Troubleshooting - Gardner Denver RPD Series Instruction Manual

TROUBLESHOOTING GUIDE
SYMPTOM
A. Water downstream of dryer
B. High pressure drop across
dryer
C. Dew point indicator in red
area
D. Refrigeration system not
functioning properly
1. Compressor on light off
2. Refrigerant compressor
cycles on and off
10
POSSIBLE CAUSE(S)
1. Residual free moisture remaining
in downstream pipelines
2. Air by-pass system is open
3. Inlet and Outlet connections are
reversed
4. Temperatures surrounding air
lines downstream of dryer have
dropped below dryers dew point
rating
5. Excessive free moisture (bulk
liquid) at dryer inlet
6. Condensate not being automati-
cally drained
Drain mechanism is clogged or
inoperative.
Drain line is restricted or frozen.
Electric drains–timer not set to
allow for sufficient condensate
removal
7. Dryer overloaded resulting in
elevated dew point.
8. Refrigeration system not func-
tioning properly resulting in
elevated dew point.
1. Excessive air flow
2. Freezing of moisture in evapora-
tor because of refrigeration
system improperly functioning.
3. Separator or optional Oil Removal
filter element clogged.
1. Dryer overloaded resulting in high
air outlet temperature.
2. Refrigeration system not func-
tioning properly resulting in high
air outlet temperature.
3. Dryer is running with no load
a. Power failure
b. Line disconnect switch open
c. Blown fuses, open breaker
d. Faulty wiring, loose terminals
a. High or low ambient conditions
b. Air-cooled models–Dirty, clogged
condenser fins, obstructed air
flow across condenser, or non
functioning fan motor or fan
control switch.
CORRECTIVE ACTION
Blow out system with dry air
Check valve positions
Check for correct connection
Insulate or heat trace air lines exposed to
low ambients or dry air to lower dew point
Install separator ahead of dryer
Replace drain mechanism if inoperative
Open drain line
Electric drains–reset time so that all liquid
is discharged
Check inlet air temperature and pressure,
flow rate (compressor capacity) and
ambient air or water temperature.
See D below
Check flow rate
See D below
Replace filter element(s).
See A 7
See D below
Light will go out when air flow is estab-
lished
Check power to unit
Close disconnect switch
Check for continuity
Have electrician check electrical
connections
Check min./max. temperature ranges
Clean condenser and check for free air
flow, if problem persists contact qualified
refrigeration repairman or manufacturer's
service department.