLARITY SENSITIVE.  
M18302B  
Fig. 4. Typical wiring diagram for 5-wire temperature/humidity sensor with Vdc output  
(used with the XL15A controller).  
63-2579—3  
4
 
H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS  
CHECKOUT  
Converting Output Signal to Percent RH  
4 to 20mA Signal  
signal [in mA] – 4⟩  
------------------------------------------------- = p e r c e n t R H  
0.16  
CAUTION  
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.  
Example: 12 mA output signal  
(12 - 4)/ 0.16 = 50% RH  
NOTE: Use laboratory quality meters and gauges for  
applications requiring a high degree of accuracy.  
0 to 10 Vdc Signal  
1. Verify the transducer is mounted in the correct posi-  
tion.  
2. Verify appropriate input signal and voltage supply.  
3. Verify appropriate configuration range.  
Example: 8 VDC transmitter signal output  
8 Vdc/0.10 = 80% RH  
Table 2. Troubleshooting.  
Items to Check  
Problem  
No reading  
Verify correct supply voltage at the power terminal blocks.  
Verify correct wiring configuration and DIP switch settings.  
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.  
5
63-2579—3  
 
H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS  
APPENDIX  
RH Test and Configuration DIP Switch Settings (Table 3)  
IMPORTANT  
0% RH Output (for Testing Only)  
Transmitter always outputs a signal of 4 mA or 0 Vdc. The  
sensor does not affect the transmitter output.  
Only adjust these switches for troubleshooting or  
recalibrating the sensor. (Adjustment is not  
normally necessary.)  
For normal operation, always keep DIP switch 3  
in the ON position. When DIP switch 3 is off, the  
RH transmitter cannot read the sensor. This  
inability-to-read forces the output to never  
change.  
50% RH Output (for Testing Only)  
Transmitter always outputs a signal of 12 mA, 2.5 VDC, or  
5 VDC. The sensor does not affect transmitter output.  
100% RH Output  
Table 3. Test/Calibration Settings (Six-Switch Block).  
Transmitter always outputs a signal of 20 mA, 5 VDC, or  
10 VDC. The sensor does not affect the transmitter  
output. Sensor doesn’t affect the transmitter output.  
Setting  
Normal Operation (Default)  
0% RH Output  
6
5
4
3
2
1
On —  
On —  
Normal Operating Condition  
DIP switch 3 must be set in the On position for normal  
operation. All other DIP switches must be set Off.  
50% RH Output  
On —  
100% RH Output  
On —  
Increment RH Output  
Decrement RH Output  
Reset to Original Calibration  
On —  
On  
On On  
63-2579—3  
6
 
H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS  
CALIBRATION  
All transducers are factory calibrated to meet/exceed published  
specifications. Field adjustment should not be necessary.  
Using Calibration Trim Potentiometers  
IMPORTANT  
IMPORTANT  
Due to sensitive nature of humidity calibration,  
adjusting trimmer potentiometers is not highly  
recommended.  
Do not verify comparative RH with a sling  
psychrometer. Too many variables exist which  
induce errors into this process.  
Recalibration must be done in a controlled  
environment. Relative humidity must be held  
stable while making any adjustment.  
Verify the device output directly with calibrated  
instrumentation and verify RH with calibrated  
instrumentation. Never use a controller output.  
With correct power applied, and only a meter  
connected to the transducer output, ensure that  
the output is proportional to the true RH.  
Calibrate only in a stable humidity/temperature  
chamber of laboratory grade.  
Single Point Calibration  
IMPORTANT  
Use only one of the following two options.  
OPTION 1  
1. Select a controlled humidity environment between  
10 and 40 percent RH. Be sure humidity is stable.  
2. Adjust zero trimmer (z).  
Using Increment/Decrement Switches  
OPTION 2  
Increment RH Output  
1. Select a controlled humidity environment between  
40 and 70 percent RH. Be sure humidity is stable.  
2. Adjust span trimmer (s).  
This DIP switch allows you to calibrate the sensor through  
the software. The switch must be toggled from the Off to  
the On position and then returned to the Off position for  
an increase of 0.5% RH. This means that if your humidity  
has drifted 1% lower over a certain time period, you can  
toggle the Increment RH Output switch (2 times) in order  
to slide the whole curve upward 1%.  
Two Point Calibration  
1. Select a controlled humidity environment between  
10 and 40 percent RH. Be sure humidity is stable.  
2. Adjust zero trimmer (z).  
3. Select a controlled humidity environment between  
70 and 75 percent RH. Be sure humidity is stable.  
4. Adjust span trimmer (s).  
Decrement RH Output  
This DIP switch allows calibration in the same way as the  
Increment RH. The difference is that each toggle results  
in a decrease of 0.5% RH.  
7
63-2579—3  
 
®
LonSpec™ is a trademark of Echelon Corporation.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
customer.honeywell.com  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario M1V 4Z9  
® U.S. Registered Trademark  
© 2005 Honeywell International Inc.  
63-2579—3 B.B. Rev. 01-05  
 

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