Hoshizaki KM-901MAH Service Manual page 28

b) "G" Control Board: Auxiliary Code U-1 and Later
Bin Control Switch
Closed LED (green)
(on continuously
in thermostatic bin
control application)
Bin Control Switch
Open LED (yellow)
(mechanical bin control
application only)
Part Number
Alarm Buzzer
Power LED (red)
(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,
harvest (if applicable))
LED 4 (X4 Relay)
Inlet Water Valve (WV)
LED 1 (X1 Relay)
Compressor (Comp),
Fan Motor-Remote
(FMR)
K2 Connector
Transformer
"G" Control Board
"ALARM RESET" Button
"G" Control Board
Part Number 2A3792-01
"OUTPUT TEST" Button
S4 Dip
(used to test relays on control board)
Switch
28
WHITE K3 Connector
Harvest Control
(thermistor)
RED K4 Connector
Mechanical Bin Control or
K4 Jumper (thermostatic
bin control application)
S5 Dip Switch
BLACK K5 Connector
Float Switch
Label
(control board revision
level indicated on label
on side of relay)
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,
harvest (if applicable))
#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)