MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual
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4 Fault analysis and solutions
4.1 Abnormal phenomena
Table 3-4.1: No distribution to malfunctions
White aerosol or globule is given out. Or make
sound of ‘hiss’ every now and then.
When the unit is defrosting, the sound of the 4-way valve being shifted. Air
supply motor stop automatically to defrost.
At the beginning and the end of the defrost process, sound is given out in
motor valve occur.
During the process or just after have stopped, sound likes water flow occurs,
which will be amplified at the first 2~3 minutes, this is caused by process of
refrigerant current or water discharge at dehumidifying operation.
Slight ‘hiss’ is caused by heat exchanger as temperature changes. The sound
gives out, because of heat expands and cold contracts of heat exchanger.
During the beginning or just after have stopped, sound likes clock occur,
which is caused by electric expanding valve operation.
Water outlet temperature fluctuation.
Because of different water inlet pressure, under special working condition
that may show up water outlet temperature fluctuation, which is a normal
phenomenon, and will not affect the actual use; appropriately adjust the
water pressure can improve this phenomenon.
Water outlet temperature cannot reach the
setting temperature.
Under low temperature condition, for the purpose of protecting the unit, the
water outlet temperature may not reach the higher setting temperature,
which is a normal phenomenon.
The terminal circulating water temperature lower
than the setting temperature
For purpose of protecting the unit, the terminal circulating water
temperature cannot reach 60ºC, which is a phenomenon, and will not affect
the actual use.
Re-start after the unit stop, after 3 minutes then
can be operated
Compressor delay protection. It is a normal phenomenon.
The fan operates low speed or only operates one
fan
When the ambient temperature is high, for protecting the unit then the fan
will shift to low speed or only operate one fan.
Heat exchanger defrosting.
If operated in winter, for the heat exchanger surface temperature is lower
than the ambient one, and the heat exchanger surface temperature is lower
than 0ºC, the surface will be frosted, which will affect the heat exchanging
effect, so the unit should be periodically defrosting.
During defrosting, the fan will not be operated.
Table 3-4.2: Phenomena need to check again
Stop operation or drive up automatically
Detect the timer whether be given wrong operation.
Detect anti-freezing mode is opened.
Whether the power is cut.
Whether the manual power supply switch is off.
Whether the fuse is broken.
Whether the protection device works. (Operation lamp is lightened.)
Whether it is the time set. (Operation lamp is lightened.)
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