Automatic Drain Valve (Adv) Disassembly And Servicing - Sigma HRD Serie Manual De Instrucciones

Automatic Drain Valve (ADV) Disassembly
and Servicing
Dryers rated 200 scfm and larger have a timer-
controlled automatic drain valve.
CAUTION
Do not disassemble the ADV timer or attempt
to repair electrical parts. Replace timer if
defective.
The ADVs discharge condensate through a full-port
drain opening. The valve body may need to be cleaned
under conditions of gross particulate contamination.
To disassemble the ADV valve body for cleaning or
other maintenance (refer to Figure 9):
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 hose that connects the ADV to the filter.
5. Remove screw and washer from front of ADV.
HRD and HRD-EM Series (Bulletin 378)
6. Remove the power supply connector and gasket
7. Remove 13 mm nut and spring washer from top of
8. Lift solenoid coil housing off solenoid core in
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.
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
Figure 9
AUTOMATIC DRAIN VALVE COMPONENTS
(with the timer assembly, if attached) from the so-
lenoid coil housing. Do not damage or lose the
gasket.
solenoid coil housing.
valve body.
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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