Service Manual

41
Freeze-Up - Possible Cause
3. Spray Tubes and/or Spray
Guides
a) Dirty.
b) Out of position.
4. Water Supply a) Low water pressure.
b) External water lters clogged.
c) Insufficient water line size.
Minimum1/4"nominalIDcopperwatertubingorequivalent.
5. Inlet Water Valve a) Screen or orice clogged.
b) Defective.
6. Float Switch
See"IV.D.FloatSwitchCheck
andCleaning"
a) Dirty, sticking.
b) Defective.
7. Refrigerant Charge a) Low.
8. Control Board
See"II.C.3.Controlsand
Adjustments"and"IV.B.Control
BoardCheck"
a) Harvest timer (S4 dip switch 1 & 2) set too short.
b) Harvest pump timer (S4 dip switch 7) not in factory default position.
c) Defective.
9. Bin Control
See"IV.C.BinControlCheckand
Cleaning"
a) Actuator does not move freely.
10. Thermistor
See"IV.E.ThermistorCheck"
a) Loose, disconnected, or defective.
11. Thermostatic Expansion Valve
(TXV)
a) Defective.
12. Hot Gas Valves (KMS & SRK) a) Closed or restricted.
13. Liquid Line Valves (KMS & SRK) a) Open.
14. X11/X10 Relays a) Bad contacts. Open coil. Not allowing pump motor operation during
last 50 seconds of harvest.
Freeze Cycle
1. Evaporator a) Scaled up.
b) Damaged.
2. Spray Tubes and/or Spray
Guides
a) Dirty.
b) Out of position.
3. Refrigerant Charge a) Low.
4. Control Board
See "IV.B.ControlBoardCheck"
a) Freeze timer (S4 dip switch 9 & 10) set incorrectly.
b) Defective.
5. Inlet Water Valve a) Leaking by.
6. Float Switch
See"IV.D.FloatSwitchCheck
andCleaning"
a) Float does not move freely.
b) Defective.
7. Pump Motor a) RPM too slow.
b) Impeller damaged.
8. Thermostatic Expansion Valve
(TXV)
a) Bulb loose or defective.
9. Headmaster (C.P.R.) a) Defective.