TurboChef i3 Service Manual

OVEN SYSTEMS
33
Relay - K7 Magnetron Cooling Fan
The K7 relay is a 240 VAC, 24 VDC coil, 20-amp,
sealed single-pole relay. It switches power to the mag-
netron cooling fan when the magnetron filaments are
actuated. The control board switches off power after 4
minutes, 15 seconds.
NOTE: The 4:15 timer starts over each time the
magnetron filaments are actuated.
Relay - K8 Stirrer Motor
The K8 relay is 240 VAC, 24 VDC coil, 20-amp,
sealed single-pole. It switches power to the stirrer.
RTD
The RTD is a resistance temperature detector used to
detect the cavity temperature. If the display reads
“999°F/C”, the RTD is open, resulting in an F7 fault.
See page 41 for troubleshooting.
Testing Procedure
1. Disconnect power from the oven.
2. Open the top cover of the oven, ensuring the
supports are in place.
3. Disconnect the RTD from the control board.
4. Place the RTD in ice water for two minutes.
5. Take a resistance reading of the RTD.
6. If RTD resistance is not 100 W, RTD is
defective and must be replaced.
NOTE: Use Figure 37 below to determine resistance
readings at temperatures other than freezing.
Smart Card Reader
The smart card reader allows the oven operator to load
menu or firmware updates from a smart card. An
oven’s menu can also be saved to a smart card. For
instructions, see page 15.
Solid State Relay - K4/K5 Heater
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.
Speaker
The speaker provides audible feedback to the oven
operator whenever a key is pressed or a task (such
as a cook cycle) is completed.
USB Port
The USB port allows the oven operator to load menu
or firmware updates from a USB drive. An oven’s
menu can also be saved to a USB drive. For
instructions, see page 15.
Wire Harness
The wire harness distributes power to the oven’s
electrical components. See page 49 for the schematic.
ºF 0º +20º +40º +60º +80º +100º +120º +140º +160º +180º +200º
0º
90.03W 97.39W 101.74W 106.07W 110.38W 114.68W 118.97W 123.24W 127.50W 131.74W 135.97W
+200º
135.97W 140.18W 144.38W 148.57W 152.74W 159.90W 161.04W 165.17W 169.29W 173.39W 177.47W
+400º
177.47W 181.54W 185.60W 189.64W 193.67W 197.69W 201.69W 205.67W 209.64W 213.60W 217.54W
+600º
217.54W 221.47W 225.38W 229.28W 233.17W 237.04W 240.90W 244.74W 248.57W 252.38W 256.18W
ºC 0º +10º +20º +30º +40º +50º +60º +70º +80º +90º +100º
0º
100.00W 103.90W 107.79W 111.67W 115.54W 119.40W 123.24W 127.07W 130.89W 134.70W 138.50W
+100º
138.50W 142.29W 146.06W 149.82W 153.58W 157.31W 161.04W 164.76W 168.46W 172.16W 175.84W
+200º
175.84W 175.91W 183.17W 186.82W 190.45W 194.07W 197.69W 201.29W 204.88W 208.45W 212.02W
+300º
212.02W 215.57W 219.12W 222.65W 226.17W 229.67W 233.17W 236.65W 240.13W 243.59W 247.04W
Figure 37: Temperature/Resistance Relationship Class B. Resistance @ 0ºC = 100.0, Alpha = 0.003850

TurboChef i3 Specifications

General

Model	i3
Cooking Chamber	Stainless Steel
Cavity Dimensions	14.5 x 16 x 10 inches
Power Requirements	208-240V, 30A
Control Type	Touchscreen