Technical Service Manual
MKG Series Gas Griddles
Page 6
L22-296 Rev 0 (4/08)
Photo 4
Photo 3
Photo 5
•
Once pilots ignite, the ignition modules will
send power to the burner valves, traveling first
through the thermostat control, then through the
second contacts of the rocker switches.
•
The Solid State temperature controls or the
Electric thermostats, cycle the power to
maintain set temperature.
•
Burner operating pressure is measured at the
pressure tap on the shut off valve (C), and
controlled by the gas regulator (D), both
mounted in the back of the unit, See Photo 2a.
2.3
TEMPERATURE CONTROL SYSTEMS
•
Snap action appliances have bulb and capillary
style “Gas Operated” thermostats. The
thermostat has a temperature range of 200° to
450°F. See Photo 3 for identification.
•
Electric thermostat (-E) models have a bulb and
capillary style “Electro-mechanical Operated”
thermostats. The thermostat has a temperature
control range of 200° to 550°F. See photo 4 for
identification.
•
The Solid State (-ST) model has temperature
control system consisting of a solid state board,
and a Thermistor probe. The sensing probe is
connected to the control board via “push-on”
terminals. The control has a temperature range
of 150° to 550°F. See Photo 5 for identification.
Notice:
Matchless Ignition (E/ST) models have flame
proving park ignition systems. An external power
supply is required on these models.
Notice:
The sensing bulbs or Thermistor probes for each
of the controls are embedded in a slot on the
underside of the cooking surface. The Snap-Action
and Electric thermostat bulbs are “pressed” into
the slot. The Thermistor probe is “inserted” into a
hole at the end of the slot.
3
Temperature Calibration
Each temperature control operates a twelve- (12)
inch zone. Each zone consists of two burners
(except for zones containing a left or right grease
chute/trough). There are three different control
options as noted in Section 2.3. The controls are
factory set. However, if the cooking surface
temperature varies greatly from the setting on the
thermostat knob, adjust the thermostat using the
following procedure:
3.1
TEMPERATURE MEASUREMENT:
Using a calibrated instrument with a surface probe,
measure the temperature in the center of each
zone, 12” in from the front edge of the cooking
surface. The zone centers are located side to side
by the following: (1) Matchless ignition I/O
switches, (2) Snap-Action thermostat knobs, or (3)
Arrows located on the griddle front top rail. The
zone should run at set temperature for at least 30
minutes to allow the zone to stabilize prior to the
calibration check. The temperature will vary with
burner cycling but should stay /- 15° F of
the knob setting. The thermostat knob should
indicate the average temperature of the
corresponding zone. If adjustment is required,
follow the instructions in Section 3.2 for the control
type in use.
3.2
CALIBRATION PROCEDURES:
3.2.1
Snap Action and Matchless (E) Series
•
Light pilots as described in section 2.1.
•
Set thermostat knobs to the desired
temperature and allow cooking surface to
stabilize for 30 minutes (1 hour if cold).
•
Remove the knob to expose the screw in the
center of the thermostat shaft.
Do not allow
thermostat shaft to turn
. For snap action
thermostat knobs refer to section 4.1.1. For
electric thermostat (E Series), remove knob by
pulling straight off thermostat shaft.
•
Remove any sealant over the head of the
screw with the tip of your screw driver.
