Rheem 55027500 Service Instructions Manual page 38

Compressor Thermostat (Procedure 4)
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 and remove access cover.
2. Confirm with a multi-meter between Active and Neutral at the terminal block that
voltage is not present.
3. Disconnect the wiring to the thermostat.
4. 550275 and 551275 Models: Undo the 2 retaining nuts and remove the thermostat.
Note: Springs are fitted under each retaining nut to ensure the thermostat is in good
contact with the cylinder wall. Care should be taken to ensure the retaining nuts and
springs are not lost during removal.
550275/A Models: Slide the thermostat out from under the retaining clamp.
5. Remove any scale from the cylinder surface
6. 550275 and 551275 Models: Fit the replacement thermostat over the locating studs
and secure using the springs and retaining nuts.
7. 551275/A: Fit the replacement thermostat under the clamp and set temperature at
60ºC. Reconnect the wiring as per the circuit diagram on page 9.
8. Check water heater internal wiring insulation for cracking.
9. Conduct an electrical insulation test. Refer to page 30.
10. Refit the access cover and restore the power supply.
Booster Thermostat (Procedure 5)
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 and remove access cover.
2. Confirm with a multi-meter between Active and Neutral at the terminal block that
voltage is not present.
3. Disconnect the wiring to the thermostat.
4. Slide the thermostat out from under the retaining clamp.
5. Remove any scale from the cylinder surface
6. Fit the replacement thermostat under the clamp and set temperature at 60ºC
7. Reconnect the wiring as per the circuit diagram on page 9.
8. Check water heater internal wiring insulation for cracking.
9. Conduct an electrical insulation test. Refer to page 30.
10. Refit the access cover and restore the power supply
Anode (Procedure 6)
Elevated temperatures may be present during anode removal process.
Personal Protective Equipment should be worn to prevent scalds or burns.
1. Isolate the power and water supplies to the water heater.
2. Relieve pressure from the water heater through the T & PR valve or a hot tap.
3. Remove the refrigeration section jacket top.
4. Remove the air inlet louver (Refer to Procedure 8)
5. Remove the anode cap(s). Access is provided through the refrigeration plant chassis.
6. Using a 27mm tube or socket spanner remove the anode(s).
7. Apply thread seal tape to replacement anode, refit and tighten. Note: It may be
necessary to cut the anode to length prior to fitting. Refer to page 3 for the correct
anode length.
8. Restore water supply and check for leaks.
9. Refit the anode cap(s), jacket, air inlet louver and jacket top and restore power.
TM017 Rheem Air Sourced Heat Pump Service Instructions REV: C
Date of Issue: 5/11/05
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