LAARS Mighty-Stack TL80-199 - Installation, Operation and Maintenance Instructions - Manual (Page 10)

LAARS Heating Systems Company
Page 10
Figure 10. Horizontal Vent Terminations.
(b) Vent Termination
A side wall vent terminal (hood) must be used
when the water heater is vented through a side wall.
Use Laars Part Number D2004300, 4" (102 mm) dia.
The vent hood provides a means of installing vent pipe
through the building wall, and must be located in
accordance with ANSI Z223.1/NFPA 54, or in Canada
CAN/CGA-B149 and local applicable codes (see
Figure 9).
Locate the vent terminal so that it cannot be
blocked by snow. Most codes require that the
termination be at least 12 inches (305 mm) above
grade, but the installer may determine it should be
higher depending on local conditions.
1M. Water Piping
1. To prevent damage to the unit, all soldering must
be done before making any connections to the
heater or the tank.
2. If a backflow preventer, pressure reducing valve,
or check valve is included in the cold water
supply line, you must provide a way to control
thermal expansion of the water in the tank. This
will prevent the temperature and pressure relief
valve from being forced open repeatedly. For
advice on controlling this situation, contact the
water supplier or local plumbing inspector.
Install an expansion tank of the proper size, as
shown in Figure 11.
3. The discharge piping for the pressure relief valve
must be directed so that the hot water cannot
splash on anyone. Attach the run-off tube to the
pressure relief valve, and run the end of the tube
to within 6" (152 mm) of the floor. Do not install
any reducing couplings, valves, or any other type
of restriction in this line. This run-off tube must
be installed to allow free and complete drainage
of both the valve and the run-off tube.
WARNING
Don’t install the run-off tube so the end terminates
outdoors. This could allow a freezing condition to
plug the end of the pipe. If the run-off tube is
allowed to remain blocked, an explosion may result.
This can cause property damage, personal injury,
or death.
Figure 11. Expansion Tank Installation.
Dimensions shown
in feet (m).