60HZ Wiring Schematic Dryer Idle - No Coins Added
Top Dryer Used For This Example
110 VAC 60Hz is supplied to the main power terminal block, L1 power, N=neutral, plus ground. BLK/Red
coming o of L1 and BLK/BLU coming from N power the R1, and R2 motor relays. Red wire from L1 and
the blue wire from N supply power and neutral to the step down transformer. After the stepdown trans-
former the control is protected by a 2.5 Amp fuse in the black wire. When there is power to the dryer the
Computer Board will be powered and the display lighted from the 24 VAC secondary side of Control Step
Down Transformer. 24 VAC from here is also on one side of the door switch on a black wire. Closing the
loading door allows 24 VAC to pass on to the Computer Board on two blue wires. One blue wire makes 24
VAC available to one side of the Motor Run Relay on Computer Board. The other blue wire provides a 24
VAC signal to the Computer Board telling it that the door is closed and door light on the computer board
should be illuminated.
Coins Added - Motor Starting and Running
Top Dryer Used For This Example
As each coin is added the Coin Switch closes and completes a circuit to the Computer Board. The Com-
puter Board counts these signals and registers them against time. The time will display once the Start But-
ton for Upper or Lower is pushed. When the Start Button is pushed again the Computer Board Motor Run
Relay closes on the computer. With this Relay closed, 24 VAC is supplied to the Motor Control Relay (R1)
on the red wire and also a violet wire going down to motor. The motor LED on the computer board should
be illuminated anytime the computer calls for the motor to operate. With (R1) engaged and 110 VAC at
motor the Motor Start Switch in motor is drawn in to the start position. In this position the incoming power
110 VAC is supplied directly to the main run winding and through the Start Capacitor to the Auxiliary Wind-
ing (start winding). As the Motor comes up to speed, the centrical switch inside motor opens the circuit to
the Start Winding and closes the circuit to allow 24 VAC to pass to the Gas Relay on the Computer Board
on the other violet wire.The heat circuit in the dryer can not operate if the motor is not running. The gas
LED on the computer board will be illuminated when Computer Board calls for the heat after Motor Cen-
trical Switch has closed.
Heat Circuit
Top Dryer Used For This Example
With the Drive Motor running and 24 VAC provided to the Computer Board Gas Relay, it will close if Com-
puter Board senses programmed temperature is needed. The violet wire changes to an orange wire out
of the Computer Board Gas Relay. When this relay closes it provides 24 VAC to the High Limit Thermostat.
The High Limit Thermostat is normally closed. (It will open, turning o the heat circuit, if the dryer can’t
move enough air from problems such as an exhaust restriction or other problems.) 24 VAC now goes
through to the normally open Air Switch (Sail Switch) on the brown wire. This switch is closed only if the
dryer is running and has the correct air ow. With the dryer running and the Air Switch closed, 24 VAC is
supplied to the normally closed upper manual reset Overtemp Thermostat on the gray wire and changes
to the black wire out of switch and then changes to red wire and goes to the 1.5 amp in-line fuse that pro-
tects the Upper Ignition Controller(GREY BOX). With 24 VAC now supplied to the Upper Ignition Controller
(GREY BOX) it will then send high voltage to the Spark Ignition Electrode via the High Voltage Lead Wire
(this lead looks like an automotive spark plug wire). The Ignition Control Module (GREY BOX)simultane-
ously sends 24VAC to the Gas Valve Coil which open the Gas Valve and allows gas to pass through to the
main burner. When ignition occurs the high voltage sparking stops and if Ignition Control Module (GREY
BOX) gets a ame sense signal it will allow gas valve coil to remain energized and continue burner opera-
tion. If ignition does not occur, the Ignition Control Module (GREY BOX) will spark for 10 seconds before
locking out.
52
Part # 8533-090-001 7/21
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