Service manual

40
Installation and Service Manual
COMPONENT DIAGNOSTICS
4 RELAY CIRCUIT BOARD SEQUENCE OF OPERATION
was not perfectly level, this could cause ice
"hang-up". If the curtain is open more than 30
seconds, the machine will shut down on bin full.
4. The water pump will be de-energized for eight
seconds after each dump cycle. This will al-
low the water system to clear itself of air. The
pump will then start with no water cavitation. The
delay follows the normal six second water dump
cycle. During the eight second period, the
manual harvest switch is inoperative.
NOTE A
Dump Switch/Water Curtain(s)
Dump switch ... The left and middle switch will con-
trol number of cycles per dump. Factory setting is to dump
every cycle - 1st and 2nd switches in the down position.
To program the dump cycle for every 3rd cycle, move
the 1st switch to the up position. To program for every
5th cycle, return the 1st switch to the down position and
move the 2nd switch to the up position.
Curtain switch (the right switch in the bank) ... In the
down position it is set for 1 curtain. In the up position it is
set for 2 curtains as noted on the circuit board.
Remote Pump Down Cycle:
With a full bin signal (water curtain remains open),
the Hall switch circuit is incomplete. This de-energizes
the liquid line (pump down) solenoid. The compressor
will continue to operate and pump down the low side of
the system. The low pressure cut-out control contacts
open de-energizing the ice machine at 13 PSI (.90 Bars).
The ice machine will stay off until sufficient ice is
removed from the bin to restore the Hall switch circuit
when the water curtain(s) closes. The closed Hall switch
circuit energizes the liquid line (pump down) solenoid
raising the low side system pressure to 45 PSI (3.10
Bars). This increase in pressure closes the low pressure
cut-out control contacts starting the next freeze cycle.
NOTE B
POWER ON LED INDICATOR
(Multi-purpose warning signal)
Steady on indicates power to circuit boar
Flashing light indicates: Solitech DFE
-Hi-temp safety cut-out SR*** SR***
(CO 115
o
F (46.8
o
C)/CI 95
o
F (35
o
C)
-Shorted thermistor MR** MR**
-Open thermistor MR** MR**
-Missing thermistor MR** MR**
-Mis-wired thermistor MR** MR**
-Curtain switch set incorrectly
example ... will flash when
machine has two thermistors
and curtain switch is set for
on curtain
Curtain switch light goes out:
-Single evaporator machine MR** MR**'
and curtain switch is set for
two curtains
* SR - Self resetting
** MR - Manual resetting. Toggle switch must be turned
off and returned to the ON position to manually
reset circuit board.
*** If evaporator temperature rises above 140
o
F
(43
o
C) reset is manual