Control Board Layout; E" Control Board - Hoshizaki KM-320MAH Service Manual

A. Control Board Layout

1. "E" Control Board

• "ALARM RESET" Button
• Freeze Timer
LED (yellow)
• Harvest Backup
Timer LED (orange)
• Alarm Buzzer
• POWER OK LED
(red) (lights when
10.5VAC is supplied
to K2 connector)
• Relay LEDs
(4) (indicate which
relays are energized
and which K1
connector pins are
energized
• LED 2 (X2 Relay)
LED 2 on:
K1 Connector Pin #2
LED 2 off:
K1 Connector Pin #3
• LED 3 (X3 Relay)
LED 3 on:
K1 Connector Pin #5
LED 3 off:
K1 Connector Pin #4
(energized in freeze)
• LED 4 (X4 Relay)
K1 Connector Pin #6
• LED 1 (X1 Relay)
K1 Connector Pin #1, #9
"E" Control Board
• S4 Dip Switch
• K2 Connector
Control Transformer
(10.5VAC)
"E" Control Board
Part Number
• "OUTPUT TEST" Button
(used to test relays on control board)
2A1410-02
42
• K3 (white) Connector
Thermistor
(harvest control and
high temperature safety)
• K4 (red) Connector
Open
• Part Number
• K5 (black) Connector
Float Switch
(water level)
Microprocessor
(control board revision
level indicated on label
on side of relay)
• K1 Connector
Pins #1 through #10
#1, 9 Magnetic Contactor or
Compressor Relay
#2 Hot Gas Valve
#3 Fan Motor
Liquid Line Valve
#4 Pump Motor (icemaking)
#5 Pump Motor (pump-out)
#6 Inlet Water Valve
#7, 10 Component Power
Supply
#8 Open
Switch for "C" control board
and "ALPINE" control board
(service control board only)
Set to "ALP" for appliances
covered in this manual.