Convection System - Speedcook Oven; Blower Motor (Bottom); Blower Motor (Top); Blower Motor Controller (Bmsc) - TurboChef Residential Single and Double Wall Oven Service Manual

Convection System -
Speedcook Oven
Th e Speedcook oven convection system is designed
to rapidly heat, clean, and recirculate air into the
cook cavity. Th is section contains information about
the following components:

- Blower motor (bottom)

- Blower motor (top)

- Blower motor controller (BMSC)

- Heater assembly

- Jetplate (bottom)

- Jetplate (top)

- Stirrer motor and assembly

For information on accessing and removing parts,
and for part numbers, see the Appendix.
Blower Motor (Bottom)
Th e bottom blower motor runs on varied 3-phase
power to force the air into the upper oven cavity.
Th e motor is controlled by a proprietary controller.
Th e bottom blower motor can be tested in installer
setup mode (see page 4.4).
Blower Motor (Top)
Th e top blower motor runs on varied 3-phase power
to force the air into the upper oven cavity. Th e
motor is controlled by a proprietary controller.
Th e top blower motor can be tested in installer
setup mode (see page 4.4).
Blower Motor Controller (BMSC)
Th e blower motor controller is proprietary and will
only operate the convection motors described above.
Th e motor controller is controlled on command
from the control board and a 0-10VDC speed
command from the control board.
Th e blower motor controller can be tested in
installer setup mode by testing the blower motors
(see page 4.4). For additional troubleshooting, see
page 6.3.
Heater Assembly
Th e Speedcook oven heater assembly consists of
three elements. Th e elements are voltage specifi c and
cannot operate properly without the correct
voltage applied. Confi rm incoming voltage matches
the oven's specifi cations. During preheat, all three
elements are energized.
Th e K1 solid state relay (see page 5.12) controls L1
voltage to the two primary elements while the K8
relay (see page 5.10) controls L1 voltage to the
preheat element. Th e K9 relay (see page 5.11)
controls L2 voltage to all three elements.
NOTE: For 208 volt units, preheat amperage is
at 30.8 amps and once the temperature has been
reached, the operating amperage is at 20.5 amps.
NOTE: For 240 volt units, preheat amperage is
at 28.8 amps and once the temperature has been
reached, the operating amperage is at 19.2 amps.
Jetplate (Bottom)
Th e bottom jetplate channels air that is generated
from the bottom blower motor.
Jetplate (Top)
Th e top jetplate channels air that is generated from
the top blower motor. Th is air passes through a
stirrer before entering the cook cavity through the
jetplate holes.
CAUTION: Th e top jetplate is ceramic and
may crack or break if mishandled. Be careful when
removing or reinstalling it.
Stirrer Motor and Assembly
Th e stirrer is responsible for evenly distributing hot
air and microwaves that are launched from the top
of the oven into the cook cavity. Th e stirrer is driven
by a motor that remains on during a cook cycle.
When the oven is cooling down, the stirrer motor
turns off when the cook cavity temperature recedes
below 160°F (71°C).
To visually test stirrer motor operation, go to Bake,
which will automatically turn on the stirrer, the stir-
rer is visible through the upper jetplate holes.
5.1