Honeywell C7046C Manuel d'utilisation

PRODUCT DATA

® U.S. Registered Trademark

C7046A,B,C,D

Air Temperature Sensors

APPLICATION

The C7046 series of Air Temperature Sensors function as

primary and/or secondary sensors in electronic control

systems.

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).

Contents

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

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

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

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

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

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

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

C7046A,B,C,D AIR TEMPERATURE SENSORS

60-2350—8 2

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, 35 Dynamic Drive, 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.

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).

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

Sensor dimensions in in. (mm).

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

1/4

(

)

IAMETER

(

2 HOLES

)

M224

(

)

3/4

(

)

1-1/2

(

)

(

)

(

)

1/16

(

)

(

152

)

(

203

)

PRENE

5/16

(

)

DIAMETE

(

BUSHING

)

KIN

USH

NUTS

(

)

PLA

BUS

HIN

C7046A,B,C,D AIR TEMPERATURE SENSORS

3 60-2350—8

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.

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 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.

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.

Fig. 2. Mounting C7046 Air Temperature

Sensor on a flat duct or plenum surface.

Fig. 3. Mounting C7046 Air Temperature

Sensor in a junction box.

SYSTEM DUCT

OR PLENUM

FLAN

NO. 8

(

4mm

)

NTIN

REW

(

NOT PROVIDED

)

APPR

PRIAT

NENT

NNE

IRE

WITH TW

IREN

NNE

(

NOT PROVIDED

)

M224

TEM

PLEN

FLAN

TANDARD

TILIT

IT B

NNE

AND

BLANK

EPLAT

(

OPTIONAL

)

APPR

PRIATE

TEM

NENT

NNE

R WIRE

WITH TW

WIREN

CONNECTORS

(

NOT PROVIDED

)

NO. 8 (4mm)

MOUNTING

SCREWS (NOT

ROVIDED

)

C7046A,B,C,D AIR TEMPERATURE SENSORS

60-2350—8 4

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 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.

Fig. 4. Connecting C7046A Air Temperature

Sensor to a W973 Single Zone Logic Panel.

Fig. 5. Connecting C7046B Air Temperature Sensor

for mixed air, cold deck and hot deck sensing, zone

discharge and optional remote return air sensing

in W7080 Multizone System.

Fig. 6. Connecting C7046D Air Temperature

Sensor to Excel 500 Control System.

TT134251TRTRWBYR

SENSOR STAT 24 VAC ECONO

C +20 H N

C7046A

(HOT)

W973 LOGIC PANEL

M17965

POWER SUPPLY. PROVIDE DISCONNECT

MEANS AND OVERLOAD PROTECTION

AS REQUIRED.

M17966

C7046B

(OR C7100B)

MIXED AIR

SENSOR

C7046B

(OR C7100B)

COLD DECK

SENSOR

C7046B

(OR C7100B)

HOT DECK

SENSOR

HOT DECK HIGH LIMIT–A7

3456

110

130 NO JUMPER

24 Vdc

W7081

LIMIT CONTROLLER

COLD DECK LOW LIMIT–A6

3456

55 NO JUMPER

ECONOMIZER/MIXED AIR LOW LIMIT–A5

3456

60 NO JUMPER

+24 VDC

–+

T7080A,B C7046B

(OR C7100B)

ZONE (N)

DISCHARGE

SENSOR

C7046B

(OR C7100B)

REMOTE

RETURN

AIR SENSOR

(IF USED)

C7100B AVERAGING

TEMPERATURE SENSOR

MAY BE SUBSTITUTED IF

SPACE PERMITS.

REMOTE RETURN AIR SENSOR

USED WITH T7080B ONLY.

AI 1

AI 2

AI 3

AI 4

AI 5

AI 6

AI 7

AI 8

C7046D XF521A/XF526

M2825

C7046A,B,C,D AIR TEMPERATURE SENSORS

5 60-2350—8

OPERATION AND CHECKOUT

Operation

The C7046A,B,C Air Temperature Sensors consist of a

thermistor sensing element mounted in a tubular probe. They

are applied at various locations throughout single zone and

multizone duct systems. The negative temperature coefficient

(NTC) characteristic of the thermistor element causes its

resistance to decrease as the sampled air temperature

increases. This resistance shift is balanced with other system

sensor signals by appropriate system logic panels to stabilize

system control.

The C7046D Air Temperature Sensor consists of a platinum

thin film sensor element mounted in a tubular probe. It can be

applied at various locations throughout single zone and

multizone duct systems. The positive temperature coefficient

(PTC) characteristics of the platinum thin film element causes

its resistance to increase as the sampled air temperature

increases. This resistance shift is balanced with other system

sensor signals by the Excel 500 Control System.

Checkout

Allow the C7046 Air Temperature Sensor to soak in the air

moving through the duct or plenum for a minimum of five

minutes before taking a resistance measurement.

1. Disconnect the sensor leadwires from the associated

system components.

2. Connect an ohmmeter across the leadwires.

3. Assure nominal resistance measurements are in

accordance with the resistance/temperature curves

shown in Figs. 7, 8 and 9.

4. Reconnect sensor leadwires to associated system

components.

5. Check operation of the complete control system.

Fig. 7. C7046A,C Sensor resistance vs. temperature.

Fig. 8. C7046B Sensor resistance vs. temperature.

Fig. 9. C7046D Sensor resistance vs. temperature.

4000

3000

2000

1000

8000

7000

6000

5000

12000

11000

10000

9000

16000

17000

15000

14000

13000

605040 70 8010 20 30 90 100

15 2010 25-5 0-10 530 35

RESISTANCE (OHMS)

TEMPERATURE (DEGREES)

M17969

3,000 OHMS

AT 77 F (25 C)

120000

100000

80000

60000

40000

20000

020 40 60 80 100 120 140

30 50 70 90 110 130

RESISTANCE (OHMS)

TEMPERATURE (DEGREES)

M17973

0 10 20 30 40 C

-7 50 60

5 15 25

35 45 55

22,800 OHMS AT

77 F (25 C)

1159

1141

1126

1111

1096

1081

1066

1051

55 60 65 70 75 80 85 90 95 100 105

13 15 20 25 30 35 38 41

RESISTANCE

(OHMS)

TEMPERATURE (DEGREES)

M2826

1097 OHMS AT

77 F [25 C]

60-2350—8 6

7 60-2350—8

60-2350—8 B.B. Rev. 7-04 www.honeywell.com

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

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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