Specifications

TM022 Raypak RHP 33 Pool and Spa Heat Pump Service Instructions REV C
D.O.I: 14/03/2006
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Common Faults
Unit is running but not heating
When a complaint is lodged about the performance of a pool heating system there are a
number of causes that should be checked and eliminated. In an attempt to pinpoint the
most likely cause it is important to discuss with the customer their reasons for the
complaint, the duration of the problem, any change in circumstances or usage and recent
weather conditions. This information in conjunction with the following listed common faults
will assist you in locating the most likely cause.
When first attending a call of this nature it will help to check the following:
• Ensure water flow through the unit is adequate. Check the system for obstructions
such as a clogged filter pump strainer or a dirty filter. Check that valves are in the
correct position.
• Is the ejected air from the unit 4 to 6 degrees cooler than incoming air? If so the unit
is extracting heat from the air and transferring it to the pool.
• Are the evaporator and internal copper pipes “sweating”? This is also evidence of
heat removal from the air. When the air is cool with low humidity, “sweating” may
not be evident.
• Ask the customer how long the unit has been operating. During initial pool heating
in cold weather it may require a week to elevate the pool temperature to a
comfortable level. Normally it takes about 4 days.
• Check how many hours per day the unit is operating. Remember that the heat
pump only operates while the pool pump is operating. Set the pool system time
clock to permit 24 hours per day operation. After the desired temperature is reached
the system can be returned to normal operation.
• Check that airflow through the unit is not being obstructed by shrubbery, tall grass,
dirty evaporator coils or any other obstruction which could reduce performance.
• Is a pool blanket/cover being used? Unblanketed pools can loose up to 6º per night
compared to 2º or less when a blanket is used. Without a blanket/cover the total
heat gained during the day can be lost over night.
• Are rapid heat losses occurring in some other way such as high wind, waterfalls,
spa spillage, bubblers, rainfall, flow through solar panels at nights or a high water
table.
Fault Finding Charts and Tests
Fault Finding Chart Index
Fault Chart number Page
Pool heater not operating 1, 1.1, 1.2, 1.3, 1.4 15, 16, 17, 18, 19
Insufficient hot water 2, 2.1 20, 18
Water too hot 3 21
Leaking water heater 4 22
Noisy water heater 5 23
Refrigeration circuit fault finding 6 24
Blowing fuse or circuit breaker 7 31