Maintenance; Standard Maintenance Procedures - Bard MEGA-TEC W090A Service Instructions Manual

MAINTENANCE

Standard Maintenance Procedures

WARNING
!
Electrical shock hazard.
Disconnect all 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 LC6000 controller (see latest
revision of LC6000 Service Instructions 2100-
669).
2. Turn off AC 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: For inlet-side cleaning, remove
condenser grilles. For outlet-side cleaning,
remove condenser fan panel. Unbolt fan from
mounting brackets and slide fan outward until
lower locking arm drops into position. Pivot fan
by lifting fan locking arm. IMPORTANT: Be sure
to slide fan completely outward before pivoting.
Failure to do so could result in damage to the
coil. 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.
Manual 2100-671C
Page 42 of 59
• Evaporator coil: Open filter access panels
and remove filters. Apply specific evaporator
cleaner directly to the inlet side of coil, being
very careful not to overspray into insulation or
surrounding panels and wiring. For outlet-side
cleaning, remove supply grille and clean from
that direction. 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.
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 filters.
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, remembering to
fasten fan to mounting brackets. Turn breakers back
on.
10. Enable system to LC6000 controller (see latest
revision of LC6000 Service Instructions 2100-
669).
11. Repeat steps for additional wall-mount units.