Service manual

Refrigeration System
The refrigeration system is monitored by the high
pressure cut out switch. If the refrigeration
discharge pressure exceeds the pre-set point of the
switch, it will open, causing the controller to shut
the machine off. The discharge pressure control is
an automatic reset switch, and after the discharge
pressure drops, the controller will restart the unit. A
4 in the code display indicates high discharge
pressure.
The refrigeration system is also monitored by the
low pressure cut out switch. If the refrigeration low
side pressure drops below a pre-set point, the
switch will open. When that occurs, the controller
will shut the machine off. The low pressure cut out
switch is an automatic reset switch and after the
low side pressure increases to the cut in point, the
controller will restart the machine. A 4 will show in
the code display to indicate low suction pressure.
Note: the low pressure control for a Remote is a
pump down switch, and when it opens the
compressor stops and no change is noted by the
controller.
Electrical Sequence
Pushing and releasing the On button starts the
machine. The sequence of operation begins with
water. Water must be sensed or the controller will
not start the ice making process. If there is no
water, a 3 will show it the code display. If there is
water, and there is nothing blocking the infrared
beam of the ice sensors, the controller will start the
machine. A flashing F will show in the code display
while the auger drive motor starts up. When it has
started, the compressor will start and the flashing F
will change to a continuous F. This continues until
the ice level control senses a full bin, at that time
the compressor is shut off, and the auger motor
continues to operate for a short time to clear the
evaporator of any left over ice. A b will show in the
code display.
September 2009
Page 22
N0422, F0522, N0622, F0822, N0922, F1222, N1322, F1522
Air, Water or Remote Service Manual
Indicator Lights & Their Meanings
Power Status Water
De-Scale &
Sanitize
Light Actions
Steady Green Normal Normal - -
Blinking Green
Self Test
Failure
Switching on or off.
When Smart-Board used,
machine attention
recommended.
--
Blinking Red - Diagnostic shut down Lack of water -
Yellow - - -
Time to descale
and sanitize
Blinking Yellow - - -
In Cleaning
Mode
Light Off No power Switched to Off Normal Normal
All Blinking Unit is remotely locked out - check with leasing company