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 TM 55-1905-220-14-9
4-42. WASHER/DRYER - MAINTENANCE INSTRUCTIONS (Continued).
b.
Dryer Operation.
(1)
Dryer timer.
(a) The timer is the electrical control which determines how long the dryer will run before automatic
shutoff at the end of the cycle. On timed cycle settings the timer motor will advance the internal cams opening
the contacts as indicated on the bar chart.
BAR CHART TO RIGHT REPRESENTS
ONE COMPLETE REVOLUTION OF
TIMER SHAFT
SHADED PORTION OF BAR CHART
INDICATES THE PROPORTIONAL
TIMES THAT INTERNAL TIMER
CONTACTS ARE CLOSED
(b) During Automatic cycle operation the Purple terminal contact is not closed continuously but
alternates with open and closed segments as noted on the bar chart. During the periods of operation, with the
Purple or timer motor operating contact open, current for timer motor advance is from contact No. 2 of the
temperature control thermostat. This contact is closed only when the drum air temperature requirement has
been satisfied and the control thermostat contacts have been transferred from No. 3 to No. 2.
(c) Should the timer motor fail to advance the timer during automatic cycle settings and advance
normally during timed cycle settings because of limit switch cycling the product and its installation should be
checked for the following possible causes:
1
Restricted lint screen.
2
Excessive duct length or reduced diameter.
3
Stuck closed exhaust duct hood.
4
Overloaded drum.
(d)
The dryer timer has an automatic and timed cycle. The last five minutes of both cycles are cool
down.
Change 1
4-1064
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