113395 - 9
Maytag Co.
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3. Heat Circuit Operational Test
a. Gas Models
1) When the dryer is first started (during initial start-up), the burner has a tendency not to ignite on the
first attempt. This is because the gas supply piping is filled with air, so it may take a few minutes for
this air to be purged.
2) The dryer is equipped with a Direct Spark Ignition (DSI) system, which has internal diagnostics. If
ignition is not established after the first attempt, the heat circuit DSI module will “LOCKOUT” until
it is manually reset. To reset the DSI system, open and close main door and restart dryer.
NOTE:
During the purging period, check to be sure that
ALL
gas shutoff valves are open.
3) Once ignition is established, a gas pressure test
should be
taken at the gas valve pressure tap of
each dryer to ensure that the water column (W.C.) pressure is correct and consistent.
NOTE:
Water column pressure requirements (measured at the gas valve pressure tap):
Natural Gas ............................ 3.5 inches (8.7 mb) water column.
Liquid Propane (L.P.) Gas ...... 10.5 inches (26.1 mb) water column.
IMPORTANT:
There is no regulator provided in an L.P. dryer. The water column pressure
must be
regulated at the source (L.P. tank) or an external regulator
must be
added to each
dryer.
4. Make a complete operational check of
ALL
safety-related circuits (i.e., lint drawer switch and sail switch).
NOTE:
To check for proper sail switch operation, open the main door and while holding main door
switch plunger in, start dryer. Dryer should start but heat circuit
should not be
activated (on).
If heat (burner) does activate, shut the dryer off and make necessary adjustments.
5. Reversing tumbler dryers should never be operated with less than a 85 lb (38 kg) load (dry weight), since
the load’s weight affects tumbler coast time during a direction reversal command. It is important that the
tumbler come to a complete stop prior to starting in opposite direction.
a. Microprocessor Controller (Computer) Dryer Models
1) Spin and dwell (stop) times are not adjustable in the Automatic Mode and have been preprogrammed
into the microprocessor controller (computer) for a 120-second spin time and a 5-second dwell
(stop) time.
2) Spin and dwell (stop) times are adjustable in the Manual (Timed) Mode.
b. Dual Timer Dryer Models:
Spin and dwell (stop) times are adjustable at the reversing timer.
TUMBLER COATING
The tumbler is treated with a protective coating. It is suggested to dampen old garments or cloth material with
a solution of water and nonflammable mild detergent and tumble them in the tumbler to remove this coating.
Summary of Contents for MDG-120PHV
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