Monitor MWH180EX, Руководство по обслуживанию

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2. Water flow sensor
* Measures the water flow as its rotor (bladed wheel) spins with the passing water. The
rotation of the rotor is detected by the sensor rotor (blade equipped with a magnet) of
the wheel and the Hall element which calculates the water quantity.
3. Water flow control device
* When water flows more than water
heater capacity, hot water temperature
becomes lower than the setting. The
water flow control device automatically
reduces the water flow to prevent such
temperature drops. If the water flow is
greater than the heater capacity, a
signal from the PCB activates the water
flow control device's motor (stepping
motor). In response to this operation,
the valve body of the water flow control
device also is operated to reduce the
water flow by narrowing the water path.
Water flow fluctuations are detected and
transmitted to the PCB by the water flow
sensor. When the appropriate level of
water flow is achieved, the PCB signals
the motor to stop. Thus, the water flow
remains at this level.
ø30
ø30
50
150
°
20
Main body
Rotor
Hall element IC
Sealant
Inlet
5 0
ø 3 0
28.5
29.5
35
Wa t e r f l ow
c o n t r o l d ev i c e m o t o r
Va l ve b o d y
Va l ve m a i n b o d y