Garland CG-24, CG-36, CG-48, CG-72, CG-60 service manual What is a Chain Griddle, How Does it work?

WHAT IS A CHAIN GRIDDLE

Commercial chain restaurants impose strict food procedures on franchise owners and operators to guarantee the quality and consistency of the product.. Beef burgers, hamburgers, french fries, onion rings, fried chicken and tortillas for example, must meet rigid standards of quality involving the ingredients used, the recipes followed, storage and, not least, the cooking temperature and time of cooking..

Accuracy of temperature control and the heating stability of the cooking surface are essential in maintaining consistent quality in the product.. Control and stability are the two primary features in the new chain griddle.. As compared with previous gas griddles of the same kind, temperature control of heating zones in the chain griddle is far tighter and more precise..

Two features provide precision control.. One feature is a burner for every foot of griddle surface.. The other is that each burner is electronically monitored for temperature control.. As a result, at 30,000 BTU using natural gas, there is excellent energy management and power recovery..

Temperature sensors are embedded in the griddle plate.. Each sensor is close to the plate surface where the load is.. The effect of this arrangement is to achieve an even temperature gradient across the plate.. Thanks to the electronic monitoring feature, a much faster response to changes in surface temperature is achievable in the chain griddle than in previous units..

The smoother temperature gradient per unit surface area and accurate temperature control has made the chain griddle an instant success.. This simple explanation of the two main features of the unit is what makes it so special.. Without fast response and a smooth gradient, the chain griddle would be just another design among many..

Explaining why the unit is special is one thing and understanding how it works in another.. Service technicians need to know this to have complete confidence when servicing the unit.. We describe how it works in the next part of this section..

Figure 1 -Front view of counter-top chain griddle

Burner ON amber
indicator light				Air vents
Securing	Pilot ON green	Flame
fasteners		viewport
for removable	indicator light		Zone		Removable top
top		thermostat			access panel
access panel
Main power					Hinged
ON
					drop-down
green
					bottom half
indicator
					access
light
					panel
Main power	Zone power				Leg of counter-top
switch	switch
			Grease tray		style griddle

How Does it work?

When the main power switch is turned on, the power indicating lamp is illuminated and power is applied to the thermostat input of the ignition modules.. This will initiate the pilot ignition sequence.. The ignition module supplies a spark ignition at the pilot burner and will energize the pilot solenoid valve for a maximum trail period of 50 seconds..

If the pilot flame ignites and is sensed within the 50 second period, the main burner output of the ignition module will be energized.. The pilot indicating lamp will illuminate.. The main burner solenoid valves are then controlled by the thermostats.. As a thermostat calls for heat, it will energize its output and the main burner valve along with the burner indicating lamp will energize.. The main burner will cycle with the thermostat..

There is only one trial for ignition.. If the pilot flame is not sensed during the trail period, the ignition module will lock out.. All ignition module outputs will be de-energized.. To reset the ignition module the main power switch must be turned off for a period of 30 seconds..

Part #GCGTRAINING06 (03/03/08) Page