Scotsman IS100 - Manual (Page 9)

ELECTRICAL SEQUENCE
Refer to the wiring diagram.
Ice Vending:
Ice is dispensed as long as the ice vend lever or
push button is pushed, or until the hopper is empty
of ice.
••
When the ice vend lever or push button is
pushed, the vend switch closes, and makes a
circuit to the coil of relay A.
••
When relay A is energized, relay A’s contacts
6-9 and 7-4 close. Relay A’s contacts 7-1 open.
••
When relay A’s contacts 6-9 close, they make a
circuit to the door solenoid, which opens the ice
door.
••
When relay A’s contacts 7-4 close, they make a
circuit to the coil of relay B.
••
When relay A’s contacts 7-1 open, the circuit to
the timer is opened.
••
When relay B’s coil is energized, it closes a
circuit to the gearmotor, and the motor turns the
rotor.
Stand By:
••
Relay A’s contacts 7-1 are closed and make a
circuit to the timer.
••
The timer is energized when the unit is not
dispensing. The timer switch will close for a few
seconds every two hours.
••
When the timer switch is closed, it makes a
circuit to relay B’s coil.
••
When relay B is energized, it powers the
gearmotor, and the rotor is turned.
PROBLEM PROBABLE CAUSE CORRECTION
Will not dispense ice 1. No ice in hopper 1. Fill hopper with ice
2. Vend switch does not close 2. Check vend switch, replace if
open
3. Drive motor will not run 3. Check drive motor, replace if
not working
4. Door solenoid will not open
door 4. Check/replace door and
solenoid
5. Rotor will not turn 5. Check hub of rotor
6. Relay for vend switch does
not close during operation. 6. Check relays, replace if
necessary.
SERVICE DIAGNOSIS
IS100 and IS150
October 1993
Page 9