Chapter 1 Overview 3
Liebert CRV+ Series Air Conditioner User Manual
1.5 Main Components Of Indoor Unit
The indoor unit of the Liebert CRV+ series air conditioner consists of DC brushless compressor, evaporator,
electronic expansion valve, electrode humidifier, EC fan, electric heater, sight glass, filter dryer, micro-processing
controller and so on.
Compressor
Adopt a DC brushless scroll compressor. It features low vibration, low noise and high reliability.
Evaporator
Adopt a fin-tube heat exchanger with high efficiency. The distributor is designed and verified according to individual
model to ensure that the refrigerant is distributed evenly in each loop, improving the efficiency of the heat exchanger
to a great extent.
Electronic expansion valve
Adopt an electronic expansion valve. It collects temperature and pressure signals at the same time to accurately
regulate the refrigerant flow.
Fan
Adopt an EC fan. It features high efficiency, energy saving, space saving and low noise.
Electric heater
Adopt a PTC heater. It features quick heating, even quantity of heat, operation safety and reliability.
Sight glass
The sight glass is the window of the system cycle, for observing the refrigerant state, mainly the moisture content of
the system. When the moisture content exceeds the standard, the color will be changed.
Filter drier
The filter drier can effectively eliminate the moisture in the system and filtrate the impurities generated during
long-term system operation so as to ensure the normal system operation.
Micro-processing controller
The Liebert CRV+ series air conditioner uses EMERSON micro-processing controller which adopts advanced PID
regulating technology. The micro-processing controller adopts the LCD screen with blue backlight (small board: white
backlight; large board: blue backlight) and 240 × 128 dots (small board: 128 × 44; large board: 240 × 128). The user
interface operation is simple. The multi-level password protection can effectively prevent illegal operation. It also
provides power failure auto-restoration function and high/low voltage protection function. The operation time of
components is available through the menus. The expert-level fault diagnosis system can automatically display the
current fault information, facilitating the maintenance. It can store up to 200 historical event records. An RS485 port is
configured, and Modbus protocol is used. The panel of the micro-processing controller is shown in Figure 1-3.
Run indicator Alarm indicator ESC button
Enter button
On/off buttonDisplay panel
Up button
Down button
Figure 1-3 Panel of micro-processing controller
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