Service Manual

35
B. LED Lights and Audible Alarm Safeties
Beep occurs and red CB "POWER OK" LED turns on when control switch is moved to
"ICE" position.
Sequence
Green LEDs 4 through 8 turn on and sequence from initial startup as listed in the
table below. Order of green LEDs from the outer edge of control board is 5, 6, 8, 9, 4,
7.
Sequence Step LED
Energized
Components
Time LEDs are On
Min. Max.
1-Minute Fill Cycle 8 WV
Harvest Cycle 5, 6, 8 Comp, FM, HGV, WV 2 minutes 20 minutes
Last 0, 10, 30, or 50 seconds (adjustable by dip switch) of harvest, WV de-energizes and PM energizes
(LEDs 5, 6, and 7 are on)
Freeze Cycle 5, 7 Comp, FM, PM 5 minutes freeze timer
setting
Pump-Out Cycle 5, 6, 4,7 Comp, HGV, PM, DV 10 seconds 20 seconds
Alarms
Type Alarm Notes
1
Beep
High Evaporator Temp.
(temperature > 127°F) (53°C)
Check for harvest problem (stuck HGV or relay), hot water
entering unit, or shorted thermistor.
2
Beep
Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row)
Check thermistor (open), HGV not opening, TXV leaking
by, low charge, inefficient Comp, or WRV leaking by.
3
Beep
Freeze Timer
(freeze > freeze timer setting
for two cycles in a row)
Check FS stuck closed (up), WV leaking by, HGV leaking
by, PM not pumping, TXV defective, low charge, or
inefficient Comp.
To reset above safeties, press "ALARM RESET" button with power supply on.
6 Low Voltage
(92Vac±5% or less)
Red LED turns off if voltage protection operates.
Control voltage safeties automatically reset when voltage
is corrected.
7 High Voltage
(147Vac±5% or more)
Legend: Comp–compressor; DV–drain valve, FM–fan motor; FS–oat switch; HGV–hot gas
valve; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating
valve; WV–inlet water valve