Troubleshooting - Gardner Denver 9VXRD Series Instruction Manual

TROUBLESHOOTING GUIDE
SYMPTOM
A) Water downstream of dryer
B) High pressure drop across
dryer
C) High Temperature Alarm
D) Refrigeration system not
functioning properly
1. Power on light off
2. Refrigerant Suction Pressure
Gauge in red area
3. Refrigerant Suction Pressure
Gauge in blue area
4. Refrigerant pressure cut out light
on (with on/off switch in on
position)
16
POSSIBLE CAUSES
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 automatically
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 functioning
properly resulting in elevated dew point.
1. Excessive air flow
2. Freezing of moisture in evaporator
because of refrigeration system
improperly functioning.
1. Dryer overloaded resulting in high air
outlet temperature.
2. Refrigeration system not functioning
properly resulting in high air outlet
temperature.
3. Unit functioning normally but thermostatic
switch is malfunctioning or not securely
mounted.
a. Power failure
b. Line disconnect switch open
c. Blown fuses, open breaker
d. Faulty wiring, loose terminals
a. Refrigeration compressor not running
b. High inlet air temperature
c. High ambient air temperature
d. 800-2300 models - compressor
rotation incorrect
a. Hot gas by-pass valve improperly set
b. Low on refrigerant
a. High or low ambient temperature
b. Air-cooled models - Dirty, clogged
condenser fins, obstructed air flow across
condenser, or non functioning fan motor
or fan control switch.
c. Water-cooled models - Cooling water
temperature too high, or flow too low,
faulty water regulating valve, clogged
water strainer.
d. Start-up - high pressure switch may
have tripped.
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
Rebuild 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
See A 7
See D below
Contact qualified refrigeration repair-
man or manufacturer's service depart-
ment
Check power to unit
Close disconnect switch
Check for continuity
Have electrician check electrical
connections
Contact qualified refrigeration repairman
or manufacturer's service department.
Check temperature
Check temperature
See special instructions Section 2.2.
Contact qualified refrigeration repairman
or manufacturer's service department.
Check ambient temperature range
Clean condenser and check for free air
flow, if problem persists contact
qualified refrigeration repairman or
manufacturer's service department.
Clean strainer, check water flow and
temperature, if problem persists contact
qualified refrigeration repairman or
manufacturer's service department.
Manually reset and restart without load.