Market Forge Industries 2500 HE, Service & Parts Manual, Page: 25 / 37

HIGH EFFICIENCY CONVECTION ION OVEN
6.4.4.2 Flame Baffle Assembly Removal
1. Remove burner pan assembly (see subsection 6.
4.4) to access flame baffle assembly (Fig 7-2 26.)
2. Remove two screws (32) from flame baffle fron
t
support clips (31) left and right. Remove clips and
allow flame baffle to tip down into burner cavity.
3. Slide baffle forward and off rear support
channel.
6.4.5 Electrode Removal
1. Remove bottom front louvered panel ( Fig 7-3
#34).
2. Disconnect high voltage lead and low voltage lead
by removing retaining nuts, washers, and
terminals.
3. Remove two retaining screws (Fig 7-2, #12) from
electrode mounting plate Slide out electrode (25).
6.4.6 Gas Valve Removal
1. Remove right side panel (see subsection 6.4.2).
2. Break two unions (Fig 7-2, #35) connecting gas
valve and regulator to manifold. Remove valve
and regulator assembly.
3. Unscrew gas valve from close nipple (34) and
elbow (33).
6.4.7 Thermostat Removal
1. Remove six screws from top panel (Fig 7-1,5) on
right side of oven.
2. Remove four screws from rear panel (7).
3. Remove four screws from control panel (13).
4. Remove right side panel (9).
5. Remove five screws that secure perforated
capillary tube guard to oven liner.
6. Slide thermostat bulb out from clips and through
hole in side of oven.
7. Slide entire assembly out front of oven through the
control area.
8. Install replacement thermostat as required.
6.4.8 Ignition Control Board Removal
To access ignition control board, remove control
panel See subsection 6.4.1.
1. Disconnect high and low voltage electrodes and
wires to reset switch, gas valve, and terminal strip
2. Remove screws, nuts, lockwashers, and spacers
from board. Remove control board.
6.5 ADJUSTMENTS AND OPERATIONAL CHECKS
OF BURNER COMPONENTS
During normal use or when parts are replaced,
certain adjustments must be made to gas burners,
pressure regulator, and electrode assembly.
Procedures are outlined in the following paragraphs.
6.5.1 Gas Burners
The burners and fixed orifices are sized at the
factory for natural gas operation. The burner air
shutters should be adjusted at the proper opening to
produce a blue flame without yellow tipping. To adjust
air shutters, see Fig 6-3 Refer to Fig 6-3 indexes for
correct orifices to be used with certain gases.
6.5.2 Regulator Adjustment
Regulator (Fig 7 2, 2) is factory set at 4" (102mm}
and adjustable from 3 5 6" water column gas pressure
for natural gas, factory set at 10"
{254mm) and
adjustable from 6115" for propane or butane gas.
Check input by attaching manometer to downstream
pressure tapping of manifold (behind front louver, right
side) by removing plug fitting with burners off. To
adjust, proceed as follows.
1. Remove right side panel (see subsection 6.4.2).
2. With the main burner operating, remove pressure
regulator cover screw.
3. Turn the valve adjusting screw (located under the
cover) clockwise to increase, or counter clockwise
to decrease the gas flow. Do not exceed the input
rating on the unit nameplate.
4. To ensure proper adjustment, cycle main burners
on and off several times by means of the
thermostat switch.
6-4 S 2207