4
McQuay IM 777-4
Mechanical Installation
Mechanical Installation
Service Clearances
In addition to providing adequate space around the unit for
piping coils and drains, access to at least one side of the unit is
always required to allow for regular service and routine
maintenance, which includes filter replacement, drain pan
inspection and cleaning, fan bearing lubrication, and belt
adjustment. Provide sufficient space—at least equal to the
length of the coil—on the side of the unit for coil removal. See
Figure 1
for servicing space requirements.
Maintain at least 54" of clearance in front of electrical power
devices. Electrical power devices that are mounted on the side
of the unit typically are up to 12" deep (
Figure 2
).
Figure 1: Servicing Space Requirements
Figure 2: Service Clearance for Electrical Power Devices
Rigging
Skyline air handlers ship as separate sections, completely
assembled, or in modules of assembled sections.
The unit must
be rigged as it ships from the factory. Do not rig units after
assembly.
Units are provided with a factory-installed base rail
and can be lifted using the 2" diameter lifting holes located in
the corners of each shipping section. To prevent damage to the
unit cabinetry, use spreader bars. Position spreader bars to
prevent cables from rubbing the frame or panels. Before
hoisting into position, test lift for stability and balance. Avoid
twisting or uneven lifting of unit.
Figure 3: Unit and Section Rigging
Curb Mounting and Unit Leveling
Do not place a Skyline unit over an open curb unless it is
equipped with a curb-ready base. Installation instructions for
mounting units on a roof curb are provided in IM 770. For a
copy, contact your local McQuay representative or visit
www.mcquay.com. Make provisions under the unit to divert
any moisture from entering the building below.
For units without roof curb mounting, place the equipment on
a flat and level surface. Where surface irregularities exist, shim
the base of the unit at one or more points along the length of
the rails to prevent distortion or sagging of the support rails.
Uneven or distorted sections cause misfit or binding of the
doors and panels and improper draining of drain pans
(
Figure 4
).
4 . 0 0 " b a s e r a i l e x t e n s i o n
W i d t h
3 0 . 0 0 "
4 . 0 0 "
W i d t h o f c o i l s e c t i o n
W i d t h o f
f a n s e c t i o n
3 0 . 0
0 "
H e i g h t
5 4 "
1 2 "
