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• Vent pipe clearance: do not install the vent piping near any high temperature steam lines, radiant heaters, or
other sources of heat.
• Condensate drain connections: during operation, condensate is produced both in the heater and in the venting
system. Therefore, the installation requires a condensate drain from the secondary heat exchanger and from the
vent pipe. For safe performance of the heater, each condensate drain must include a trap. Install the condensate
drains in accordance with the Condensate Drain Installation section.
Vent/Combustion Air System Piping Joints
• Piping joints: when ready to install the vent system, ensure that piping joints are in accordance with the following:
• Combustion air piping: secure slip-fit joints of single-wall combustion air pipe using sheet metal screws or
rivets. Seal joints and seams with aluminium tape or silicone sealant.
• Vent piping: the schedule 40 PVC or CPVC vent system should be installed in a manner consistent with normal
industry standards and in compliance with all local fire and building code requirements. Failure to follow proper
installation practices, procedures, or techniques can result in system failure, property damage, or personal injury.
The installer is responsible for the installation. Read the following procedure before beginning installation:
NOTE: Install piping joints one at a time. Pipe and fittings should be assembled quickly while ce-
ment is fluid.
1. Cut pipe square—angled cut may result in joint failure:
a. Remove all burrs from inside and outside diameter of cut end of pipe burrs using deburring tool, file, or knife
edge.
b. Chamfer (bevel) end of pipe 10 to 15 degrees.
c. Remove surface dirt, grease, and moisture from pipe sections and fittings using clean dry cloth.
2. Check for proper fit—test fit using light pressure:
a. Install dry pipe one-half to one-third of way into fitting hub.
b. Ensure that pipe and fittings are not too tight or too loose.
3. Apply primer to pipe and fitting surfaces using 2–3 applicator brush:
a. Ensure that primer conforms to ASTM F 656.
b. Ensure that primer does not puddle inside system.
4. Apply cement using 2–3 applicator brush, quickly assembling joint while cement is fluid:
a. Ensure that cement conforms to ASTM D 2564.
b. Apply full even layer of cement to pipe OD slightly greater than depth of socket on coupler (fitting).
c. Coat coupler (fitting) socket with medium layer of cement, ensuring that cement does not puddle inside system.
d. Apply second full even layer of cement to pipe OD.
5. Join pipe and coupler (fitting):
a. Working quickly while cement is fluid, insert pipe into coupler (fitting) until it touches socket bottom.
a. Turn pipe quarter turn and hold joint together until pipe will not pull out.
b. Clean excessive cement from exterior—properly made joint will have continuous bead of cement around
perimeter.
Table 9. Combustion Air Piping Size Requirements
Unit
Size
Pipe
Section
Diameter
(Inches (Millimeters))
Length (Feet (Meters))
Minimum Maximum
130, 180, 260, 310
Heater to concentric
adapter box
6 (152)
3 (
914) Same as vent pipe
Concentric adapter box
to outdoors
8 (203) Refer to Vent Terminal Options section
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