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Heat Pump Application
Electric Auxiliary Heat
with Outdoor Temperature Sensor
S Installer set−up number 0170 −−
heat pump.
S Installer set−up number 0200 −−
back−up heat is electric.
S Installer set−up number 0340 −−
outdoor temperature sensor for
control option chosen.
S Installer set−up number 0350 −−
choose appropriate compressor
lock−out temperature.
S Installer set−up number 0360 −−
choose appropriate auxiliary lock−
out temperature.
NOTE − There is a minimum 5°F dead-
band between the compressor and
auxiliary heat lock−out temperatures.
Heating Mode Operation
When the outdoor temperature is be-
low the compressor lock−out tempera-
ture (balance point), only the auxiliary
heat operates.
When the outdoor temperature is
above the auxiliary lock−out tempera-
ture (balance point), only the compres-
sor operates.
When the outdoor temperature is be-
tween the two temperatures, both the
compressor and auxiliary heat oper-
ate.
COMPRESSOR
LOCK−OUT
TEMPERATURE
AUXILIARY
LOCK−OUT
TEMPERATURE
COMPRESSOR ONLY
BOTH COMPRESSOR AND
AUXILIARY HEAT
AUXILIARY ONLY
50
35
OUTDOOR TEMPERATURE
Emergency Heat Operation
When the thermostat is set for the
emergency heat mode, the compres-
sor and auxiliary lock−out features are
turned off. Compressor operation is
locked out. The first stage of heat be-
comes what is connected to the ther-
mostat E terminal. The second stage of
heat becomes what is connected to the
Aux. terminal.
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