Specifications

TM022 Raypak RHP 33 Pool and Spa Heat Pump Service Instructions REV C
D.O.I: 14/03/2006
24
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Fault Finding Chart 6
6
Refrigeration circuit fault finding
HIGH
Is
the suction line
pressure low/vacuum
or excessively
high?
Run Heat Pump.
Is
the head pressure
excessive?
Check for high condensing temperature due to:
1 Controlling thermostat not cutting out
2 Compressor contactor contacts welded closed
3 Restriction or blockage in system
4 Check TX valve operation
5 Possible system overcharge
NO
Note: These faults may take time
to diagnose from cold start up. Allow
time for the system to equalize
Leak in refrigerant system.
Locate and repair
LOW
Is
the TX valve
operating?
Adjust TX valve or replace
if faulty
NO
Is
the compressor
inefficient?
Replace compressor
System overcharged -
Adjust refrigerant charge
Did
the high
pressure switch
open?
Did
the low
pressure switch
open?
Leak in refrigerant system.
Locate and repair
NO
NO
YES
YES
YES
YES
NO
Is
the operating
pressure
low?
Is
the operating
pressure
high?
YES YES
Replace low pressure
switch
Replace high pressure
switch
YES
NO
NO
Fit guages to high and
low side of system and
run Heat Pump.
Test 24
Test 23Test 9
Test 8