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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
19. Braze the liquid line tail (and new filter drier) and the discharge line assembly in to the
replacement heat exchanger, ensuring they are in the correct orientation and being
sure to nitrogen purge.
NOTE:
If possible, the heat exchanger should be partially
immersed in a water bath while brazing the pipework.
20. Fit the union assembly to the bottom water fitting on the replacement heat exchanger.
21. Fit the heat exchanger into the styrene insulation and secure the insulation using a
cable tie.
22. Fit the heat exchanger brackets over the top and bottom of the heat exchanger,
ensuring they are orientated correctly.
23. Gently lift the evaporator coil at the heat exchanger end to create enough clearance to
relocate the heat exchanger assembly into the heat pump module. Ensure the heat
exchanger bracket tabs sit correctly into the chassis base and the evaporator drip tray.
Refit any cabling to fixings as required.
24. Refit the 2 screws that secure the evaporator coil to the chassis side member (through
the evaporator drip tray).
25. Braze the filter drier to the sight glass, being sure to nitrogen purge.
26. Braze the discharge line to the compressor, being sure to nitrogen purge.
27. Pressurise the refrigeration system with nitrogen to 2500kPa and conduct a leak test.
28. Refit the compressor sensor to the discharge line.
29. Refit and secure pipework insulation to the discharge line.
30. Refit the flexible hose to the top water fitting on the heat exchanger.
31. Refit the heat exchanger water outlet sensor.
32. Refit the circulator.
33. Refit the controller.
34. Evacuate system to 500 microns of mercury (65Pa absolute) for at least 30 minutes.
35. Recharge the system with the correct refrigerant. Refer to the Specifications
– Heat
Pump Module table on page 7.
36. 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).
37.
Isolate power
and
remove gauges.
38. Check all water connections for water leaks.
39. Refit the heat pump module access cover and restore power supply to the water
heater.
