Rheem 325 II Series Service Instructions Manual page 72

Sight Glass (45 minutes*)
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. Recover the refrigerant from the sealed refrigeration system.
4. The filter drier must also be replaced – disconnect the pipework from the filter drier inlet
and the sight glass outlet.
The following steps MUST be carried out on the removed filter drier and sight glass
assembly:
Empty any retained oil out of the filter drier into a safe oil collection container,
whilst holding the filter drier at a safe distance and taking care to ensure the
pipes are never pointed towards the face.
Remove the pipe caps from the new filter drier and install the caps onto the
removed filter drier and sight glass assembly. The caps may be split so be sure
to securely tape the caps in place on the removed filter drier.
5. Braze the replacement sight glass and filter drier into place, being sure to nitrogen
purge.
6. Pressurise the refrigeration system with nitrogen to 2500kPa and conduct a leak test.
7. Evacuate system to 500 microns of mercury (65Pa absolute) for at least 30 minutes.
8. Recharge the system with the correct refrigerant. Refer to the Specifications – Heat
Pump Module table on page 7.
9. 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).
10. Isolate power and remove gauges.
11. Check the flexible hose connections for water leaks.
12. Refit the heat pump module access cover and restore power supply to the water
heater.
TX Valve Adjustment
1. Isolate power to the water heater.
2. Remove the heat pump module by following steps 6 – 8 of the „Heat Pump Module
Removal‟ procedure on page 62.
3. Remove the heat pump module access cover and fit pressure gauges to the low side
access valve.
4. Restore power and allow the heat pump to run for at least 15 minutes.
WARNING: The suction line brace MUST be fitted whenever the heat pump
is in operation.
TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
This document is stored and maintained electronically by Service. All printed copies are deemed uncontrolled.
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