16
Installation Manual
Gas Piping
Danger
•
Do not connect to an unregulated or high pressure propane
line or to a high pressure commercial natural gas line.
•
The water heater must be isolated from the gas supply
piping system during any pressure testing of that system at
test pressures equal to or more than 0.5 psig.
Warning
•
Only a licensed professional should connect the gas
supplies.
•
Before connecting the gas supply, determine the gas type
and pressure for the water heater by referring to the rating
plate. Using a different gas type will result in abnormal
combustion and malfunction of the water heater causing
fire or explosion.
•
Leak test the appliance and its gas connection before
operating the water heater.
•
Do not attempt a field conversion without a Vesta
conversion kit. Use the Vesta conversion kit to convert from
natural gas to propane or vice versa. Failure to do so may
result in dangerous operating conditions and will void the
warranty.
In the United States: The installation must conform with local codes
or, in the absence of local codes, the National Fuel Gas Code ANSI
Z223.1/NFPA 54.
In Canada: The Installation must conform to CGA B149
INSTALLATION CODES and/or local installation codes.
To ensure a sufficient gas supply, it is recommended that the water
heater be the first appliance to be connected to the gas supply line.
To connect the gas supply:
1
Determine the gas type and pressure by referring to the rating
plate.
2
Perform a pressure test on the main gas supply line.
3
Purge the gas line of any debris.
4
Determine the proper type and size for the gas line. Refer to
the gas pipe sizing tables on page 15.
5
Install a union.
6
Install a manual gas shut off valve on the gas supply line
within easy reach of the appliance.
Warning
•
Improper installation of the manual gas shut-off valve may
result in property damage, personal injury or death.
•
Only a licensed professional, in accordance with the ANSI
Z21.1/CSA 9.1, should install the manual gas shut-off valve.
7
Connect the gas supply line.
Side view
8
Check for gas leaks at all joints.
Notice
•
Tighten the water heater connection valves with care to avoid
damage.
•
Apply gas leak detection solution to all gas fittings.
•
The minimum internal diameter required for any appliance connector
is ¾ ”.
•
When using flexible gas lines, ensure that the pipe’s inner diameter
and connector is sufficient to supply the required BTUs. Also, ensure
that the flexible line has no crimps or tight bends in it, as this will
restrict gas flow.
•
To facilitate any future maintenance or service, the installation
of a union on the gas supply line close to the water heater is
recommended.
•
The following is a LP gas piping example for the single regulator
system
Full-size
gas pipe
Full-size gas pipe
1/4"–3/8" pipe
Gas tank
Gas regulator
(12" WC)
Summary of Contents for VH-150
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