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Table 1: Clearance to
Combustibles
Furnace
P*LBX
Location
Upflow
Top
3 in.
Bottom
0 in.
S/A
0 in.
Plenum
Rear
1 in.
Sides
6 in.
Front
24 in.
Flue Pipe
9 in.
Enclosure
Standard
1
24" Required for Service
2
18" Required on one Side for
access to rear
3
18" in USA
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
noncombustible material such as one
inch
thick
channel
iron
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
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
Maintain clearances to combustibles as
outlined in Table 1. The furnace may be
suspended by field fabricating a cradle of
angle iron and threaded rod. Secure the
furnace with 2 inch minimum slotted
angle or equivalent. The furnace must be
supported in such a way as to not allow
twisting or sagging of the cabinet.
Position the supports so as to not
interfere with accessing the burner and
blower compartments. Suggestion; as a
measure
to
prevent
fuel
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.
3
AIR CONDITIONING
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 dampers are
manually operated, there must be a
means of control to prevent the operation
1
of either system unless the dampers are
2
in the full heat or full cool position. The
air heated by the furnace shall not pass
through a refrigeration unit unless the
3
unit is specifically approved for such
service.
Generally, a six-inch clearance between
the air conditioning evaporator coil and
the heat exchanger will provide adequate
airflow through the evaporator coil.
The blower speed must be checked and
adjusted to compensate for the pressure
drop caused by the evaporator coil.
Refer to Appendix B for recommended
wiring and electrical connections of the
air conditioning controls.
COMBUSTION AIR
When a furnace is installed in the full
or
similar
basement of a typical frame or brick
house, infiltration is normally adequate to
provide air for combustion and draft
oil
from
operation. If the furnace is installed in a
closet or utility room, two (2) ventilation
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 6" from the
top and bottom of the enclosure at the
front of the furnace. For furnaces located
in
buildings
construction, such as those with high
quality
weather
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. Size
all of the openings and associated
ductwork by the standards provided in
the latest Oil Installation Code editions;
oil
from
NFPA 31 in the United States, CAN/CSA
B139 in Canada. Take all fuel burning
appliances in the area into consideration
when
calculating
ventilation air requirements.
of
unusually
tight
stripping,
caulking,
combustion
and
CHIMNEY VENTING
The chimney must be sized correctly and
be in good repair. If the chimney is
oversized, there is a high risk of the flue
gases condensing resulting in damage to
the chimney and other venting parts.
This problem may be corrected by the
use of an appropriately sized chimney
liner.
If
the
chimney
P*LBX16F14501 furnace only, the vent
should be sized at 4-inch minimum, 6-
inch maximum. If the chimney serves the
P*LBX20F19001 furnace only, the vent
should be sized at 5-inch minimum, 7-
inch maximum. The data provided in
Table 3 is based on dedicated venting. If
the furnace is to be co-vented with other
appliances, refer to NFPA 211, Standard
for Chimneys, Fireplaces, Vents, and
Solid Fuel-Burning Appliances, NFPA
31, Standard for the Installation of Oil
Burning Equipment or CAN/CSA B139,
Installation
Code
For
Equipment for correct sizing information.
NOTE: This furnace is approved for
use with L-Vent.
NOTE: Maximum temperature for L-
Vent is 575°F (300°C).
IMPORTANT: The chimney must be
capable of providing sufficient draft at all
times for the safe removal of the
products of combustion.
The chimney should be tested under
"winter" conditions; doors and windows
closed, all other fossil fuel burning
appliances
on,
clothes
bathroom fans on, etc. If the chimney
cannot overcome the competition for air,
it will be necessary to access the reason
for it, and take corrective action. If the
chimney is found to be sized correctly
and in good repair, it will probably be
necessary to re-evaluate the availability
of combustion and ventilation air, and
take corrective action.
serves
the
Oil
Burning
dryer
on,
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