OVEN SYSTEMS
29
Relay - K7 Monitor
The K7 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 before the primary
or secondary switches.
Relay - K8 Anode
The K8 relay is a 240 VAC, 30 amp, double-pole,
double-throw, 24 VDC relay coil. It switches power
to the high-voltage transformers.
RTD
The RTD measures the temperature of the heater
element. If the display reads “999°F/C”, the RTD
is open, resulting in an F7 fault. See page 37 for
troubleshooting.
Testing Procedure:
1. Disconnect the RTD from the control harness.
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 :, the RTD is
defective and must be replaced.
NOTE: Use Figure 34 below to determine resis-
tance readings at temperatures other than freezing.
Smart Card Reader
The smart card reader allows the oven operator to
load menus and firmware updates from a smart
card. An oven’s menu can also be saved to a smart
card. For instructions, see page 16.
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.
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.
Voltage Sensor
For North America models only. Voltage selection
is completed at the time of manufacture; however,
if incoming voltage for the store is different than
the preset voltage, the operator will be required to
select either 208 or 240 after turning 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 page 45 for a schematic.
Troubleshooting
The control system could potentially be related to
the cause of any fault (see pages 33-38 for detailed
fault troubleshooting).
The control system might also be related to any
issue diagnosed in the section “Non-Fault Code
Troubleshooting” on pages 39-44.
ºF 0º +20º +40º +60º +80º +100º +120º +140º +160º +180º +200º
0º
90.03 : 97.39 : 101.74 : 106.07 : 110.38 : 114.68 : 118.97 : 123.24 : 127.50 : 131.74 : 135.97 :
+200º
135.97 : 140.18 : 144.38 : 148.57 : 152.74 : 159.90 : 161.04 : 165.17 : 169.29 : 173.39 : 177.47 :
+400º
177.47 : 181.54 : 185.60 : 189.64 : 193.67 : 197.69 : 201.69 : 205.67 : 209.64 : 213.60 : 217.54 :
+600º
217.54 : 221.47 : 225.38 : 229.28 : 233.17 : 237.04 : 240.90 : 244.74 : 248.57 : 252.38 : 256.18 :
ºC 0º +10º +20º +30º +40º +50º +60º +70º +80º +90º +100º
0º
100.00 : 103.90 : 107.79 : 111.67 : 115.54 : 119.40 : 123.24 : 127.07 : 130.89 : 134.70 : 138.50 :
+100º
138.50 : 142.29 : 146.06 : 149.82 : 153.58 : 157.31 : 161.04 : 164.76 : 168.46 : 172.16 : 175.84 :
+200º
175.84 : 175.91 : 183.17 : 186.82 : 190.45 : 194.07 : 197.69 : 201.29 : 204.88 : 208.45 : 212.02 :
+300º
212.02 : 215.57 : 219.12 : 222.65 : 226.17 : 229.67 : 233.17 : 236.65 : 240.13 : 243.59 : 247.04 :
Figure 34: Temperature/Resistance Relationship Class B. Resistance @ 0ºC = 100.0, Alpha = 0.003850
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