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washer itself (fig. 5-18). This thermostat can
control two temperature settings, the high
temperature for washing and the low temperature
for sour. The low temperature is controlled by
turning the black pointer on the thermostat to the
desired temperature setting. Once the temperature
control slot is reached on the program chart, hot
water is added to the washer and tempered with
cold water to reach the desired temperature you
set on the thermostat. The desired temperature
will always be the lower temperature on the Navy
wash formula.
To set the high temperature, move the red
pointer on the thermostat to the high temperature
setting on the wash formula. During the break
suds, hot water is admitted into the washer. The
hot water stops when water levels are reached and
then steam is admitted until the high temperature
is reached. The third pointer in the thermostat
indicates the actual temperature in the washer.
Water Levels
Water levels in the washer are controlled by
slots 5 through 7 on your program chart (fig.
5-17). Wash formulas are based on certain
amounts of water. If the amounts are other than
indicated, your concentration of supplies will not
be correct. Water levels are preset at the factory;
however, they may have to be adjusted to
conform to Navy wash formulas. Water levels
should be reached before steam is admitted into
the washer. If you notice steam being admitted
into the washer before water levels are reached,
the cutting of the program chart should be
rechecked.
Figure 5-18.—Washer extractor temperature control.
Automatic Supply
The automatic injection of supplies into the
water is done by slots 11 and 12. The automatic
supply bins that are located on the right side of
the washer extractor contain four bins. Navy wash
formulas I and II require three supplies and Navy
wash formula III requires two supplies. Therefore,
you will only use two bins because sour and starch
can be added together. This means only two of
the four slots on the program chart will be cut
to allow these supplies into the washer drum.
SAFETY FEATURES
All laundry personnel should be familiar with
washer extractor safety features to prevent
personal injury and/or damage to equipment. The
laundry supervisor should prepare a locally
prepared document that covers all safety features
noted in the equipment technical manual. The
safety features listed below are generally true for
all models; however, check your technical manual
for any additional safety features.
1. During the wash cycle the washer extractor
will cut off if the outer shell door is opened.
2. The outer shell door of the washer extractor
will not open during the extract cycle because of
an interlock switch.
3. Both hands must be used to operate the jog
switches on the control panel.
4. The control switch on the control panel or
the master switch on the programmer can be used
as emergency stops.
5. The vibration switch is installed to stop
incorrectly loaded machines during extract.
6. The air pressure switch will not allow the
machine to operate on less than 50 pounds of air
pressure for the wash cycle and 80 pounds of air
pressure for extract.
7. The automatic brake engages during power
loss or emergency stop.
8. The positioning interlock switch is installed
to eliminate the possibility of having the wash
motor activate while the outer shell door is open.
PREOPERATIONAL CHECKS
Before actually operating the washer extractor,
be sure you are ready by doing the following:
Check your steam supply (100 pounds is
ideal).
5-24
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