Product manual

10 McQuay IM 782-4
Installation Guidelines
Reversing the Coil Handing
Coil connections can be switched to the opposite side of the
unit by rotating the coil(s) 180 degrees side to side and
reworking the coil section panel on the opposite side of the air
handler.
Note: Direct expansion (DX) coils require 180 degree rotation
on the top to bottom to locate distributor tubes at the
leaving face of the coil.
To reverse the coil connections, follow the steps below,
referring to Figure 7 on page 10.
1 Remove exterior panels from both sides of the coil
section. Remove screws that secure the top of the leaving
coil face to the upper track on the inside top of the unit.
2 Lift drain pan condensate connection above the unit
frame flange and slide drain pan, coil(s) and baffles out
of unit.
3 Remove screws and remove coil blockoffs.
4 Remove screws holding coil to drain pan and remove
coil.
5 Rotate the coil 180° and reposition coil blockoffs to the
entering air side of the coil.
6 Drill holes if required and fasten the blockoffs to the
entering side of the coil.
7 If unit has both heating and cooling coils, position and
bolt heating coil and cooling coil casings together in
same arrangement in the direction of airflow as unit was
shipped from factory. Reheat coils must remain in reheat
position; do not place in preheat position. Fasten the first
coil in the air stream to the entering side of the drain pan
using the same holes provided for the coil before it was
rotated.
8 Mark locations and drill holes to align with holes in
upper track.
9 Slide the coil, blockoffs and drain pan assembly back
into unit the same way it was removed. Check the
installation for an airtight fit. Re-install screws that
secure the top of the leaving coil face to the upper track
on the inside top of the unit.
Depending on whether the air handler was purchased from
stock or if it was manufactured for the specific job, the panel
on the opposite side may or may not have predrilled
connection holes.
1 If connection holes need to be drilled, determine the
proper diameter in order to use the existing grommets.
2 Mark connection locations on panel and drill new holes
to accommodate connections and grommets.
3 Plug and seal unused connection holes on opposite side
panel with new solid grommet or other suitable material.
CAUTION
Sharp edges and coil surfaces can cause personal injury.
Avoid contact with them.
ATTENTION
Les bords tranchants et les surfaces des bobines sont un
risque de blessure. Ne les touchez pas.