Product manual

46 McQuay IM 782-4
Service and Maintenance
Coil Maintenance
1 For maximum performance, the coil must be clean.
Check once a year under normal operating conditions
and brush or vacuum clean if necessary. Use a chemical
coil cleaner on multiple row coils. Read and follow the
chemical cleaner’s instructions since some cleaners may
contain harsh chemicals. Take care not to damage fins
while cleaning.
2 Drain pans in any air conditioning unit may have some
moisture. Algae and other organisms can grow due to
airborne spores and bacteria. Clean periodically to
prevent build-up from plugging the drain and causing the
drain pan to overflow. Keep drain pans clean to prevent
the spread of disease. Cleaning should be performed by
qualified personnel.
3 Dirt and lint can clog the condensate drain, especially
with dirty filters. Inspect twice a year to help avoid
overflow.
Component Removal and Replacement
Panel Removal
Remove the screws located along the sides of the panel. Pull
the panel out using the pocket pull handles. If the panel does
not have a pull handle, remove the adjacent panel with a
pocket pull or door and pop out the panel from the inside.
Fan Section Removal
The fan shaft, motor, and any drive components are removable
through the access door or panel opening.
If fan replacement is required, the entire fan assembly can be
pulled out the side of the cabinet. The fan assembly includes
the fan housing, the bearing support, and the fan base.
1 To remove the fan assembly, remove the side panels
(follow instructions for side panel removal).
2 Disconnect the neoprene bulkhead seal that is attached to
the fan discharge. Then disconnect the fan sled from
each of the corner mounts and pull the entire assembly
out the side of the unit.
3 Loosen the fan bearings and pull out the shaft.
Disconnect the fan housing from the fan sled and bearing
support by removing the attaching bolts.
4 Replace the new fan, reconnect the shaft and bearings
and put the fan assembly in the cabinet. Replace panels
and fasteners.
Coil Removal and Replacement
Before removing the coil, disconnect all piping.
1 Remove exterior panels from both sides of the coil
section. Remove screws that secure the top of the leaving
coil face to the upper track on the inside top of the unit.
2 Lift drain pan condensate connection above the unit
frame flange and slide drain pan, coil(s), and baffles out
of unit.
3 Slide the coil, blockoffs, and drain pan assembly back
into unit the same way it was removed. Check the
installation for an airtight fit.
4 Reinstall screws that secure the top of the leaving coil
face to the upper track on the inside top of the unit.
Figure 44: Coil Removal
CAUTION
SHARP EDGES AND COIL SURFACES are a potential injury
hazard. Avoid contact with them.
ATTENTION
Les bords tranchants et les surfaces des bobines sont un
risque de blessure. Ne les touchez pas.
WARNING
Clean drain pan regularly so mold does not develop.
AVERTISSEMENT
Pour eviter la moisissure Nettoyer regulierement le bassin de
recuperage.
Remove screws
from the upper track
that hold coil/drain pan
in place.
Lift drain pan connection
up and slide coil/drain pan
assembly out.
2
1
Airflow