Rheem 325 II Series Service Instructions Manual page 75

13. Measure and note the position of the suction line brace on the evaporator coil. Remove
the suction line brace and retain for re-use on the replacement evaporator coil.
To remove the suction line brace, remove the nut from the pipe clip that secures the
suction line to the brace. Free the pipe clip from the brace and pipe, and retain the pipe
clip for re-use on the new evaporator coil.
14. Remove the 2 screws retaining the brace to the evaporator coil end plates, and remove
the brace by sliding it up and off the evaporator coil.
15. Fit the suction line brace to the replacement evaporator coil, by sliding the brace down
from the top of the coil to the correct location as noted in step 13 above, and secure
with 2 screws.
16. Fit the pipe clip and nut to the suction line brace now installed on the replacement
evaporator coil.
17. Braze the replacement evaporator coil into place, being sure to nitrogen purge. NOTE:
The TX valve must be cooled whilst brazing pipework, to prevent internal
damage.
18. Refit the 4 screws that secure the evaporator coil to the chassis side members (through
the evaporator drip tray).
19. Attach the TX valve bulb firmly to the suction line at the 1 o‟clock position and refit the
insulation.
20. Replace the filter drier. Follow steps 4 and 5 of the „Filter Drier‟ procedure on page 67.
21. Pressurise the refrigeration system with nitrogen to 2500kPa and conduct a leak test.
22. Slide the section of pipe insulation on the suction line back up to its correct location
where the suction line crosses the liquid line.
23. Re-fit the fan assembly and shroud to the evaporator coil, using the 6 spring clips.
24. Re-route the fan cable and plug it back in to the controller.
25. Refit the evaporator sensor and clip into the
evaporator coil. Note: The sensor must be
positioned in the evaporator in the correct
location (refer to the diagram opposite).
26. Evacuate system to 500 microns of mercury
(65Pa absolute) for at least 30 minutes.
27. Recharge the
refrigerant. Refer to the Specifications – Heat
Pump Module table on page 7.
18. 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.
19. Check the TX valve superheat setting and adjust if necessary. Refer to steps 5 – 8 of
the „TX Valve Adjustment‟ procedure on page 72.
20. 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).
21. Isolate power and remove gauges.
22. Check the flexible hose connections for water leaks.
28. Refit the heat pump module access cover and restore power supply to the water
heater.
TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
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