Garland GF SENTRY SERIES GAS RESTAURANT RANGES - Manual (Page 14)

Part # 4525587 Rev 4 (29 April 14) Page 14
Flame Failure Technology
The Garland GF series gas range has total fl ame failure (also
referred to as fl ame safety) technology. It is a simple system
that monitors the existence of a gas fl ame. It can be used on
most gas appliances and will turn off the gas supply to any
burner using the system when a pilot ignition fl ame is not
present.
Flame failure systems have been available for many years
and it is the “CE” agency standard accepted for European gas
appliance approvals. In North America this technology is
gaining greater acceptance and various levels of government
are making it mandatory in schools and other government
institutions.
How Flame Failure Technology Works
For gas restaurant ranges, there are three principles at
work in a fl ame failure system, they are a safety valve, the
thermocouple and the pilot.
Safety Valve
The SIT control used on the new Garland series of restaurant
ranges operates both as the mechanism to control the
oven temperature (thermostat) and the safety valve for the
fl ame failure system. This valve contains a magnet which
when electrically charged, will hold a check valve in an open
state allowing for gas to fl ow through the valve as required
by either the pilot or main burner. The magnet is charged
through an electrical signal sent from the thermocouple
when a fl ame is present. When no fl ame is present, no signal
is sent and the magnet releases closing the check valve.
Because no gas can fl ow through the valve if the pilot is not
burning, no gas can build up, decreasing the risks a of any
safety conditions.
Thermocouple
The thermocouple is positioned so that the tip of the
thermocouple comes into contact with the pilot fl ame
when lit. When exposed to a fl ame, a properly functioning
thermocouple produces a small electrical signal measured
in millivolts. This signal is transferred through the electrical
wire connecting the thermocouple to the safety valve in
the SIT control, and to the magnet inside the valve thereby
energizing it. Again, when the magnet is energized, it is able
to hold a check valve in an open state allowing gas to fl ow
through the valve to the burner(s) and pilot(s). If the pilot
goes out then the generation of millivolts stops and the
magnet in the safety valve releases to close off the supply
gas.
Pilot
The pilot provides the fl ame that the thermocouple uses to
generate millivolts. When all three of the above components
are placed together a Flame Failure system is created.
The above principles apply no matter what section of the
range is using fl ame failure technology. When operating
open top burners or hot tops the hi-lo valve also acts as a
safety valve in the system. The same SIT thermostat as in the
oven section of the range is used on fl at griddle models.
Burner Operation
Caution: In the event that a binding or malfunctioning
valve, or thermostat control is observed DO NOT light the
pilots or continue operation until an authorized service
technician has inspected the appliance. Failure to do so
may result in injury.
Open Top burners
Lighting
1. Push in the valve knob, and turn it counter clockwise to
the ignition “ ” position.
2. While holding the valve knob fully in, light the pilot
burner with a match or BBQ ignition device.
Note: On ranges equipped with electric spark igniters, press
the igniter button and check that the pilot lights. Should
burner ignition fail within 4 seconds, turn the burner valve
off and repeat steps 1 through 2. If ignition continues to fail,
consult the factory authorized service agency.
3. When the pilot is lit continue to hold the valve knob fully
in for at least 30 seconds, then release it. If the pilot goes
out, wait for (5), minutes, then repeat from step 1.
4. When the pilot remains lit, push the valve in again and
turn it counter-clockwise to the desired fl ame setting
position, lighting the burner.
OPERATION