Chapter 7 System Operation And Maintenance; System Diagnosis Test; Self-Diagnosis Function; Electric Control Part - Emerson Chilled Water Series User Manual

Chilled water air conditioner
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Chapter 7 System Operation And Maintenance

Chapter 7 System Operation And Maintenance

7.1 System Diagnosis Test

7.1.1 Self-diagnosis Function

As limited by the environmental conditions, certain components may remain idle for a long time, and there is
no telling of whether they are faulty. However, upon urgent needs, such components may fail to meet the
demand. Therefore it is necessary to check the system components regularly. The controller provides the
function that enables you to turn on/off the components on site manually so as to check their functionality.
For the operation instruction, see 5.7.5 DIAGNOSTICS.
Note
1. During the operation of the chilled water series cooling system, lethal voltage may be present in the internal parts. 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 and repairing personnel can operate and process the system.

7.1.2 Electric Control Part

Electric maintenance
Carry out visual inspection and handling over the electrical connection by referring to the following items.
1. 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. Carry out detection over the contactors before the power-on, make sure the contactors can act freely
without obstruction.
3. Clean the electric and control components 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.
Control maintenance
Carry out visual inspection, simple function test and handling over the control parts by referring to the
following items.
1. Visually inspect the power transformers and isolation transformers and test the output voltage.
2. Check that there are no signs of aging on the control interface board, display control board, sensor board
and fuse board.
3. Clean the electric control components 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 wiring terminals (37, 38) and the control interface board.
6. Check the output connection between the control interface board and the contactors, and the input
connection between the control interface board and various components, including fan overload protector,
heating over-temperature protection switch, humidifier dry-burn protection switch, humidifier top protection
switch,filter clogging switch, fan air-flow safety switch and water flow control valve .
7. Replace the electric components that are detected faulty, such as faulty control fuses (or MCBs) and
control boards.
Liebert.PEX Chilled Water Series Air Conditioner User Manual

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