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OVEN SYSTEMS
23
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.