installation manual

05/15/2009 4 EI709
Mechanical Installation – Upflow
For downflow or horizontal see appropriate section. This upflow section provides more illustrations and
details. The installer should review this section and then relate the comments under downflow or
horizontal as they apply.
This section assumes there is either an A/C or HP A-coil, if there is no coil in the plenum simply proceed
without visualizing the presence of the A-coil. Typically this means the WarmFlo Select unit will be
directly above the furnace cabinet. However, if there is vertical space in the plenum (especially oil
furnace), insert the WarmFlo Select approximately 2/3 up.
N or W coils – for close coupling to the refrigerant coil, only A-coil is approved. If using an N or W-
coil, must allow at least 12” space between the refrigerant coil and the bottom of this WarmFlo Select
unit.
The WarmFlo Select is designed with a special double plate at the element mounting. Cool air from the
blower must enter between these two plates. Therefore, the WarmFlo Select must be inserted into the
plenum such that the mounting plate is even with the edge of the furnace hot air outlet hole. Do not
necessarily line up the WarmFlo Select control box with the furnace cabinet front. The concern is the
cutout in the plenum mating with WarmFlo Select element plate.
Using this sketch and visualizing the WarmFlo Select installation, work through the following eight steps:
Step 1
Observe and select insert location, furnace plenum
a. Above A-coil
b. Hole cutout must be at A-coil end
 2 sides of plenum choice, not 4
c. Hole cut plenum end, 8” free space above A-coil top
d. 10” minimum, between control box and plenum top
e. All distribution ducts above A-coil top