John Wood Polaris Commercial High-Efficiency - Manual (Page 18)

18
Gas Pressure Testing
Important: This water heater and its gas connection must
be leak tested before placing the appliance in operation.
•
If the code requires the gas lines to be tested at a
pressure of 14” W.C. (3.486 kPa) or greater, the water
heater and its manual shut-off valve must be discon-
nected from the gas supply piping system and the line
capped.
• If the gas lines are to be tested at a pressure less
than 14” W.C. (3.486 kPa), the water heater must be
isolated from the gas supply piping system by closing
its manual shut-off valve.
Nationally listed/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.
Note: Air may be present in the gas lines and could prevent
the burner from lighting on initial start-up. The gas lines
should be purged of air by a qualified service technician
after installation of the gas piping system.
Explosion Hazard
Have a qualified person make sure that
the L.P. gas operating pressure does not
exceed 13” water column (3.237 kPa).
Examples of a qualified person include
licensed heating personnel, authorized
gas company personnel, and authorized
service personnel.
Failure to do so can result in death,
explosion, or fire.