Owner`s manual
20
P40U / P40U-I &O Manual
IM101220
RD: DEC 2011
RL: 1A - BA
VERTICAL VENT THROUGH THE ROOF:
It is the sole responsibility of the installer to
adhere to all current local codes and/or ANSI
Z223.1 / CSA.B149.1 latest editions for all
venting requirements, and practices.
Use an approved ‘B-vent’ termination cap
as supplied by the manufacturer of the ap-
proved ‘B-vent’.
When vent and combustion air are taken
through the roof, the exhaust vent should
always terminate higher than the combus-
tion air intake, to prevent recycling the
products of combustion back into the
heater.
A maximum of three 90° elbows (each = equivalent 10 ft) can be installed in a vertical vent
Approved
Cap
Approved
‘B’ Vent
24”
60 cm
12
9
If roof slope exceeds 9:12
consult NFPA-54 ANSI
Z223.1 or CSA-B149.1
10. COMBUSTION AIR DUCTING
Whenever possible, locate the air intake and vent terminals in a common pressure area. For
example on a common wall, or commonly through the roof. Depending upon wind conditions,
terminations located in uncommon pressure areas can create intermittent operation problems.
Combined Length of Vent and Combustion Air Duct:
This model heater can have a maximum combined total length of flue vent and combus-
tion air duct equivalent to 50 feet
Total vent and duct length is reduced by ten feet for every 90° elbow installed in the vent
or duct system
Exceeding the allowable lengths noted above may cause unreliable operation, and create
condensation or soot conditions and will void CSA Certification and the heater warranty.
An opening is located on the top surface of the burner housing for combustion air . Ensure ade-
quate clearance around this opening to allow sufficient combustion air supply to the heater.
Combustion air duct must be constructed of noncombustible material.
When a tube heater is operated in a negative air condition, or air-born dust or contaminants are
present as in woodworking and welding shops, air for combustion must be ducted from outside
the negative or contaminated area to the 4 inch (10 cm) diameter intake flange supplied on the
blower. Maximum combined equivalent vent and duct length is 50 ft.
The air intake will not be located less than:
Three feet above grade
Twelve inches from flue vent terminal of any heater with input up to 100,000 Btu/hr
Three feet from flue vent terminal of any heater over 100,000 Btu/hr
Do not install filters on the combustion air intake.
Ensure adequate clearance around the air intake to allow sufficient combustion air sup-
ply to the heater.
continued ...
FIGURE 11
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