Lochinvar TNR-I&S-02 Installation & Service Manual page 10

TNR-I&S-02
This unit can be vented using only PVC (Class 160, ASTM D-2241
Schedule 40, ASTM D-1785; or Cellular Core Schedule 40 DWV, ASTM
F-891), Schedule 40 CPVC (ASTM F-411) pipe. The fittings, other
than the TERMINATIONS should be equivalent to PVC-DWV fittings
meeting ASTM F-2665. (Use CPVC fittings, ASTM F-438 for CPVC pipe.)
If CPVC pipe and fittings is used, then the proper cement must be
used for all joints, including joining the pipe to the Termination (PVC
material). PVC materials should use ASTM –D2564 grade cement;
CPVC materials should use ASTM F-493 grade cement.
For water heaters in locations with high ambient temperatures (above
100° F) and/or insufficient dilution air, it is recommended that CPVC
pipe and fittings (MUST USE SUPPLIED VENT TERMINAL) be used.
Horizontal Installation:
In a horizontal application, it is important that condensate not be allowed
to buildup in the exhaust vent pipe. To prevent this from happening, the
pipe should be installed with an slight upward slope. The vent system
should be supported every 5 feet of vertical run and every 3 feet of
horizontal run of vent pipe length.
Stress levels in the pipe and fittings can be significantly increased by
improper installation. If rigid pipe clamps are used to hold the pipe in
place, or if the pipe cannot move freely through a wall penetration, the
pipe may be directly stressed, or high thermal stresses may be formed
when the pipe heats up and expands. Install accordingly to minimize such
stresses.
Follow the following procedure to vent through the wall:
1. Cut one 3 ½ in. (9.0 cm) diameter hole (for 3" (7.6 cm) diameter
pipe) or 4 ½" (11.5 cm) diameter hole (for 4" (10.2 cm) diameter
pipe).
2. Use the proper PVC cement or sealant to secure the 90° exhaust vent
terminal provided with the water heater to the plastic pipes. The
distance between the back edge of the 90° exhaust vent terminal and
the exterior wall (see Figure 14) must be 6 inches (13.0 cm). Use the
proper cement and assembly procedures to secure the vent connector
joints between the terminal and the blower outlet. Provide support
brackets for every 3 feet (1.0 m) of horizontal vent.
NOTICE
Figure 14
Typical Horizontal Power Vent System
Vertical Installation:
Vertical venting must be supported every 5 feet of vertical run and every 3 feet
of horizontal run of vent pipe length.
Stress levels in the pipe and fittings can be significantly increased by improper
installation. If rigid pipe clamps are used to hold the pipe in place, or if the pipe
cannot move freely through a wall penetration, the pipe may be directly
stressed, or high thermal stresses may be formed when the pipe heats up and
expands. Install accordingly to minimize such stresses.
Follow the following procedure to vent through the roof:
1. Cut the necessary holes through the roof and ceiling.
2. Install the exhaust vent and air intake plastic pipes as shown in
Figure 15. Make sure that the installation meets the local codes
and/or The National Fuel Gas Code ANSI Z223.1 (Latest Edition) or
CGA/CAN B149 Installation Code.
Figure 15
Typical Vertical Power Vent System Installation
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