Rheem 55027500 Service Instructions Manual page 41

Evaporator Thermostat – 551 Series only (Procedure 13)
Personal Protective Equipment should be worn when conducting step 2 of
this procedure to reduce the risk of electric shock. Refer to Rheem Safety
Procedure on electrical testing.
1. Isolate the power to the water heater.
2. Remove the access cover and confirm with a multi-meter between Active and
Neutral at the terminal block that voltage is not present.
3. Remove the air inlet louver (Refer to Procedure 8)
4. Remove the electrical wiring terminal strip cover
and disconnect the wiring to the evaporator
thermostat.
5. Gently slide the evaporator thermostat sensing
capillary out of the evaporator.
6. Undo the 2 screws retaining the thermostat to the
support bracket and remove the thermostat.
7. Complete reassemble in reverse order of above.
Personnel qualified and licensed to work with refrigerants may only carry out
the following repair procedures to the sealed refrigeration system.
The following procedures assume that all work conducted conforms to the
refrigeration code of good practice. During repair the refrigerant must be
recovered, not vented to atmosphere.
Evaporator (Procedure 14)
Personal Protective Equipment should be worn when conducting step 2 of
this procedure to reduce the risk of electric shock. Refer to Rheem Safety
Procedure on electrical testing.
1. Isolate the power to the water heater.
2. Remove the access cover and confirm with a multi-meter between Active and
Neutral at the terminal block that voltage is not present.
3. Remove the evaporator shroud and fan assy. (Refer to Procedure 10 Steps 1 - 6)
4. Gently slide the de-ice thermostat sensing capillary out of the evaporator finning.
5. Remove the pipe insulation to expose pipe work at the evaporator. Un-braze the pipe-
work to the evaporator.
6. Remove the 4 screws retaining the evaporator to the chassis and lift evaporator clear.
7. Fit and secure the replacement evaporator and braze pipe work.
8. Replace the receiver/filter drier. (Refer to Procedure 16 – steps 4 to 6)
9. Pressurise system to 3000kPa and conduct a leak test. Refit and secure pipe work
insulation.
10. Evacuate system to 100 microbar (30") for a period of at least 30 minutes.
11. Recharge system with the correct refrigerant. Refer to specifications table on page 3.
12. Refit the evaporator shroud and fan motor assembly and refrigeration section jacket.
13. Restore power. The refrigeration plant should commence operation.
14. Refit air inlet louver and jacket top.
TM017 Rheem Air Sourced Heat Pump Service Instructions REV: C
Date of Issue: 5/11/05
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40
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled".
When refitting the thermostat bulb it is important it
be positioned in the evaporator in the correct
position (see diagram opposite)