Service manual

48
Installation and Service Manual
TROUBLESHOOTING
PROBLEM ANALYSIS GUIDE - 3 RELAY BOARD
Problem
Long harvest cycle
Cause
Ice weight set too then
Unit not level
Water curtain movement re-
stricted or frozen
Low head pressure:
A) Ambient too low
B) Water valve set too low (wa-
ter units only) or leaking dur-
ing harvest
Scale build up on evaporator
Solenoid hot gas valve not open-
ing. Slow rise of low side pressure
Expansion valve leaking
Corrective Action
Adjust bridge per bridge adjust-
ment instructions
Level
Remove restriction
Minimum ambient temperature
50
o
F (10
o
C)
Adjust water regulator valve or
replace (108
o
F (42
o
C) discharge
water temperature)
Clean per instructions
Replace valve
Replace valve
Problem
Ice bridge light at top of plate
and heavy at bottom
Cause
Siphon operating intermittently or
continuously leaking.
A) Water level set too high
B) Float stuck open
C) Flow control washer missing
from float or installed upside
down (numbers must be fac-
ing up)
D) Siphon not vented
E) Water flow rate over evapo-
rator
Corrective Action
Adjust float
Replace
Replace or reinstall as required
Correct
Check position or distribution tube