Maytag MDG25PN Service Manual page 28

The broken belt switch is in series with the
motor and has one of its leads connect directly
to a terminal on the motor thermal overload.
If either the broken belt switch or the motor
thermal overload opens the circuit, it will stop
the motor, which in turn will cause the motor
centrifugal switch to open and change the
position of the motor switches, opening motor
switch 1M to 2M, which opens the circuit to
either the electric element or the gas coil
circuit from a leg of the power supply.
Door switches on this dryer are wired in
series with each other, but are not wired in
series with any other components. When
a door switch is opened or closed it is the
Central Control Unit (CCU) that senses this
and activates or deactivates the relays on
the board. Whenever the door switch state
is sensed as closed in the CCU it allows the
Select Cycle or Reselect Cycle to display
on PD or PN models converted to PR after
correct vend price is applied. On PN models
set-up for free vend the display would show
Select Cycle after the door switch state is
changed and then detected as closed.
With all pay for use commercial dryers,
whenever the power is supplied to the dryer
and the cycle has been started, time continues
to count down even if the cycle is interrupted
by the opening of the door switch.
Dryers set as On Premises Laundry (OPL),
set for free vend; when a cycle is interrupted
with a door opening or power failure, that
cycle will be cancelled, and a new full cycle
will need to be started if additional dry time is
required.
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