Whirlpool 4322452 - Manual (Page 62)

Page 4-18
THE SELF-CLEAN OVEN DOOR LOCKING SYSTEM
At any time a range is in a self-clean operation, it needs to provide a safe environment for the
customer. A self-clean cycle will reach temperatures of over 800˚F during its 2- to 4-hour cycle. To
prevent the consumer from accessing the oven while these extreme temperatures are present,
every self-clean range is equipped with an oven door lock system. This system locks the oven door
whenever the oven cavity temperature exceeds 600˚F. The system can be activated by the
consumer manually, using a lock lever, or electrically. Whirlpool ranges utilize an electronic locking
system to assure that the range will not operate unless the oven door is safely locked during high
temperatures.
The electronic system consists of:
• An electronic control.
• A door latch switch.
• A door latch solenoid.
• A door latch switch to provide feedback to the microcomputer board.
• A door latch. NOTE: The oven sensor is also a critical component of the system because
it monitors temperatures needed to control the system.
The Self-Clean System begins at the control board (see Figure 4-29). As the CLEAN function is
programmed into the control and the START pad is pushed, the latch relay on the microcomputer
board closes for less then a second. This allows just enough time to provide a 110 volt pulse to the
solenoid.
The solenoid is a spring-loaded “push-push” mechanism. As voltage is applied, the solenoid
pushes against the spring-loaded plunger, and extends it. This operation only requires a pulse of
electricity. As the plunger is extended, the next pulse of electricity will again push against the spring
loaded plunger, and retract it. This “push-push” function can be related to the extension and
retraction of a fountain pen.
L1 N
W BK
BK BU
BR
BU GY
GY Y
W
W
V V
OVEN CONTROL
OVEN CONTROL
TRANSFORMER
SENSOR
BAKE RELAY
BAKE VALVE
BAKE IGNITOR
BROIL RELAY
LATCH RELAY*
P3-4
P4
P3-1
P1-6
(N.O.)
DOOR LATCH
SWITCH
DOOR LATCH
SWITCH
LATCH
SOLENOID
P1-5 P1-1
P1-3
P1-7
* PULSE 1 SECOND
P5 P2-1
P2-4
Figure 4-29