Maintenance And Troubleshooting - Bard D25A2PA Installation And Service Instructions Manual

MAINTENANCE AND TROUBLESHOOTING

STANDARD MAINTENANCE
PROCEDURES
WARNING
!
Electrical shock hazard.
Disconnect both VAC and VDC power supplies
before servicing.
Failure to do so could result in electric shock
or death.
CAUTION
!
Cut hazard.
Wear gloves to avoid contact with sharp
edges.
Failure to do so could result in personal
injury.
1. Disable system from LC controller (see controller
manual).
2. Turn off both AC and DC breakers at wall-mount
units.
3. Check inlet sides of condenser and evaporator coils
for obstructions/debris—clean if necessary using a
quality manufactured coil cleaning product specific
for the evaporator or condenser coil.
• Condenser coil: Remove the fan shroud/
motor/motor bracket as an assembly from the
condenser section. This will give clear access
to the inlet side of the coil for cleaning. Follow
the coil cleaner manufacturer's directions
for necessary safety gear and precautions, as
well as for application and use. More than
one application may be necessary. Rinse
thoroughly.
• Evaporator coil: Remove the evaporator
section panel and apply specific evaporator
cleaner directly to the inlet side of coil, being
very careful not to overspray into insulation
or surrounding panels and wiring. Residual
cleaner and dissolved debris should drip into
the drain pan and leave the unit through the
condensate hose. More than one application
may be necessary. Rinse thoroughly.
Manual 2100-643C
Page 38 of 59
4. Manually spin fan and blower motors to ensure
they turn freely. All motors are permanently
lubricated, so no oil is necessary.
5. Inspect free cooling damper actuator and linkage.
6. Install new air filter; check for additional filter
grilles internal to the structure.
7. Inspect the control panel of the system.
• Look for insect or rodent activity and remove
any nesting materials.
• Manually push contactor closed, observe for
movement—contactor points should have
minimal discoloration, no spalling or other
signs of arcing. Replace if doubtful.
• Check field and factory wiring for tightness and
look for signs of overheating (discoloration of
terminals or wire insulation).
8. Ensure that supply and return registers are not
obstructed, and more importantly, are not recycling
the air to one another. Adjust supply louvers if
necessary to direct discharge air away from any
direct route to the return grille.
9. Re-assemble wall-mount unit and turn breakers
back on.
10. Enable system from LC controller (see controller
manual).
11. Repeat steps for second wall-mount unit.