Duke FBB-XY-230-AAB, Руководство по обслуживанию

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Service Manual for Flexible Batch Broiler, CE Version
31
6/19/2014 SM-BR-BR-0007
Testing the Transformers
There are two 24-Volt Step-Down Transformers
in the broiler. One supplies power to the Control
Board, the other provides power to the Ignition
Modules. Either a voltage or a resistance check
can be used to test the Transformers.
Voltage Test
1. Make sure the broiler is turned off.
2. Remove the Lower Control Side Service Panel.
Refer to the COVERS and PANELS section
of the manual.
3. Disconnect the secondary winding.
4. Turn the broiler on.
5. Using a VOM, test the voltage output across
the secondary winding. Voltage should be
24VAC.
Resistance Check
WARNING
DIsCONNECT THE ELECTRICAL
POWER TO THE BROILER AND
FOLLOW LOCKOUT / TAGOUT
PROCEDUREs.
1. Turn the broiler off.
2. Remove the Lower Control Side Service Panel.
Refer to the COVERS and PANELS section
of the manual.
3. Tag and disconnect the wires of the Transformer
to be tested.
4. Measure the resistance across the primary.
Primary Resistance = 70 Ω .
5. Measure resistance across secondary.
6. Secondary Resistance = 1
Ω .
Lower Ignition Module Testing
When the Cook Chamber Temperature Probe
calls for heat, the Control Board will send 24VAC
to terminals TH and GND on the Lower Ignition
Module. The Lower Ignition Module first performs
a diagnostic check. After the diagnostic, the Lower
Ignition Module is activated.
• 24VAC is applied across terminal V1 opening
the Lower Combo Gas Valve.
• High voltage spark is generated at terminal HV.
• When the Flame Sensor detects a current
flow of not less than 0.7uA, the Igniter stops
sparking.
The Lower Ignition Module performs a self-
diagnostic check. It is equipped with an LED that
has three states, indicating the type of diagnostic
failure:
1. Steady On: Indicates internal failure of the
module. The module must be replaced.
2. Two Flashes of the LED: Indicates the burner
is lit but no call for heat exists.
3. Three Flashes of the LED: Indicates ignition
lockout has occurred.
Upper Ignition Module
There are two upper ignition modules which
operate the IR burners and they work in the same
manner as the Lower Ignition Module. The Control
Board will send 24VAC to terminals TH and GND
on the FRONT Upper Ignition Module.
• 24VAC is applied to terminal TH and Ground.
24 VAC is presented between V1 and GND
on the FRONT Upper Ignition Module which is
connected to TH and GND on the REAR Upper
Ignition Module. 24VAC is then presented
across V1 and GND on the REAR Upper
Ignition Module which allows the Upper Gas
Valve to open.
• High voltage spark is generated at each Upper
Igniter, with respect to the FRONT and REAR
Upper Ignition Modules.
• When the Flame Sensors detect a current
flow of not less than 0.7uA, the Igniters stop
sparking.
The Upper Ignition Modules perform a self-
diagnostic.