Control Board Layout - Hoshizaki KM-901MAH Service Manual

1. Control Board Layout

a) "E" Control Board: Auxiliary Code T-0, U-0
"ALARM RESET" Button
Freeze Timer LED
Harvest Timer LED
Alarm Buzzer
Power LED
(lights when
power is
supplied to the
control board)
Relay LEDs (4)
(indicate which
relays are energized
as listed below)
LED 2 (X2 Relay)
Hot Gas Valve (HGV)
Fan Motor (FM) (FM off
when LED on)
Liquid Line Valve (LLV)
LED 3 (X3 Relay)
Pump Motor (PM)
(on at pump-out only)
LED 4 (X4 Relay)
Inlet Water Valve (WV)
LED 1 (X1 Relay)
Compressor (Comp),
Fan Motor-Remote
(FMR)
"E" Control Board
S4 Dip Switch
K2 Connector
Transformer
"E" Control Board
Part Number 2A1410-01 (factory); 2A1410-02 (service)
"OUTPUT TEST" Button
(used to test relays on control board)
27
WHITE K3 Connector
Harvest Control
(thermistor)
RED K4 Connector
Mechanical Bin Control
(not used on units with
themostatic bin control)
Microprocessor
(control board revision
level indicated by last
2 digits on label)
BLACK K5 Connector
Float Switch
Part Number
K1 Ten-Pin Connector
Pins #1 through #10
#1, 9 Magnetic Contactor
#2 Hot Gas Valve (HGV)
#3 Fan Motor (FM),
Liquid Line Valve (LLV)
#4 Pump Motor (icemaking)
#5 Pump Motor (pump-out)
#6 Inlet Water Valve (WV)
#7, 10 Component Power
Supply
#8 Open
Switch for "C" control board
and "ALPINE" control board
(service control board only)