Troubleshooting
Dehydrator fails to start:
Check the power cord to be sure power is reaching the
dehydrator. Measure the voltage at the terminal strip.
Disconnect the power cord and check the position of the
circuit breaker.
If the circuit breaker is off, the cause of the overload may
be shorted wiring, shorted motor windings, or a short in the
pressure sensitive switch.<
Dehydrator stops and starts repeatedly before reaching
preset transmission line pressure:
Check for large leaks in the transmission line or connecting
line tubing.
Check the connecting line tubing for restrictions such as
kinks. Reroute the tubing to remove kinks.
Check to see if the transmission line is too restrictive for
the pressure delivered by the dehydrator; that is, the dehydrator
produces more pressure than the line can handle. If the line is
too restrictive, connect a pressure regulating tank between the
dehydrator and the line. The tank outlet pressure can then be
adjusted to suit the transmission line.
Dehydrator runs excessively - 30% to 50% more than normal:
Check the dehydrator running time and frequency of operation.
An antenna system incorporating an automatic dehydrator should be
designed so that the dehydrator runs no more than 72 minutes and
no less than 10 minutes during a 24-hour period. If the running
time is longer or operation occurs more frequently, there is major
leakage in the system.
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Check for external or internal leakage. Disconnect
the connecting line tubing from the dehydrator outlet, block the
outlet with your finger, and run the dehydrator. The dehydrator
should shut off at the preset pressure of 8 psi within one minute.
If it does, the leakage is either in the connecting line or
or transmission line. If the dehydrator continues to run after
one minute, there is internal leakage.
Check the dehydrator for internal leaks. Cap the outlet, run
the dehydrator, and apply a soap solution at all fittings and around
components. Check components such as the back pressure regulator
valve, pressure sensitive switch, humidity indicator, and the
pressure gauge. Bubbling indicates leakage. Tighten leaky fittings
and replace leaky components. Then recheck operation with the outlet
capped; it should shut off at 8 psi within one minute.
Dehydrator either does not start at pressure of 3 psi or shut
off at 8 psi:
Readjust the limits of or replace the pressure sensitive switch.
Replace the motor-compressor unit or rebuild the compressor
using compressor repair kit 39878.
Color of humidity indicator either pink, brown, or white:
Measure the delivery air flow rate. It should be at least
10 to 12 cubic feet per hour. A flow rate that is too low or too
high indicates that the back pressure regulator valve needs readjustment
or it is defective. If this adjustment or replacement does not
affect the flow rate, the compressor should be repaired or replaced.
Check solenoid valve cycle time. Incorrect cycle timing is
caused by a defective solenoid timing motor or solenoid switch.
Run the dehydrator for 12 hours and check the humidity indicator.
If there is little or no color change, replace the dryer assembly.
(The dryer assembly includes the solenoid valves.)
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