Vulcan-Hart RGT-10 Installation, Service & Parts Manual page 7

GENERAL THEORY OF OPERATION
Figure 1 shows the air flow pattern inside the Vulcan-Hart
Convection Oven. The blower pulls the air from inside the
oven cavity and forces it around toward the left and right
sides. The forced air is then deflected toward the front of
the oven on both sides and finally returns to the inner
section through the perforated side liners on both sides.
The air is thus able to carry the heat from the heat
exchangers located behind the side liner and distribute it
evenly throughout the oven cavity.
The Blower and Solenoid operate independently of each
other. The Blower operates as long as the doors are
closed or the Aux. Fan Switch is actuated. The Solenoid is
controlled by the Thermostat and the Load Control. The
Thermostat must be On and the Load Control set to an
operating position for the Solenoid to come On and supply
heat to the oven. Either the Thermostat or the Load
Control switch in OFF position will shut off the Solenoid.
In order to provide protection against pilot-out hazard, two
normally open flame switches are connected in series with
the Solenoid. The switches close when heated by the
pilots and will remain closed as long as the pilot is
present. In the absence of pilot heat, the switches open,
thereby de-energizing the solenoid valves. A snap-action
door switch, mechanically linked with the right hand door,
shuts off both the heat and the blower when the door is
opened and will automatically reset when the door is
closed.
5
In ovens equipped with optional Aux. Fan Switch, the
above mentioned door interlock can be over-ridden by
depressing the "Aux. Fan" push button switch. The over-
ride affects the blower only (not the heat) and is intended
for rapid cooling of the oven interior. Under "Component
Description and Replacement" section in the Operating
Manual the detailed function of each component is
explained.
(SECTION II)