Honeywell Tradeline C7089A User manual

X-XX UL

INSTALLATION INSTRUCTIONS

®U.S. Registered Trademark

APPLICATION

The C7089 Outdoor Sensor is used with the PC8900

Perfect Climate Comfort Center™ Control System and the

W8900 Remote Module. It senses the outdoor tempera-

ture for display on the PC8900 at the touch of a key. The

sensor is encapsulated to protect against water and

contaminants, and includes 60 in. leadwires.

SPECIFICATIONS

Operating Ambient Temperature Range:

-40 to 128°F (-40 to 53°C)

Operating Relative Humidity:

5% to 95% noncondensing

Dimensions in inches (millimeters):

2-1/4 (57) x 3/8 (10) with 60 (1524) leadwires

C7089A Outdoor Sensor

INSTALLATION

When Installing this Product…

1Read these instructions carefully. Failure to follow

them could damage the product or cause a hazard-

ous condition.

2Check the ratings given in the instructions and on

the product to make sure the product is suitable for

your application.

3Installer must be a trained, experienced service

technician.

4After installation is complete, check out product

operation as provided in these instructions.

CAUTION

Disconnect power supply before connecting wiring

to prevent electrical shock or equipment damage.

Location and Mounting (Fig. 1)

Mount the sensor where:

• setting can not be tampered with.

• there is good air circulation.

• it can measure the true outdoor ambient

temperature.

• surface is flat.

• the wire distance between the C7089 and W8900 is

less than 200 feet.

not

mount the sensor:

• in the direct sunlight.

• where hot or cold air blows on the sensor. Discharge

line from an outdoor compressor unit, vent or fan will

cause inaccurate temperature readings.

• where snow, ice or debris can cover it.

Use the following steps to mount the sensor:

1Remove the sensor from the mounting clip.

2Mark the area on the surface where the C7089

mounting clip will be mounted.

3Mount the clip.

69-0896-1

69-0896—1 2

C7089 OUTDOOR SENSOR

Fig. 1. Typical locations for outdoor sensor.

Wiring

CAUTION

Keep wiring at least one foot away from large

inductive loads such as motors, line starters,

lightning ballasts, and large power distribution

panels. Failure to follow these wiring practices can

introduce electrical interference (noise), which can

cause erratic system operation. Use shielded cable

to reduce interference when rerouting is not

possible. Ground the shielded cable to the GND

terminal on the W8900.

IMPORTANT

Erratic temperature readings from a sensor can

occur as a result of any of the wiring practices

described below. These practices must be

avoided to assure proper operation. Use shielded

cable to reduce interference when rerouting of

sensor wiring is not possible.

a. Do not route temperature sensor wiring with

building power wiring, next to control

contactors or near light dimming circuits,

electric motors or welding equipment.

b. Avoid poor wiring connections.

c. Avoid intermittent or missing building earth

ground.

CAUTION

Disconnect the power supply before connecting

the wiring to prevent electrical shock or equipment

damage.

Wiring must comply with applicable codes, ordinances and

regulations.

1Wire the C7089 Outdoor Sensor to the terminals

marked OUT on the W8900 Remote Module. If the

leadwire provided with the C7089 is not long

enough, run cable to a hole at the selected C7089

location. Color-coded, 18-gauge thermostat wire is

recommended. For an example of general wiring of

the C7089, see Fig. 2. Pigtail wiring can be used.

2Mount the C7089 in its mounting clip.

3Plug wiring hole using nonhardening caulk or putty.

M7514

Fig. 2. Wiring diagram for the C7089 Outdoor Sensor

to the W8900 Remote Module.

M4457

USE APPROPRIATE MOUNTING MEANS FOR THE TYPE

OF STRUCTURE.

PLUG WIRING HOLE WITH NONHARDENING CAULK OR PUTTY.

IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL

ON W8900.

C7089

WIRING HOLE

THROUGH

STRUCTURE

OUT

LED

GND

W8900

69-0896—13

C7089 OUTDOOR SENSOR

OPERATION

The C7089 Outdoor Sensor converts outdoor ambient

temperature to a resistance that the W8900 Remote

Module can interpret. The W8900 Remote Module in turn

sends a signal to the PC8900 where the outdoor tempera-

ture is displayed when the CHECK key is pressed. The

C7089 has a positive temperature coefficient (PTC), which

means that the resistance increases as the temperature

increases. Fig. 3 shows the resistance characteristics of

the C7089 Sensor.

OHM RESISTANCE

°F

(°C )

M6358

RESISTANCE INCREASES 4.84 OHMS PER 1°F CHANGE OR 8.7 OHMS PER 1°C CHANGE.

3800

3900

3700

3300

3400

3500

3600

3200

TEMPERATURE

-40

(-40) -20

(-29) 0

(-18) 20

(-7) 40

(5) 60

(16) 80

(27)

3100

2900

3000

2800 100

(38) 120

(49) 140

(60) 160

(79)

-40

-35

-30

-25

-20

-15

-10

-5

100

105

110

115

120

130

135

140

145

150

-40.0

-37.2

-34.4

-31.7

-28.9

-26.1

-23.3

-20.6

-17.8

-15.0

-12.2

-9.4

-6.7

-3.9

-1.1

1.7

4.4

7.2

10.0

12.8

15.6

18.3

21.1

23.9

26.7

29.4

32.2

35.0

37.8

40.6

43.3

46.1

48.9

51.7

54.4

57.2

60.0

62.8

65.6

2929 to 2905

2953 to 2929

2978 to 2953

3002 to 2978

3026 to 3002

3050 to 3026

3074 to 3050

3099 to 3074

3123 to 3099

3147 to 3123

3171 to 3147

3195 to 3171

3220 to 3195

3244 to 3220

3268 to 3244

3292 to 3268

3316 to 3292

3341 to 3316

3365 to 3341

3389 to 3365

3413 to 3389

3437 to 3413

3462 to 3437

3486 to 3462

3510 to 3486

3534 to 3510

3558 to 3534

3583 to 3558

3607 to 3582

3631 to 3607

3655 to 3631

3679 to 3655

3703 to 3679

3728 to 3703

3752 to 3728

3776 to 3752

3800 to 3776

3824 to 3800

3849 to 3824

OUTDOOR TEMPERATURE OHMS OF

RESISTANCE

°F °C

Fig. 3. C7089A sensor resistance vs. temperature performance characteristics.

69-0896—1 4

C7089 OUTDOOR SENSOR

Home and Building Control

Honeywell Limited-Honeywell Limitée

740 Ellesmere Road

Scarborough, Ontario

M1P 2V9

69-0896—1 J.H. Rev. 6-95 Printed in Mexico

CHECKOUT

Allow the C7089 Outdoor Sensor to soak in the outdoor air

for a minimum of five minutes before taking a reading.

With an accurate thermometer (±1°F [0.5°C]), measure the

temperature at the sensor location, allowing time for the

thermometer to stabilize before reading. Press the CHECK

key on the PC8900 until the display shows OUT followed

by the temperature reading. See Fig. 4. The PC8900

reading should match the reading taken outdoors.

To verify the resistance of the sensor, remove one wire

from one of the C7089 wiring terminals. Use an ohmmeter

to measure the resistance across the sensor. Then verify

sensor accuracy with the temperature/resistance curve of

Fig. 3.

CALIBRATION

The C7089 Outdoor Sensor is calibrated in the factory and

cannot be recalibrated in the field.

CHECK

SYSTEM

PC8900

M7515

Fig. 4. Outdoor temperature display on the PC8900.

Home and Building Control

Honeywell Inc.

1985 Douglas Drive

Golden Valley, MN 55422

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