3
and indoor blower will both cycle on and
off to maintain the indoor temperature at
the desired heating level.
NOTE: If the thermostat temperature level
is re-adjusted, or the thermostat system
switch is repositioned, the outdoor unit
may not start immediately. The outdoor unit
contains a protective timer circuit which
holds the unit off for approximately five
minutes following a previous operation,
or the interruption of the main electrical
power.
Emergency Heat:
The thermostat includes a system switch
position termed EM. HT. This is a back-up
heating mode to be used only if there is
a suspected problem with the outdoor
unit. With the system switch set to EM.
HT. the outdoor unit will be locked off,
and supplemental heat (typically 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, and the compressor
will continue to run and heat the outdoor
coil, causing the snow and ice to melt.
After the snow and ice have melted, some
steam may rise from the outdoor unit as
the warm coil causes some melted frost to
evaporate.
Figure 1. Typical Thermostat
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 to the
desired temperature level using the tem-
perature selector. Please refer to the sepa-
rate detailed thermostat user’s manual for
complete instructions regarding thermostat
programming. The outdoor unit and indoor
blower will both cycle on and off to maintain
the indoor temperature at the desired cool-
ing level.
NOTE: If the thermostat temperature level
is re-adjusted, or the thermostat system
switch is repositioned, the outdoor unit
may not start immediately. The outdoor unit
contains a protective timer circuit which
holds the unit off for approximately five
minutes following a previous operation,
or the interruption of the main electrical
power.
TO OPERATE YOUR HEAT PUMP
FOR HEATING —
1. Set the thermostat system switch to HEAT
and the thermostat fan switch to AUTO.
(See Figure 1)
2. Set the thermostat temperature to the
desired temperature level using the
temperature selector. Please refer to
the separate detailed thermostat user’s
manual for complete instructions regarding
thermostat programming. The outdoor unit
TEMPERATURE
SENSOR
FAN
SWITCH
SYSTEM
MODE
