Basic Operation; Power; Door Lock - Maytag Commercial MYR20 Service Manual

pOWer

Power supply voltage initiates at the power
disconnect switch mounted to the upper back
panel and flows through the line filter to the
controls transformer and drive contactor. The
controls transformer provides 220VAC to the
ACU and to the liquid supply board. Protection
is provided by 1amp fuses. The drive
contactor supplies line voltage to the VFD only
when cycle is initiated or in diagnostic test
mode.

BaSiC OperaTiOn

3-1

DOOr LOCK

The door lock assembly is non-serviceable
and only replaceable as a complete
component. There are three internal switches
to providing lock status to the ACU. With
the washer idle and the door open, the door
detection and door locked switches will be
in an open state and the door unlocked
switch closed. When the door is closed with
the door pin making initial insertion into the
lock assembly the door detection switch will
change from open to closed. The door lock
switch remains open and the door unlock
switch remains closed. When a cycle is
initiated, the ACU will provide 12VDC to the
door lock motor and pull the door into a locked
position. This will change the door locked
switch to closed and door unlocked switch to
open. The door detection switch will remain
closed.