McQuay FCVC, Installation And Maintenance Manual

Page: 18 / 82

18 McQuay IM 980-1
Operation and Maintenance
Key-lock Access Door Kit
The key-lock access door kit (see Figure 26 ) can be installed
on ThinLine 3G cabinet units to prevent access to unit
controls. For detailed installation information, refer to
page 4 3.
Figure 26: Key-Lock Access Door Kit
General Maintenance
Normal maintenance on all units is generally limited to filter
changes and cleaning the condensate drain pans. Units are
provided with permanently lubricated motors and require no
oiling even though oil caps may be provided.
Record performance measurements of volts, amps, and water
temperature differences (both heating and cooling). A
comparison of logged data with start-up and other annual data
is useful as an indicator of general equipment condition.
Filter Changes
Filter changes are required at regular intervals. The time
period between changes will depend upon the project
requirements. Some applications, such as motels, produce a lot
of lint from carpeting and linen changes, and will require more
frequent filter changes. Check filters at 60-day intervals for the
first year until experience is acquired. If light cannot be seen
through the filter when held up to sunlight or a bright light, it
should be changed. A more critical standard may be desirable.
Filters can be removed without removing any panels. See
Figure 27 . However, if the unit is equipped with a return air
grille, this must first be removed to access the filter. To remove
the filter:
1
Slide your hands under the front opening on the bottom
of the unit and feel for the filter above.
2
Slide your fingers along the bottom of the filter until they
reach the rear paperboard edge.
3
Push the paperboard edge backward about a half-inch
until the front edge of the filter drops down.
4 Remove the filter from under the unit.
To install a new filter:
1 Slide the filter under the unit and tilt its rear 0edge
upward and into the pocket at the rear of the filter
housing.
2 Push the front edge of the filter backward until it clears
the front lip on the filter housing, then push it up and into
place.
Figure 27: Filter Removal
Condensate Drain Pans
The main and secondary condensate drain pans should be
checked annually and cleaned and flushed as required. See
Figure 28 .
Figure 28: Drain Pan Locations
Accessing the secondary drain pan
To access the secondary drain pan, remove the corner panel
from the side of the unit where the main piping connections
are made (this is opposite the side where the control access
panel is located on units with unit-mounted controls. See
Figure 5, page 6 for a description of how to remove it.
Push filter
backward
and tilt
down front
edge to
remove
Main Drain Pan
Secondary
Drain Pan
Remove screws and
slide forward to access pan