Nordyne Q4 Series - Manual (Page 4)

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 approx-imately 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.
Figure 1. Typical Thermostat
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.
SPECIFICATIONS
Model Series Q4 Single Package Heat Pumps
are designed for outdoor rooftop or ground level
slab installations. The units are shipped ready
for horizontal duct connections and are easily
converted for down flow applications.
Figure 2. Thermostat Interlock System
Cooling
Thermostat
Furance
Thermostat
Double Throw
Double Pole Switch
To Heat Pump To Furance
R R
FAN SWITCH
TEMPERATURE SELECTOR