Convection System

The convection system is designed to rapidly heat, clean, and recirculate air into the cook cavity.

This section contains information about the following components:

-Blower motor (bottom)

-Blower motor (top)

-Blower motor controller

-Heater element

-Jetplate (bottom)

-Jetplate (top)

-Stirrer motor and assembly

For information on accessing and removing parts, see the Appendix.

Blower Motor (Bottom)

The convection motor is a brushless AC switch reluctance type. Its top speed is 7100 RPM at 1 HP. The motor is controlled by a proprietary controller. The bottom blower spins clockwise.

The bottom blower motor can be tested in TEST MODE (see page 15).

Blower Motor (Top)

The convection motor is a brushless AC switch reluctance type. Its top speed is 7100 RPM at 1 HP. The motor is controlled by a proprietary controller. The top blower spins counterclockwise.

The top blower motor can be tested in TEST MODE (see page 15).

Blower Motor Controller (BMSC)

The motor controller is proprietary and will only operate the convection motors 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.

The blower motor controller can be tested in TEST MODE by testing the blower motors (see page 15). For additional troubleshooting, see page 39.

Heater Element

The main convection heater is a finned-style heater rated at 3000 watts at 208 VAC with a resistance of 14.4 Ohms. The convection heater is controlled by the K4/K5 solid state relay.

The heater element can be tested in TEST MODE (see page 15).

Jetplate (Bottom)

The bottom jetplate channels air that is generated from the bottom blower motor.

Jetplate (Top)

The top jetplate channels air that is generated from the top blower motor. This air passes through a stirrer before entering the cook cavity through the jetplate holes.

CAUTION: The top jetplate is ceramic. Be careful when removing or reinstalling it.

Stirrer Motor and Assembly

The stirrer is responsible for evenly distributing hot air and microwave that are launched from the top of the oven into the cook cavity. The stirrer is driven by a motor that remains on during a cook cycle or when the oven is in TEST MODE. The stirrer motor turns off when the cook cavity temperature recedes below 150°F (66°C).

The stirrer motor can be tested in TEST MODE (see page 15).

CAUTION: Be careful to not allow debris into the waveguides when servicing the stirrer assembly.

OVEN SYSTEMS