Gardner Denver RDS Series Operation And Maintenance page 18

RDS Series —50-1000 SCFM
Maintenance and Repair
DO NOT REMOVE, REPAIR, OR REPLACE ANY ITEM ON
THE DRYER WHILE THE DRYER IS UNDER PRESSURE.
BEFORE BEGINNING ANY REPAIRS, MAINTENANCE,
OR INSTALLATION WORK, ENSURE THAT THE POWER
IS OFF AND THE DRYER IS AT ATMOSPHERIC
PRESSURE.
BEFORE WORKING ON THE DRYER OR RELATED
EQUIPMENT, ENSURE THAT ALL PERSONNEL HAVE
READ AND UNDERSTAND THE SAFETY AND
OPERATION INSTRUCTIONS IN THIS MANUAL.
EVACUATE AND CHARGING TO BE DONE ONLY BY
A CERTIFIED EPA TECHNICIAN !
Preventive Maintenance Schedule
This is a suggested schedule based on average dryer
conditions. As conditions such as dirty environment,
humidity conditions, ambient temperature, etc. change,
the frequency and duration of the inspections may change.
DAILY
1. Inspect the dryer for proper operation.
2. Check the control panel for alarms.
3. Verify proper inlet and ambient air conditions.
WEEKLY
1. Test the drain by depressing the drain
switch on the main control panel.
2. Inspect and log pressure differential readings
across filters. Inspect filters if they are out of
range. Change as necessary.
MONTHLY
1. Blow entire unit out with compressed air.
2. Blow condenser coils out with compressed air.
3. Inspect refrigeration compressor for overheating.
4. Clean air filter on the condenser.
NOTE : Filters that are running in dirtier than normal
environments will need to be inspected and changed
more often.
SEMI-ANNUALLY
1. Inspect entire assembly for loose connections,
screws, panels etc.
2. Inspect refrigeration circuit for signs of oil and
refrigerant leakage.
3. Clean fan blades, casing, motors and internal
components. Use light mixture of detergent. No
oil based cleaning solvents should be used for
cleaning the unit.
Annually
1. Tighten all electrical connections. Look for broken,
cracked, or bare wires.
2. Measure and record amperage. Verify that readings
are within acceptable parameters as listed in
specification table.
3. Clean the condenser coil with a mild detergent
mixture and brush.
Drain Cleaning Instructions
1. Remove top panel from dryer.
2. Slide control panel out of the grooves in the extruded
aluminum rails. Set the panel on top of the dryer.
3. Slide the front panel out of the grooves in the
extruded aluminum rails. Set the panel aside.
4. Locate the drain solenoid valve on the lower right-
hand side of the heat exchanger assembly. Remove
the retainer screw on the top of the solenoid coil.
5. Lift the coil off of the valve and set it to the side.
6. Locate and remove the two (2) screws that hold the
valve core in place. The screws are located on either
side of the solenoid stem in the brass retainer plate.
NOTE: some of the fiberglass insulation on the heat
exchanger may need to be cleared away to gain
access to the screws.
7. Carefully remove the core from the valve assembly.
CAUTION: This assembly contains a plunger, seat,
and a small spring. Be careful to not lose any of the
small parts during di-assembly.
8. Inspect the valve seat for signs of wear. Inspect the
orifice of the valve for signs of dirt, oil, or other
contaminants. If any contaminants exist, remove
them with needle nosed pliers or a cotton swab
soaked with alcohol. Be careful not to push any
contaminants back into the valve.
9. When the valve is clean, reassemble in reverse
order.
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Section 6