Description - Market Forge Industries 2500 HE Service & Parts Manual

This service and parts manual contains general information, installation, operation, principles of operation, trouble-
shooting, and maintenance information for the Market Forge High Efficiency Gas Convection Oven Also included
are parts lists, in which each replaceable part is identified and shown in an accompanying exploded view

1.1 DESCRIPTION

The Market Forge Model HE Gas Convection
Oven is a gas fired, pilotless, direct-spark-igni-tion
system convection oven The unit is designed to
operate from a natural, propane, or butane gas
supply when equipped with appropriate gas orifices
It consists of a heavily insulated cooking
compartment fitted with a convector fan and heated
by a gas burner system designed to achieve optimal
efficiency from the fuel burned All oven controls are
located on a recessed panel on the right front of the
oven as seen from the front
The major assemblies of the HE oven are the
stainless steel or baked enamel finish cabinet
enclosure, solid doors, stainless steel cooking
compartment with nine shelf supports, convector
fan, pressure regulator and gas valve manifold
assembly, burner box assembly consisting of gas
burners, orifices, and direct spark ignition electrode
The control panel assembly includes the thermostat,
electronic ignition control board, 60-minute and 5-
hour mechanical timers, red indicator light, ON-OFF
power switch, warning buzzer, and ignition and
motor reset switches
The unit is available in a variety of mounting
configurations 7" (178mm) counter stand, 28"
(711mm) modular base, open stand on legs with
shelf and optional storage rack, or stacked on top of
another HE oven with the bottom unit on 6" (152mm)
stainless steel legs
SECTION 1 INTRODUCTION
1.2 BASIC FUNCTIONING
The HE oven becomes operational when the
power switch is placed in the ON position, doors are
closed, and thermostat set Electronic ignition
activates, energizing the burner electrodes and
opening the gas valve (The fan operates continuously
with power on and doors closed, regardless of
thermostat setting ) Gas passes through the regulator
and valve to the burners, where it is ignited by the
sparking of the electrodes The resulting flame heats a
flame baffle plate mounted under the cooking
chamber, which in turn heats the chamber The fan
circulates air uniformly through the chamber When the
chamber reaches the preset temperature, the
thermostat contacts open and the gas valve closes
When the temperature drops enough to close the
contacts, the ignition system reactivates Any number
of such cycles might occur during the cooking time If
for any reason the burners fail to ignite, the system
automatically closes the gas valve Should the burners
go out prematurely, the system will automatically acti-
vate the ignition electrodes, and if flame is not
established the system will shut down and close the
gas valve
1.3 SERVICE
Required service, both preventive and corrective,
is explained in Section 6 Should repairs be required, a
network of authorized agencies is