7.2.1.6
Joints
Provide pipes and fittings in type specified in Paragraph 7.2.1.1, page 13.
When ready to install the vent system, follow the instructions below
to make joints.
Vent Pipe
7.2.1.5 Combustion Air Pipe Diameter and
Length
Combustion Air Pipe
Secure slip-fit joints of single-wall combustion air pipe with sheetmetal
screws or rivets. Seal joints and seams with aluminium tape or silicone
sealant.
• Minimum length of pipe between the heater and the concentric adapter
box is 3 ft (914mm). The minimum/maximum requirements of the length
of vent pipe that extends outdoors are different for horizontal and vertical
vent terminals. See instructions for Option CC2 or Option CC6.
The Schedule 40 PVC or CPVC vent system should be installed in a man-
ner consistent with normal industry standards and in compliance with all
local fire and building code requirements. Failure to follow proper installa
-
tion practices, procedures, or techniques can result in system failure, prop-
erty damage, or personal injury. The installer is responsible for the installa-
tion. Read all of the procedures below before beginning installation. Make
joints one at a time as pipe and fitting should be assembled quickly while
cement is fluid.
Cut the pipe square.
An angled cut may result in joint failure.
Remove burrs using a deburring tool, a file, or a knife edge. Re
-
move all burrs from the inside and outside diameter of the cut end of
the pipe. Chamfer (bevel) the end of the pipe 10° to 15°.
Use a clean dry cloth to remove surface dirt, grease, and moisture
from the pipe sections and fittings.
Check for Proper Fit
With light pressure, test the fit. A dry pipe should go one-half to one-third
of the way into the fitting hub. Do not use pipe or fittings that are too tight
or too loose.
Primer, Cement, and Applicator Requirements
Primer for joints should conform to ASTM F 656.
Cement for joints should conform to ASTM D 2564.
Use a 2-3” applicator brush for the 4” pipe and fittings.
Applying Primer and Cement
(NOTE: Make joints one at a time as pipe
and fitting should be assembled quickly while cement is fluid.)
1.
a)
b)
2.
3.
a)
b)
c)
4.
7.2 Venting and
Combustion Air
(cont’d)
7. Mechanical
(cont’d)
7.2.1 Vent/Combustion
Air System
Requirements
(cont’d)
Diameter and Length of the Combustion Air Inlet Pipe
Model UEAS 130, 180, 260, 310
Diameter
Length
Section From Heater to Concentric
Adapter Box
6"
Same as Vent Pipe
(152mm)
Section From Concentric Adapter Box to
Outdoors
8"
See Instructions for Option
CC2 or CC6
(203mm)
Vent
Pipe Diameter and Maximum
Vent
Pipe
Length from Heater to
Terminal End for Vertical and Horizontal Vent
Model
UEAS
Vent Pipe
Diameter
Maximum Vent
Pipe Length
Equivalent Straight Length for a
90° Sweep Elbow*
45° Elbow
inches
mm
feet
M
feet
M
feet
M
130, 180,
260, 310
4
102
50
15.2
8
2.4
4
1.2
*
All 90° elbows in the vent system must be sweep type.
7.2.1.4 Vent Pipe Diameter and
Length
Form I-UEAS, Page 16
