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Installation & Operation Manual
42
ƽ WARNING
When re-tightening the set screw, be sure
to tighten securely to prevent gas leaks.
Do not check for gas leaks with an open
flame -- use the bubble test. Failure to use
the bubble test or check for gas leaks can
cause severe personal injury, death, or
substantial property damage.
14. Turn on the gas supply at the manual gas valve.
15. Turn the power switch to the “ON” position.
16. Adjust the temperature set point on the control panel of
the SMART SYSTEM control module to the desired
water temperature so the appliance will call for heat.
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.
Gas Pressure
The gas pressure must remain between 4 inches w.c.
(.99 kPa) minimum and 14 inches w.c. (3.5 kPa) maximum
for Natural gas and between 8 inches w.c. (1.9 kPa)
minimum and 14 inches w.c. (3.2 kPa) maximum for LP gas
during standby (static) mode and while in operating
(dynamic) mode. If an in-line regulator is used, it must be a
minimum of 10 feet (3 m) from the Knight XL boiler. 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
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.
Figure 7-5 Inlet Gas Supply Check - Model 399
LOOSEN THE SET SCREW ONE (1) FULL TURN
AND PLACE THE MANOMETER TUBING OVER
THE PRESSURE TAP.
Figure 7-6 Inlet Gas Supply Check - Model 500
DETAIL
LOOSEN THE SET SCREW ONE (1) FULL TURN
AND PLACE THE MANOMETER TUBING OVER
THE PRESSURE TAP.
Figure 7-7 Inlet Gas Supply Check - Models 600 - 800
DO NOT adjust or attempt to measure
gas valve outlet pressure. Attempting to
alter or measure the gas valve outlet
pressure could result in damage to the
valve, causing potential severe personal
injury, death, or substantial property
damage.
Failure to follow all precautions could
result in fire, explosion, or death!
ƽ WARNING
ƽ WARNING
DETAIL
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.
7 Gas connections