Unit installation
30 McQuay IM 777-3
Service and Maintenance
Removing the Fan Assembly
1
Remove the side panels and any intermediate supports
(follow instructions for side panel removal).
2 Once the panels and any intermediate supports are
removed, disconnect the neoprene bulk head seal that is
attached to the fan discharge.
3 Remove the four discharge angles that hold the neoprene
canvas in place around the discharge opening.
4 Disconnect the fan sled from each of the corner mounts and
pull the entire assembly out the side of the unit.
5 After the fan sled is out, loosen the fan bearings and pull
out the shaft.
6 Disconnect the fan housing from the fan sled, and bearing
support by removing the attaching bolts.
7 Replace the new fan, reconnect the shaft and bearings and
put the fan assembly in the cabinet.
8 Replace panels and fasteners.
Removing and Replacing the Coil
Removing Single Coils
Note:
Single coils are bolted to the unit on the connection end.
The connection end is held in place with a clamp.
See Figure 41.
1 Disconnect all piping and remove the brass plugs for the
vents and drains located in the connections.
2 Remove all screws and remove the access panel.
3 Remove the screws holding the coil in place.
4 Lift and pull the coil out the side.
Installing Single Coils
1
Slide the coil through the opening in the coil section onto
the bottom coil rests.
2 To prevent any air bypass around the coil, place coils up
against the coil bulkheads. See Figure 41.
3 Once the coil is in place, fasten the coil to the section.
4 Caulk the seams between the coil casings and bulkheads.
See Figure 41.
5
If this is an additional coil being installed and not a
replacement, locate the coil supply and return connections
dimensionally. Carefully drill holes in the end panels of the
unit.
6 Remove the brass plugs for the vents and drains on the
connections.
7 Slip the panel over the connections.
8 Replace the brass plugs and panel fasteners.
Figure 40: Single Coil Top Installation/Removal
Figure 41: Single Coil Side Installation/Removal
Coil
Connection
end
Coil
Opposite
connection
end
Coil
Connection end
Coil
Opposite connection end
Coil
Bulkhead
Coil
Rests