Ambient Air Filter Replacement; Automatic Drain Valve Disassembly And Servicing; Prefilter Element Replacement - Ingersoll Rand DXR Serie Manual De Instrucciones

Ambient Air Filter Replacement

For units equipped with the optional ambient air filter
(designated by the suffix F in the model number), in-
spect the filter element. If necessary, replace the ele-
ment by lifting it out and slipping in a replacement. See
the replacement parts lists for replacement element
model numbers.
Automatic Drain Valve Disassembly and
Servicing
All DXR Series dryers have a timer-controlled auto-
matic drain valve.The valve body is mounted on the
frame bottom; a hose connects the valve body to the
separator.
CAUTION
Do not disassemble drain valve timer or
attempt to repair electrical parts. Replace
timer if defective.
The drain valves 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 or other maintenance
(see Figure 6):
1. Turn power switch off.
2. Disconnect main power supply to dryer.
3. Lock out and tag power supply in accordance with
OSHA requirements.
WARNING
If power supply is not disconnected before
disassembly, serious personal injury and
valve damage may result.
4. Remove hoses that connect the drain valve to the
separator.
5. Remove screw and washer from front of the drain
valve.
6. Remove the power supply connector and gasket
(with timer assembly if attached) from the solenoid
coil housing. Do not damage or lose the gasket.
7. Remove 13mm nut and spring washer from top of
solenoid coil housing.
8. Lift solenoid coil housing off solenoid core in valve
body.
9. Unscrew solenoid core from valve body.
1-10
Once the drain valve is disassembled, the following
maintenance can be performed.
1. Inspect diaphragm; clean or replace as required.
2. Remove debris from valve body.
3. Wipe solenoid core components with a clean cloth
or blow out debris with compressed air from an
OSHA-approved air nozzle that limits its discharge
pressure to 30 psig.
4. Check that small port in diaphragm assembly is
clear and solenoid coil moves freely in housing. Vi-
ton diaphragm seals are compatible with commonly
used synthetic lubricants.
5. If timer is attached to valve body, check electrical
continuity across timer assembly.
To reassemble the drain valve, reverse the sequence of
the preceding steps. After the drain valve is reassem-
bled, connect the main power supply to the dryer. When
the dryer is returned to service, check the drain valve for
air or condensate leaks; tighten connections as required
to correct leaks. Check the drain cycle; adjust the timer
according to the procedure in the Automatic Drain
Valve Adjustment section.

Prefilter Element Replacement

On models equipped with the cold coalescing option (C
option), the filter element must be replaced at least once
a year or when the differential pressure gauge on top of
the filter is in the red zone.
To replacing the coalescing prefilter element:
DANGER
Vent internal pressure to atmospheric
pressure before performing any maintenance.
1. Vent the internal pressure to the atmosphere. Refer
to the shutdown instructions on page 8.
2. Disconnect drain lines at manual and automatic
drain valves (if installed).
DANGER
A "hissing" sound while the bowl is being
removed indicates the filter has not been
properly depressurized. DO NOT continue to
remove the bowl until the filter has been
completely vented to atmospheric pressure.
CAUTION
Filter bowls may be heavy. Caution should be
taken when removing the bowl.
DXR Series Dryers (Bulletin 553)