Page 13
Flue Connections
IMPORTANT
When flue pipe is installed at less than minimum
clearance listed in tables 2 and 3, radiation shields
must be installed. See figure 15.
Use 24 gauge or heavier galvanized smoke pipe and fit-
tings to connect furnace to vent. Maintain rise of at least
one inch per foot. Connect flue pipe to chimney using the
least number of elbows and angles possible. Flue pipe or
vent connector must be inserted into but not beyond the
outside wall of the chimney flue. No reduction in diameter
of flue pipe is acceptable. It is best to have flue pipe as
short and direct as possible. Where two or more ap-
pliances vent into a common flue, the area of the com-
mon flue should be at least equal to the area of the largest
flue or vent connector, plus 50% of the area of any addi-
tional flues or vent connectors. Install barometric draft
control (provided) and flue pipe according to instructions
packed with control.
1− Install draft control, provided, and flue pipe according
to instructions packed with control.
2− Connect flue outlet to chimney using at least 24 gauge
vent pipe and fittings, the same size as the flue outlet.
3− Use the least number of elbows and angles possible.
Slope flue pipe toward chimney approximately 1/4" for
every foot of horizontal run. Flue pipe or vent connector
must be inserted into but not beyond the outside wall of
the chimney flue.
Where two or more appliances vent into a common flue the
area of the common flue should be at least equal to the area
of the largest flue or vent connector, plus 50% of the area of
any additional flues or vent connectors.
Inspect flue pipe annually. Clean soot or ash from flue pipe,
if necessary. If pipe is rusted, replace.
É
ÉÉ
É
ÉÉ
É
ÉÉ
É
ÉÉ
É
ÉÉ
É
ÉÉ
É
ÉÉ
É
É
É
É
É
É
É
É
É
É
É
É
É
É
É
É
7"
A
12"
(305 mm)
1" (25mm)
min
(178 mm)
A
Figure 15
COMBUSTIBLE
MATERIAL
Radiation Shield Installation
OHR23 UNIT
(TOP)
RADIATION
SHIELDS
RADIATION
SHIELDS
(SEE NOTE 1)
FLUE
PIPE
B
SEE
NOTE 3
SEE NOTE 2
UNIT
CABINET
NOTE 1 Radiation shields must be constructed of 24 gauge sheet
metal
minimum
.
NOTE 2 Radiation shields required when A is less than 9"
(229mm).
NOTE 3 Radiation shields should extend from the top of the unit to
the top of the flue pipe.
NON−
COMBUSTIBLE
SPACERS
OHR23 UNIT
(FRONT)
Oil Supply Lines Sizing
Ensure that the restrictions of the piping system, plus any lift
involved, do not exceed the capability of the oil pump.
Use the following guidelines when determining whether to use
a single−or two−stage oil pump.
