The Self-Clean Oven Door Locking System - Whirlpool 4322452 Service Manual

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
BK
OVEN CONTROL
BROIL RELAY
BK
P3-1
LATCH RELAY*
* PULSE 1 SECOND
BAKE IGNITOR
BU
P3-4
LATCH
(N.O.)
SOLENOID
BR
P4
OVEN CONTROL
P5
BAKE VALVE
W
P2-4
V
P1-6
Y
P1-1
BU
P1-3
W
Figure 4-29
Page 4-18
TRANSFORMER
W
P2-1
BAKE RELAY
V
P1-7
SENSOR
DOOR LATCH
SWITCH
GY
P1-5
DOOR LATCH
SWITCH
GY
N