Specifications

TM022 Raypak RHP 33 Pool and Spa Heat Pump Service Instructions REV C

D.O.I: 14/03/2006

This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”.

Boil Off – The action of a substance as it absorbs heat and changes state (evaporates)

from a liquid to a vapour (gas).

Give Up Heat – The action of a substance as it releases heat and changes state

(condenses) from a vapour (gas) to a liquid.

Components and their Function

Spa and Pool Temperature Dials - Two adjustable dials (potentiometers) that allow a

water temperature selection of 16 - 40ºC, one for Spa and one for Pool.

Spa/Remote/Pool Selector Switch - A three position selector switch that allows operation

of the selected temperature dial. In the “Remote” position external temperature selectors

or switches are used to control water temperature.

Thermostat - A device responsive to temperature that controls the supply of electrical

energy to the compressor, which results in the stored water being maintained at the

required temperature. For Heat Pumps the control board acts as the thermostat by

comparing inputs from the selected temperature dial and water sensor to determine if a

call for heat is required.

Flow Switch - A switch responsive to water flow (pressure) that controls operation of the

compressor to ensure that the system does not operate without adequate water flow.

Defrost Switch - A switch responsive to temperature that controls operation of the

compressor motor to perform defrosting of the evaporator in cold weather, typically below

10 degrees Celsius.

High Pressure Switch - A switch responsive to pressure installed in the refrigeration

circuit (high side) that controls operation of the compressor if refrigerant pressure becomes

too high as a result of a malfunction.

Low Pressure Switch - A switch responsive to pressure installed in the refrigeration

circuit (low or suction side) that controls operation of the compressor if refrigerant pressure

becomes too low as a result of a malfunction or loss of refrigerant charge.

Compressor - An electro-mechanical device that adds heats to the refrigerant by

compressing it, known as “heat of compression” the resulting increase in refrigerant

temperature increases its pressure and causes the refrigerant to circulate through the

system.

Evaporator - A finned copper coil mounted around the sides of the Heat Pump. The

refrigerant enters as a liquid, as it passes through the coil it absorbs heat from the

surrounding atmosphere and “boils off” (evaporates) to a gas.

Condenser or heat exchanger – An alloy coil containing two separate chambers. The

refrigerant enters one chamber as a gas, as it passes through the coil it transfers (“gives

up”) the heat absorbed via the evaporator to the flowing water in the second chamber,

during this process the refrigerant cools and changes state (condenses) back to a liquid.

Receiver Filter Drier - This device, fitted between the condenser/heat exchanger and

thermal expansion (TX) valve, receives and stores liquid refrigerant from the condenser for

delivery to the evaporator. The receiver also incorporates a filter and drier to trap

impurities and remove moisture from the sealed refrigeration system