Heat Pumps and Energy Savings

Heat Pump Operation - Zoneline 5500 Series

Heat sources: Heat pump, heat pump and simultaneous electric resistance heat, or electric resistance heat

The Zoneline 5500 Series 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 5500 series is designed to help insure 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 energy saving level without inconveniencing the room occupant. Once the thermostat has been satisfied, the resistance heater will turn off and the heat pump will operate as shown in Zoneline 5500 Series Heat Source Logic chart when the thermostat calls for heat again. The unit will operate in this manner even if connected to a Central Desk Control.

Zoneline 5500 Series Heat Source Logic

ROOM

 

 

 

TEMPERATURE

 

 

 

VS. THERMOSTAT

Above 46°F.

Between 46°F.

Below 25°F.

SET POINT

 

and 25°F.

 

Less Than 1.8°F.

Heat Pump

Heat Pump*

Full Resistance

Below

 

 

Heat

 

 

 

 

1.8°F to 2.7°F.

Heat Pump

Heat Pump +

Full Resistance

Below

 

Supplemental

Heat

 

 

Heater

 

 

 

 

 

More than 2.7°F.

Heat Pump

Full Resistance

Full Resistance

Below

 

Heat

Heat

 

 

 

 

*If the “Temperature Boost” switch (dip switch #8) is in the “ON” position, the supplemental simultaneous heater will be used with heat pump operation. Simultaneous supplemental heater: 1.0 KW @ 230 V; 0.8 KW @ 208 V; 1.7 KW @ 265 V

The “Temperature Boost” option utilizes the supplemental simultaneous heater simultaneously with 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 Zoneline 5500 series 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 Zoneline 5500 Series Heat Source Logic shown in the chart above. 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 42 - 43 for information on the power connection kits and available heater capacities.

A heat pump override switch is provided in the auxiliary controls 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 5500 Series

The Zoneline 5500 Series has a reverse cycle demand defrost system to extend heat pump operation and increase savings from extended operation. The microprocessor 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 build-up. Before and after the reverse cycle defrosting, the unit shuts off the compressor to allow the refrigerant pressures 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 insure room comfort conditions during the defrost cycle. The unit remains in the defrost cycle for a minimum of 2 minutes up to a maximum of 9 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 5500 Series heat pump may be ordered with a factory installed Internal Condensate Removal (ICR) system to minimize the amount of condensate water draining from the unit during heat pump operation.

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GE manual Heat pump defrost Zoneline 5500 Series, Heat Pump Operation Zoneline 5500 Series

5500 specifications

The GE 5500 is a sophisticated gas turbine that represents a benchmark in the realm of power generation technology. Known for its impressive performance and efficiency, the GE 5500 has garnered attention in various industries, particularly in energy production. Designed for combined-cycle applications, this turbine effectively leverages both gas and steam cycles to optimize electricity generation.

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