Page 1 of 17 Heat Pump ESCO Heat Pump ESCO.pdf
An air-to-air heat pump has many of the same Reversing valve
components as an air conditioning system. The major
difference is that a heat pump also has an
The air-to-air heat pump outdoor unit is most efficient In a moderate climate zone.
if located;
Air-to-air heat pumps are most practical to operate in +10
areas where the lowest winter temperature does not
go below ______ *F
Air-to-air heat pumps, operating without auxiliary 100
heat, provide air to the registers that is approximately
_______ *F or less.
As outdoor ambient air temperature decreases, a heat Decreases.
pump's COP;
At temperatures above 45 degrees *F, the heat pump Condenser to release 3 to 4 times more heat than it takes in electrical
refrigeration cycle permits the; energy to drive the compressor.
1 of 17 Heat Pump ESCO Page 1
,Page 2 of 17 Heat Pump ESCO Heat Pump ESCO.pdf
At what temperature is an outdoor ambient Slightly above the initial balance point.
thermostat normally set?
Because of the possibility of liquid flood-back, a heat Suction Accumulator.
pump that uses a reciprocating compressor should be
equipped with a;
Before connecting a manifold gauge set to a heat In the heat mode, the suction line entering the compressor contains;
pump system, you should first;
Compressors designed for heat pumps differ from It is designed to operate at high compression ratios.
compressors designed for A/C in that;
COP is the abbreviation for; Coefficient of performance.
A customer complains that their heat pump systems A faulty defrost relay (does not energized the aux. heat during the defrost
blows cool air periodically during the heat mode. This mode.)
could be caused by;
2 of 17 Heat Pump ESCO Page 2
, Page 3 of 17 Heat Pump ESCO Heat Pump ESCO.pdf
The customer complaint is not enough heat. You A stuck open check valve at the outdoor coil.
install service gauges and find the low side pressure
is higher than normal and the high side pressure is
lower than normal. You switch to the cooling mode
and find the pressures are normal. The most likely
cause of the problem is;
The defrost cycle can be initiated by; Time and temperature.
The defrost cycle can be terminated by; Time/temperature
The DTC and cam will close the DTC N.O. contacts The DFR N.O. contacts close, which forms a holding circuit.
momentarily (approx. 5 seconds). How is the DFR
kept organized when the DTC N.O. contacts open?
During the cooling cycle, the indoor coil becomes; The evaporator.
During the defrost cycle, the outdoor fan is usually; Turned off.
3 of 17 Heat Pump ESCO Page 3
An air-to-air heat pump has many of the same Reversing valve
components as an air conditioning system. The major
difference is that a heat pump also has an
The air-to-air heat pump outdoor unit is most efficient In a moderate climate zone.
if located;
Air-to-air heat pumps are most practical to operate in +10
areas where the lowest winter temperature does not
go below ______ *F
Air-to-air heat pumps, operating without auxiliary 100
heat, provide air to the registers that is approximately
_______ *F or less.
As outdoor ambient air temperature decreases, a heat Decreases.
pump's COP;
At temperatures above 45 degrees *F, the heat pump Condenser to release 3 to 4 times more heat than it takes in electrical
refrigeration cycle permits the; energy to drive the compressor.
1 of 17 Heat Pump ESCO Page 1
,Page 2 of 17 Heat Pump ESCO Heat Pump ESCO.pdf
At what temperature is an outdoor ambient Slightly above the initial balance point.
thermostat normally set?
Because of the possibility of liquid flood-back, a heat Suction Accumulator.
pump that uses a reciprocating compressor should be
equipped with a;
Before connecting a manifold gauge set to a heat In the heat mode, the suction line entering the compressor contains;
pump system, you should first;
Compressors designed for heat pumps differ from It is designed to operate at high compression ratios.
compressors designed for A/C in that;
COP is the abbreviation for; Coefficient of performance.
A customer complains that their heat pump systems A faulty defrost relay (does not energized the aux. heat during the defrost
blows cool air periodically during the heat mode. This mode.)
could be caused by;
2 of 17 Heat Pump ESCO Page 2
, Page 3 of 17 Heat Pump ESCO Heat Pump ESCO.pdf
The customer complaint is not enough heat. You A stuck open check valve at the outdoor coil.
install service gauges and find the low side pressure
is higher than normal and the high side pressure is
lower than normal. You switch to the cooling mode
and find the pressures are normal. The most likely
cause of the problem is;
The defrost cycle can be initiated by; Time and temperature.
The defrost cycle can be terminated by; Time/temperature
The DTC and cam will close the DTC N.O. contacts The DFR N.O. contacts close, which forms a holding circuit.
momentarily (approx. 5 seconds). How is the DFR
kept organized when the DTC N.O. contacts open?
During the cooling cycle, the indoor coil becomes; The evaporator.
During the defrost cycle, the outdoor fan is usually; Turned off.
3 of 17 Heat Pump ESCO Page 3
