4
OPERATING INSTRUCTIONS
To Operate Your Heat Pump For Cooling —
1. Set the thermostat system switch to COOL
and the thermostat fan switch to AUTO.
See
Figure 1.
2. Set the thermostat temperature selector to the
desired cooling temperature. The outdoor unit
fan, the indoor blower, and the compressor
will all cycle on and off to maintain the indoor
temperature at the desired cooling level.
NOTE: If the thermostat temperature level is
re-adjusted, or if the thermostat system switch
is re-positioned, the outdoor unit fan and the
compressor may not start immediately. A
protective timer circuit holds the compressor and
the outdoor fan off for approximately six minutes
following a previous operation or the interruption
of the main electric power
To Operate Your Heat Pump For Heating —
1. Set the thermostat system switch for HEAT
and the thermostat fan switch to AUTO.
See
Figure 1.
2. Set the thermostat temperature selector to the
desired heating temperature. The outdoor unit
fan, the indoor blower, and the compressor
will all cycle on and off to maintain the indoor
temperature at the desired heating level.
NOTE: If the thermostat temperature level is
re-adjusted, or if the thermostat system switch
is re-positioned, the outdoor unit fan and the
compressor may not start immediately. A
protective timer circuit holds the compressor and
the outdoor fan off for approximately six minutes
following a previous operation or the interruption
of the main electrical power.
Emergency Heat —
Some thermostats will
include a system switch position termed EM
HT or AUX HT, etc. This is a back-up heating
mode to be used only if there is a suspected
problem. With the system switch set to EM
HT, etc., the compressor and outdoor fan will
be locked off and supplemental heat (electric
resistance heating) will be used as a source of
heat. Sustained use of electric resistance heat in
place of the heat pump will result in an increase
in electric utility costs.
Defrost —
During cold weather heating operation,
the outdoor unit will develop a coating of snow
and ice on the heat transfer coil. This is normal
and the unit will periodically defrost itself. During
the defrost cycle, the outdoor fan will stop, while
the compressor continues to run and heat the
outdoor coil, causing the snow and ice to melt.
During defrost, there may be some steam rise
from the outdoor unit as the warm coil causes
some melted frost to evaporate.
Figure 2. Thermostat Interlock System
Cooling
Thermostat
Furnace
Thermostat
Double Throw
Double Pole Switch
To Air Conditioner
To Furnace
R
R
Figure 1. Typical Thermostat
FAN SWITCH
TEMPERATURE SELECTOR
