Coleman PxXU-V series Installation Instructions Manual page 21

035-17468-001 Rev. A (801)
6. All joints must be made to provide a permanent, air tight.
water tight seal.
7. Support the vent piping such that it is angled 1/4" per lin-
ear foot so that condensate will flow back towards the
furnace. Piping should be supported with pipe hangers to
prevent sagging. Maximum spacing between hangers is
5 feet, except SDR-PVC piping, where maximum spac-
ing is 3 feet.
8. Seal around the openings where the vent piping passes
through the roof or side wall.
Vent piping must be insulated with 1/2" Armaflex
insulation if it will be subjected to freezing tempera-
tures such as routing through unheated areas or
through an unused chimney.
When combustion air pipe is installed above a sus-
pended ceiling, the pipe must be insulated with 1/2"
Armaflex type insulation. The combustion air pipe
should also be insulated when it passes through a
warm, humid space.
NOTE: Vent pipe must be sloped 1/4" per foot to allow con-
densate to flow back to the furnace.
METHOD THREE: TWO PIPE SYSTEM USING COM-
BUSTION AIR FROM A VENTILATED ATTIC SPACE
This type installation requires two properly sized pipes. One
brings combustion air from a properly ventilated attic space
and a second pipe from the furnace vent connection (top right
of unit) exits to the outdoors.
In Canada, refer to CAN/CGA-B149.1 or.2 Installation
Code (latest edition - Venting Systems and Air Supply)
COMBUSTION AIR INTAKE
Refer to Tables 4 or 5 on Page 14 or 15, for intake pipe siz-
ing, allowable length and elbow usage. Follow all notes, pro-
cedures and required materials in the Two-Pipe Sealed
Combustion section (Method 1) when installing the combus-
tion air pipe within the unit and into the ventilated attic space.
COMBUSTION AIR TERMINATION
Refer to Figure 30, for required termination method and con-
figuration for the intake pipe. For attic termination, use two 90
elbows with the open end in a downward position. Be sure to
maintain 12" clearance above any insulation, flooring or other
Unitary Products Group
Be sure to instruct the owner not to block this intake
pipe.
FIGURE 30 : Attic Combustion Air Termination
COMBUSTION AIR REQUIREMENTS
The ventilated attic space from which the combustion air is
taken must comply with the requirements shown on page 13
in this instruction or in Section 5.3, Air for Combustion and
Ventilation of the National Fuel Gas Code, ANSI Z223.1 (cur-
rent edition).
VENT PIPE
For vent pipe sizing, allowable length and elbow usage, see
Tables 4 or 5 on Page 14 or 15. Follow all notes, installation
procedures and required materials in the METHOD TWO:
ONE PIPE SYSTEM on Page 17 to install the vent pipe from
the unit to the outdoors.
VENT TERMINATION
The vent pipe termination must be installed within the allow-
able locations, (Refer to Figure 26 on Page 20) and Section
7.8 in the National Fuel Gas Code, ANSI Z223.1 (current edi-
tion). Follow all local agency and utility requirements if more
restrictive than those shown. For vent termination, refer to
Figure 27 thru Figure 29.
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