Pneumatech AD 1250 - Faults and Remedies

Instruction book
9828 0931 61 39
Faults and remedies
Condition Fault Remedy
1 Pressure dewpoint too high Air inlet temperature too high Check and correct; if
necessary, install a pre-cooler
Ambient temperature too high Check and correct; if
necessary, draw cooling air via
a duct from a cooler place or
relocate the dryer
Air inlet pressure too low Increase inlet pressure
Adjust the pressure
switch
Dryer capacity exceeded Reduce air flow
Shortage of refrigerant Have circuit checked for leaks
and recharged
Refrigerant compressor
does not run
See 3
Evaporator pressure too high See 5
Condenser pressure too high See 2
2 Condenser pressure too
high or too low
Fan or fan motor out of order Check fan/fan motor
Ambient temperature too high Check and correct; if
necessary, draw cooling air via
a duct from a cooler room or
relocate the dryer
Condenser externally clogged Clean condenser
3 Compressor stops or does
not start and PDP is ON
Thermal protection of
refrigerant compressor
motor tripped
Wait for reset of thermostatic
protection
Overload fan motor
protection tripped
Reset the overload motor protection
Phase sequence relay
indicate wrong rotation
Change sequence of two phases
High pressure switch
tripped
Reset the high pressure switch
Compressor does not start
and PDP is OFF
Fuses of transformer tripped Change fuses
Circuit breaker (in customer
scope) tripped
Check the electrical causes
4 The condensate drain
remains inoperative
Drain system clogged Have system inspected
Filter upstream of the
solenoid valve clogged
Check filter
Timer or solenoid
exhaust valve out of
order
Check timer and solenoid valve