Product Manual

44 Edition 03/2015 Cod. 9828093011 00-
ENGLISH
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19.3 TROUBLE-SHOOTING FOR REFRIGERANT DRYER
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ALL WORK MUST BE PERFORMED BY PROFESSIONALLY SKILLED PERSONNEL. BEFORE CARRYNG OUT ANY
MAINTENANCE JOBS IT IS MANDATORY TO STOP THE MACHINE AND DISCONNECT IT FROM THE POWER MAINS.
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N.B. OPERATIONS MARKED   MUST BE PERFORMED BY PROFESSIONALLY SKILLED PERSONNEL APPROVED THE
MANUFACTURER
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FAULT FOUND POSSIBLE CAUSES OBSERVATIONS
1) No compressed air passes through the
dryer outlet
1A) The
pipes are
f
rozen inside
 -Hot gas by-pass the bypass valve is
broken or out-of-calibration
-The room temperature is too low and
the evaporators piping are obstructed
with
ice
2) Presence o
f
condensate in the pipings.
2A) The
condensate separator does not work
correctly
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2B) The dryer is working outside its rating
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2C) The dryer is working under bad
excessive conditions.
 -Check
the solenoid exhaust valve
 -Check the drainage timer
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-Check the flow rate of treated air
-Check the room temperature
-Check the air temperature at the drier
inlet.
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-Clean the condenser.
 -Check dryer fan operation.
3) The compressor head is very hot
(> 55 °C – 131 °F).
Make reference to 2B
Make reference to 2C
3A) The cooling circuit is not working with the
right gas charge
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 -Check if there are leaks of refrigerating
gas.
 - Charge it again.
4) Motor cuts out on overload
Make
reference to 2B
Make reference to 2C
Make reference to 3A
5) The motor hums and does not start. The line voltage is too low.
You switched the machine off and on
again without leaving enough time for
the pressure balancing.
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The starting system of the motor is
defective.
-Contact
the electric power company
-Wait a few minutes before starting the
machine again.
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 -Check the running and starting relays
and condensers (if any)
6) The machine has stopped and does not
restart even after a few minutes.
The overload protection with has
intervened: make reference to
2B-2C-3A.
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The motor has burnt out.
7) The compressor is very noisy.
Troubles
with the internal mechanical
parts or with the valves
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PART “B”
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THIS PART “B” OF THE INSTRUCTIONS MANUAL IS RESERVED FOR PROFESSIONALLY SKILLED PERSONNEL
APPROVED THE MANUFACTURER