State Water Heaters SUF 60120 THRU Instruction Manual page 55

SUPPLY GAS PRESSURE ADJUSTMENT
Supply gas pressure shall be measured while the water heater is
not firing (static pressure) AND while the water heater is firing at
full capacity (dynamic pressure).
Fire and Explosion Hazard
Do not use water heater with any gas
other than the gas shown on the rating
label.
Excessive gas pressure to gas valve can
cause serious injury or death.
Turn off gas lines during installation.
Contact a qualified installer or service
agency for installation and service.
If the supply gas pressure to the water heater is not between
the required minimum and maximum values given in
(page 11) adjust the supply gas regulator as necessary. Adjust
the supply gas regulator(s) per the regulator manufacturer's
instructions to achieve the required "static" and "dynamic" supply
gas pressure.
Multiple Water Heater Installations:
In multiple water heater installations or in installations where
the installed water heater(s) share a common gas supply main
with other gas fired appliances; the supply gas pressures shall
be measured at each water heater with all gas fired appliances
connected to a common main firing at full capacity.
On multiple water heater installations the supply gas line regulators
shall be adjusted to provide gas pressure to each water heater
within the minimum and maximum supply pressure requirements
listed in (page 11) with all gas fired appliances connected
Table 4
to a common gas main firing at full capacity.
Note: A pressure drop of more than 1.5" W. C. (0.37 kPa)
when the Main Burner ignites is an indication of an
inadequate supply of gas and can lead to ignition
failure, rough starts and/or rough operation. If a drop
of more than 1.5" W. C. (0.37 kPa) in supply gas
pressure occurs when the Main Burner ignites, ensure
the supply gas lines and regulator(s) are properly
sized and installed. See the requirements for
Gas Regulator
Table 4
See
Supply Gas Line Installation
Gas Regulator
and installation instructions are maintained.
55
and (page 13).
Gas Supply Systems
(page 40) and
(page 13). Ensure all requirements
Supply
Supply