Air Conditioning Applications; Combustion Air - Coleman P*HBX12F08001 Installation Instructions Manual

AIR CONDITIONING APPLICATIONS

If the furnace is used in conjunction with air conditioning, the
furnace shall be installed in parallel with or upstream from the
evaporator coil to avoid condensation in the heat exchanger.
In a parallel installation, the dampers or air controlling means
must prevent chilled air from entering the furnace. If the damp-
ers are manually operated, there must be a means of control to
prevent the operation of either system unless the dampers are
in the full heat or full cool position.
The air heated by the furnace shall not pass through a refrig-
eration unit unless the unit is specifically approved for such
service.
The blower speed must be checked and adjusted to compen-
sate for the pressure drop caused by the evaporator coil. Refer
to Page 12 for recommended wiring and electrical connections
of the air conditioning controls.

COMBUSTION AIR

If the furnace is installed in a closet or utility room, two openings
must be provided connecting to a well ventilated space (full
basement, living room or other room opening thereto, but not a
bedroom or bathroom).
One opening shall be located above the level of the upper vent
opening and one opening below the combustion air inlet open-
ing in the front of the furnace. Each opening shall have a mini-
mum free area of 1 square inches per 1,000 Btu/h of total
input rating of all appliances installed in the room.
For furnaces located in buildings of unusually tight construc-
tion, such as those with high quality weather stripping, caulk-
ing, windows and doors, or storm sashed windows, or where
basement windows are well sealed, a permanent opening
communicating with a well ventilated attic or with the outdoors
shall be provided, using a duct if necessary.
The duct opening shall have a free area of 1
per 1,000 Btu/h of total input rating of all appliances to be in-
stalled. When a furnace is installed in a full basement, infiltra-
tion is normally adequate to provide air for combustion and
draft operation. Furnace rooms under 700 sq. ft. (65m
automatically be treated as confined space.
DOWNFLOW/HORIZONTAL FURNACES
Downflow/horizontal models (P*DHX12F08001 & P*-
DHX16F12001) are factory shipped for downflow installation.
Downflow
If the furnace is to be installed in a downflow application, a com-
bustible floor base must be used (either 1CB0312, or
1CB0316). Refer to Figure 1.
1 IN. 1 IN.
FRONT VIEW
FIGURE 1 - DOWNFLOW APPLICATION
COMBUSTIBLE FLOOR BASE
Unitary Products Group
square inches
3
) should
DOWNFLOW
FURNACE
SUB BASE
ASSEMBLY
COMBUSTIBLE
FLOOR
DUCT
CONNECTION
20-½ X 20-½
1 IN.
SIDE VIEW
END VIEW
FIGURE 2 - HORIZONTAL SUSPENDED APPLICATION
HANGER ARRANGEMENT
Horizontal
For applying the furnace in a horizontal left or horizontal right
application follow these steps.
1. Rotate the furnace 90 degrees to the desired position.
2. Remove three nuts and washers fastening the oil burner
assembly to the furnace. Rotate the oil burner assembly to
an upright position (ignition transformer and/or protector
relay control should be on top).
3. Realign the oil burner assembly to the combustion cham-
ber (fire pot) and then secure with three nuts and washers.
4. Remove the cover from the flue collar.
5. Remove the screws securing the flue collar to the furnace
and then rotate the flue collar 90 degrees, such that the
venting attaches to the top.
6. Secure the flue collar to the furnace, then reinstall the flue
collar cover.
7. Horizontal-right applications using model P*DHX12F080
also require relocating the limit control to the alternative lo-
cation near the top of the unit (refer to Figure 2).
For non-suspended horizontal applications, maintain clear-
ances as shown on Table 1. Installation on a combustible floor
requires a clearance of 1". This can be done by using non--
combustibles such as 1" channel iron or similar material. The
furnace must be supported in such a way to prevent twisting or
sagging of the cabinet.
For suspended horizontal applications maintain clearance as
shown in Table 3. Remove the four circular knockouts on the
top panel and the four knockouts on the bottom panel.
The removed knockouts allow 3/8" threaded rod to be inserted
through the interior of the furnace. Refer to Figure 2.
1 IN.
Use care when inserting rods since the foil backed insulation
can be easily ripped and torn. Secure the furnace with 2" mini-
mum slotted angle or equilavent. The furnace must be sup-
ported in such a way to prevent sagging or twisting of the
cabinet.
035-14289-000 Rev. A (0701)
2" MIN.
SIDE VIEW
THREADED ROD 3/8'
NUT
WASHER
FURNACE
SLOTTED ANGLE
WASHER
NUT
JAM NUT.
3