9
f) LED Lights and Audible Alarm Safeties
The control board includes LED indicator lights, audible alarm safeties, and an output test
feature. The "POWER OK" LED indicates control voltage and will remain on unless a control
voltage problem occurs. The “POWER OK” LED flashes continuously when the bin is full
and DV energizes for a maximum of 5 minutes to drain the water tank.
At startup, a 5 second delay occurs to stabilize the circuit. LEDs 4 through 8 energize and
sequence from initial startup as listed in the table below. Note that the order of the LEDs
from the outer edge of the board is 5, 6, 8, 9, 4, 7. For more information, see "2.
SEQUENCE OF OPERATION".
Sequence Step
LED
Energized
Components
Time LEDs are On
Min.
Max.
Avg.
1 Minute Fill Cycle
8
HWV
60 sec
Harvest Cycle
5, 6, 8
WV, HGV,
Comp
2 min.
20 min.
3 to 5 min.
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 (and
9 at refill)
Comp, PM, FMS
(FWV at refill)
5 min.
freeze timer
setting
25 to 30 min.
Drain
5, 6, 4, 7
Comp, HGV,
DV, PM
10 sec.
20 sec.
factory default setting
Note: The refill counter is deactivated before shipping.
The built in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.)
Type of Alarm
Notes
1
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
Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row)
Check for open thermistor, HGV not opening, TXV
leaking by, low charge, inefficient Comp, or WRV
leaking by.
3
Freeze Timer
(freeze > specified setting for
two cycles in a row)
Timer is factory set using S1 dip
switch 9 & 10
Check for a float switch stuck closed (up), WV
leaking by, HGV leaking by, PM not pumping, TXV
not feeding properly, low charge, or inefficient
Comp.
To reset the above safeties, press the “ALARM RESET” button with the power supply on.
6
Low Voltage
(184Vac ± 5% or less)
“POWER OK” LED will turn off if voltage protection
operates.
The control voltage safeties automatically reset
when voltage is corrected.
7
High Voltage
(294Vac ± 5% or more)
Legend:
Comp
–compressor;
DV
–drain valve;
FMS
–self-contained fan motor;
FVW
–fill
water valve;
HGV
–hot gas valve; HM–headmaster;
HWV
–harvest water valve;
WRV–water regulating valve;
PM
–pump motor;
TXV
–thermostatic expansion valve
