Start-Up/Operation; Shutdown; Maintenance - Gardner Denver RGD Series Instruction Manual

START-UP/OPERATION

Follow the procedure below to start your dryer. Failure to follow
the prescribed start-up procedure will invalidate the warranty. If
problems arise during start-up, call your distributor.
Refer to Serial Number Tag for dryer operating
capacity. Do not exceed recommended capacity.
Drain connections must be made before the dryer can be op-
erated. The dryers are fully automatic and require no auxiliary
controls.
1. Turn the dryer ON/OFF switch to OFF.
2. Check that the main electrical supply voltage matches the
voltage specified on the dryer data plate.
3. Check proper connection and support of compressed air
lines to the dryer; check bypass valve system, if installed.
4. SLOWLY pressurize the dryer. The outlet valves of the dryer
should be closed to prevent flow through the dryer.
5. Turn on the main electrical power to the dryer.
6. Ensure adequate ventilation for air-cooled dryers.
To start dryer:
1. Turn the power switch to ON. The refrigerant compressor
will turn on.
2. Allow the dryer to run 15 minutes. Confirm that the tem-
perature indicators are in the green zone.
3. SLOWLY open the dryer outlet valves permitting flow
through the dryer.
4. Confirm that condensate is discharging from the drain valve
by pressing the "Push-to Test" button.
5. Check drain valve timing. See Automatic Drain Valve section
for drain valve adjustment procedure.
6. Confirm that the inlet air temperature, pressure and airflow
to the dryer meet the specified requirements (see Engi-
neering Data section).
7. Confirm that the condensate lines from the drain valve
discharge into a collection tank or an environmentally-
approved disposal system.
The dryer is designed to run continuously. Let the dryer run
even when the demand for compressed air is interrupted; the
dryer will not freeze up.

SHUTDOWN

When the dryer must be shutdown for maintenance or other
reasons, use the following procedure.
If electrical repairs must be made:
1. Turn off the power switch.
2. Disconnect the main power supply.
3. Lock out and tag the power supply in accordance with OSHA
requirements.
If mechanical repairs are to be made or service is performed,
vent the internal pressure of the dryer to atmospheric pressure.
Restart the dryer according to the start-up instructions.
Disconnect power supply and depressurize dryer
before servicing. Dismantling or working on any component of
the compressed air system under pressure may cause equip-
ment failure and serious personal injury.

MAINTENANCE

The dryers require little maintenance for satisfactory opera-
tion. Good dryer performance can be expected if the following
routine maintenance steps are taken.
Dismantling or working on any component of the
compressed air system under pressure may cause equipment
failure and serious personal injury. Before dismantling any part
of the dryer or compressed air system, completely vent the
internal pressure to the atmosphere.
General
For continued good performance of your refrigerated dryer,
all refrigeration system maintenance should be performed by
a competent refrigeration mechanic.
NOTE: Before corrective maintenance is done during the war-
ranty period, call your local distributor and proceed according to
instructions. Refer to the warranty for limits of your coverage.
Daily Maintenance
Check the operation of the automatic drain valve at least once
daily. See the Field Service Guide for remedies to drain valve
malfunctions. See the Automatic Drain Valve section for drain
valve adjustment.
Monthly Maintenance
It is recommended to inspect the condenser coils monthly.
If necessary, remove dirt or other particles with compressed
air from an OSHA-approved air nozzle that limits its discharge
pressure to 30 psig (2.1 kgf / cm²).
Electronic Drain Valve Disassembly and Servicing
The valve body is attached to the valve strainer which is attached
to the heat exchanger vessel.
Do not disassemble drain valve timer or attempt
to repair electrical parts. Replace timer if defective.
The drain valve discharge condensate through a full-port drain
opening. The valve body may need to be cleaned under condi-
tions of gross particulate contamination.
To disassemble the drain valve body for cleaning and other
maintenance:
1. Turn power switch off.
2. Disconnect main power supply to dryer.
3. Depressurize unit.
4. Lock out and tag power supply in accordance with OSHA
requirements.
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