Convection System; Blower Motor (Bottom); Blower Motor (Top); Blower Motor Speed Controller (Bmsc) - TurboChef i3 Service Manual

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)

- Top jetplate insert (not all models)
- Stirrer motor and assembly
For information on accessing and removing parts, see
the Appendix.
Blower Motor (Bottom)
The bottom convection motor is a brushless AC
switch reluctance type. Its top speed is 7100 RPM
at 1 HP. The bottom blower motor is controlled by
a proprietary controller and spins clockwise.
The bottom blower motor can be tested in
(see page 16).
Blower Motor (Top)
The top convection motor is a brushless AC switch
reluctance type. Its top speed is 7100 RPM at 1 HP.
The top blower motor is controlled by a proprietary
controller and spins counterclockwise.
The top blower motor can be tested in
(see page 16).

Blower Motor Speed Controller (BMSC)

The motor controller is proprietary and will only
operate the convection motors described above. It is
controlled via 0-10 VDC speed command from the
control board. The blower motor controller can be
tested in
page 16). For additional F1 fault troubleshooting, see
page 37.

Heater Elements

There are two main convection helical heaters, each
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
page 16).
Jetplate (Bottom)
The bottom jetplate channels air from the bottom
blower motor into the cook cavity.
Jetplate (Top)
The top jetplate channels air from the top blower into
the cook cavity after it passes through a stirrer.
The i3 utilizes two versions of the top jetplate. Ovens
with serial numbers between 00001 and 01000 use a
ceramic top jetplate. All i3 ovens with a serial
TEST MODE
number of 01001 or greater use a stainless top jetplate
that incorporates a glass insert (see below for details).

Top Jetplate Insert

The top jetplate insert is installed only on ovens with
a serial number of 01001 or greater (see page A-3 of
the appendix for an illustration). To replace the insert:
TEST MODE
1. Ensure the cook cavity has cooled; do not attempt
to remove the top jetplate insert until the oven off
screen is displayed.
2. Loosen the two screws that hold the insert in place.
3. Rotate the retainer clips away from the insert.
4. Replace the insert and while holding it in place,
reposition the clips and re-tighten the screws.
by testing the blower motors (see
TEST MODE
CAUTION: Mishandling the ceramic top
jetplate or glass insert can result in breakage.
CAUTION: The top jetplate insert is glass. Be
careful when removing or reinstalling it.
21
(see
TEST MODE