17
the end of the water return line. Use a piece of small
wire or a pipe cleaner to clean the Water Metering
Orices.
12.6.6 A Low Temperature Shutdown will occur
if the temperature of the water falls below 35°F.
Typically a Standby Dryer would experience this
condition from being exposed to the cold. Faulty
ventilation systems in the winter time is one possible
example. The SmartTech Dryer will automatically
transition to a Major Alarm from Standby status
should this occur.
12.7 COMPRESSOR CIRCUIT BREAKER
ALARM
12.7.1 The compressor circuit breaker (10) may trip
if the supply voltage is very low or very high. Usually
voltage extremes also cause occasional chattering
of the purge solenoid valves (7), early failure of
water level oat switches and associated electrical
problems. If this seems the possible case, have the
line voltage checked by a qualied electrician, while
the dehydrator is operating.
12.7.2 If the supply voltage is proved to be correct,
check the condition of the compressor electrical
contactor (14). If the contacts are discolored or
burned, replace the contactor. Use an amp meter to
determine if the compressor load is greater than the
circuit breaker (10) rating and replace the compressor
(25) or the circuit breaker as indicated. To replace the
contactors or Compressor Circuit Breakers, the front
panel must be carefully lowered. Remove the seven
(7) outer screws from the front panel and slowly lower
the front panel by swinging outward while keeping
the bottom edge against the outer frame members.
DO NOT put excess weight on the front panel while
it’s in the down position. Replace the compenents as
required and re-secure the front panel to the frame.
12.8 POWER LOSS/BROWNOUT FAULT
ALARM
12.8.1 The Power Loss Alarm will be displayed if
there is a low voltage condition or complete loss of
electrical service. Once the power has been restored
the dryer will restart automatically. NOTE: If an
ATS300 system on a UPS backup is connected to the
Dryer during a power failure, power from the ATS
Bus Cables will provide backup power to the front
display and POWER LOSS will be indicated.
This is also the case if the Dryer ON/OFF switch is
left OFF. 12.8.2 If the Power Loss alarm is known not
to be the result of an actual power interruption, and
especially if it occurs repeatedly, an external wiring
defect may be indicated. Have the power supply
checked by a qualied electrician. It is possible for very
high electrical spikes to exceed the spike suppression
capability of the circuitry. Spikes may result from a
faulty ballast or motor switch connected to the same
power source. Loose or high resistance connections
(or a faulty line circuit breaker) in the electric service
to the dehydrator can also cause problems. Should a
nuisance Power Loss Alarm or Brownout Fault occur
due to a low voltage condition, it’s recommended to
have a qualied electrician monitor the AC lines with
proper recording equipment to verify the problem.
12.8.3 A Brownout Fault is displayed only after 3
concurrent attempts to start. This is an major alarm
and requires local or remote resetting.
12.8.4 For other power loss conditions refer to
Appendix E for fusing and circuit protection
information.
12.9 HUMIDITY ALARM
12.9.1 The humidity sensor, located on the Sensor
Board, is a single chip circuit that measures both
relative humidity and Air Temperature and signals
with a calibrated digital output. A small sample of dry
air from the venting of the system regulator pressure
passes through a 1/4 OD tubing that surrounds the tip
of the sensor. There is no wiring to the sensor. The
Humidity alarm occurs should the Relative Humidity
exceed 5%RH.
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