Huawei NetCol8000-E220 User Manual page 171

NetCol8000-E220 Modular Indirect Evaporative Cooling
System
User Manual
Context
Components and working principle: The scroll compressor is composed of the air intake and
exhaust angle valves, oil pump, motor, and electric heating belt. Air is sucked from the
outside and exhausted from the position in the center. A variable-frequency scroll compressor
uses a frequency converter, and generates different air volumes as the frequency changes,
thereby increasing or reducing the cooling and heating capacity. When the compressor
operates at a high speed, it generates a large heating or cooling capacity, which enables the
room temperature to quickly reach the preset temperature. When the room temperature
decreases to a value close to the preset temperature, the compressor frequency automatically
decreases to a certain level to meet the heating or cooling capacity requirements and maintain
the room temperature at a stable level.
Reclaim or dispose of the refrigerant in accordance with local laws and regulations. Do not
discharge the refrigerant to the atmosphere.
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Procedure
Step 1 On the controller home screen, tap Shutdown, and turn off the device switch in the PDC.
Exercise caution because the device is still energized after it is shut down on the controller
home screen.
Step 2 Open the no.2nd maintenance door.
Step 3 Reclaim the refrigerant.
Step 4 Remove the electric heating belt and compressor ground cable.
Step 5 Remove the cover of the connection box and disconnect the compressor power cables.
Step 6 Removing the electric heating belt and compressor power cables
Step 7 Remove the compressor.
1.
Issue 02 (2019-10-10)
Do not tilt the compressor during replacement to prevent lubricant leakage.
When replacing a compressor, avoid skin contact with the refrigerant or lubricant to
prevent frostbite or burns.
Install a new compressor immediately after you remove the rubber plugs of the suction
inlet and exhaust outlet to prevent the moisture.
Heat the air intake angle valve joints using a heat gun for 10 minutes. Secure the angle
nut and pipe nut on the air intake side, as shown by (1) in Figure Removing a compressor
angle valve, using two 30# adjustable wrenches respectively. Then loosen the adjustable
nut using a 36# adjustable wrench to separate the pipe from the angle valve.
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6 System Operation and Maintenance
163