THE CONVECTION CIRCUIT
47
The Convection Circuit provides the high-temperature
airflow required to brown and cook food items.
CONVECTION CIRCUIT COMPONENTS
The following is a description of each component
within the Convection Circuit and how each acts
within the circuit. Figure 37 below shows a block dia-
gram of the Convection Circuit.
Main Convection Heater
The main convection heater is an open-coil style
heater rated at 3300 watts at 208 VAC with a resist-
ance of 13.11 Ohms. The convection heater
is controlled by the K4 solid state relay.
Convection Motor
The convection motor is a brushless AC switch reluc-
tance type. Its top speed is 7100 RPM at 1 HP. The
motor is controlled by a proprietary controller.
Motor Controller (BMSC)
The motor controller is proprietary and will only
operate the convection motor described above. The
motor controller is controlled on command from the
I/O control board and a 0-10VDC speed command
from the I/O control board.
High Limit Thermostat
The high limit thermostat is a 250 VAC, 3-pole,
manual reset thermostat with a trip point of 572
º
F
(300
º
C). The thermostat, which interrupts power to
both the main convection heater and the IR element,
should never operate during normal oven operation.
