MCAC-PDSM-2013-04 Midea Precision AC Technical Manual-Down Delivery Series
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connector on the card.
6. There is a table of Pin-wiring of the connector stamped on the card.
Pin Significato
meaning
1 GND
2 RX+/TX+
3 RX-/TX-
7. Maintenance
7.1 Electrical maintenance
According to the following items to check appearance of the electrical connections and do the relative
handlings. Before fastening any assembly connections and circuit connections, it must ensure that
the power supply of the control element has been closed.
The electrical insulation test: find out the unqualified contacts and handle them. During the rest
process, pay attention to disconnect the control part of the safety or air switch, to avoid high
voltage damaging the control panel.
Static detect the suction port of each contactor is flexible or not, and whether there is card
resistance.
Use a hairbrush or dry compressed air to clean dust for the electrical and control components.
Check the suction port of the contactor whether has arc discharge and burn mark phenomenon.
When it is serious change the corresponding contactor.
Tighten each electrical connecting terminal.
Check whether the plug-in quick connectors whether contact well, if there is any loose condition
it should be replace the terminal.
7.2 Control maintenance
According to the following items to do the appearance check, simple function test of the electrical
connections and do the relative handlings. Before fastening any assembly connections and circuit
connections, it must ensure that the power supply of the control element has been closed.
Check the appearance of the power transformer and isolated transformer, and detect the output
voltage of indoor unit and outdoor unit.
Detect the surfaces of control connector panel, display panel, sensor panel and safety panel
whether there has obvious ageing.
Clean the dust, dirt on the electric control elements and control panel by hairbrush with the
electronic cleaning agent.
Check and tighten control each input and output plug-in connector of the control connector panel,
including the connection of display panel and control connector panel as well as the connection
of the control connector panel and temperature/humidity sensor panel.
Check the connection of the wiring terminals (J10, 01/45, 01/47, 01/48, etc.) and controller
connector panel.
