Exhaust Venting
Vent Pipe System
This water heater is a Category 1, non-direct vented appli-
ance. The vent pipe must be sized and installed in accor-
dance with all local and provincial or state codes and with
the latest edition of
“Natural Gas and Propane Installation
Code” CSA-B149.1
in Canada,
“National Fuel Gas Code”
ANSI Z223.1 (NFPA 54)
in the U.S.A.
Check for proper vent size
It is possible that the existing venting system was sized,
for a previous installation, through a common vent. Such
an arrangement is appropriate for venting two appliances
such as the original water heater and a standard vent
furnace. If this is true and the second appliance has been
removed from the existing venting system (such as when
the furnace has been upgraded to a power vent type), the
venting system is now supplying only one appliance. This
condition is commonly referred to as “orphaning” the water
heater and the venting system must be properly resized for
a single appliance. Improper sizing can cause a number of
undesirable and potentially unsafe results including spillage
of the products of combustion into the room, poor combus-
tion, excessive condensation, pilot outage or delayed igni-
tion. The vent pipe must not be obstructed so as to prevent
the removal of exhaust gases to the outside atmosphere.
For proper sizing, refer to
"Natural Gas and Propane
Installation Code" CSA-B149.1
.
Note:
The horizontal section of the vent must slope up
21mm per metre (1/4 in. per foot), (see Figure 5).
CSA/U.L. recognized fuel gas and carbon monoxide (CO)
detectors are recommended in all applications and should
be installed using the manufacturer’s instructions and local
codes, rules or regulations.
Important:
If you lack the necessary skills required to prop-
erly install this venting system, you should not proceed, but
enlist the help of a qualified service technician.
Drafthood Installation
SLOPE UP 21mm PER METRE
(1/4 in. PER ft) MIN.
Figure 5
Vent
System
Hook the tab leg of the drafthood into the slot in the heater’s
top. Align the remaining legs with the hole/dimples and
secure the drafthood to the top with three screws. Do not
alter the drafthood in any way. If you are replacing an exist-
ing water heater be sure to use the new drafthood supplied
with the water heater.
Water Supply
Piping Installation
Figure 6
Example Of Water Piping Installation
IN A CLOSED SYSTEM USE EITHER:
1.THERMAL EXPANSION TANK
2.PRESSURE RELIEF VALVE
COLD WATER
INLET VALVE
UNION
PRESSURE REDUCING
VALVE WITH BYPASS
COLD WATER
INLET
TEMPERATURE AND
PRESSURE RELIEF VALVE
DISCHARGE LINE 300mm
(12 in.) MAX (CANADA) OR
150mm (6 in.) MAX (U.S.A.)
ABOVE DRAIN
M A S S A C H U S E T T S :
INSTALL A VACUUM
RELIEF IN COLD WATER
LINE PER SECTION
19MGL 142
DRAIN LINE 19mm
(3/4 in.) ID MIN
HOT WATER
OUTLET
PIPE
INSULATION
Piping, fittings, and valves should be installed according to
the installation drawing (see Figure 6). If the indoor installa-
tion area is subject to freezing temperatures, the water pip-
ing must be protected by insulation. Water supply pressure
should not exceed 550 kPa (80psi). If this occurs a pressure
reducing valve and/or an expansion tank may be required.
The pressure reducing valve should be placed on the sup-
ply to the entire house in order to maintain equal hot and
cold water pressures.
Important:
Heat must not be applied to the water fittings on
the heater as they may contain nonmetallic parts. If solder
connections are used, solder the pipe to the adapter before
attaching the adapter to the hot and cold water fittings.
Install the water piping and fittings as shown in Figure 6.
Connect the cold water supply to the fitting (3/4” NPT)
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