Manual 2100-579A
Page
33 of 41
LOUVERS AND GRILLES
In calculating free area for ventilation and combustion
air requirements, consideration shall be given to the
blocking effect of louvers, grilles, or screens protecting
openings. Screens used shall not be smaller than 1/4
inch (6.3 mm) mesh and shall be readily accessible for
cleaning. If the free area through a design of louver or
grille is known, it shall be used in calculating the size
opening required to provide the free area specified. If the
design and free area is not known, it may be assumed that
wood louvers will have 30-35 percent free area and metal
louvers and grilles will have 60-75 percent free area.
VENTING OPTIONS
This furnace is designed to be vented conventionally
into a vertical chimney or horizontally through a side
wall with an optional Field Controls side wall power
venting system.
Note that the FLF series furnaces have been designed to
allow for bringing the vent system through the cabinet
side for increased venting flexibility. To take advantage
of this feature, simply remove the desired knockout
from either side or top of unit and rotate flue box
accordingly by removing four (4) screws under cleanout
plate as shown in Figure 2. Make sure smoke pipe
gasket is in place before reinstalling flue box screws.
VERTICAL VENTING
If the unit is to be vertically vented make sure the flue
pipe from the furnace to the chimney is the same size
diameter as the flue outlet of the furnace which is 6".
The flue pipe must have no reductions in diameter,
be made of a corrosion-resistant material having an
upward pitch of 1/4" for every foot of horizontal
run, and be made of material capable of handling
temperatures up to 1800°F.
A barometric damper is supplied with the furnace
and must be installed in the flue pipe observing the
instructions packaged with the damper control. The
barometric damper opening must be located in the same
atmospheric pressure zone as the combustion air inlet
to the furnace. The furnace
must not
be vented into the
same chimney with any solid fuel burning appliance
such as a wood burner or pellet burner. Masonry
chimneys must be lined with a listed system or other
approved material that will resist corrosion, softening
or cracking from flue gas temperatures up to 1800°F.
See Standard for Installation of Oil Burning Equipment
NFPA31 latest edition and Standard for Chimneys
NFPA211 latest edition for additional information.
HORIZONTAL VENTING
This furnace is designed to be horizontally vented
through a side wall with an optional side wall power vent
The recommended side wall vent is the Field Controls
model number SWG-4HDS for 085 and 110 models, and
SWG-5S for 140 models only. This vent can be
purchased through your local distributor. Follow all
installation instructions packaged with the vented system.
PREVENTION OF CHIMNEY CONDENSING
Condensing will always occur on chimney walls whose
temperatures are below the dew point of the stack
gas. If the chimney wall temperature does not exceed
the dew point during the heating cycle, moisture may
accumulate in large enough quantities to cause problems.
A metal stack (especially plain steel or galvanized) will
rust. Condensate will erode and break up a tile lined
or masonry chimney and in severe conditions corrode
the heat exchanger. Condensate could also enter the
home through cracks or joints in the chimney causing
structural damage in a worse case situation.
To prevent condensation, the internal chimney wall
temperatures must always be kept above the dew point.
If the chimney is a masonry type, it must be fitted with
a flue liner, when the temperature loss is too great for
the furnace. If the chimney is metal, then an “all fuel”
chimney must be used, such as a Class “A” triple wall or
insulated metal chimney. A liner will act as an insulator
and reduce the stack gas temperature loss. Insulation may
be added around the liner for further temperature stability.
If the chimney is on the home’s exterior, or passes through
a sizable, unheated area of the structure, such as a high
attic ceiling, porch, etc., the chimney must be insulated
around the exterior. Too large of a chimney for the furnace
and other appliance connected to it can cause condensing.
See Appendix E of NFPA31 to properly size the chimney.
The chimney size can be reduced by adding a liner. Be
sure to use stainless steel liners, such as stainless types
430, 304, or in extreme conditions type 316.
THERMOSTAT
These furnaces are designed to be controlled with any
24V heating or heating/cooling thermostat. The
heat/cool thermostats must be designed for independent
heat/cool transformer circuits to assure that the 24V
transformer built into the oil primary control does
not conflict with the main furnace 24V transformer.
The heat anticipator should be set at 0.20A. This is
a nominal setting. The thermostat circuit should be
checked to verify setting.
3.667
4.500
3.250
2.000
2.000
8.500
DRAWN BY
SCALE
DISTRIBUTION
DWG.
CHECKED
APPROVED
NO.
NO.
DATE
PART
NAME
MAT'L
Bard Mfg. Co.
Bryan, Ohio
PART
1 2 3 4 5
INDOOR/OUTDOOR
MUST BE CSA APPROVED
BLACK
NAMEPLATE LISTING.
FOR ACCEPTABLE ADHESIVE
BRIGHT YELLOW
LIGHT BLUE
WHITE BACKGROUND
DIECUT SHEET
OUTDOOR VINYL, SUPPLIER
COLORS:
FORM:
MATERIAL:
PRINTING:
END USE:
7/27/2012
SD
BAR
7961-768
RR
1:1
REV.
DATE
DESCRIPTION
ECN NO DRN CHK APR
OIL LABEL SHEET
