Vulcan-Hart ML-126743 Service Manual page 30

VC4E & VC6E Series Full Size Electric Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS
Changing the C_F, InP1, rL1 & rH1
parameters will default all menus to the factory
settings.
1. Use this key sequence to access the setup mode.
Up arrow; Rack 1; Temperature; Temperature;
Down arrow; Rack 1
Fig. 48
2. Once in the setup mode the display will alternate
between the parameter and programmed data.
• To change data to the factory setting, use
the arrow keys.
• To select the next parameter, press the
Rack 1 key.
• After the last Parameter and Data is viewed,
press the Rack 1 key a final time to exit the
setup mode and return to operations mode.
The current set point temperature will be
displayed.
• After 1 minute of no key activations, the
control will return to operation mode.
3. Listed are the parameters and data you should
find.
MENU
Celsius_Fahrenheit
Guard Band
Temperature
Compensation
Input Type 1
Range Low 1
Range Hight 1
Hysteresis
Calibration Offset
Exit Setup Mode and Set point temperature is
returen to Operation displayed or if call for heat,
Mode. dashers(---) displayed.
Probe Test
F25105 Rev. B (0217)
ALTERNATING
ON DISPLAY
PARAMETER DATA
C_F F
gb 4000
tcnP OFF
InP1 J
rL1 75
rH1 500
HYS1 3
CAL1 0
If the oven is not heating or displaying the proper
temperature, the temperature probe may be
malfunctioning. Determine if the probe is good or
causing the operational problem. Temporarily,
disconnect the existing probe lead wires from the
computer control and connect the lead wires from
a known good "J" type thermocouple. Secure the
sensing end of the thermocouple near the probe.
Turn the power switch ON and set the dial to
350°F.
If the oven reaches the set temperature and
cycles with the temporary thermocouple, then the
existing probe is malfunctioning. Replace
temperature probe with the correct part and
check for proper operation.
Solid State Relay Test
The solid state relays "SSR1 or SSR2" supply
power to the blower motor "high" or "low" fan
speed terminals when the SSR is energized by
the output voltage from the computer.
To test solid state relay "SSR1" (high fan speed),
the computer control should be in the "Normal
Cooking Mode". To test solid state relay "SSR2"
(low fan speed), the computer control should be
in the "Roast & Hold Mode".
1. Remove the right side panel as outlined under
COVERS AND PANELS.
2. Turn the power switch ON.
A. If the blower motor comes on, the SSR is
functioning properly.
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Fig. 49