Heat Pumps and Energy Savings
Heat Pump Operation — Zoneline 6100 Series
Heat sources: Heat pump, heat pump and simultaneous electric resistance heat or electric resistance heat.
Zoneline heat pumps employ a highly featured microprocessor control system interfaced with thermistors to accurately measure indoor air temperature, outdoor air temperature, indoor coil temperature and outdoor coil temperature. This system allows the microprocessor to precisely and predictably react to changing conditions in order to provide a very advanced packaged terminal heat pump operating system.
The Zoneline heat pumps are designed to help ensure a comfortable room. When “HEAT” is selected, the unit will determine if the room air is warm enough to satisfy the thermostat setting. If the temperature at the unit sensor is below the desired temperature, the electric resistance heater will be utilized to warm the room to the point where the thermostat is satisfied. This feature is designed to allow the temperature of an unoccupied room to be maintained at an
Zoneline Heat Pump Heat Source Logic
ROOM |
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TEMPERATURE | Above | Between 46°F | ||
25°F | ||||
VS. THERMOSTAT | 46°F | and 25°F | ||
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SET POINT |
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Less Than | Heat Pump | Heat Pump* | Full Resistance | |
1.8°F Below | Heat | |||
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1.8°F to 2.7°F |
| Heat Pump + | Full Resistance | |
Heat Pump | Supplemental | |||
Below | Heat | |||
| Heater | |||
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More than 2.7°F | Heat Pump | Full Resistance | Full Resistance | |
Below | Heat | Heat | ||
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The Boost Heat option utilizes the supplemental simultaneous heater at the same time as heat pump operation when the outdoor temperature is below 46°F regardless of the indoor air temperature**. The chart above indicates the heat source of the heat pump under various indoor and outdoor conditions. The unit is designed to provide heat pump savings without sacrificing room comfort.
The Quick Heat Recovery feature is not affected by the Heat Source Logic shown in the chart below. For more information about the Quick Heat Recovery Feature, see page 9. The full heat output of the resistance heater is dependent upon circuit amperage and the power connection kit used. See pages 3 and
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An option is provided in the auxiliary controls (Mode 8) to allow the unit to operate only in resistance heat. The use of this option significantly increases the cost for heating.
Heat pump defrost — Zoneline 6100 Series
Zoneline heat pumps utilize a
determines the need for defrosting by criteria based on continuous compressor running time, outdoor air temperature, outdoor coil temperature and the rate of temperature change of the outdoor coil. When defrosting
is required, the unit reverses the flow of refrigerant to direct the hot gas into the outdoor coil to melt the frost buildup. Before and after the
to equalize throughout the system. This eliminates the possibility of a loud reversing noise. During these periods of pressure equalization, the full resistance heat capacity of the unit is activated to help ensure room comfort conditions during the defrost cycle. The unit remains in the defrost cycle for a minimum of two minutes up to a maximum of nine minutes. The defrost cycle terminates when the outdoor coil reaches a temperature of 68°F or the maximum time has been reached.
Heat pump condensate
See page 34 for information on heat pump condensate. The Zoneline 6100 Series heat pumps may be ordered with a
Units with ICR may not be installed in seacoast or corrosive environment applications.
*If the Boost Heat switch (auxiliary setting #9) is “ON”, the supplemental simultaneous heater will be used with heat pump operation. Simultaneous supplemental heater: 1.0 KW @ 230 V; 0.8 KW @ 208V; 1.0 KW @ 265V.
**Boost Heat option only applies to systems controlled at the unit. Boost Heat option should NOT be used with remote thermostat operation since this will cause the unit to switch to resistance heat when outdoor temperatures are below 46°F.
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