7
Dual Fuel Supplemental Manual
WARNING
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 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.
18. Repeat Steps 1 - 17 for both natural and LP gas supply.
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.
Figure 1-1 Inlet Gas Supply Check_Natural
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!
WARNING
WARNING
1
Gas connections
(continued)
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 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.
Figure 1-2 Inlet Gas Supply Check_Propane
IMG00065
