24
PROBLEM
Moisture down
stream
Apparent controller
display malfunction
High pressure drop
across dryer
SYMPTOM(S)
Inlet and outlet
temperatures are the
same.
Compressor and fan
are running,
exchanger temp high,
pump not running
Display Blank
Unrealistic tempera-
ture displayed
Erratic or inaccurate
temperature readings
Unrealistic pressure
displayed
Outlet pressure
substantially lower
than inlet pressure
System operating
temperature is above
32°F
Outlet pressure
substantially lower
than inlet pressure
System operating
temperature is below
32°F
POSSIBLE CAUSE
Compressor and fan not
running.
Compressor and fan not
running. Controller indicates
compressor is ON.
Defective Pump
Blown Fuse
Board Failure
Probe loose,off connection or
defective probe
Probe not completely in
thermal well
Defective probe
Transducer loose, off connec-
tion or defective transducer
Inlet and outlet valves not
completely open
Inlet and outlet filters blocked
up
Compressor relay / contactor
stuck.
DPC relay bad
Probe not completely in
thermal well
Problem persists
CORRECTIVE ACTION
Check Chiller Temperature
Check MAIN CONTROL fuse.
Compressor relay may be bad, replace
relay
Check for loose wire connections at
contactor or loss of power at control
board
Defective control board - replace as
necessary
Contact your local distributor for further
assistance.
Contact your local distributor for further
assistance.
Check Fuses
Contact your local distributor for further
assistance.
Inspect probe cable and terminal
connection
Replace probe
Inspect probe and check readings
against independent source (eg.
temperature analyzer/pyrometer/ice
bath) both in temperature well and to
ambient
Replace probe
Inspect transducer cable and terminal
connection
Replace transducer
Open valves
Change filter elements
Replace relay / contactor.
Replace relay
Inspect probe and check readings
against independent source (eg.
temperature analyzer/pyrometer/ice
bath) both in exchanger well and to
ambient
Turn dryer off and consult your local
distributor for further assistance
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