Water Pump Protection Control - Mitsubishi Electric PURY-M200YNW-A1 Service Handbook

[5-3 HBC Control ]
5-3-10

Water Pump Protection Control

When the circuit is clogged or air enters the water circuit, the protection control starts on the HBC to protect the water pump
and the system is stopped depending on the situation.
(1) When the internal temperature of the water pump increases
When the detection temperature of the water pump outlet pipe is above a certain level, the water pump is stopped to protect
it from the heat.
(2) When the revolutions of the water pump increases
When the revolutions of the water pump is above a certain level (The value changes depending on the specified voltage.),
the water pump is stopped to reduce the risk of air infiltration and water leaks.
(3) When the water pressure on the discharge or suction side of the pump dropped and when the
differential between the discharge and the suction sides of the pump dropped.
When the discharge or suction pressure drops below a certain level, the pump is stopped to reduce the risk of water leakage
resulting from air entrainment.
When the differential between the discharge and suction sides of the pump drops below a certain level, the pump is stopped
to reduce the risk of water leakage resulting from air entrainment.
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- chapter 5 BS_05_M