30
McQuay IM 777-4
Service and Maintenance
Figure 42: Single Coil Top Installation/Removal
Figure 43: Single Coil Side Installation/Removal
Removing Stacked Coils
Note:
Top and bottom stacked coils are held together with steel
plate and screws on one side and drain trough and
screws on the other side. Remove the plate and trough
before removing the coils. The coils cannot be removed
attached together.
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 bolts holding the coil in place and then lift
and pull out the coil from the side.
4
Remove the steel plate and the drain trough that holds
the coils together.
5
Remove the bolts on both ends of the top coil holding it
in place and then lift and slide the coil out.
6
Remove the bolts on both ends of the bottom coil
holding it in place and then lift and slide the coil out.
Installing Stacked Coils
1
Slide the bottom coil through the opening in the coil
section onto the bottom coil rests.
2
Place the coil up against the coil bulkheads to prevent
any air bypass around the coil.
3
Once the coil is in place, bolt the coil to the section.
4
Caulk the mounting surface of the steel plate and install
the plate on the coils.
5
Caulk the mounting surface of the drain trough and
install the drain trough on the coils.
6
Caulk the seams between the coil casings and blockoffs
.
7
Connect all piping and install the brass plugs for the
vents and drains located in the connections.
8
Install the access panel.
Removing and Installing Staggered Coils
Staggered coils have two banks of coils positioned a few
inches apart in the direction of airflow. Both coils are secured
to the unit on the connection and opposite connection end of
the unit.
1
Disconnect all piping and remove the brass plugs for the
vents and drains located in the connections.
2
To access bolts holding the coils in place, remove the
panels on both the connection and opposite connection
end of the coil section.
3
Each coil is held in place with bolts located in the
corners of the coil side plates. Remove the bolts and then
lift and pull the coil out the side.
4
The bottom coil is fastened to the air block off plate.
Remove the screws attaching this plate to the coil.
5
Once the fasteners holding the coil in place are removed,
pull out the coil from either side of the unit.
6
Install the coils in reverse order of removal.
Coil
Connection
end
Coil
Opposite
connection
end
Coil
Connection end
Coil
Opposite connection end
Coil
Bulkhead
Coil
Rests
