Product manual

McQuay IM 782-4 15
Installation Guidelines
Drain Pan Traps
Destiny air handlers have a drain pan connection on both sides
of the unit. Drain connections can be made on either side or
both sides. Drain lines and traps should run full size from the
drain pan connection. Drain pans should have traps to allow
condensate from coils to drain freely. The trap depth and
distance between the trap outlet and the drain pan outlet should
be twice the static pressure in the drain pan section under
normal operation for the trap to remain sealed. See Figure 15.
A secondary drain connection on the drain pan is standard on
all Destiny units. Secondary drain connections are required in
some applications as a visual means of identifying clogged
primary drain lines.
Figure 19: Allow Adequate Distance Between Trap Outlet
and Drain Outlet
Note: The door panels on some applications have a close
clearance over the drain pipes. Extend the drain fitting
with a coupling if necessary for door clearance.
Internal Isolation Assembly
Adjustment
Units have internally isolated fan and motor assemblies that
are secured with brackets for shipment.
Before Operating the Unit
Remove the shipping bracket and bolts and discard. The
shipping brackets located on the opposite drive side of the unit
are difficult to access from the drive side of the unit. Either
remove them before the unit is assembled, or remove the panel
on the opposite drive side to gain access.
Figure 20: Removing the Shipping Bracket, Sizes 002–010
Spring Mount Adjustments—Twin Fan Units
The spring isolators under the four corners of the fan and
motor assembly have been factory adjusted while the fan was
not running. See Table 1. With the unit operating at normal
cfm and static pressure, the isolators should all be at the same
height opening. If adjustments are required, loosen the 5/16"
capscrew on top of the isolator and turn the adjusting bolt to
lower or raise the fan and motor base. Retighten the capscrew
when adjustments are completed. See Figure 17 below.
When seismic snubbers and/or thrust restraints are provided,
no additional adjustments are required.
Figure 21: Spring Mount Adjustments—Twin Fan Units
Pressure (P)
at the drain pan
2P
2P
Table 1: Spring Mount Adjustment—Twin Fan Units
Spring mount adjustment at rest, unit sizes 015 to 030
ONLY
Fan
discharge
position
Top or bottom
horizontal H
Downblast
H
Upblast
H
1 3.75 3.75 4.25
2 4.25 3.75 4.25
3 4.25 3.75 4.25
4 3.75 3.75 4.25
Motor
Fan
POS 1
POS 2
POS 3
POS 4
Airflow
Fan isolator position numbers
Dim "H"
Spring height
adjustment screw