3
In the upflow position, the heat ex-
changer support screw shown in the
picture may be removed. This may be
preferable if the furnace rear panel will
be inaccessible after installation. The
screw must be removed if the heat ex-
changer must be removed from the cabi-
net. Do not remove this screw if installing
furnace in a horizontal position.
HORIZONTAL INSTALLATION
P3HMX
furnaces models are assembled
and shipped ready for installation in the
up-flow position. The furnace may be
installed in either of the horizontal posi-
tions; warm air discharging left or warm
air-discharging right by following these
steps:
Heat Exchanger Support Screw
1. Rotate the furnace 90° to the de-
sired position.
2. Remove the three nuts fastening the
oil burner assembly to the furnace.
Rotate the oil burner assembly to be
in the normal upright position.
3. Re-align the oil burner assembly to
the combustion chamber (fire-pot),
and then secure into place with the
three nuts.
NON-SUSPENDED INSTALLATION
Maintain clearances to combustibles as
outlined in Table 1. Installation on a
combustible floor requires a clearance of
1 inch. This can be done by using a non-
combustible material such as one-inch
thick channel iron or similar material. The
furnace must be supported in such a way
as to not allow twisting or sagging of the
cabinet. Suggestion; as a measure to
prevent fuel oil from accumulating in
locations other than the fire pot, as could
be the case in the event of nozzle drip,
install the furnace with an approximate 2
degree slope from the oil burner casing
towards the fire pot. Use shims made of
noncombustible material.
SUSPENDED INSTALLATION
Refer to Figure 1. Maintain clearances to
combustibles as outlined in Table 1. The
furnace may be suspended by field fabri-
cating a cradle of angle iron and
threaded rod. Secure the furnace with 2
inch minimum slotted angle or equiva-
Table 1: Clearance to Combustibles
Furnace
P3LBX P3HMX
Location Upflow
Upflow
Horizontal
Top
1 in.
2 in.
2 in.
Bottom
0 in.
0 in.
1 in.
S/A Plenum
1 in.
1 in.
1 in.
Rear 0
in.
1
1 in.
1 in.
Sides 1
in.
2
1 in.
1 in.
Front
3 in.
9 in.
1
9
in.
1
4 in.
3
Flue Pipe
8 in.
4
9 in.
9 in.
Enclosure Closet
Closet
Alcove
1
24 inches is required for servicing.
2
18 inches is required on one side as service access to rear.
3
4 inches measured horizontally or below flue pipe.
4
8 inches measured vertically or above flue pipe.
Fig. 1:
Typical Sus-
pended Application
Summary of Contents for P3HMX12F08001
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