Cang Zhou New High Auto Radiator Manufacturing Co.,Ltd
3.3 The controlling unit
The controlling unit is located at the forefront of the heater and the rear part of
the heat supply fan wheel. It includes the single microprocessor, the driving electrical
circuit, the signal acquisition electrical circuit of the frequency, the rotational speed,
the voltage, temperature monitoring electrical circuit. It retains the characteristics of
automatic heating process, automatic systematic monitoring and automatic fault
processing.
3.3.1 The control of the working process
During the heating process(on-working-off), the heater controls and modulates
the rotational speed, the frequency of the fuel pump and the driving of the electric
plug by chronically corresponding to these parameters: the expected figure and real
figure of the open temperature, the responsive signal of the motor’s rotational speed,
the fuel pump’s frequency, the surface temperature of the heat exchanger.
3.3.2 Malfunction management
When there are phenomena that the heater fails to ignite normally or there is
abnormal combustion or there are the open circuit or short circuit with the electric
plug, the motor, the fuel pump and the sensor, the heater will automatically lurch to
the locking state to protect the heater, which ushers in the imminent conditions that
the electric plug stops working, the motor stops rotating and the indicative lights of
the controlling switch shines).
3.3.3 Fault display
When there is something wrong with the heater, the indicative light(the green
light) will show where the problem is so as to help repair the heater.
During the fault state, the light pipe will shine at different frequencies. The times
of the shining will imply different fault codes. Details are seen as follows:
Check whether the fuel
pump has been connected
with the heater or there
is the open circuit
phenomena or the line
circles have been burned
Check whether the glow
plug has been firmly
inserted in the heater or the
there is the open or short
circuit concerning the
glow plug or whether there
is lots of accumulated
carbon
