Mechanical Installation
Vertiv | Liebert CRD10 | User Manual
46
3.9
Recommended Refrigerant and Oil Charging Amount of the
System
WARNING! Risk of over-pressurization of the refrigeration system. Can cause explosive discharge of
high-pressure refrigerant, loss of refrigerant, environmental pollution, equipment damage, injury, or
death. This unit contains fluids and gases under high pressure. Use extreme caution when charging
the refrigerant system. Do not pressurize the system higher than the design pressure marked on the
unit's nameplate.
NOTICE!
Risk of oil contamination with water. Can cause equipment damage.
Liebert® CRV systems require the use of PVE (FV50S) oil. PVE oil absorbs water at a much faster rate
when exposed to air than previously used oils. Because water is the enemy of a reliable refrigeration
system, extreme care must be used when opening systems during installation or service. If water is
absorbed into the PVE oil, it will not be easily removed and will not be removed through the normal
evacuation process. If the oil is too wet, it may require an oil change. PVE oils also have a property
that makes them act as a solvent in a refrigeration system. Maintaining system cleanliness is
extremely important because the oil will tend to bring any foreign matter back to the compressor.
NOTICE!
Risk of improper refrigerant charging. Can cause equipment damage.
Refrigerant charge must be weighed into air-cooled compressorized systems before they are started.
Starting compressors without proper refrigerant charging can cause the compressors to operate at
less than 5°F (
–
15°C) evaporator temperature and at less than 20 psig (138 kPa). Operation for
extended periods at less than 20 psig (138 kPa) can cause premature compressor failure.
The Liebert CRD10 comes with pre-charged 2 bar of Nitrogen in the factory. Discharge the nitrogen before
plugs unsoldering. The users can determine the charging amount of the refrigerant according to the system
configuration and the length of the connection pipes between the indoor and outdoor unit. Table 3-9
represents the recommended refrigerant and oil charging amount of the CRD10 unit.
Table 3-9 Refrigerant and Oil Charging Amount
Model
Base
refrigerant
charging
without
Low
Ambient Kit
(kg/lb)
Base
refrigerant
charging
with
Low
Ambient Kit
(kg/lb)
Base
refrigerant oil
charging with
Low Ambient
Kit
Fluid ounces
(ml/oz)
Additional
Refrigerant oil
charging
(ml/oz)
Total
refrigerant
charging
(kg/lb)
CRD10+CCD100S/CCD101S
4.1/9.0
9.0/19.8
1000/33.8
b
c
The refrigeration oil used in the CRD10 air conditioner is PVE (FV50S). The refilled refrigerant dilutes the PVE
oil in the system and plays a major role in the lubrication and cooling effect of the PVE oil. Therefore, the
refrigerant oil must be extra added for this reason.
