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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
COMPONENT REPLACEMENT PROCEDURES
Storage Tank
Draining the Water Heater
1. Isolate 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. For AquaMax storage tanks only, remove the heat pump module. Follow steps 6 – 8 of
the „Heat Pump Module Removal‟ procedure on page 62.
4. Remove the storage tank upper electrical access cover and confirm with a multi-
meter across thermostat terminals 1 and 3 that voltage is not present.
5. Disconnect the cold water supply pipe.
6. Fit a drain hose to the cold-water connection and run the other end to a drain or safe
location.
7. Open the T&PR valve or a hot tap to allow air into the system.
Temperature and Pressure Relief Valve
Never fit a T&PR valve with a rating higher than that indicated on the water
heater rating plate. Do not use reconditioned T&PR valves.
1. Isolate 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 drain line from the T&PR valve.
4. Unscrew the T&PR valve and remove.
A quantity of hot water will discharge from the tank during this process.
Personal Protective Equipment should be worn to prevent scalds or burns.
5. Confirm the replacement T&PR valve is the correct rating and refit using thread tape.
6. Refit the drain line.
7. Close the hot tap and restore water supply.
8. Check T&PR valve thread for leaks.
9. Operate the T&PR valve lever to reset relief drain.
10. Purge air from the system through hot taps.
11. Restore the power supply to the water heater.
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