Maytag 111990" Automatic Dryers Service Manual page 32

POWER
CYCLING THERMOSTAT
HAS REACHED TEMPERATURE
(OPEN)
At this point the unheated air is cooling
the load and the timer motor is
advancing the timer towards the off
position.
In this example, after a total of approxi-
mately 13 minutes of heat off time the
timer will have advanced to the point
where Cam 2 closes the timer motor
switch which in turn advances the timer
out of the heat portion of the cycle and
into the cool-down period.
Each time the thermostat cycles the
heat period is shorter and the heat off
(timer motor on) time is longer.
will take a relatively long period of
time. By the same token, the moisture
content and the evaporation rate taking
place during the first heat off period
makes it shorter than subsequent heat
off periods.
CYCLING
THERMOSTAT
TO HEAT
MOTOR
TO TIMER
As the temperature of the tumbler, the
items being dried and the exhaust air
decrease, so does the temperature of
the thermostat. When the thermostat
cools to a temperature of approximately
125 0 F. the thermostat returns to its
normal position breaking the circuit to
the timer motor and again completing
the circuit to the heating element or gas
valve.
A selection of the middle mark is a
good starting point. Experience gained
from drying a few loads will enable the
operator to pick a point, either more or
less dry, which is most pleasing. Once
this point is determined, it can be used
for most loads as the automatic control,
based upon time and temperature, will
automatically adjust itself to the size of
load.
Note: The temperatures quoted are the
operating temperatures of the thermo-
stat and not the temperature of the
clothing or exhaust air. Because of its
mass, the thermostat will heat up and
cool down slower than the air temper-
ature.
Because of the moisture content and
the evaporation rate, the first temper-
atur'e rise and cycling of the thermostat
\.
If the operator is drying a poorly mixed
load; bulky items such as cotton socks
along with lightweight flat items it
would be desirable to move the dial to
the "more dry" so that more time is
available to condition the load or to
allow the moisture to surface on the
bUlky items. This is not necessary on a
more uniform load of either bulky or
lightweight items.
ED/GD401 1090 SECTION 3. SERVICE PROCEDURES
3-4