2
McQuay IM 672-3
Installation Guidelines
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 shaft removal
and coil removal. Space, at least equal to the length of the side
coil, is required for coil removal. Space, at least equal to the
fin height, is required for top coil removal
.
See Figure 1 for
servicing space requirements.
For routine maintenance purposes, access normally is
obtained through the access doors or by removing panels. Fan
and filter sections are always provided with a service door on
one side of the unit. If requested, doors can be provided on
both sides of the unit. Optional service doors are available for
most section types and are provided based on customer
request.
If component replacement is required, the top panel also can
be removed. If necessary, the unit can be disassembled.
Maintain at least 54" of clearance in front of electrical power
devices (starters, VFDs, disconnect switches and combination
devices). Electrical power devices that are mounted on the
side of the unit typically are up to 12" deep. See Figure 2.
Figure 1: Servicing space requirements
Figure 2: Service clearance for electrical power devices
Rigging
Vision 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.
When a unit is provided with a
factory-installed base rail, it can be lifted using the 2"
diameter lifting holes located in the corners of each shipping
section. If a unit does not have a base rail, rig it using straps or
a sling. Fasten the strapping under the skid that ships with the
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 the
unit.
Figure 3: Units on base rails
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 "