Specifications

TM022 Raypak RHP 33 Pool and Spa Heat Pump Service Instructions REV C
D.O.I: 14/03/2006
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Thermal Expansion (TX) Valve - A valve, installed between the condenser and
evaporator that controls (meters) the amount of refrigerant delivered to the evaporator.
The TX valve has an external temperature sensor fitted to the suction line and increases or
decreases the refrigerant flow to the evaporator depending on the detected suction line
temperature. There is also a small diameter pipe fitted between the TX valve and the
suction side of the evaporator designed to equalise the operating pressure.
Delay Timer - A timing device connected in series with the compressor relay that prevents
the compressor from short cycling. This device will delay the starting of the compressor for
a period of approximately 6 minutes after power is supplied or resupplied to the
compressor relay by any control circuit component or upon power failure or interruption.
Indicator Lamps (LED’s)
• Power – Amber LED: When lit indicates power is applied to the unit.
• Water Flow – Green LED: When lit indicates there is acceptable water flow through
the Heat Pump and that the water flow switch has closed enabling operation. It
should be noted that this LED will only illuminate whist the unit is calling for heat
and the flow switch is closed.
• Heat Demand – Green LED: When lit indicates the actual water temperature is
below the target water temperature and that the control board is calling for heat.
• Compressor Delay Active – Amber LED: Under normal operation, when lit
indicates compressor anti short cycle timer is active. See “Delay Timer” above.
• Defrost Active – Red LED: When lit indicates the unit is in defrost mode. See
“Defrost Operation” on page 6.
• Low Pressure – Red LED: When lit indicates a failure in the refrigeration circuit.