Pentax C7089A Owner's Manual

C7089A Outdoor Sensor

INSTALLATION INSTRUCTIONS

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 tempera­ture 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.

SPECIFICA TIONS

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

INST ALLA TION

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.

CA UTION

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.

Do

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:

1 Remove the sensor from the mounting clip.
2 Mark the area on the surface where the C7089

mounting clip will be mounted.

3 Mount the clip.

®U.S. Registered Trademark
Copyright © 1995 Honeywell Inc. • All Rights Reserved

X-XX UL

69-0896-1

C7089 OUTDOOR SENSOR

CA UTION

Disconnect the power supply before connecting
the wiring to prevent electrical shock or equipment
damage.

Wiring must comply with applicable codes, ordinances and
regulations.

1 Wire 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.

2 Mount the C7089 in its mounting clip.
3 Plug wiring hole using nonhardening caulk or putty.

Fig. 1. Typical locations for outdoor sensor.

Wiring

CA UTION

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.

M7514

1

C7089

W8900

OUT
OUT

GND

1

USE APPROPRIATE MOUNTING MEANS FOR THE TYPE
OF STRUCTURE.

2

PLUG WIRING HOLE WITH NONHARDENING CAULK OR PUTTY.
IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL

3

ON W8900.

LED

WIRING HOLE
THROUGH

2

STRUCTURE

3

M4457

69-0896—1 2

Fig. 2. Wiring diagram for the C7089 Outdoor Sensor

to the W8900 Remote Module.