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.
Heat Exchanger Support Screw
HORIZONTAL INSTALLATION
P*HMX 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:
1. Rotate the furnace 90° to the de-
sired position.
2. Remove the three nut and washer
sets fastening the oil burner assem-
bly 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 nut and washer sets.
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.
Table 1: Clearance to Combustibles
Furnace P3LBX
P*HMX
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 Suspended Application
Summary of Contents for P2HMX12F08001
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