Solid State Relay (Ssr); Thermocouple - Cook Cavity; Thermocouple - Electrical Compartment (Ec); Thermostat - Cooling Fan - TurboChef High h batch 2 Service Manual

38 THE CONTROL SYSTEM

Solid State Relay (SSR)

Figure 32. The solid state relay is a 240 VAC, dual
40-amp relay. K4 (right) switches power to heater
1. K5 (left) switches power to heater 2. When the
SSR is actuated, the (-) control input will go to
0.00 VDC. When not actuated, the control input
will read -24.00 VDC.
Thermocouple – Cook Cavity
Figure 32. The cook cavity thermocouple is type K
and measures the temperature of the recirculating
impingement airflow. The thermocouple is "open"
(F7 Fault) if the display shows 999 º F/C.
Thermocouple – Electrical Compartment (EC)
Figure 32. The electrical compartment thermocouple
is type K and measures the temperature of the elec-
trical compartment. If the temperature within the
electrical compartment is above 158 º F (70 º C), the
control will display an F6 Fault. It is located on the
40-pin connector.
Thermostat – Cooling Fan
Figure 32. The cooling fan thermostat actuates the
rear cooling fans when the electrical compartment
temperature reaches 120 º F (49 º C).
F i g u re 3 1 : Control System Components - Keypad and Display Housing
Ref # Part Description
1 Cable, Smart-Card, 30 inch
Display with Ribbon Cable,
2
Brackets
3 Keypad, General Market
4 Smart Card Reader
Thermostat – High-Limit
Figure 34. The high limit thermostat is a three-
pole, manual-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
abnormal condition. Reset the high-limit thermo-
stat by pressing the reset button (Figure 34).

Voltage Sensor

Figure 34. 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 49).
3
Part Number Hardware Description
100161 N/A
Screw, #4-40 x 1/4", PPH, SS, Sems, Int Th
HHB-3204
Nut, Keps Hex, #10-32, Cres, Ext Th
HHB-8244 N/A
100506 Screw, #6-32 x 1/4", PPH, SS
1 4
2
Hardware #
N/A
101520 (qty 4)
102963 (qty 2)
N/A
101560 (qty 4)