6
Service Procedures
22
© Moffat Ltd, January 2007
Revision 1/
Blue Seal Evolution Series Gas Griddles
4) Disconnect the pilot supply tube and thermo-
couple from the rear of the gas control valve.
5) Disconnect the gas supply pipe, and main
burner supply pipe from the gas control valve.
6) Undo the mounting screws securing the gas
control valve to the mounting bracket.
7) Replace gas valve and reassemble. Ensure
that the gas valve is set up correctly (correct
low fire screw fitted etc).
Note: When reassembling, it is important that
the thermostat phials are correctly located.
These should be pushed fully into the block
on the underside of the griddle plate. A small
hole in the burner box panel indicated the
approximate position of the thermostat phial
block.
Figure 6.2.8c
6.3
Adjustment/ calibration
6.3.1 Thermostat
Calibration
Note: It is recommended that the faulty gas
valve is replaced, rather than recalibrated.
As the thermostat control has special
fasteners, a Torx T20 security tip or
screwdriver is required. These are readily
available from a tool retailer.
1) Place an accurate thermometer or
thermocouple in the centre of the oven.
2) Light burner and set the thermostat knob to
200°C.
3) Wait for the oven temperature to stabilise
(approximately 20 minutes). Oven centre
temperature should be 200°C ± 10°C.
4) Remove the shaft extension (A) by loosening
off grub screw with the appropriate sized
allan key.
5) With the control knob (C) in the off position
and while holding it in, undo the Torx head
screw (B).
6) Pull the control knob (C) straight off taking
care not to rotate it at all while extracting.
Ensure the spring (D) is not lost.
7) Put a mark on the gear (E) for future
reference to rotation of gear.
8) Carefully rotate the gear (E) for adjustment.
One tooth rotation equals a temperature
change of 5ºC.
Anticlockwise to decrease temperature.
9) Replace the knob, ensuring spring is in
position and taking care not to rotate the
knob while inserting, hold fully in.
Figure 6.3.1
A
E
D
C
B
10) Replace Torx head screw and release knob.
11) Test oven temperature, and re-adjust if
required.
12) Push snap cap back into position on knob.
Figure 6.2.8d
