84 Chapter 7 System Operation And Maintenance
Chapter 7 System Operation And Maintenance
This chapter introduces the operation and maintenance of the Liebert.PEX series air conditioner.
7.1 System Diagnosing Test
7.1.1 Self-diagnosis Function
Regular system maintenance is vital to ensure product reliability and availabilities.
The iCOM controller features a diagnostic function that enables you to turn on/off the components in site manually so
as to check their functionality. For the operation instruction, see
Warning
1. During the operation of the Liebert.PEX air conditioner system, lethal voltage may be present in the internal components. It is
a must to obey all the notes and warnings marked on the equipment or contained in this manual, otherwise injury or fatality may
occur.
2. Only qualified maintenance personnel can operate and handle the components.
7.1.2 Electric Control Part
Maintenance of electric part
Carry out visual inspection and handle the electric connection by referring to the following items.
1. Conduct overall electrical insulation test: find out the unqualified contacts and handle them. Note to disconnect the
fuses or MCBs of the control part during the test lest the high voltage should damage the control components.
2. Check the contactors before power-on and make sure the contactors can act freely without obstruction.
3. Clean the electric and control elements of dust with brush or dry compressed air.
4. Check the closing of contactors for arcs or signs of burning. Replace the contactor if necessary.
5. Fasten all the electric connection terminals.
6. Check that the sockets and plugs are in good condition. Replace those loosened ones.
Maintenance of control part
Carry out visual inspection, simple function test and handle the control parts by referring to the following items.
1. Visually inspect the power transformers and isolation transformers, and test the output voltage (of the indoor unit
and outdoor condenser).
2. Check that there is no signs of aging on the control interface board, display control board, sensor board and fuse
board.
3. Clean the electric control elements and control board of dust and dirt with brush and electronic dust removing agent.
4. Check and fasten the I/O ports at the control interface board, including the connection between display control
board and control interface board, as well as between the temperature/humidity sensor board and the interface board.
5. Check the connection between the user terminals (70#, 71#, 70A#, 71A#, 37#, 38#, 77#, 78#) and the control
interface board.
6. Check the output connection between the control interface board and various components, including various
contactors, solenoid valves for liquid pipes and bypass solenoid valves (liquid bypass), and the input connection
between control interface board and various components, including fan overload protector, high pressure and low
pressure switches, heating over-temperature safties, humidifier safties, filter clogging switch, pressure difference
switch, high/low pressure sensor and chilled water temperature sensor. In particular, check the connection parts such
as HP/LP switches and solenoid valves, and replace the component if in poor connection or faulty.
7. Check and replace electrical components that are faulty, such as control fuses (or MCBs) and control boards.
8. Check the specification and condition of the control cable and power cable between the indoor unit and the
condenser, and replace the cable when necessary.
Liebert.PEX2 Series Air Conditioner User Manual
Содержание Liebert PEX Series
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