Page 6 of 22 HEATPRO HEAT PUMP HP13023772 Rev: D
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908.351.5400 www.haywardpool.com
How a Heat Pump Works
A
B
C
D
COLD
WATER
IN
OUT
HOT
WATER
E
WATER HEAT EXCHANGER
(CONDENSER)
AIR COIL (EVAPORATOR)
COMPRESSOR
HEAT
FROM
AIR
TXV
The heat pump takes heat from the environment and uses it to heat the pool water. During heat pump operation,
high temperature, high-pressure sub cooled liquid Refrigerant (A) is throttled by Metering Device (TXV) and
turned into low temperature, low-pressure saturated liquid (B). The two-phase Refrigerant flows through the Air
Coil (Evaporator), where the liquid refrigerant evaporates into vapor by absorbing heat from the surrounding
air. At the outlet of the Air Coil (Evaporator) it becomes a low temperature, low-pressure superheated vapor
(C). The Compressor receives this flow at the suction line (D), and compresses it into a high temperature, high
pressure superheated vapor, which is discharged from the Compressor (E) and flows into the Water Heat
Exchanger (Condenser). The heat carried by the flow is then released to the surrounding water from the pool. At
the same time, the high temperature, high-pressure superheated vapor is then condensed back to high-pressure
sub cooled liquid (A), which completes the cycle. The water, which is being forced through the Water Heat
Exchanger (Condenser) by the pool pump, is heated as it passes through.
Becoming Familiar with Your Heat Pump
Heat Pump Protection Features
Hayward heat pumps are equipped with safeguards that will stop operation to protect the unit in case of the
following events:
• Excessively high refrigerant pressure
• Excessively high water temperature
• Loss of refrigerant
• Fan Motor Failure
• Evaporator Freeze-up
• Low Ambient Temperature
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