36
OVEN SYSTEMS AND COMPONENTS
Relays, K1, K2, K3, & K4
The K1, K2, K3, & K4 relays are 240 VAC, 24
VDC coil, 20 amp, sealed single-pole relays.
The K1 and K2 relays control the top (K1) and
bottom (K2) rack motors. The K3 and K4 relays
control the top (K3) and bottom (K4) light assem-
blies.
Relays, Solid State, K5/K6 & K7/K8
The solid state relay is a 240 VAC, dual 40-amp
relay. The K5/K6 controls the top cavity heaters
and the K7/K8 relay controls the bottom cavity
heaters.
Relay, K9
The K9 relay is a 30A double pole, double throw
relays with a 24 VDC coil. The K9 relay is used to
supply the second leg of power to the heaters when
the oven is on.
RTD
One RTD measures the temperature of the top cav-
ity, and another RTD measures the temperature of
the bottom cavity. If the display reads “999°F/C”, at
least one RTD is open, resulting in an F7 fault. See
page 51 for troubleshooting.
Testing Procedure:
1. Disconnect the RTD from the control
harness (see page 41 for schematic).
2. Place the RTD in ice water for two minutes.
3. Take a resistance reading of the RTD.
4. If RTD resistance is not 100 (+/- 2 ), the
RTD is defective and must be replaced.
Thermostat, Cooling Fan
The cooling fan thermostat actuates the rear cool-
ing fans when the electrical compartment
temperature reaches 120
º
F (49
º
C).
Thermostat, High-Limit
The high limit thermostat is a three-pole, man-
ual-reset thermostat with a trip point of 572
º
F
(300
º
C). The thermostat interrupts power to the
main convection heater in the event of an abnor-
mal condition. Reset the high-limit thermostat by
pressing the reset button located on the back of the
oven. There are two high limit thermostats, one for
each cavity.
USB Port
The USB port allows the oven operator to load
menus to and from a USB thumb drive. For instruc-
tions, see page 18. Firmware updates can also be per-
formed via USB; contact the factory for assistance.
Voltage Sensor
For North America oven models, the oven will
detect 208 or 240 incoming voltage.
Initial voltage selection is determined before the
oven is used by the customer. However, if incom-
ing voltage for the store is different than the preset
voltage, the operator must select either 208 or 240
after pressing the On/Off key to turn on the oven.
The correct voltage will be enlarged on the screen,
identifying which option to select.
Wire Harness
The wire harness distributes power to the oven’s
electrical components. (See schematic, page 41).
WiFi Module
The WiFi module is responsible for transferring
data wirelessly between the oven controller and
TurboChef Connect. The oven logs events such
as cook cycles and faults to TurboChef Connect,
and menu updates can be pushed via TurboChef
Connect to one or many ovens simultaneously. The
recommended range from the oven to the router is
60 feet or less.
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