Liebert CRV+ Series User Manual

42 Chapter 6 System Operation And Maintenance
Liebert CRV+ Series Air Conditioner User Manual
Chapter 6 System Operation And Maintenance
This chapter expounds the system operation and maintenance of the Liebert CRV+ series air conditioner, including
system self-diagnosing test, and maintenance of filter, fan kit, electrode humidifier, electrical heater, drain system and
refrigerant system.
6.1 System Self-Diagnosing Test
6.1.1 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.
Warning
1. During the operation of the Liebert CRV+ series air conditioner, 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.
6.1.2 Electric Control Part
Maintenance of electric part
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 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 cable is damaged, it must be replaced by professional personnel of manufacturer, its service or similar
department to avoid danger.
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 transformers 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.
4. Check and fasten the I/O ports at the control interface board, including the connection between the control board
and the control interface board, as well as between the temperature and humidity sensor board and the control
interface board.
5. Check the connection between the user terminals (70#, 71#, 37#, 38#) and the control interface board
6. Check the output connection between the control interface board and various components, including various
contactors and solenoid valves for liquid pipes. Check the input connection between control interface board and
various components, including high pressure switches, heating over-temperature protection switch, discharging
temperature sensor and high pressure sensor. In particular, check the inserting terminals such as high pressure

Liebert CRV+ Series Specifications

General

Refrigerant	R410A
Frequency	50/60 Hz
Operating Ambient Temperature	64° to 113°F (18° to 45°C)
Sound Pressure Level	Varies by model (typically 45 dB(A) to 65 dB(A))
Dimensions	Varies by model (consult specific model documentation)
Weight	Varies by model (consult specific model documentation)