035-17438-001 Rev. A (901)
8
Unitary Products Group
DUCTWORK
The duct system's design and installation must:
1.
Handle an air volume appropriate for the served space
and within the operating parameters of the furnace spec-
ifications.
2.
Be installed in accordance with standards of NFPA
(National Fire Protection Association) as outlined in
NFPA pamphlets 90A and 90B (latest editions).
3.
Create a closed duct system. The supply system must
be connected to the furnace outlet and the return duct
system must be connected to the furnace inlet. Both sup-
ply and return duct systems must terminate outside the
space containing the furnace.
4.
Generally complete a path for heated or cooled air to cir-
culate through the air conditioning and heating equip-
ment and to and from the conditioned space.
When the furnace is used in conjunction with a cooling coil,
the furnace must be installed parallel with, or in the supply air
side of the furnace.
When a parallel flow arrangement is used, the dampers or
other means used to control air flow must be adequate to pre-
vent chilled air from entering the furnace, and if manually
operated, must be equipped with means to prevent operating
of either unit unless the damper is in the full heat or cool posi-
tion.
UPFLOW
Supply Plenum Connection
Attach the supply plenum to the fur-
nace outlet duct connection flanges.
This is typically through the use of S
cleat material when a metal plenum is
used. The use of an approved flexible
duct connector is recommended on all
installations. This connection should be
sealed to prevent air leakage.
If a matching cooling coil is used, it
may be placed directly on the furnace
outlet and sealed to prevent leakage.
Follow the coil instructions for installing
the supply plenum.
On all installations without a coil, a removable access panel
is recommended in the outlet duct such that smoke or
reflected light would be observable inside the casing to indi-
cate the presence of leaks in the heat exchanger. This
access cover shall be attached in such a manner as to pre-
vent leaks.
Return Duct Connection
Return air may enter the furnace through the side(s) or bot-
tom depending on the type of application.
Return air may
not be connected into the rear panel of the unit.
See the
specific type application installation for details. Be sure to see
the Filters section of this instruction.
FILTERS INSTALLATION
All applications require the use of a filter. A high velocity filter
and retainer are provided for field installation.
Internal Installation
1.
Select desired filter position (left/right side, or bottom).
Remove the corresponding cabinet cutouts per instruc-
tions provided. Refer to Figure 4 on page 9.
2.
Install snap-in retainer clips into the corresponding slots
from the outside rear of the cabinet, refer to Figure 2 on
page 8. To prevent cabinet air leaks, install snap-in plugs
(provided) into the unused slots at the outside rear of the
cabinet.
3.
Install the wire retainer inside the cabinet. Insert the
open ends of the wire retainer into the clip loops at the
rear of the blower compartment. The retainer wire should
pivot freely like a hinge, on the clips at the rear of the
cabinet. Refer to Figure 3 on page 9.
4.
Install the filter(s) provided. Cut filter if necessary to
match air opening in cabinet. Filter should extend
beyond opening edge as much as possible to prevent air
from bypassing the filter. DO NOT remove stiffening rods
from inside the filter. Shorten the rods, if necessary, to
match final filter size.
The cooling coil must be installed in the supply air
duct downstream of the furnace.
FIGURE 2 :
Furnace Filter Slot Locations
FURNACE
(REAR CABINET)
RIGHT
SIDE
SLOTS
LEFT
SIDE
SLOTS
BOTTOM SLOTS
CABINET
SLOT
FILTER SUPPORT
CLIPS (PROVIDED)
PLUG UNUSED
CABINET SLOTS
WITH PLUGS
(PROVIDED)
