Instructions / Assembly

40
Venting
INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater (cont.)
Exhaust Vent Pipe
Air Intake Pipe
Wall Plate
Inspection
Access Panel
(Optional)
Inspection
Access Panel
(Optional)
Ceiling
Downward Slope
12"
(300 mm)
Horizontal Vent Installation
WARNING: Danger of fire or bodily
injury – Solvent cements and primers are highly
flammable. Provide adequate ventilation and do
not assemble near heat source or open flame. Do
not smoke. Avoid skin or eye contact. Observe all
cautions and warnings on material containers.
CAUTION: Use tankless water
heater manufacturer-approved Schedule 40 PVC
(foam core is not permitted at any time), Schedule
80 PVC, CPVC, ABS polypropylene, or UL
1738-listed Category III Stainless Steel. No other
vent material is permitted.
Joining Pipes and Fittings
All pipe, fittings, solvent cement, primers, and
procedures, for the U.S., must conform to American
National Standards Institute and American Society
for Testing and Materials (ANSI/ASTM) standards.
For Canada, all pipe, fittings, solvent cement,
primers, and procedures must conform to ULC-
S636 and vent manufacture specifications.
CAUTIONS:
• Do NOT use solvent cement that has become
curdled, lumpy, or thickened.
• Do NOT thin solvent cement. Observe shelf
precautions printed on the containers.
• For applications below 32°F, use only lower
temperature-type solvent cement.
• Appropriate solvent and cleaner must be used
for the type of vent pipe used (PVC, CPVC, or
ABS).
Cleaner-Primer and Medium-Body
Solvent Cement
All joints in vent piping must be properly sealed,
and we recommend using the following material:
PVC materials should use ASTM D-2564-grade
cement.
CPVC materials should use ASTM F-493-grade
cement.
ABS materials should use ASTM D-2235-grade
cement (ABS is not allowed in Canada).
Cementing Joints
1. Cut pipe end square; remove jagged edges and
burrs. Chamfer end of pipe; then clean fitting
socket and pipe joint area of all dirt, grease, or
moisture.
2. After checking pipe and socket for proper fit,
wipe socket and pipe with cleaner-primer. Apply
a liberal coat of primer to inside surface of
socket and outside of pipe.
3. Apply a thin coat of cement evenly in the
socket. Quickly apply a heavy coat of cement to
the pipe and insert pipe into fitting with a slight
twisting motion until it bottoms out.
4. Hold the pipe fitting for 30 seconds to prevent
the tapered socket from pushing the pipe out of
the fitting.
5. Wipe all excess cement from the joint with a
rag. Allow 15 minutes before handling. Cure
time will vary according to fit, temperature, and
humidity.
NOTICES:
• Cement must be fluid; if not, recoat.
• Stir the solvent frequently while using. Use a
natural bristle brush or the dauber supplied with
the can. The proper brush size is one inch.