Service Manual

33
Freeze-Up - Possible Cause
8. Thermostatic Expansion Valve a) Bulb loose or defective.
9. Headmaster a) Defective.
10. Liquid Line Valves (KMS & SRK) a) Restricted.
3. Low Ice Production
Low Ice Production - Possible Cause
Long Harvest Cycle
1. Evaporator a) Scaled up.
2. Spray Tubes, Spray Guides, and
Splash Guard
a) Dirty.
b) Out of position.
3. Refrigerant Charge a) Low.
4. Water Supply a) Low water pressure.
b) External water lters clogged.
c) Insufficient water line size.
Minimum 3/8" nominal ID copper water tubing or equivalent.
d) Too cold.
5. Control Board
See "II.D. Control Board Check"
a) Thermistor connection loose (K3).
b) Defective.
6. Thermistor
See "II.G. Thermistor Check"
a) Loose, disconnected, or defective.
7. Hot Gas Valves (KMS & SRK) a) Erratic or closed.
8. Inlet Water Valve a) Screen or orice clogged.
9. Compressor a) Inefficient or off.
10. Liquid Line Valves (KMS & SRK) a) Erratic or open.
11. Thermostatic Expansion Valve
(TXV)
a) Defective.
12. Headmaster a) Defective.
Long Freeze Cycle
1. Evaporator a) Scaled up, dirty.
2. Float Switch
See "II.F. Float Switch Check and
Cleaning"
a) Scaled up, dirty.
b) Float sticking.
c) Defective switch.
3. Inlet Water Valve a) Leaking by.
4. Hot Gas Valves (KMS & SRK) a) Erratic or open.
5. Condenser a) Clogged.
6. Control Board
See "II.D. Control Board Check"
a) Float switch connection loose (K5).
b) Defective.
7. Refrigerant Charge a) Low.
8. Thermostatic Expansion Valve
(TXV)
a) Bulb loose.
b) Defective.
9. Compressor a) Inefficient or off.
10. Pump Motor a) RPM too slow.
11. Liquid Line Valves (KMS & SRK) a) Erratic or restricted.
12. Headmaster a) Defective.