High-Humidity Alarm Field Adjustment - Ingersoll Rand HRD Serie Manuel De Instrucciones

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 hose that connects the ADV to the filter.
5. Remove screw and washer from front of ADV.
6. Remove the power supply connector and gasket
(with the timer assembly, if attached) from the so-
lenoid coil housing. Do not damage or lose the
gasket.
7. Remove 13 mm 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.
Once the ADV is disassembled, the following mainte-
nance can be performed:
1. Inspect diaphragm; clean or replace as required.
2. Remove debris from the valve body.
HRD Series (Bulletin 348)
Figure 7
AUTOMATIC DRAIN VALVE COMPONENTS
3. Wipe solenoid core components with a clean cloth
4. Check that small port in diaphragm assembly is
5. If timer is attached to valve body, check electrical
To reassemble the ADV, reverse the sequence of the
preceding steps. After the ADV is reassembled, con-
nect the main power supply to the dryer. When the
dryer is returned to service, check the ADV 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 ADV Adjustment
section.

High-Humidity Alarm Field Adjustment

The high-humidity alarm is an optional feature on
HRD Series heatless dryers; it is indicated by the suf-
fix H in the model number on the dryer nameplate.
Consult factory for instructions on setting the high-hu-
midity alarm for NEMA 7 dryers.
To set the high-humidity alarm:
1. Turn power switch OFF.
or blow out debris with compressed air from and
OSHA-approved air nozzle that limits the dis-
charge pressure to 30 psig.
clear and solenoid coil moves freely in housing.
Viton diaphragm seals are compatible with com-
monly used synthetic lubricants.
continuity across timer assembly.
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