Gas Pressure; Gas Valve Replacement - Lochinvar 151 Installation & Operation Manual

7
Gas connections
17. Check burner performance by cycling the system while
you observe burner response. The burner should ignite
promptly. Flame pattern should be stable. Turn system
off and allow burner to cool, then cycle burner again to
ensure proper ignition and flame characteristics.
Figure 7-6 Inlet Gas Supply Check - Models 151 - 286
LOOSEN THE SET SCREW ONE (1) FULL TURN AND
PLACE THE MANOMETER TUBING OVER THE
PRESSURE TAP
Figure 7-7 Inlet Gas Supply Check - Model 400
LOOSEN THE SET SCREW ONE (1) FULL TURN AND
PLACE THE MANOMETER TUBING OVER THE
PRESSURE TAP
Figure 7-8 Inlet Gas Supply Check - Model 501
LOOSEN THE SET SCREW ONE (1) FULL TURN AND
PLACE THE MANOMETER TUBING OVER THE
PRESSURE TAP
(continued)
Figure 7-9 Inlet Gas Supply Check - Models 601 - 801

Gas pressure

DETAIL
The gas pressure must remain between 4 inches w.c. (natural),
8 inches w.c. (LP) minimum and 14 inches w.c. (natural and
LP) maximum during stand-by (static) mode and while in
operating (dynamic) mode. If an in-line regulator is used, it
must be a minimum of 10 feet from the Armor water heater. It
is very important that the gas line is properly purged by the gas
supplier or utility company. Failure to properly purge the lines
or improper line sizing, will result in ignition failure.
The 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.

Gas valve replacement

DETAIL
The gas valve MUST NOT be replaced with a conventional gas
valve under any circumstances. As an additional safety feature,
this gas valve has a flanged connection to the venturi and blower.
DETAIL
Installation & Operation Manual
REMOVE THE 1/8" (3 MM) PIPE PLUG ON
THE INLET FLANGE TO THE VALVE AND
INSTALL A SUITABLE 1/8" (3 MM) FITTING
(FIELD SUPPLIED) FOR THE MANOMETER
TUBING.
Failure to follow all precautions could result
WARNING
in fire, explosion, or death!
DO NOT adjust gas valve outlet pressure.
WARNING
The gas valve is factory-set for the correct
outlet pressure.
for natural gas and propane, requiring
no field adjustment. Attempting to alter
the gas valve outlet pressure could result
in damage to the valve, causing potential
severe personal injury, death, or substantial
property damage.
DETAIL
This setting is suitable
47