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Service. All printed copies are deemed uncontrolled.
TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
9. Pressurise the refrigeration system with nitrogen to 2500kPa and conduct a leak test.
10. Evacuate system to 500 microns of mercury (65Pa absolute) for at least 30 minutes.
11. Recharge the system with the correct refrigerant. Refer to the Specifications
– Heat
Pump Module table on page 7.
12. 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.
13. Check the TX valve superheat setting and adjust if necessary. Refer to steps 5
– 8 of
the
„TX Valve Adjustment‟ procedure on page 72.
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.
Evaporator Coil
(1 hour*)
WARNING: Heat must NOT be applied to plastic components. When brazing
pipework as indicated in this procedure, a heat shield must be used to
prevent the possibility of damage.
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 evaporator sensor from the evaporator coil.
4. Disconnect the fan plug from the controller.
5. Release the fan cable from its fixings.
6. Remove the 6 spring clips retaining the fan assembly and shroud to the evaporator coil,
slide the assembly forward and remove.
7. Remove the insulation to expose the TX valve bulb and remove the bulb from the
suction line.
8. Slide the section of pipe insulation on the suction line where it crosses the liquid line
down as far as possible, to expose the joint in the suction line.
9. Remove the 4 screws securing the evaporator coil to the chassis side members.
10. Recover the refrigerant from the sealed refrigeration system.
11. Disconnect the evaporator pipework at the TX valve outlet and the joint in the suction
line exposed in step 8 above.
NOTE: The TX valve must be cooled whilst
separating pipework, to prevent internal damage.
12. Remove the evaporator coil.
