Appendixc - Evaporator Replacement; Procedure For Wcc / Wcf Ice Makers - Cornelius IMD 600-90 Training Manual

Cornelius Ice Makers Training Manual
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PPENDIX

Procedure for WCC / WCF Ice Makers

1. Disconnect the water and power supply from the ice maker being serviced.
2. Remove the exterior panels, top, front and sides in that order.
3. Attach a gauge manifold set to the system and recover the refrigerant charge. Follow the reclaiming
manufacturers instructions for the correct procedure. Access valves are provided on the ice maker.
4. Drain the water from the evaporator by pulling the tube from the bottom center of the float mecha-
nism.
5. Remove the dispense tray cover at the top of the evaporator. Pull the auger assembly from the
evaporator and place it in a bucket of ice maker cleaner while finishing the evaporator replacement.
6. Remove the dispense tray assembly from the top of the evaporator by loosening the screw clamp
and pulling the tray upwards off of the evaporator.
7. Remove the insulation from the refrigerant lines at the expansion valve, inlet side of the evaporator
and the suction line, outlet side of the evaporator, exposing the welds. If dry and undamaged, the
insulation can be re-used. Prepare for welding.
8. Protect the expansion valve from excess heat by wrapping it with a cold wet rag or a commercial
heat protection product. Heat the joint between the valve and the evaporator inlet until it is hot
enough to separate, then pull the expansion valve from the evaporator inlet. Separate the suction
line from the evaporator in the same manner.
9. Heat and remove the refrigerant filter dryer from the liquid line. Do not install the new dryer until
after the new evaporator is in to prevent moisture saturation of the new dryer.
10. Un-bolt the base of the evaporator from the gearmotor; a 7/16" wrench is required. Lift the evapora-
tor up off of the gearmotor. Gently prying the base upward is sometimes required.
11. Inspect the gearmotor seal assembly for signs of leakage or damage. Repair or replace as neces-
sary. Lubricate the seals rubber ring with a food grade lubricant.
12. Place the new evaporator onto the gearmotor seal assembly. Carefully rotate the evaporator until
the refrigerant lines are indexed in the same way as the evaporator just removed. Bolt the evapora-
tor down as before. Applying anti-seize (Loctite Silver Grade Anti-seize #76764) on the bolt threads
is recommended.
13. Clean and weld the refrigeration connections using silver brazing solder. Be careful to protect the
expansion valve from heat as before. Install the new dryer on the liquid line.
14. Pressure leak testing with dry nitrogen is recommended before charging. Do not exceed nameplate
pressure ratings!
15. Evacuate the unit to 500 microns or less and check for signs of pressure rise due to leaks or mois-
ture in the system.
16. Re-charge the system using a refrigerant charging scale or Dial-a-Charge to exact nameplate spec-
ifications.
17. Re-assemble the dispense tray assembly, install the cleaned auger assembly and the water feed
line to the base of the evaporator. Re-wrap the insulation on the refrigerant lines.
18. Turn on the water supply and check for leaks. See that the evaporator fills to the correct level.
Adjust the float if necessary. Make certain that the float shuts off completely once the correct water
level has been achieved.
19. Check incoming voltage to the ice maker and be sure it is within nameplate ratings. Restore power
and start the ice maker. Check the gearmotor amp draw against its nameplate rating. Refrigerant
suction pressure should settle at approximately 28 psig (R464A).
20. Check the condenser for obstruction and replace the exterior panels.
Publication Number: TP00967
R
VAPORATOR EPLACEMENT
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