Refrigeration Removal And Replacement Procedures - Scotsman CU1526 Service Manual

CU1526, CU2026, CU3030
Service Manual

Refrigeration Removal and Replacement Procedures

Thermostatic Expansion Valve
1. Remove left front grill.
2. If the machine was in operation, push and release the Harvest button to shut it down. Wait until the
harvest cycle has ended so the evaporator has no ice on it.
3. Go thru all steps to remove the bin.
4. Disconnect electrical power.
5. Recover refrigerant.
6. Remove insulation covering expansion valve and bulb.
7. Remove strap securing bulb to suction line.
8. Open both discharge and suction access valves
9. Unsweat the expansion valve from the liquid line. Remove it.
10. Unsweat the drier from the liquid line. Remove it.
11. Connect nitrogen to discharge access valve.
12. Immediately place new valve in ice machine.
13. Open nitrogen bottle and braze expansion valve inlet and outlet joints together. Braze new drier into
system.
14. Shut off nitrogen, shut access valves.
15. Evacuate to at least 300 microns.
16. Weigh in the nameplate charge. Check for leaks.
17. Attach bulb to suction line. Position at 4 or 8 o'clock on the tube. Secure tightly but do not crush the
bulb with the strap.
18. Attach valve and bulb insulation.
19. Reconnect electrical power.
20. Return bin and all panels to their original positions.
May 2008
Page 59
Electrical Shock
Hazard.
Disconnect electrical
power before
beginning removal
procedure.