Honeywell C7776A Bedienungsanleitung

INSTALLATION INSTRUCTIONS

95-7557-04

C7770A/C7776A/C7778A

Air Temperature Sensor

OVERVIEW

The C7770A, C7776A, C7778A Air Temperature Sensors are

direct wired temperature sensors that are used to sense

discharge or return air in a duct.

The C7770A Sensors contain a temperature sensitive 20K

ohm NTC nonlinearized thermistor and are compatible with

the Excel 10 controller. The C7776As are 10 ohm NTC Type II

sensors that are compatible with TB7600, TB7300, and

TB7200 communicating thermostats. The C7778As are 10

ohm NTC Type III sensors that are compatible with WEBs-AX

I/O modules.

BEFORE INSTALLATION

All wiring must comply with local electrical codes and

ordinances or as specified on installation wiring diagrams.

Air temperature sensor wiring can be sized from 14 to

22 AWG (2.0 to 0.34 mm2) depending on the application. The

maximum length of wire from a device to a wall module is

1000 ft (305m). Twisted pair wire is recommended for wire

runs longer than 100 ft (30.5m). Run sensor wiring separately

from 50 VAC or greater power wiring to avoid electromagnetic

interference.

INSTALLATION

CAUTION

Electrical Shock or Equipment Damage Hazard.

Can shock individuals or short equipment

circuitry.

Disconnect power supply before installation.

The sensor assembly, see Fig. 1, consists of a stainless steel

sensor probe with an attached flange that can be mounted on

a flat duct or plenum surface using the type of screws

appropriate for the duct or plenum material. It can also be

mounted in a standard utility conduit box, 2 by 4 in. (51 by

102 mm) using No. 8 (4 mm) screws, see Fig. 2.

Location

The sensor should be located in the air duct or plenum where

it will sample an average air temperature. Avoid locations

where air stratification can cause sensing errors.

Mounting

See Fig. 2 for mounting a sensor on a flat duct or plenum

surface:

1. Cut a 3/8 in. (9.5 mm) hole in the duct or plenum surface

at the desired location.

2. Insert the sensor probe into the duct or plenum until the

flange rests against the duct or plenum wall.

3. If necessary, use the flange as a template to mark and

drill two holes for the No. 8 (4 mm) mounting screws.

4. Fasten the sensor to the duct or plenum surface with

two No. 8 (4 mm) sheet metal screws (not provided).

See Fig. 3 for mounting a sensor in a standard utility conduit

box:

1. Cut a 3/8 in. (9.5 mm) hole in the duct or plenum surface

at the desired location.

2. Remove the center knockout at the rear of the standard

utility conduit box. Insert the sensing probe through the

knockout with the flange flat against the box.

3. Using the flange as a template, mark and drill two holes

in the standard utility conduit box and the duct or

plenum surface for No. 8 (4 mm) mounting screws.

4. Insert the sensor probe through both the standard utility

conduit box knockout and the hole drilled in the duct or

plenum. Fasten the box and the sensor to the duct or

plenum surface with two No. 8 (4 mm) mounting screws

for sheet metal (not provided).

Fig. 1. C7770A/C7776A/C7778A Air Temperature Sensor

dimensions in in. (mm).

NOTES:

1. Sensor probe diameter is 1/4 in. (6 mm) on all

models.

2. 6 ft. plenum rated cable is standard on the

C7770A1040, C7776A1040, C7778A1040.

1/4 (6)

DIAMETER (2 HOLES)

M17961

(25)

3/4 (19)

1-1/2 (38)

2 (51) 1 (25)

1/16 (2)

6 (152)8 (203)

3/8 (9)

FITTING

NEOPRENE

GASKET

C7770A/C7776A/C7778A AIR TEMPERATURE SENSOR

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN 55422

customer.honeywell.com

® U.S. Registered Trademark

95-7557—04 M.S. Rev. 07-11

Printed in U.S.A.

Wiring

CAUTION

Electrical Shock or Equipment Damage Hazard.

Can shock individuals or short equipment

circuitry.

Disconnect power supply before installation.

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

1. All wiring must agree with applicable codes,

ordinances and regulations.

2. Do not mount sensor in incorrect environment.

3. Wire according to the applicable controller

instructions.

4. Erratic temperature readings from a sensor can be

caused by improper wiring practices. These must

be avoided to assure proper operation:

•Avoid poor wiring connections.

•Avoid intermittent or missing building earth ground.

•Do not mount sensor in incorrect environment.

Connect the low voltage wiring from the sensor to the

appropriate controller terminals using wirenut connectors (not

provided) as shown in Fig. 2 and 3.

Fig. 2. Mounting C7770A/C7776A/C7778A Air Temperature

Sensor on duct or plenum.

Fig. 3. Mounting C7770A/C7776A/C7778A Air Temperature

Sensor in a standard conduit box.

SENSOR

PROBE

SYSTEM DUCT

OR PLENUM

FLANGE

NO. 8 (4mm)

MOUNTING SCREWS

(NOT PROVIDED)

APPROPRIATE

SYSTEM

COMPONENTS CONNECT SENSOR

WIRES WITH TWO

WIRENUT CONNECTORS

(NOT PROVIDED)

M17962

SENSOR

PROBE

SYSTEM

DUCT OR

PLENUM

FLANGE

STANDARD UTILITY

CONDUIT BOX

CONNECTOR

LOCKNUT

AND

CONDUIT

BLANK

FACEPLATE

(OPTIONAL)

TO APPROPRIATE

SYSTEM

COMPONENTS

CONNECT SENSOR WIRES

WITH TWO WIRENUT

CONNECTORS (NOT PROVIDED)

M17963

NO. 8 (4mm)

MOUNTING

SCREWS (NOT

PROVIDED)

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