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21 68-0173—3
Fig. 25. Typical location for C7189A Remote Sensor (C7189A must be
mounted in living space and not in return air duct).
Wiring the C7189A Remote Sensor
(if needed)
CAUTION
Failure to follow these wiring practices can
introduce electrical interference (noise), which can
cause erratic system operation.
Keep wiring at least one foot away from large inductive
loads such as motors, line starters, lightning ballasts,
and large power distribution panels. Use shielded
cable to reduce interference if rerouting wire is not
possible. Ground the shielded cable to the ground
terminal on the W8900A-C.
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 if rerouting of sensor wiring is
not possible.
— Do not route temperature sensor wiring with building
power wiring, next to control contactors or near light
dimming circuits, electric motors or welding equip-
ment.
— Avoid poor wiring connections.
— Avoid intermittent or missing building earth ground.
CAUTION
Disconnect power supply before connecting to
wiring to prevent electrical shock or equipment
damage.
Wiring must comply with applicable codes, ordinances and
regulations.
1. Wire the C7189A Remote Indoor Sensor to the
W8900A-C Remote Module terminals S1 and S. For an
example of general wiring of the C7189A, see Fig. 26.
2. Push excess wire back into the hole. Plug the hole with
nonhardening caulk, putty or insulation to prevent drafts
from affecting the C7189A and PC8900A performance.
3. Remove the C7189A Cover.
4. Mount the C7189A on the wall or junction box using the
screws and anchors provided.
5. Level the C7189A for appearance only. The device
functions properly even when not level.
6. Install the C7189A Cover.
5 FEET
(1.5 METERS)
YES
NO
NO
NO
M4476