Honeywell H7625A User manual

INSTALLATION INSTRUCTIONS

62-0208—3

H7625A, H7635A

Humidity/Temperature Sensors

WALL-MOUNT MODELS

APPLICATION

The H7625A, H7635A Wall-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.

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 loop-powered 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.

Location

Install the device where it cannot be affected by:

— drafts, or dead spots behind doors and in corners.

— hot or cold air from ducts.

— radiant heat from sun or appliances.

— concealed pipes and chimneys.

— unheated (uncooled) areas such as an outside wall

behind the device.

Mounting

The housing base mounts over standard 2 in. x 4 in.

single gang junction box or flush to the wall:

1. Install the sensor about 5 ft (1.5m) above the floor

in an area with good air circulation at average

humidity and temperature. (See Fig. 1.)

2. Ensure the device receives adequate airflow.

3. Wire the device. (See Fig. 4 through 3.)

4. Ensure proper DIP switch settings.

5. Apply power to the unit.

6. Snap the cover into position.

7. Turn out the 1/16 in. allen screws at the bottom of

the enclosure until the cover cannot be removed.

Fig. 1. Typical sensor location.

5 FEET

(1.5 METERS)

YES NO

NO NO

M4823A

H7625A, H7635A HUMIDITY/TEMPERATURE SENSORS

62-0208—3 2

Output Settings (Table 1)

The board has three switch blocks:

— A six DIP switch block.

— A four DIP switch block.

— A white gang switch on a blue block.

1. Adjust the 4-switch block according to Table 1.

NOTE: The 6-switch block normally requires no

adjustment. (See the Appendix.)

2. Set the gang switch (white switch in blue block) to

correspond with the output (mA or Vdc).

NOTE: See Fig. 2 for DIP switch locations.

Table 1. Controller Compatibility

and Output Settings.

Fig. 2. DIP switch locations and settings.

WIRING

For voltage output, shielded cable (16-22 AWG) should

be used.

For current output, either shielded cable or twisted pair

(16-22 AWG) can be used.

IMPORTANT

When using shielded cable, ground the shield

only at the controller end (see Fig. 3). Grounding

both ends can cause a ground loop.

NOTE: See Table 2 for terminal designations.

Table 2. Terminal Designations.

Fig. 3. Typical wiring diagram for transducer with two-

wire mA output with external DC power supply.

Controller

Required

Sensor

Output

Setting

4-Switch Block

Settings

Blue and

White

Output

Switch

LONSPEC™

Setting4321

W7750, W7760,

W7761

4-20 mA — On — — 4-20 mA C7600C

W7750B,C

W7760C,

W7753, W7760

0-10 Vdc

(default)

On — — On Vout H7621/31

T7350, XL50,

XL100,

XL500 XF

Modules, XFL

0-10 Vdc

(default)

On — — On Vout n/a

Non-Honeywell 0-5 Vdc On — On — Vout n/a

M22659A

NORMAL

OPERATION

OFF ON

OFF

0-10 VDC

OFF

4-20 MA

0-5 VDC

OFF

Terminal Designation

1mAout

2Vin(power)

3 GND (common)

4 Vdc (out)

520KNTC

620KNTC

mA OUTPUT

TRANSDUCER

ONLY

18 TO 36 Vdc

POWER SUPPLY

CONTROLLER, METER

OR RECORDER

INPUT SIGNAL

COMMON

Vin +

Io –

–

M22528

GROUND

H7625A, H7635A HUMIDITY/TEMPERATURE SENSORS

3 62-0208—3

Fig. 4. Humidity Sensor (0-10 Vdc output) wiring with T7350

(use with RH/Temperature combination T7350 units only).

Fig. 5. Typical wiring diagram for 5-wire temperature/humidity sensor with Vdc output

(used with the XL15A controller).

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

RCX

T7350

SUBBASE

W1 G

T7770 REMOTE SENSOR

W3/Y4 Y3 W2 Y2

AUXRH

T5 T6 T7 T4 T3

DISCHARGE

AIR

SENSOR

OUTDOOR

AIR

SENSOR

MOTION

SENSOR

HUMIDITY

SENSOR

OSOS ASAS

MHC HP

Gnd Vin

(HOT)

COMPRESSOR

CONTACTOR 1

COMPRESSOR

CONTACTOR 2

HEAT

RELAY 1

123456789

FAN

RELAY

ECONOMIZER

HEAT

RELAY 2

COMPRESSOR

CONTACTOR 3

COMPRESSOR

CONTACTOR 4

GND

OUT

GND GND 24

VAC

COM

VAC

COM

VAC

OUT

COM

VDC

OUT

GND E-BUS E-BUS

ANALOG

OUT

17 18 19 20 21 22 23 24 25 26 27 28 29

(HOT)

31 32 33 34 35 36 37 38 39 40 41 42 43 44

12345 678 9101112 14 1615

W7760A AI

GND

–

P7640

–

P7640

–

H76XX

–

M18302A

Vin

Gnd

PWR

COM

OUT

PWR

COM

OUT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

TEMPERATURE SIGNAL CONNECTIONS ARE NOT POLARITY SENSITIVE.

H7625A, H7635A HUMIDITY/TEMPERATURE SENSORS

62-0208—3 4

CHECKOUT

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.

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.

Converting Output Signal to Percent RH

4 to 20mA Signal

Example: 12 mA output signal

(12 - 4)/ 0.16 = 50% RH

0 to 10 Vdc Signal

Example: 8 VDC transmitter signal output

8 Vdc/0.10 = 80% RH

Table 3. Troubleshooting.

signal [in mA] 4–〈〉

0.16

------------------------------------------------- p e r c e n t R H=

Problem Items to Check

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.

H7625A, H7635A HUMIDITY/TEMPERATURE SENSORS

5 62-0208—3

APPENDIX

RH Test and Configuration DIP Switch Settings (Table 4)

IMPORTANT

• 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.

Table 4. Test and Calibration Settings (6-Switch Block).

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.

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 the transmitter output.

100% RH Output

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.

Normal Operating Condition

DIP switch 3 must be set in the On position for normal

operation. All other DIP switches must be set Off.

Setting 654321

Normal Operation (Default) — — — On — —

0%RHOutput On—————

50%RHOutput —On————

100% RH Output — — On — — —

Increment RH Output — — — — On —

DecrementRHOutput —————On

Reset to Original Calibration — — — — On On

H7625A, H7635A HUMIDITY/TEMPERATURE SENSORS

62-0208—3 6

CALIBRATION

All transducers are factory calibrated to meet/exceed published

specifications. Field adjustment should not be necessary.

IMPORTANT

• Do not verify comparative RH with a sling

psychrometer. There are too many variables

which induce errors into this process.

• Recalibration must be done in a controlled

environment. Relative humidity must be held sta-

ble 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.

Using Increment/Decrement Switches

Increment RH Output

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 will

be able to toggle the Increment RH Output switch (2)

times in order to slide the whole curve upward 1%.

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.

Using Calibration Trim Potentiometers

IMPORTANT

• Due to the sensitive nature of humidity

calibration, adjusting trimmer potentiometers

is not highly recommended.

• 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).

OPTION 2

1. Select a controlled humidity environment between

40 and 70 percent RH. Be sure humidity is stable.

2. Adjust span trimmer (s).

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).

H7625A, H7635A HUMIDITY/TEMPERATURE SENSORS

7 62-0208—3

H7625A, H7635A HUMIDITY/TEMPERATURE SENSORS

Automation and Control Solutions

Honeywell International Inc. Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North 35 Dynamic Drive

Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9

customer.honeywell.com

® U.S. Registered Trademark

62-0208—3 B.B. Rev. 01-05

LonSpec™ is a trademark of Echelon®Corporation.

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