Installation Instructions 19
059840‐00 Rev. A
Heat‐Timer Corp.
Wiring the Outdoor Temperature Sensor
NOTES:
• Use only the provided Heat‐Timer temperature sensor (p/n 904220‐00).
• For acceptable sensor locations, see “Outdoor Temperature Sensor” on page 8.
1. Run the Outdoor Temperature Sensor wires through a knockout located on the bottom of
the EPU‐D enclosure.
NOTE: The sensor wires can be extended up to 500 feet (152.5 meters) using an 18 AWG
shielded 2‐conductor cable (Heat‐Timer p/n 703001‐01 or equivalent #18/2 cable).
2. Connect the Outdoor Temperature Sensor wires to terminals 11 and 12 on the EPU‐D.
3. Connect the shield to terminal 12 on the EPU‐D.
NOTE: Do not connect the shield at the sensor end.
Wiring the Optional Remote Shutdown / TSTAT
1. Run the Remote Shutdown wires through a knockout located on the bottom of the EPU‐D
enclosure.
2. Connect the Remote Shutdown dry‐contact wires to terminals 17 and 18 on the EPU‐D.
NOTE: The terminals can be configured as normally‐open or normally‐closed. If connected to
a remote shutdown, the terminals need an “open” signal. If connected to a TSTAT, the
terminals need a “closed” (short) signal.
Powering‐On the EPU‐D
1. Apply power to the EPU‐D.
2. Place the PRGM / RUN switch (1) on the EPU‐D in the
PRGM
position.
3. Perform initial programming of the EPU‐D (see “Initial Programming of the EPU‐D” on page 20).
Completing the Installation
After the EPU‐D is powered‐on and the initial programming is complete:
1. Place the PRGM / RUN switch (1) on the EPU‐D in the
RUN
position.
2. Replace the EPU‐D enclosure wiring cover and secure it in place with two screws.
3. Optionally secure the enclosure using a padlock with a maximum shank diameter of ⅛".
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