4
barometric damper can be used for your CMF
power oil furnace installation. The barometric
damper used must be installed such that air
from the conditioned space can only enter the
flue passageway. Do not use a double acting
barometric damper. All flue pipe joints should be
fastened with sheet metal screws for rigidity.
The chimney height, required draft, and number
of appliances served by the chimney must be
in accordance with all applicable codes. To
prevent down draft, the chimney should extend
at least two feet above the peak of the roof.
It is recommended that the furnace flue serve
no other appliances. When the chimney serves
only the furnace, the flue area must be sized
according to all applicable codes. The minimum
internal area of the flue must be equal to at least
the area of the furnace flue exit.
When two or more appliances must vent through
a common flue, the area of the common flue
should be sized in accordance with all applicable
codes.
When an existing furnace is removed or replaced
in a venting system, then the venting system
may not be properly sized to vent the attached
appliances. The venting system must be
checked to ensure proper venting. Improperly
sized venting systems can result in the formation
of condensate, leakage, spillage, et cetera.
Refer to the ANSI Z223.1/NFPA 54, (National
Fuel Gas Code), and ANSI/NFPA 31( Installation
of Oil Burning Equipment) for correcting any
improperly operating venting system.
The following steps shall be followed with each
appliance connected to the venting system
placed in operation, while any other appliances
connected to the venting system are not in
operation:
(a)
Seal any unused openings in the venting
system.
(b)
Inspect the venting system for proper size
and horizontal pitch, as required in the
ANSI Z223.1/NFPA 54, (National Fuel Gas
Code) and ANSI/NFPA 31 (Installation of
Oil
Burning Equipment), and these instruc-
tions. Determine
that there is no blockage or restriction,
leakage, corrosion
or other deficiencies which could cause an
unsafe condition.
(c)
In so far as is practical, close all building
doors and windows and all doors between
the space in which the appliance(s) con-
nected to the venting system are located
and other spaces of the building. Turn on
clothes dryers and any appliance not con-
nected to the venting system. Turn on any
exhaust fans, such as range hoods and
bathroom exhausts, so they shall operate
at maximum speed. Do not operate a
summer exhaust fan. Close fireplace
dampers.
(d)
Follow the lighting instructions. Place the
appliance being inspected in operation.
Adjust thermostat so appliance shall oper-
ate continuously.
(e)
Test for draft hood equipped appliance
spillage at the draft hood relief opening
after 5 minutes of main burner operation.
Use the flame of a match or candle.
(f)
After it has been determined that each
appliance connected to the venting sys-
tem properly vents when tested as out-
lined above, return doors, windows,
exhaust fans, fireplace dampers and any
other gas burning appliance to their previ-
ous conditions of use.
Flashing
Barrel
Ceiling Plate
Vent
Ventilation
Knock-Out
DUCT
CONNECTOR
Return Air
Grille and
Filter
Power Supply
Connection
Access
Door
Base Pan
Fuel Line
Feeder Duct
Combustion
Air Duct
FURNACE
ASSEMBLY
ROOF JACK
ASSEMBLY
Combustion Air
Adapter (Not Shown)
is to be Installed
Over Combustion
Air Duct
Figure 1. Typical Furnace Installation for
Manufactured Housing Applications
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