GE RAG61 Instruccion De Instalación
15
Heat Pumps and Energy Savings
• GE Zoneline Heat Pumps are designed to provide cost
efficient heat pump operation while monitoring room
conditions to maintain comfort.
conditions to maintain comfort.
The units employ a logic system monitoring both outdoor
and indoor temperatures to determine the heat source, thus
increasing energy savings by operating longer in the heat
pump mode.
Heat pumps save energy and cost less to operate than units
with electric resistance heaters as the only heat source. Just
as the EER of an air conditioner is an indication of the
efficiency of the unit, COP (Coefficient of Performance) is
the indication of the efficiency of the heat pump. This
relative efficiency of a heat pump compares the unit to
electric resistance heat. If a unit has a COP of 3.0, it means
the unit will produce three times as much heat at rating
conditions for the same electrical input wattage as an
electric resistance heater.
The compressor is used in heat pump operation just as in
air conditioning operation. In heat pump operation, the hot
refrigerant gas is directed to the indoor coil rather than to
the outdoor coil. Room air that circulates over the indoor
coil gains heat from the coil rather than losing heat to the
coil as during cooling operation.
As the outdoor temperature falls, the heat pump is able to
extract less heat from the outdoor air to raise the
temperature of the indoor air. For this reason all packaged
terminal heat pumps also have electric resistance heaters as
backup to heat pump operation. At some point the heat
pump is unable to provide sufficient heat to adequately
warm the room. Many Packaged Terminal Heat Pumps
cease heat pump operation and change to more expensive
resistance heat at some pre-determined outdoor
temperature to compensate for the inability of the heat
pump to maintain room temperature. This point, called the
“switchover point”, is usually at an outdoor temperature
where savings from heat pump operation may still be
realized, if the unit is designed to maintain room comfort at
the lower outdoor temperatures.
Balance Point
An important consideration of the selection of a heat pump
unit is the “balance point” of the installation. Virtually every
room is unique - with different insulation - different sizes and
types of windows - different types of construction - different
directional exposures. All of these variables, as well as
geographical location, must be considered in order to
determine the balance point, the point at which the heat
pump is unable to produce enough heat to compensate for
the heat loss of the room or area being heated. For these
reasons a consulting engineer should be engaged to
calculate the heat loss and specify the heat pump unit
required.
GE offers two series of Heat Pump units - the 3200 Series
with Standard Microprocessor controls and the 5200 Series
with Highly Featured microprocessor controls - and both
Series utilize multi-stage thermostats to react to the indoor
temperature as well as the outdoor temperature in
determining the heat source to provide comfortable room
conditions and energy savings. This determination of the
heat source based on the indoor temperature helps provide a
more comfortable room.
and indoor temperatures to determine the heat source, thus
increasing energy savings by operating longer in the heat
pump mode.
Heat pumps save energy and cost less to operate than units
with electric resistance heaters as the only heat source. Just
as the EER of an air conditioner is an indication of the
efficiency of the unit, COP (Coefficient of Performance) is
the indication of the efficiency of the heat pump. This
relative efficiency of a heat pump compares the unit to
electric resistance heat. If a unit has a COP of 3.0, it means
the unit will produce three times as much heat at rating
conditions for the same electrical input wattage as an
electric resistance heater.
The compressor is used in heat pump operation just as in
air conditioning operation. In heat pump operation, the hot
refrigerant gas is directed to the indoor coil rather than to
the outdoor coil. Room air that circulates over the indoor
coil gains heat from the coil rather than losing heat to the
coil as during cooling operation.
As the outdoor temperature falls, the heat pump is able to
extract less heat from the outdoor air to raise the
temperature of the indoor air. For this reason all packaged
terminal heat pumps also have electric resistance heaters as
backup to heat pump operation. At some point the heat
pump is unable to provide sufficient heat to adequately
warm the room. Many Packaged Terminal Heat Pumps
cease heat pump operation and change to more expensive
resistance heat at some pre-determined outdoor
temperature to compensate for the inability of the heat
pump to maintain room temperature. This point, called the
“switchover point”, is usually at an outdoor temperature
where savings from heat pump operation may still be
realized, if the unit is designed to maintain room comfort at
the lower outdoor temperatures.
Balance Point
An important consideration of the selection of a heat pump
unit is the “balance point” of the installation. Virtually every
room is unique - with different insulation - different sizes and
types of windows - different types of construction - different
directional exposures. All of these variables, as well as
geographical location, must be considered in order to
determine the balance point, the point at which the heat
pump is unable to produce enough heat to compensate for
the heat loss of the room or area being heated. For these
reasons a consulting engineer should be engaged to
calculate the heat loss and specify the heat pump unit
required.
GE offers two series of Heat Pump units - the 3200 Series
with Standard Microprocessor controls and the 5200 Series
with Highly Featured microprocessor controls - and both
Series utilize multi-stage thermostats to react to the indoor
temperature as well as the outdoor temperature in
determining the heat source to provide comfortable room
conditions and energy savings. This determination of the
heat source based on the indoor temperature helps provide a
more comfortable room.
• Heat Pump Operation — Zoneline 3200 Series
Switchover to resistance heat is determined by indoor temperature
differential and outdoor coil temperature
The Zoneline 3200 Series heat pumps are Standard
Microprocessor controlled units. A solid state thermostat
control is used to measure the room temperature and
compare it to the temperature selected with the “TEMP”
control knob. A temperature sensor is in contact with the
outdoor coil to monitor the outdoor coil temperature
during heat pump operation.
The switchover point of the 3200 Series heat pump is
determined by the outdoor coil temperature or the indoor
air temperature. When the outdoor coil temperature is
above 9°F. (which corresponds to approximately 25°F.
outdoor air temperature), the unit attempts to provide
sufficient heat through heat pump operation to satisfy the
selected temperature setting.
A two-stage thermostat monitors the indoor room
temperature and determines if the heat pump output is
adequate to maintain comfort conditions. As long as the
heat pump output maintains the room temperature within
2.7°F of the set point, the unit will operate in the heat pump
mode. If the room temperature continues to decline with
the heat pump operating, heat pump operation will
terminate and the unit will switch over to electric resistance
heat to warm the room. This heat source logic allows the
heat pump to operate to lower outdoor temperatures,
increasing the savings from heat pump operation, while
providing the ability to use resistance heat only when
necessary. The heat pump and the electric resistance heaters
never operate simultaneously on the Zoneline 3200 Series
Units.
Heat pump defrost - 3200 Series
If the outdoor coil drops below 9°F. (which corresponds to
approximately 25°F. outdoor air temperature), the unit
employs a passive defrost system. A “passive defrost system”
prevents heat pump operation until outdoor temperatures
rise sufficiently to enable economical heat pump operation
to resume. During the defrost mode, the indoor temperature
is maintained by the electric resistance heaters. The defrost
cycle terminates when the outdoor coil temperature rises
above 36°F., at which point the two-stage thermostat will
allow the unit to return to economical heat pump operation.
Heat pump condensate
See page 32 for information on heat pump condensate. The
Zoneline 3200 Series heat pumps 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.
differential and outdoor coil temperature
The Zoneline 3200 Series heat pumps are Standard
Microprocessor controlled units. A solid state thermostat
control is used to measure the room temperature and
compare it to the temperature selected with the “TEMP”
control knob. A temperature sensor is in contact with the
outdoor coil to monitor the outdoor coil temperature
during heat pump operation.
The switchover point of the 3200 Series heat pump is
determined by the outdoor coil temperature or the indoor
air temperature. When the outdoor coil temperature is
above 9°F. (which corresponds to approximately 25°F.
outdoor air temperature), the unit attempts to provide
sufficient heat through heat pump operation to satisfy the
selected temperature setting.
A two-stage thermostat monitors the indoor room
temperature and determines if the heat pump output is
adequate to maintain comfort conditions. As long as the
heat pump output maintains the room temperature within
2.7°F of the set point, the unit will operate in the heat pump
mode. If the room temperature continues to decline with
the heat pump operating, heat pump operation will
terminate and the unit will switch over to electric resistance
heat to warm the room. This heat source logic allows the
heat pump to operate to lower outdoor temperatures,
increasing the savings from heat pump operation, while
providing the ability to use resistance heat only when
necessary. The heat pump and the electric resistance heaters
never operate simultaneously on the Zoneline 3200 Series
Units.
Heat pump defrost - 3200 Series
If the outdoor coil drops below 9°F. (which corresponds to
approximately 25°F. outdoor air temperature), the unit
employs a passive defrost system. A “passive defrost system”
prevents heat pump operation until outdoor temperatures
rise sufficiently to enable economical heat pump operation
to resume. During the defrost mode, the indoor temperature
is maintained by the electric resistance heaters. The defrost
cycle terminates when the outdoor coil temperature rises
above 36°F., at which point the two-stage thermostat will
allow the unit to return to economical heat pump operation.
Heat pump condensate
See page 32 for information on heat pump condensate. The
Zoneline 3200 Series heat pumps 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.