12 EPU‐D Installation and Operation Manual
059840‐00 Rev. A
Heat‐Timer Corp.
Outdoor Temperature Sensor Installation
Consider the following when installing the outdoor temperature sensor:
• Only use the sensor provided with the control.
• Locate the sensor in the shade on the north side of the
building. The sensor should never be in direct sunlight.
• Be sure the location is away from doors, windows, exhaust
fans, vents, or other possible heat or cold sources.
• The sensor should be mounted approximately 10 feet
(3 meters) above ground level.
• Adhere the provided outdoor label to the back of the sensor
base.
• Use the enclosure base bottom knockout for the conduit. Use
the locknut to hold the conduit and enclosure base together.
Screw the cover to the base.
• Make sure to seal around the sensor enclosure and wall,
except from the bottom of the enclosure.
• The sensor wires can be extended up to 500 feet (152.4
meters) using shielded 2‐conductor (#18/2) cable (Heat Timer
p/n 703001‐01).
• Do not connect the shield at the sensor. However, connect the shield at the control. See “Wiring the
Outdoor Temperature Sensor” on page 19.
CAUTION
Determining the proper location for the outdoor sensor is very important. The EPU‐D bases the
heat on the outdoor temperature information it receives from this location. If the sensor is in
the sun or covered with ice, its reading will differ from the actual outdoor temperature.
