Technical Service Manual
MKG Series Gas Griddles
L22-296 Rev 0 (4/08)
Page 5
Photo 1
Photo 1a
Photo 2
Photo 2a
2
Theory Of Operation
This section will demonstrate the basic sequence of
operation for Snap Action and Matchless (E/ST)
Ignition series.
2.1
HEATING SYSTEM –SNAP ACTION
SERIES
•
Pilots are lit by, (See Photo 1):
-
Opening the shut off valve (C)
-
Depressing the Piezo spark buttons (A)
while depressing and holding the button on
the safety valve (B) to ignite flame at pilot.
-
Once ignited, keep button (B) depressed
for 20 seconds to lock in the safety valve.
•
Once safety valve is locked in, the "snap acting”
gas thermostats supply gas to their respective
burners upon “call for heat “.
•
The thermostats cycle gas to the
burners to maintain cooking surface
temperatures at set point.
•
Burner operating pressure is measured at the
pressure tap on the shut off valve (C), and
controlled by the gas regulator (D), mounted in
the back of the unit, See Photo 1a.
2.2
HEATING SYSTEM –MATCHLESS
IGNITION SERIES (E / ST)
•
Start up of Unit, (See Photo(s) 2, and 2a):
-
Open the shut off valve (C)
-
Press Rocker Switch (A), to ON (I) for
each 12” zone to ignite pilots.
-
Set thermostat controls (B) to set point
•
When the appliance is plugged in, power is
supplied to the rocker switches through an in-
line fuse. The rocker switches are located on
the control panel, centered on each 12” zone.
•
The rocker switches (A) are double pole (DP).
One set of contacts supplies power to the
ignition modules (and to the Solid State
temperature control boards on -“ST” Series).
The second set of contacts switches power
from the thermostat control (B), to the main
gas valve solenoids allowing gas to the main
burners.
•
The ignition modules supply spark energy to
the ignitor electrodes and power to the pilot
gas valve solenoids to establish pilot flames.
The modules also rectify pilot flame by means
of integral flame sense (spark and flame sense
supplied through the ignition wire).
