ERM5220R EQUIPMENT REMOTE MODULE
29 33-00205—01
Electrical Interference (Noise) Hazard.
Can cause erratic system operation.Keep wiring at
least one foot away from large inductive loads such
as motors, line starters, lighting ballasts and large
power distribution panels.
Use shielded cable to reduce interference when
rerouting is not possible.
IMPORTANT
Erratic temperature readings from a sensor can
occur as a result of any of the wiring practices
described below. Avoid these practices to assure
correct operation. Use shielded cable to reduce
interference if rerouting of sensor wiringis not
possible.
• Be sure wires have a cable separate from the
thermostat cable.
• Do not route temperature sensor wiring with
building power wiring, next to control
contactors or near light dimming circuits,
electric motors or welding equipment.
• Avoid poor wiring connections.
• Avoid intermittent or missing building earth
ground.
Wiring the C7089U outdoor sensor
In most cases, shielded cable is not required and 18 gauge
copper wire can be used. Wire the sensor to the two S1
terminals on the ERM5220R.
NOTE: Never wire the same sensor in parallel to two
devices. If there are two units with separate
ERM5220R modules, each would need a separate
sensor.
Location and Mounting
Mount the sensor where:
• People cannot tamper with settings.
• There is good air circulation.
• It can measure true outdoor ambient temperature.
•The surface is flat.
• The wire distance between C7089 and thermostat is less
than 200 feet.
Do not mount the sensor:
• In direct sunlight.
• Where hot or cold air blows on the sensor.
• Discharge line from an outdoor compressor unit, vent or
fan causes 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 location selected formounting
the sensor mounting clip.
3. Mount the clip.
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