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Chapter 7 System Operation And Maintenance
Components
Compressor
Air-cooled condenser (if
used)
Refrigeration system
Heating system
Electric control part
7.3 Self-Diagnosing Functions
Regular system maintenance is vital to ensure the product reliability and validity. The micro-processing controller
provides the function that enables you to turn on/off the components onsite manually so as to check their functionality.
7.4 Electric Control Part
7.4.1 Maintenance Of Electric Part
Carry out visual inspection and handling over the electrical connection by referring to the following items.
1. Conduct electrical insulation on system to find out bad electrical connection and contacts. Disconect all fuses and
MCBs of the control part during the test as high voltage from the insulation test could damage the components.
2. Check the contactors before power-on and make sure the contactors can hold and unhold freely.
3. Clean the electric and control components off 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.
7. If the power cables are damaged, it must be replaced by certified electrician.
7.4.2 Maintenance Of Control System
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 for any burn marks, and test the output voltage
(of the indoor unit & outdoor condensers).
2. Check that there is no signs of aging on the control interface board, control board, temperarure and humidity
sensor board and fuse board.
3. Clean the electric control components and control board off dust and dirt with brush and electronic dust removing
agent.
Check for leakage
Listen to the operation sound, observe the operation vibration
Check and fasten the circuit connections
Check the fins cleanness
The fan base should be firm
The fan vibration absorber is not deteriorated or damaged
The SPD board should be effective (in the storming seasons, the SPD
board should be check once a week)
Check the voltage regulating function of the rotation speed controller
The temperature switch is set at the required position
The refrigerant pipes are properly supported
Check and fasten the circuit connections
Check the suction pressure
Check the discharge pressure
Check the refrigerant pipes
Check the moisture condition in system through the sight glass
Check the re-heater operation
Check the erosion situation of the components
Check and fasten the circuit connection
Check the fuse and the MCB
Check and fasten the circuit connections
Check the control program
Check the contactor action
Liebert.CRV+ Series Air Cooled Precision Air Conditioner User Manual
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