Install Instructions

ManualsBrandsHoneywell ManualsHVAC SuppliesHumidity Transmitter, 3% RH accuracy w/ Optional 20K ohm Temp Output

Table Of Contents

INSTALLATION INSTRUCTIONS

62-0330-01

H7625B, H7626B, H7635B,C

H7636B, H7655B, H7656B

DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/

TEMPERATURE SENSORS

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.

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.

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 sup-

plied #8 X 3/4” self-tapping screws.

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

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.

Summary of content (8 pages)

PAGE 1
H7625B, H7626B, H7635B,C 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.
PAGE 2
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B Output Settings 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. 2. 3. 4. 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.
PAGE 3
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B REVERSE ACTING OUTPUT 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) 0-10V output mode 0V = 0% RH and 10V = 100% RH Reverse Acting (RA) 0-10V output mode, 0V = 100% and 10V = 0% To change the transmitter to reverse acting or back to direct acting, set switch 4 ON to put the unit in setup mode.
PAGE 4
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B TR23 Remote Sensor 12 11 10 9 8 7 6 5 4 3 2 OUTDOOR AIR SENSOR 1 HEAT RELAY 2 DISCHARGE AIR SENSOR T7350 SUBBASE T5 T6 T7 T4 T3 OS OS AS AS HP M M X RH COMPRESSOR CONTACTOR 4 W3/Y4 Y3 COMPRESSOR CONTACTOR 2 W2 Y2 Y1 G 5 HS HC RC AUX W1 COMPRESSOR CONTACTOR 3 3 MOTION SENSOR VOUT COM VIN (0-10 Vdc) (Vac) COMPRESSOR CONTACTOR 1 HUMIDITY SENSOR 4 1 ECONOMIZER L2 2 FAN RELAY HEAT RELAY 1 L1 (HOT) 1 POWER SUPPLY.
PAGE 5
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B HUMIDITY SENSOR 4-20mA VIN COM VOUT +TEMP 1 2 3 4 5 6 7 8 DO-1 DO-2 COM DO-3 DO-4 COM DO-5 DO-6 COM DO-7 DO-8 COM 24 VAC 24 VAC COM EGND SHLD SBUS1 SBUS2 NET-1 NET-2 AO-1 COM AO-2 AO-3 COM D1-1 D1-2 COM D1-3 D1-4 20VDC U1-1 COM U1-2 U1-3 COM U1-4 U1-5 COM U1-6 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 1 1 1 1 1 1 1 1 1 1 2 9 0 1 2 3 4 5 6 7 8 9 0 24 VAC + 24 VAC COM M31268 Fig. 7.
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.) 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. GREEN BLUE RED Switches 1, 2, and 3 are used for test mode.
PAGE 7
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B CALIBRATION NOTE: This is only a single point calibration. All transmitters 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).
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 Inc. 62-0330—01 E.K. Rev. 03-10 Printed in U.S.A.