Honeywell CT70 Wiring Manual page 9

FAN:
MULTIPLE AUX.
HEAT LOADS:
OUTDOOR
SENSOR:
OUTDOOR STAT:
POWER:
COMMON:
SYSTEM MONITOR:
When this terminal is activated, the fan is
on. With the fan switch in the auto
position, the fan cycles on and off with the
heat pump. With the fan switch in the ON
position, the fan is
on continuously.
This terminal is activated when additional
auxiliary heat loads are required. Because
the CT70 only has provisions for one
auxiliary heat load, these loads must be
connected to the AUXILIARY HEAT
terminal.
This terminal is not connected to the
CT70. On your original thermostat, this
terminal was activated by an outdoor
sensor that controlled the auxiliary heat
source.
Outdoor Thermostat. This terminal is
activated when the system switch is in the
EM. HT. position. The outdoor thermostat
controls the amount of auxiliary heat that
is activated.
This terminal connects to the power side
of the 24-volt transformer.
This terminal connects to the common
side of the 24-volt transformer.
Some heat pumps have the ability to
indicate when the heat pump is
malfunctioning. When this occurs, this
terminal is activated and the EM. HT. LED
is activated.
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