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12.5 HIGH AND LOW WATER
SHUTDOWN ALARM
12.5.1 High and Low Water Shutdown may result
from an incorrect water level or from a component
failure in the Water Sight Tube assembly (24). Watch
the Sight Tube water level and restart the dehydrator.
If the water level is high, push the Manual Water
Eject switch (8). If this causes the water level to go
down, clean or replace the double oat switch (20). If
the water level does not change, check for a crimped
drain line outside the dehydrator. If the drain is OK,
but the Manual Water Eject Switch will not cause the
water level to go down, replace the Water Ejector
Solenoid Valve (8).
12.5.2 If High or Low Water Shutdown occurs, but
when restart ed, the water level is normal (at or slightly
below the center oat switch) the top oat switch (19)
or the bottom (double) oat switch (20) is at fault. To
nd out which switch has failed, disconnect the top
oat switch wire harness connector. An ohm meter
will show continuity across the switch leads if the
water is below the switch and the switch is OK. The
switch should go open when the water lifts the oat.
If the top switch is OK, but malfunction continues,
clean or replace the bottom (20) oat switch.
12.5.3 If Low Water Shutdown occurs and the water
level is low (at the bottom oat switch of the double
oat switch assembly (20) when the dehydrator is
restarted, Prime the dehydrator with water (paragraph
7.4). If the water level is below the center oat switch
and water is still ejected through the dehydrator drain,
turn the POWER switch (6) OFF, disconnect one
wire terminal (other than green wire) from the Water
Ejector Solenoid Valve (8). Turn the POWER ON. If
the water is still eject ed, turn off the power, interrupt
electric service to the dehydrator and replace the
Water Ejector Solenoid Valve.
If instead the wire disconnect procedure stops the
water loss, clean or replace the double oat switch
(20). Reconnect the wire to the Water Ejector
Solenoid Valve, restore electrical service and restart
the dehydrator.
12.5.4 If the water loss continues, look for a leak
at the drain outlet tting. Check for leaks under the
compressor (25), under the Separator Tank (35),
Water Filter (39), Water Sight Tube (24), Passive
Air Intake (32) and nally in the Heat Exchanger
(47). When searching for water leaks in areas where
evaporation is high (where there is ventilation air
ow), wrap the suspect tting with a rag or with
aluminum foil wrap. This will allow the moisture to
collect and will help verify a leak if it is present.
12.6 HIGH AND LOW TEMPERATURE
SHUTDOWN ALARM
12.6.1 High Temperature Shutdown will occur
if the water temperature exceeds 160°F. while
the dehydrator is operating. Verify that the room
ventilation and/or air condition ing system is working
properly. Correct as indicated.
12.6.2 An extremely dirty cabinet air lter (46) can
restrict the ow of ventilation air through the heat
exchanger and the cabinet. Replace the cabinet air
lters and the water lter element (40).
12.6.3 With the water temperature above 89°F
verify that the heat exchanger fan (12) is operating.
The fan is visible from the top of the dehydrator. If
the fan motor is inoperative, replace both the fan /
motor assembly (12) and the capacitor (11).
12.6.4 If the fan and the lters are not at fault and
High Temperature Shutdown persists, verify that
the Water Separator Tank (35) is very hot. The
temperature of the tank must reach approximately
160°F. (far hotter than normal) before a legitimate
High Temperature Shutdown will occur. If the tank
temperature is about normal (90 to 120°F.) but the
condition continues, replacement of the thermistor
assembly (17) is indicated.
12.6.5 If High Temperature Shutdown occurs and
the above procedures have been performed, a very
signicant water ow reduction is indicated. Be sure
that a water circuit tube is not crimped. If there is
no tube restriction, the restriction is in the Metering
Orice which is located on the compressor tting at
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