TurboChef 2020 Service Manual

22 OVEN SYSTEMS
Testing Procedure
1. Disconnect line voltage to the unit.
2.
Take a resistance reading of the coil.
3. If coil resistance is correct (585
W):
a) Apply line voltage to the unit.
b) Check for 24 VDC at the coil of the
relay when the unit is calling for heat.
c) Check the state of the contacts.
-If the normally open contacts (7 & 4
-or C & NO) are closed when coil
-
v
oltage is applied, the relay is
-
functioning normally
.
-I
f the normally open contacts (7 & 4
-
or C & NO ar
e not closed when coil
-
v
oltage is applied, the r
elay must be
r
eplaced (page A-7 and A-8).
4. If the coil resistance is incorrect, replace the
relay.
Relay, Solid State - K5/K4 Heaters
The solid state relay is a 240 VAC, dual 40-amp
relay, and switches power to the heaters.
RTD
The RTD is a resistance temperature detector
used to detect the cavity temperature.
Testing Procedure
1. Disconnect the RTD from the I/O control
boar
d.
2.
Place the RTD in a bowl of ice water for 2
minutes.
3.
T
ake a resistance reading of the RTD.
4. If RTD resistance is not 100
W, RTD is
defective and must be replaced.
NOTE: Use Figure 32 to determine resistance
r
eadings at temperatures other than freezing.
Smart Card Reader
The smar
t card reader allows the oven operator
to load a menu/firmware update from a smart
card. A menu that already exists in the oven can
also be saved to a smart card. For instructions,
see page 15.
Speaker
The speaker is separate from the control board,
and provides audible feedback to the oven oper-
ator whenever a key is pressed or a fault occurs.
Thermostats - 120ºF (Close on Rise)
The cooling fan thermostats actuate the cooling
fans when the temperature in either end bell
reaches or exceeds 120ºF (49ºC).
Wire Harness
The wire harness distributes power to the oven’s
electrical components. S
ee pages 37-40 for
schematics.
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 32: Temperature/Resistance Relationship Class B. Resistance @ 0ºC = 100.0, Alpha = 0.003850

TurboChef 2020 Specifications

General

Brand	TurboChef
Model	2020
Category	Oven
Language	English