Honeywell C7772A Manual de servicio

® U.S. Registered Trademark

INSTALLATION INSTRUCTIONS

62-0215

C7772A,B,C,D

Wallplate Temperature Sensors

APPLICATION

The C7772A,B,C,D Wallplate Temperature Sensors

provide a resistive output signal proportional to sensed

room or space temperature. The sensors are well suited

for low profile wall mounted applications where durability

and tamperproof construction is desired, such as

schools, prisons and institutions.

The C7772A Wallplate Temperature Sensors are

designed to be used with the Excel 5000 family, XL10,

XL15, T7350, and other Honeywell controllers.

Fig. 1. C7772 Dimensions in in. (mm).

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 the ratings given in the instructions and on

the product to make sure 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.

5. Follow local codes for installation and application.

IMPORTANT

All wiring must agree with applicable codes,

ordinances and regulations.

CAUTION

Electrical Shock or Equipment Damage

Hazard.

Can shock individuals or short equipment

circuitry.

Disconnect all power supplies before installation.

Location

The sensor should be located where it can sample an

average air temperature. Avoid locations where air

stratification can cause sensing errors. The sensor

mounts directly on a 2 in. x 4 in. conduit box with the

screws provided.

Mounting

To mount on conduit box (see Fig. 2):

1. Remove the appropriate knockout on the standard

utility conduit box for the application.

2. Make wiring connections to the system

components.

IMPORTANT

Level only for appearance. The sensor

functions normally even when not level.

3. Use the No. 6 screws provided to mount the wall-

plate to the conduit box.

Wiring

CAUTION

Electrical Shock or Equipment Damage

Hazard.

Can shock individuals or short equipment

circuitry.

Disconnect all power supplies before installation.

4-1/2

(114) 3-5/16

(84)

2-3/4 (70) 5/16 (8)

M16295

62-0215 B.B. 11-04 www.honeywell.com

C7772A,B,C,D WALLPLATE 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

CAUTION

Erratic System Operation Hazard.

Failure to follow proper wiring practices can

introduce disruptive electrical interference

(noise).

Keep wiring at least one foot away from large

inductive loads such as motors, line starters,

lighting ballasts, and large power distribution

panels.

Shielded cable is required in installations where

these guidelines cannot be met.

Ground shield only to grounded controller case.

IMPORTANT

• Temperature sensor wiring can be sized from

16 to 20 AWG depending on the application.

• The maximum length of wire from a device to

the wallplate sensor is 300 ft (91m).

NOTE: Erratic temperature readings from a sensor can

be caused by the wiring practices described

below. These must be avoided to assure proper

operation:

1. Do not route temperature sensor wiring with

building power wiring, next to control

contactors, near light dimming circuits,

electric motors or welding equipment.

2. Avoid poor wiring connections.

3. Do not mount sensor in an incorrect

environment.

Connect the low voltage wiring from the controller

terminals to the sensor wires using wirenut connectors

(not provided). See Fig. 2.

Fig. 2. Mounting, wiring for C7772.

OPERATION

The sensor provides a resistive output signal proportional

to the sensed room temperature.

CHECKOUT

The sensor is immediately operational after wiring

connections are made. Use an accurate thermometer of

±1°F (0.5°C) to measure the temperature at the sensor

location. To verify sensor accuracy, use an ohmmeter to

measure the resistance across the sensor wires and use

Table 1 to check the accuracy of the specific model.

Table 1. Typical Resistance of Sensor Models.

TANDARD

TILIT

IT B

NNE

AND

APPR

PRIATE

TEM

NENT

BLANK

EPLAT

Typical Resistance (in ohms)

C7772A

(20K ohm NTC)

C7772B

(PT1000)

C7772C

(PT100)

C7772D

(PT3000)

At 41°F (5°C) 54,200 1020 102 3310

At 50°F (10°C) 41,758 1039 103.9 3353

At 59°F (15°C) 32,427 1059 105.9 3397

At 68°F (20°C) 25,370 1078 107.8 3440

At 77°F (25°C) 20,000 1097 109.7 3484

At 86°F (30°C) 15,856 1117 111.7 3527

At 95°F (35°C) 12,654 1137 113.7 3571

By using this Honeywell literature, you agree that Honeywell will have no liability

for any damages arising out of your use or modification to, the literature. You will

defend and indemnify Honeywell, its affiliates and subsidiaries, from and against

any liability, cost, or damages, including attorneys’ fees, arising out of, or

resulting from, any modification to the literature by you.

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