Nordyne Q4 Series Operating Instructions, Specifications, To Operate Your Heat Pump For Cooling

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.

FAN SWITCH

TEMPERATURE SELECTOR

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.

Cooling	Furance
Thermostat	Thermostat
R	R

Double Throw

Double Pole Switch

To Heat Pump To Furance

Figure 2. Thermostat Interlock System

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