Service Manual

31
B. LED Lights and Audible Alarm Safeties
Beep occurs and red "POWER OK" LED turns on when control switch is moved to "ICE"
position.
Sequence
Green LEDs 1 through 4 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 1, 4, 3, 2.
Sequence Step LED
Energized
Components
Time LEDs are On
Min. Max.
1-Minute Fill Cycle 4 WV
Harvest Cycle 1, 4, 2 Comp, HGV, WV 1 minute 20 minutes
Harvest Pump Time
(harvest assist)
1, 3, 2 Comp, HGV, PM 0 seconds 50 seconds
Freeze Cycle 1 Comp, FM, PM, LLV 5 minutes freeze timer
setting
Slush Control 1, 3 Comp, FM, LLV If S5 dip switch 5 on,
PM off 10 sec. when
thermistor at 36°F (2.2°C)
Pump-Out Cycle 1, 4
†
, 3, 2 Comp, HGV, PM, WV
†
10 seconds 20 seconds
†
pump-out timer setting
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, stuck HM, or shorted thermistor.
2
Beep
Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row)
Check thermistor (open), HGV not opening, TXV or LLV
leaking by, low charge, inefficient Comp.
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, LLV not opening, 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: CB–control board; Comp–compressor; FM–fan motor; FS–oat switch;
HGV–hot gas valve; L LV–liquid line valve; PM–pump motor; TXV–thermostatic
expansion valve; WV–inlet water valve