Vertiv™ | Liebert® SRC-G | User Manual 69
System Operation and Maintenance
6.3. Outdoor Unit Maintenance
6.3.1. Refrigeration System
The components of the refrigerant system should be inspected monthly to find out any abnormal operation
phenomenon. Refrigerant piping must be properly fixed and not allowed to vibrate against wall, floor or the unit
frame. Inspect all refrigerant piping every six months for signs of wear.
6.3.2. Air-cooled Condenser
• When the airflow through the outdoor unit is restricted or blocked, use compressed air or fin cleaner
(alkalescence) to clean the condenser o the dust and debris that reduce airflow.
• The compressed air should be blown at the reversed airflow direction. In winter, do not let snow to accumulate
around the side or underneath the condenser.
• Check for bent or damaged fins and simply repair them if necessary.
• Check all refrigerant pipes and capillaries for vibration and support them if necessary.
• Carefully inspect all refrigerant piping for signs of oil leakage, determine the leakage position and fixed them
immediately.
6.3.3. High-Pressure Switch and Low-Pressure Switch
The discharge and suction pressures will vary greatly with the unit load, ambient condition and used refrigerant,
refer Table 6-1 for details of normal operation. When the discharge pressure rises to the high-pressure setpoint,
the high-pressure switch gets activated and the control system shuts down the compressor after ensuring that
an abnormal input signal of the high-pressure switch is triggered.
When the suction pressure is lower than the low-pressure setting, the low-pressure switch gets activated and the
control system shuts down the cooling system after confirmation.
Table 6-1 Typical Liquid (Discharge) Pressure and Gas (Suction) Pressure
Items psig MPa
Low pressure 100 to 159 0.7 to 1.12
Low-pressure setting 53 0.37
Low-pressure recovery point 80 0.56
High pressure 284 to 526 2.0 to 3.7
High-pressure setting 583 4.1
High-pressure recovery point 469 3.3
To Next Page
Loading...
Need help?
General
