Garland CG-24, Service Manual

Page: 9 / 20

Part #GCGTRAINING06 (03/03/08) Page 9
SERVICING
Many factors affect the serviceability of equipment . In the
chain griddle, there are more components to service than in
older models . The new griddle is a compact design . Access
to the temperature control circuitry and ignition units is
easy . Service techniques for the thermocouple will vary
depending on the model type .
They unit is available with a 6” (15mm) leg which means
that under the griddle plate there is only 6” (15mm) of
working room . To replace a thermocouple it is difficult to
lift the griddle plate, firmly secured to the support frame . To
replace a thermocouple requires bottom access because the
plate is securely fixed (see Figure 3) .
With this introduction to serviceability, and apart from
the features that make the chain griddle superior to more
conventional units, many of the servicing tasks are standard;
the adjustments likewise . The procedures that follow are
a plain guide to servicing, beginning with adjustments to
various components .
Have The Right Tools And Instruments
In addition to a service technician’s normal hand tools, for
servicing this chain griddle we recommend:
1 . A manometer or other suitable instrument for measuring
gas pressure
. A multimeter
3 . A digital read-out temperature meter
A micro-ammeter
CAUTION
: In this chain griddle we use a J-type
thermocouple, which requires a meter with a J-type
connection for checking . Most meters have K-type
connections .
Adjustments
Every griddle is inspected and tested before it leaves the
factory . Adjustments to the unit during installation and
servicing are the responsibility of the field operator and are
not considered to be defects in material or workmanship .
For this reason, adjustments are not covered under the
equipment warranty .
Pilot Flame Adjustment
A pilot adjustment valve is in the line form each pilot
combination valve and access to it is behind the lower front
panel .
1 . To remove the upper front and lower front panels, refer to
the installation procedure given earlier .
. To reduce the volume of gas feed to the pilot, turn the
small screw in the pilot adjusting valve clockwise .
3 . To increase the gas feed to the pilot, turn the same screw
counter-clockwise .
NOTE : Adjust the gas feed to produce a 7/16” (11mm) long
flame to make sure the flame envelopes the top of the flame
sensor .
Burner Air
Make sure a burner is warm before adjusting the air shutters
and follow this procedure .
1 . First, loosen the screw along the side of the burner near
the orifice .
. A burner flame that gets too much air appears to lift
above the burner as though separated from it . This
means the shutter needs throttling back to a more closed
position .
3 . A yellow tip on the flame is a sign that the shutter is
not passing enough air to feed the flame . In this case, it
necessary to open the shutter .
. When the shutter adjustment is complete, tighten the
screw to lock the shutter setting in the adjusted position .
5 . Re-close the upper and lower front panels and replace
the fasteners .
Removing the Griddle Plate
If it is necessary to remove the griddle top, follow this
procedure:
1 . Disconnect the power supply .
. Remove the upper control panel .
3 . Open the lower control panel .
. Disconnect all thermocouple sensors and shield bayonet
adapters . (To reassemble, see the Thermocouple section .)
5 . Remove the griddle top retaining bolts (both left and
right) .
6 . Remove the back flue .
7 . The griddle top is now easily removed .