Honeywell C7046A User Manual

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Air Temperature Sensors

INSTALLATION INSTRUCTIONS

APPLICATION

The C7046 series of Air Temperature Sensors function
as primary and/or secondary sensors in electronic control
systems.

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.

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 an
aluminum sensor probe (element housed internally) with
attached flange that can be mounted on a flat duct or
plenum surface, or in a 2 in. by 4 in. (51 by 102 mm)
junction box using two No. 8 screws. Connections to the
sensor are made through two 6 in. (152 mm) leadwires.

2 (51

/4 (19

5/16 (9) DIAMETE

(BUSHING

INSERTION LENGTH DEPENDS UPON THE MODEL.

1

Fig. 1. C7046A,B,C,D Air Temperature

Sensor dimensions in in. (mm).

8 (203

PLASTI

BUSHIN

LOCKING P

NUTS (2

1/4 (6

IAMETER (2 HOLES

1/16 (2

NEOPRENE

M22402

NOTE: Sensor probe diameter is 1/4 in. (6 mm).

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

Mounting on Flat Duct or Plenum Surface (Fig. 2)

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

2. Insert 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 No. 8 mounting screws.

4. Fasten the sensor to the duct or plenum surface
with two No. 8 sheet metal screws (not provided).

Mounting in a Junction Box (Fig. 3)

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

2. Remove the center rear knockout from the junction
box and insert the sensing probe through the
knockout with the flange flat against the outlet box.

3. Using the flange as a template, mark and drill two
holes in the junction box and the duct or plenum
surface for No. 8 mounting screws.

4. Insert sensor probe through both the junction box
knockout and the 3/8 in. (9.5 mm) hole drilled in the
duct or plenum and fasten the junction box and
sensor to the duct or plenum surface.

® U.S. Registered Trademark
Copyright © 2004 Honeywell International Inc. • All Rights Reserved

62-0216

C7046A,B,C,D AIR TEMPERATURE SENSORS

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SYS

COMPO

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CO

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PR

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APPROPRIAT

NENT

M22403

Fig. 2. Mounting C7046 Air Temperature
Sensor on a flat duct or plenum surface.

TANDARD UTILIT

IT B

LOCKNUT

TO APPROPRIATE

TEM

NENT

TEM

R

PLEN

Fig. 3. Mounting C7046 Air Temperature

Sensor in a junction box.

FLAN

R

PROB

NNECT SENSOR WIRE

ITH TWO WIRENUT

CONNECTORS (NOT PROVIDED

Wiring

CAUTION

Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or short equipment
circuitry.

Disconnect power supply before installation.

SYSTEM DUCT
OR PLENUM

NO. 8 (4mm
MOUNTING SCREW

NOT PROVIDED

FLAN

NNECT SENSOR
WIRES WITH TW
WIRENUT CONNECTOR

NOT PROVIDED

NO. 8 (4 mm)
MOUNTING

CREWS (NOT

PROVIDED

FACEPLAT

OPTIONAL

M22404

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 low voltage wiring from the sensor to the
appropriate system component terminals using
solderless connectors. See Fig. 3.

NOTES:

1. For connections to the W973 Single Zone

Logic Panel, see Fig. 4.

2. For connections to the W7080 Multizone

System, see Fig. 5.

3. For connections to the Excel 500 Control

System, see Fig. 6.

4. For additional wiring information, refer to the

appropriate specification.

W973 LOGIC PANEL

SENSOR STAT 24 VAC ECONO

C +20 H N

TT134251TRTRWBY

C7046A

1

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

Fig. 4. Connecting C7046A Air Temperature
Sensor to a W973 Single Zone Logic Panel.

1

L1

L2

(HOT)

R

M17965

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