Gas Pressure; Gas Valve Replacement - Lochinvar Crest 2.5 Installation & Operation Manual

6
Gas connections
Do not check for gas leaks with an open
WARNING
flame -- use the bubble test.
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 TOUCH 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.
Figure 6-4 Inlet Gas Supply Check
34

Gas Pressure

Failure to
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 4 inches w.c.
(.99 kPa) minimum and 14 inches w.c. (3.5 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 Crest 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.
Ignition problems are 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, the gas valves have flanged
connections to the venturis and blowers.
WARNING
WARNING
Installation & Operation Manual
Failure to follow all precautions
could result in fire, explosion, or
death!
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
damage.
property