14
f) LED Lights and Audible Alarm Safeties
The red LED indicates proper control voltage and will remain on unless a control voltage
problem occurs. At startup, a 5 second delay occurs while the board conducts an internal
timer check. A beep occurs when the control switch is moved to the "OFF" position.
The green LEDs 1 through 4 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 1, 4, 3,
. For more information, see "II.B. Sequence of Operation."
Sequence Step
LED
Energized
Components
Time LEDs are On
Min.
Max.
Avg.
1 Minute Fill Cycle 4
WV
60 seconds
Harvest Cycle
1, 4, and
WV, HGV,
Comp, FMR
minutes 0 minutes 3 to 5 minutes
Freeze Cycle
1
Comp, PM,
FMR/FMS,
LLV
5 minutes freeze timer
setting
30 to 35 minutes
Pump-Out Cycle
1, 4*, 3, and
Comp, FMR,
WV*, HGV,
PM
10 seconds 0 seconds *pump-out timer
setting
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 > 17°F)
(53°C)
Check for harvest problem (stuck HGV or
relay), hot water entering unit, stuck HM, or
shorted thermistor.
Harvest Backup Timer
(harvest > 0 min. for two
cycles in a row)
Orange LED marked "H TIMER" lights up.
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
S4 dip switch 9 & 10
Yellow LED marked "F TIMER" lights up.
Check for F/S stuck closed (up), WV leaking
by, HGV leaking by, PM not pumping, TXV
not feeding properly, low charge, HM not
bypassing, or inefficient Comp.
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6
Low Voltage
(9Vac±5% or less)
Red LED will turn off if voltage protection
operates.
The control voltage safeties automatically reset
when voltage is corrected.
7
High Voltage
(147Vac±5% or more)
Legend:
Comp
–compressor;
FMR
–remote fan motors;
FMS
–self-contained fan motors;
F/S
–float switch;
HGV
–hot gas valve;
HM
–headmaster (C.P.R.);
LLV
–liquid
line valve;
PM
–pump motor;
TXV
–thermostatic expansion valve;
WV
–inlet
water valve
