13
Gas Supply Connection
The M255 P is designed so that a one-pound propane
cylinder may be connected to the gas ignitor. Thread
the cylinder on to the regulator installed on the gas
valve (Fig. 11). This configuration works well for all
temperatures.
Fig. 11
Other sizes of portable propane cylinders may be
connected to the regulator with the proper hose and
fittings.
Because liquid propane (LP) evaporates and turns to
gas at a slower rate when the temperature of the tank
is lower, sustained temperatures below 0˚F (-18˚C) will
lead to reduced gas pressure in small LP tanks. This
will lead to a drop in burner manifold pressure while
the burner is operating. If sustained temperatures below
0˚F (-18˚C) are expected, a properly installed tank of
at least 100-lb capacity must be installed (see Fig. 12).
Fig. 12
Temperatures below 0˚F (-18˚C) also will cause small
LP gas regulators to work incorrectly, outputting gas
pressures that are too high or too low. A two-regulator
system using a first-stage and a second-stage regulator,
or a combination two-stage regulator (p/n 1930) such as
the one shown in Fig. 13 should be used.
Fig. 13
CAUTION
Make sure all covers for the gas ignition system
on the appliance are in place during operation
and service.
WARNING
Once the gas supply is connected, the appliance
and gas connection must be tested for leaks
before placing the appliance in operation.
For temperatures below 0˚F (-18˚C), use either the
configuration in Fig. 11 or the one in Fig. 13 with a
2-stage regulator system and a larger tank.
How to Operate the Gas Ignitor
The outdoor furnace utilizes a gas burner to ignite the
fuel in the burn chamber. The FireStar controller can
also be set to automatically relight the fuel if needed.
NOTE: For more detailed information, refer to
the FireStar Controller Operating Instructions
section.
There are two ways to start the gas burner:
1. Press and hold the Ignition button on the FireStar
controller until the LED display indicates
and
the burner fan operates.
NOTE: The gas burner will start regardless of the
temperature of the burn chamber; however, if the
temperature of the burn chamber is greater than
350˚F (177˚C), the gas burner will immediately
shut off.
2. If Auto Relight is enabled and the controller is in
NORMAL or MEDIUM mode, the ignition process
will start if the burn chamber temperature falls below
300˚F (149˚C).
SECTION 4 – GAS SUPPLY CONNECTION (P Models) AND
IGNITOR OPERATION
Section 4 - Gas Supply Connection and Ignitor Operation
