Whirlpool 1997 "E" Service Manual page 10

The normally-closed (N.C.) contacts of relay 4 provide a potential circuit for the Base Thermal
Fuse. If the base of the oven exceeds 133˚F, the thermal fuse contacts close, and a circuit for
the low-speed side of the blower motor is completed, which turns the motor on. The low-speed
blower will operate until the base temperature drops below 104˚F and opens the thermal fuse
contacts, and turns off.
L1
20A LINE
FUSE
BK
When the low-speed fan is selected by the user at the control panel, relay 3 and the normally-
closed (N.C.) contacts of relay 4, complete the circuit to the low-speed windings of the blower
motor and turn it on.
L1
20A LINE
FUSE
BK
When the high-speed fan is selected by the user at the control panel, the normally-open (N.O.)
contacts of relay 4 complete the circuit to the high-speed windings of the blower motor and turn
it on.
L1
20A LINE
FUSE
BK
BK
BK
MAGNETRON CAVITY
THERMAL THERMAL
FUSE FUSE
BK
RD
MAGNETRON
CAVITY
THERMAL
THERMAL
FUSE
USE
BK
RD
MAGNETRON
CAVITY
THERMAL
THERMAL
FUSE
FUSE
MICROCOMPUTER
BOARD
LOW-VOLTAGE
TRANSFORMER
RD
3 1
RELAY 4
11
MICROCOMPUTER
BOARD
LOW-VOLTAGE
TRANSFORMER
RD
3
RELAY 4
RELAY 3
MICROCOMPUTER
BOARD
LOW-VOLTAGE
TRANSFORMER
RD
3
RELAY 4
1-2
W
CAPACITOR
RD RD
W
YL
(HIGH) (C)
BASE
BLOWER
THERMAL
MOTOR
FUSE
W
1
CAPACITOR
RD RD
BL
PK/W
9
(C)
(LOW)
BLOWER MOTOR
W
1
CAPACITOR
RD RD
BL
BK
13
(HI) (C)
BLOWER MOTOR
N
BL
N
N