Refrigerant System Fault Finding - Chart 1.4 & 2.2 - Rheem 55027500 Service Instructions Manual

Refrigerant System Fault Finding - Chart 1.4 & 2.2
1.4
Is the
bypass pipe
hot?
YES
Test 10
Is the
de-ice thermostat
closed?
Component Test 9
Warning – "Live" equipment Personal Protective Equipment should be worn
when conducting this test.
TM017 Rheem Air Sourced Heat Pump Service Instructions REV: C
Date of Issue: 5/11/05
This document is stored and maintained electronically by
2.2
Is the
NO TX valve
operating?
YES
Is the
compressor
inefficient?
NO
YES
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled".
Test 9
NO
YES
YES
Fit gauges to low side access valve.
Remove the insulation from the TX
valve sensor on the suction line.
Hold the sensor by hand to increase
the heat detected by the sensor. The
TX valve
following results:
1. Flow of refrigerant through sight
glass of receiver/filter dryer should
increase.
2. Evaporator
increase.
3. Suction line should become cooler.
Remove hand and replace insulation,
the TX valve should close, resulting in
the reversal of the above results.
21
Adjust TX valve or replace if
faulty
Replace the compressor
System overcharged
Adjust refrigerant charge
Replace bypass valve
Replace de-ice thermostat
should open with
pressure
the
should