46 Chapter 6 System Operation And Maintenance
Liebert CRV+ Series Air Conditioner User Manual
3. Connect the power cable correctly.
4. Restore the humidity setpoint to the original setting.
6.5 Electrical Heater
If the optional electrical heater is used, it should be maintained periodically. Ensure that no dust or foreign matter
collects on its surface, the heater is fixed reliably and the cable connection is reliable.
The heater elements will heat continuously in normal station. Inspect the heater every six months for its normal
operation.
If heating is effectless when required, the electrical heater needs to be replaced. If the heater needs to be replaced,
please contact the Emerson maintenance personnel.
6.6 Drain System
Inspect water pan periodically for normal operation of the drain pipe. Ensure that no sediment, foreign matter or
leakage exits in the water pan.
6.7 Refrigerating System
Check the refrigerating system components once a month to make sure that the system function is normal and there
are no signs of wearing. Because the failure or damage of components is usually accompanied by corresponding
faults, regular checking is a major means to prevent most system faults. The refrigerant pipes must be supported by
properly set brackets, and be laid away from the wall, floor or anywhere that vibrates. Check the refrigerant pipes
once every six months to make sure that they are not worn out, and the fixing brackets are not loosened.
Each system has a sight glass to facilitate the observation of refrigerant flow and the system moisture content. When
the system moisture content is too high, the sight glass turns from green to yellow. When there are too many bubbles
in the sight glass, the refrigerant charging amount may be not enough.
When the refrigerating system is faulty, you can locate the fault by referring to certain parameters of system
operation.
6.7.1 Suction Pressure
The compressor may stop when the suction pressure drops below the setting of the low-pressure switch. On the
other hand, too high suction pressure will undermine the cooling effect the refrigerant does to the compressor motor,
leading to the damage of the compressor. The minimum (pressure switch action point) and the maximum (allowed by
the system operation) suction pressure are listed in Table 6-1.
Table 6-1 Suction pressure
System Min. pressure bar, R410A Max. pressure bar, R410A
Air-cooled rotating speed varying system 4.5 11
6.7.2 Discharge Pressure
The discharge pressure may change with the load or the condenser efficiency. When the discharge pressure rises to
the set point of the pressure switch, the high pressure switch will act to stop the compressor. See Table 6-2 for
details.
Table 6-2 Discharge pressure
System design kPa (PSIG)
High pressure switch action point 3700
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