Honeywell C7046A, C7046B, C7046C, C7046D Data Sheet

Air Temperature Sensors

APPLICATION

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

C7046A,B,C,D

PRODUCT DATA

FEATURES

• C7046A,C Sensors have probe lengths of 8 in.
(203 mm) and nominal sensor resistance of 3000 ohms
at 77°F (25°C).

• C7046B Sensor has probe length of 6 in. (152 mm) and
nominal sensor resistance of 22,800 ohms at 77°F (25°C).

• C7046D Sensor has probe length of 8 in. (203 mm) and
nominal sensor resistance of 1097 ohms at 77°F (25°C).

• Carbon type, negative temperature coefficient
(NTC) thermistor sensing element in the C7046A,B,C
and platinum thin film, positive temperature coefficient
(PTC) element in C7046D precisely measures
temperature changes.

• No settings or calibration required.

• Solid state components not affected by dust or dirt.

• Fast reacting.

• Rugged stainless steel insertion probe.

• Mounts on duct or plenum surface with mounting
flange or in a 2 in. by 4 in. (51 by 102 mm) junction box.

• C7046B can be used as a replacement for C7100B
Averaging Temperature Sensor where duct or plenum
cross section is less than 13 in. (330 mm).

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

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 2

Ordering Information ........................................................ 2

Installation ........................................................................ 3

Wiring ............................................................................... 4

Operation and Checkout .................................................. 5

60-2350—8

C7046A,B,C,D AIR TEMPERATURE SENSORS

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SPECIFICATIONS

IMPORTANT

Specifications given in this publication do not include
normal manufacturing tolerances. Therefore, this unit
may not exactly match the listed specifications. Also,
this product is tested and calibrated under closely
controlled conditions and some minor differences in
performance can be expected if those conditions are
changed.

Models:

C7046A Air Temperature Sensor: Intended for use as a

discharge sensor with the W973 Single Zone Logic Panel.

C7046B Air Temperature Sensor: Intended for use as a zone

discharge, hot deck, cold deck, mixed air and/or return air
sensor in the W7080 Multizone Control System.

C7046C Air Temperature Sensor: Intended for use as a

discharge sensor in rooftop applications.

C7046D Air Temperature Sensor: Intended for use as a

discharge air sensor in the Excel 500 Control System.

Dimensions: See Fig. 1.

Mounting: Integral mounting flange requiring two No. 8 screws.

Sensing Element:

C7046A,B,C: Carbon type, thermistor-resistor element.
C7046D: Platinum thin film element.

Maximum Ambient Temperature: 250°F (121°C).

Operating Temperature Range: 40 to 150°F (4 to 66°C).

Wiring Connections: 6 in. (152 mm) leadwires.

Performance Characteristics:

Reaction Time Constant with Air Approach Velocity of

500 ft/min (2 m/sec):
C7046A: 100 seconds.
C7046B: 165 seconds.
C7046C: 60 seconds.
C7046D: 130 seconds.

Resistance/Temperature (NTC):

C7046A,C:

Nominal Resistance: 3000 ohms at 77°F (25°C)
Nominal Sensitivity: 70 ohms per degree F (124 ohms
per degree C) at midrange.

C7046B:

Nominal Resistance: 22,800 ohms at 77°F (25°C).
Nominal Sensitivity: 675 ohms per degree F (1290 ohms
per degree C) at midrange.

C7046D:

Nominal Resistance: 1097 ohms at 77°F (25°C).
Nominal Sensitivity: 2.1 ohms per degree F (3.9 ohms
per degree C).

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

Sensor dimensions in in. (mm).

M224

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

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:

1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

60-2350—8 2

INSTALLATION

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C7046A,B,C,D AIR TEMPERATURE SENSORS

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.

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

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.

SYSTEM DUCT
OR PLENUM

NO. 8 (4mm
MOUNTING SCREW

R

PR

T
APPROPRIAT

NENT

M224

NOT PROVIDED

FLAN

NNECT SENSOR
IRES WITH TW
IRENUT CONNECTOR

NOT PROVIDED

Fig. 2. Mounting C7046 Air Temperature

Sensor on a flat duct or plenum surface.

TANDARD UTILIT

IT B

PROB

FLAN

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NO. 8 (4mm)
MOUNTING
SCREWS (NOT

ROVIDED

Mounting on a 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.

NNECT

LOCKNUT

TO APPROPRIATE

TEM

NENT

TEM
DUCT OR
PLEN

NNECT SENSOR WIRE
WITH TWO WIRENUT
CONNECTORS

Fig. 3. Mounting C7046 Air Temperature

Sensor in a junction box.

FACEPLAT

OPTIONAL

NOT PROVIDED

3 60-2350—8