Adams Condensing Oil-Fired Furnace - Manual (Page 11)

STANDARD FURNACE CONNECTIONS
It is the responsibility of the installer to
ensure that the piping connections to the
furnace are secure, airtight, and adequately
supported.
All furnaces are shipped with a combustion
air connection on the cabinet exterior and a
flue connector on the inside of the cabinet
on the condensate collector box.
VENT/FLUE PIPE
Vent/flue pipe can be secured to the
vent^ue coupling using the rubber coupling
and worm gear hose clamps provided with
this furnace (see “Standard connections"
figure). The rubber coupling allows
separation of the vent/flue pipe from the
furnace during servicing.
Combustion Air and Vent piping should be
routed in a manner to avoid contact with
refrigerant lines, metering devices,
condensate drain lines, etc. If necessary,
clearances may be increased by utilizing two
45 degree Long-Sweep Elbows and creating
an “S” joint to provide additional space at
connection locations. This joint can be
rotated on the fitting to establish maximum
clearance between refrigerant lines,
metering devices, and condensate drain
lines, etc. This joint is the equivalent of one
90 degree elbow when considering elbow
count.
NOTE: Do not use other commercially
available “no hub connectors" due to
possible material conflicts. Theventfflue
pipe can also be secured usirrg a PVC or
ABS elbow or coupling using the appropriate
glue (see Section VI, Materials and Joining
Methods).
\^NT/FLUE AND COMBUSTION AIR PIPE
LENGTHS
Refer to the following table for applicable
length, elbows, and pipe diameter for
construction of the vent/flue and combustion
air intake pipe systems of a direct vent (dual
pipe) installation. The number of elbows
tabulated represents the number of elbows
and/or tees in each (Vent/Flue &
Combustion Air Intake) pipe. Elbows and/or
tees used in the terminations must be
included when determining the number of
elbows in the piping systems.
If the combustion air intake pipe is to be
installed above a finished ceiling or other
area wrfiere dripping of condensate will be
objectionable, insulation of the combustion
air pipe may be required. Use W thick
closed cell foam insulation such as Armaflex
or Insultube where required.
Non-Direct or Direct Vent (Dual Pipe)
Three (3) inch Pipe Diameter
Maximum Allowable Length of Vent/Flue and
Combustion Air Intake Pipe (ft)
Unit
input
BTU
Vent/fiue/Air
Intake Pipe
Termination
Maximum Allowable Length of
Vent/Flue Pipe (ft.)
Number of Elbowe
2 3 4 5 6 7 8
50.000
75.000
100.000
125.000
Standard 68 65 62 59 56 53 50
50.000
75.000
100.000
125,000
Alternate 55 52 49 46 43 40 37
Notes:
1 .
2
.
3.
4.
Minimum requirement for each vent
pipe is five (5) feet in length and one
elbow/tee.
Tee used in the vent/flue tennination
must be included when determining
the number of elbows in the piping
system,
3" diameter
Increased Clearance Configurations
using (2) 45 degree Long Sweep
elbows should be considered
equivalent to one 90 degree elbow.
Vent/Fiue atKl combustion Air Pit>e
Terminations
The vent/flue and combustion air pipes
may terminate vertically, as through a
roof, or horizontally, as through an
outside wail. Vertical pipe terminations
should be as shown in the following
figure. Refer to Section VI Vent/Flue
Pipe and Combustion Pipe Termination
Locations for details concerning location
restricfions. The penetrations through
the roof must be sealed tight with proper
flashing such as is used with a plastic
plumbing vent.
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