Vertiv | Liebert® CRV4 | User Manual 97
System Operation and Maintenance
• Air suction superheat has a big impact on the compressor life. If the compressor has operated for a long
period of time when the air suction superheat is small or zero, it may cause the compressor to “liquid
strike” and cause damage to the compressor.
• The customer is not advised to adjust the Electronic Expansion Valve (EEV) on their own. If there is a
need to adjust, please contact Vertiv representative.
8.9.4. Air-cooled Condenser
When the outdoor unit airow is blocked, clean the condenser with compressed air or a n cleaning agent
(weakly alkaline) to remove dust and debris that hinder the airow. When cleaning the ns with compressed air,
the direction of the purge should be reverse to the airow direction. In winter, prevent snow from accumulating
around the condenser. Inspect the ns for rewinding or damage and perform simple repairs if necessary. Check
all refrigeration lines for vibration and reinforce, if necessary. Carefully inspect all refrigeration line accessories
for oil traces to determine the location of the leak.
8.9.5. Compressor
No direct contact between the refrigerant or lubricant and the skin when replacing the compressor, or
serious burning or frostbite may occur. Put on gloves with long sleeves when processing polluted parts.
Liebert® CRV4 air conditioner system uses the highly eective scroll compressor with high eiciency and high
reliability. It is rare for the motor of the compressor to get burned due to short circuit. If in the case, the motor
does get burned, the cause is usually mechanical problem or poor lubrication, in other words, due to over-
temperature.
If the causes that lead to the compressor failure could be discovered and corrected in time, most failures are
avoidable. The maintenance personnel should check the operation situation periodically and take necessary
measures to ensure the system’s operation is normal. This practice is both easy and cost saving, when it is
compared with replacing the compressor upon faults that result from negligence or inadequate maintenance.
• Check electrical part
When diagnosing the compressor, check the operation situation of all the electrical parts of the compressor.
1. Check all the fuses and circuit breakers.
2. Check the operation of high pressure switch, high pressure sensor and low pressure sensor.
3. When the compressor is faulty, nd out the nature of the cause: is it an electrical fault or a mechanical fault?
4. Check related historical information and historical operation records.
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