High Limit Thermostat; I/O Control Board (Sage); Magnetron Thermostat; Power Supply - TurboChef Eco Service Manual

High Limit Thermostat

The high limit thermostat is a 250 VAC, 3-pole,
manual-reset thermostat with a trip point of 572ºF
(300ºC). The thermostat interrupts power to the
main convection heater in the event of an abnormal
condition. Reset the high-limit thermostat by
pressing the reset button (Figure 80).
Figure 80: High-Limit Reset Button

I/O Control Board (Sage)

The I/O control board (Sage) controls each
electrical component of the oven. 24 VDC can be
measured at pin 2 of the J7 connector to confirm
control voltage is being applied (see page 63).

Magnetron Thermostat

The magnetron thermostat is "open-on rise." It is
designed to open at 270ºF (132ºC), which triggers
an F5 fault.
NOTE: When open, the control will switch off the
magnetron until the open thermostat closes. The
thermostat is self-resetting.

Power Supply

The power supply outputs 24 VDC at 40 watts to
the control board, relays, speaker, and display/UI
board.

Relay - K1 Stirrer Motor

The K1 relay is a 240 VAC, 24 VDC coil, 20 amp,
sealed single-pole relay. It switches power to the
stirrer motor.

Relay - K2 Anode

The K2 relay is a 240 VAC, 30 amp, double-pole,
double-throw, 24 VDC relay coil. It switches power
Reset Button
to the high-voltage transformer.

Relay - K3 Monitor

The K3 relay is a 240 VAC, 30 amp, double-pole,
double-throw, 24 VDC relay coil. It shorts L1 and
L2 if the monitor switch opens out of sequence
before the primary or secondary switch.

Solid State Relay - K4/K5 Heater

The solid state relay is a 240 VAC, dual 40-amp
relay. K4 switches power to heater one, and K5
switches power to heater two.

Relay - K6 Voltage

The K6 relay is a 240 VAC, 30 amp, three-pole,
double-throw, 24 VDC relay coil. Operational in
North America only, it switches between 208 and
240 VAC on the HV transformer and filament
transformer taps (depending on incoming voltage).
Through the voltage sensor, the oven defaults to the
240V position and switches to 208 if less than 222
volts is detected. 230V/400V international ovens
and all Japan models utilize the N.C. contacts of the
relay to power the microwave transformers.

Relay - K7 Magnetron Cooling Fan

The K2 relay is a 240 VAC, 24 VDC coil, 20 amp,
sealed single-pole relay. It switches power to the
magnetron cooling fan when the magnetron
filament is actuated. Power is switched off after
four minutes and fifteen seconds.
NOTE: The four-minute, fifteen-second timer
starts over each time the magnetron filaments are
actuated.
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