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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
8. Refit the compressor sensor to the discharge line.
9. Replace the filter drier. Follow steps 4 and 5 of the „Filter Drier‟ procedure on page 67.
10. Pressurise the refrigeration system with nitrogen to 2500kPa and conduct a leak test.
11. Refit and secure pipework insulation to the discharge line.
12. Evacuate system to 500 microns of mercury (65Pa absolute) for at least 30 minutes.
13. Recharge the system with the correct refrigerant. Refer to the Specifications – Heat
Pump Module table on page 7.
14. Refit the heat pump outer jacket and refit/re-install the heat pump module, restore
power and allow the heat pump to run for at least 10 minutes – confirm operating
pressures are acceptable (refer to page 54).
15. Isolate power and remove gauges.
16. Check the flexible hose connections for water leaks.
17. Refit the heat pump module access cover and restore power supply to the water
heater.
Discharge Check Valve (1 hour*)
1. Remove the heat pump module. Refer to the „Heat Pump Module Removal‟ procedure
on page 62.
2. Remove the heat pump module outer jacket. Follow steps 6 – 14 of the „Outer Jacket‟
procedure on page 62.
3. Remove the pipe insulation from the discharge line.
4. Remove the compressor sensor from the discharge line.
5. Recover the refrigerant from the sealed refrigeration system.
6. Disconnect the pipework from the discharge check valve.
7. Braze the replacement discharge check valve into place, being sure to nitrogen purge.
8. Refit the compressor sensor to the discharge line.
9. Replace the filter drier. Follow steps 4 and 5 of the „Filter Drier‟ procedure on page 67.
10. Pressurise the refrigeration system with nitrogen to 2500kPa and conduct a leak test.
11. Refit and secure pipework insulation to the discharge line.
12. Evacuate system to 500 microns of mercury (65Pa absolute) for at least 30 minutes.
13. Recharge the system with the correct refrigerant. Refer to the Specifications – Heat
Pump Module table on page 7.
14. Refit the heat pump outer jacket and refit/re-install the heat pump module, restore
power and allow the heat pump to run for at least 10 minutes – confirm operating
pressures are acceptable (refer to page 54).
15. Isolate power and remove gauges.
16. Check the flexible hose connections for water leaks.
17. Refit the heat pump module access cover and restore power supply to the water
heater.
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