Component Specifications And Diagnostics; Main Fuse; Bin Switch - Manitowoc QR0320A Service Manual

Electrical System

Component Specifications and Diagnostics

MAIN FUSE

Function
The control board fuse stops ice machine operation if
electrical components fail causing high amp draw.
Specifications
The main fuse is 250 Volt, 7 amp.
Check Procedure
High (line) voltage is applied to the control board
(terminals #55 and #56) at all times. Removing the
control board fuse or moving the toggle switch to
OFF will not remove the power supplied to the
control board.
1. If the bin switch light is on with the water curtain
closed, the fuse is good.
Disconnect electrical power to the entire ice
machine before proceeding.
2. Remove the fuse. Check the resistance across the
fuse with an ohm meter.
Reading
Open (OL)
Closed (O)
6-38
! Warning
Warning
!
Result
Replace fuse
Fuse is good

BIN SWITCH

Function
Movement of the water curtain controls bin switch
operation. The bin switch has two main functions:
1. Terminating the harvest cycle and returning the ice
machine to the freeze cycle.
This occurs when the bin switch is opened and
closed again within 7 seconds during the harvest
cycle.
2. Automatic ice machine shut-off.
If the storage bin is full at the end of a harvest cycle,
the sheet of cubes fails to clear the water curtain and
holds it open. After the water curtain is held open for
7 seconds, the ice machine shuts off. The ice
machine remains off until enough ice is removed
from the storage bin to allow the sheet of cubes to
drop clear of the water curtain. As the water curtain
swings back to the operating position, the bin switch
closes and the ice machine restarts, provide the
three-minute delay has expired.
The water curtain must be ON (bin switch(s) closed)
to start ice making.
Specifications
The bin switch is a magnetically operated reed switch.
The magnet is attached to the lower right corner of the
water curtain. The switch is attached to the evaporator-
mounting bracket.
The bin switch is connected to a varying D.C. voltage
circuit. (Voltage does not remain constant.)
NOTE: Because of a wide variation in D.C. voltage, it is
not recommended that a voltmeter be used to check bin
switch operation.
Section 6
Important
Part No. 80-1100-3