GE 5500 Data Manual page 52

Additional specifications for GE Zoneline 3500 Series Packaged
Terminal Heat Pump (for 5500 series units use specifications
noted for 5500 series instead of these specifications).
Heat pump units shall automatically change from heat
pump operation to electric resistance heat when heat pump
operation is unable to produce sufficient heat to maintain
room temperature within 2.7°F. of thermostat set point, or
when the outdoor coil temperature falls below 9°F. -
approximately 25°F. outdoor temperature.
Heat pump unit shall automatically begin a passive defrost
cycle when the outdoor coil temperature drops below 9°F.
Defrosting shall be accomplished by natural defrost with unit
automatically reinitiating heat pump operation when
outdoor coil reaches 37°F.
Unit shall be equipped with a temperature activated drain
valve to allow water generated in heat pump operation and
defrost cycles to drain into wall case rather than being
deposited on outdoor coil.
Each time the heat mode is selected, or the unit is powered
up in the heat mode selection, the heat pump will use
electric resistance heat to bring room temperature to
selected thermostat set point. Heat pump operation will be
used on subsequent unit heating operation if the room
temperature is within 2.7°F of the set point and the unit is
not in the defrost cycle.
Unit shall have a switch concealed from room occupant to
allow heat pump operation to be overridden and heat
provided by electric resistance heat regardless of outdoor
temperature.
In the event of compressor failure during heat pump
operation, unit shall automatically switch to electric
resistance heat to maintain selected room temperature
regardless of outdoor temperatures.
Alternate specifications for GE Zoneline 5500 Series Packaged
Terminal Heat Pump (for 3500 series units use specifications
noted for 3500 series instead of these specifications).
Heat pump units shall provide operation that will either:
A) automatically phase in partial electric resistance heat, if
outdoor temperature is below 46°F., simultaneously with heat
pump if heat pump alone is unable to maintain room
temperature; or B) use partial electric resistance heat
simultaneous with heat pump operation any time the
outdoor temperature is below 45°F. Selection of A or B
operation is made by means of a selector switch concealed
from room occupant. In either A or B operation the unit will
switch to full resistance heat if room temperature continues
to decline or the outdoor temperature falls below 25°F. If the
outdoor temperature is above 46°F., unit will lock out electric
resistance heat and operate on heat pump only.
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Heat pump unit shall include Reverse Cycle Defrost that
automatically begins a defrost cycle when microprocessor
determines criteria for defrosting has been met. Defrosting
shall be accomplished by systematically ceasing heat pump
operation, pausing to allow internal refrigerant pressures to
equalize, then operating the compressor with the flow of
refrigerant reversed, to allow the hot gas to flow through the
outdoor coil melting the accumulated frost. Unit shall
automatically resume heat pump operation, after pausing to
allow refrigerant pressures to equalize, at conclusion of
defrost cycle.
Unit shall be equipped with a temperature activated drain
valve to allow water generated in heat pump operation and
defrost cycles to drain into wall case rather than being
deposited on outdoor coil.
Each time the heat mode is selected, or the unit is powered
up in the heat mode selection, the heat pump will use
electric resistance heat to bring room temperature to
selected thermostat set point. Heat pump operation will be
used on subsequent unit heating operation if the room
temperature is within 2.7°F of the set point and the unit is
not in the defrost cycle.
Unit shall have a switch concealed from room occupant to
allow heat pump operation to be overridden and heat
provided by electric resistance heat regardless of outdoor
temperature.
In the event of compressor failure during heat pump
operation, unit shall automatically switch to electric
resistance heat to maintain selected room temperature
regardless of outdoor temperatures.
Specifications for Optional Internal Condensate Removal (ICR)
system for Zoneline 3500 or 5500 series heat pump units.
Unit shall have a factory installed Internal Condensate
Removal (ICR) system to permit unit to automatically
dispose of heat pump generated condensate water with no
overflow to outdoors to occur during heating under outdoor
ambient of 55°F. Dry Bulb, 90% Relative Humidity; indoor
ambient 70°F. Dry Bulb, 52% Relative Humidity, for four
hours of continuous run time.