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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 TEMPERA
TURE
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.
