41
LP-454 REV. 1.6.15
Nominal Iron
Pipe Size (In.)
Table 8 – Source – ANSI Z223.1
It is recommended that a soapy solution be used to detect leaks. Bubbles will
appear on the pipe to indicate a leak is present. The gas piping must be sized for
proper flow and length of pipe to avoid excessive pressure drop. Both the gas
meter and the gas regulator must be properly sized for the total gas load. If you
experience a pressure drop greater than 1" WC, the meter, regulator or gas line
is undersized or in need of service. You can attach a manometer to the incoming
gas drip leg by removing the cap. The gas pressure must remain between 3.5"
WC and 14" WC during stand-by (static) mode and while in operating (dynamic)
mode at full output.
If an in-line regulator is used, it must be a minimum of 10 feet from the
heater. It is very important that the gas line is properly purged by the gas
supplier or utility. Failure to properly purge the lines or improper line sizing
will result in ignition failure. This problem is especially noticeable in NEW LP
installations and also in empty tank situations. This can also occur when a utility
company shuts off service to an area to provide maintenance to their lines. The
gas valve must not be replaced with a conventional gas valve under any
circumstances. As an additional safety feature, the gas valve in this water heater
has a flanged connection to the swirl plate and blower.
C. GAS VALVE
Figure 25 – Gas Valve
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