Maytag 111990" Automatic Dryers Service Manual page 31

increases. With this in mind, let's look
at the circuitry.
With the timer set in this position, the
circuits are completed to the heat
source and drive motor.
POWER
Note: The switch controlling the timer
motor is open.
TO HEAT
CYCLING
THERMOSTAT
MOTOR
TO TIMER
WITH CYCLING THERMOSTAT
CALLING FOR HEAT
(NORMAL)
At the beginning of the cycle the load is
damp, the heat input is used up in
evaporation of the moisture and there
is little increase in the air temperature.
As the load becomes drier, less heat is
used up in evaporation and the temper-
ature of the load and exhaust air starts
to rise. The exhaust air is being
pushed over the regulating thermostat
and as the temperature of the exhaust
air rises so does that of the thermostat.
Once the thermostat reaches a temper-
ature of approximately 140 0 F the circuit
is broken to the heat source and at the
same time is completed to the timer
motor.
DRIVE MOTOR
HEAT SOURCE
TIMER MOTOR
l'
TIMER
SET HERE
When the timer is set to a degree of
dryness, the circuit is completed to the
heat source and the drive motor. The
difference between this control and a
,
standard timer operated dryer is the
fact that the timer motor is not initially
in the circuit. To see how the control
works, let's assume that the load to be
dried is a normal load with the gar-
ments of somewhat uniform weight, the
auto regular setting is selected and the
dial set on the middle mark between
"more dry" and "less dry".
As indicated in the timer schematic
below, the maximum timer controlled
drying time on an auto-dry regular
setting is approximately 31 minutes
plus a five"minute cool-down. Since we
set the dial to the middle mark we have
set the timer at about the mid point or
for approximately 15 minutes of timed
dry.
ED/GD401 1090
SECTION 3. SERVICE PROCEDURES
3-3