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10.4.12 Charging refrigerant
See Section 7.5.11, Page 85
10.4.13 Draining the refrigerant
The refrigerant must be drained:
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The liquid refrigerant can be filled into refrigerant cylinders in liquid form, or suc-
tioned off as refrigerant vapour using an extraction device.
If liquid refrigerant is drained into refrigerant cylinders, special recycling cylinders
must be used for this. This prevents contaminated refrigerant from reuse.
The cylinders into which the refrigerant is filled should be evacuated and cooled
in advance. A sufficient number of cleaned, dry and sub-cooled cylinders must be
made available ready for use before starting to drain the refrigerant. The weight
of the empty refrigerant cylinder must be determined.
The filling line is threaded together with the drain valve and the other end fixed
firmly to the closed refrigerant cylinder. The drain valve is opened slowly. The
valve on the refrigerant cylinder is then also opened slowly. Due to the hazards
involved, you should take care to avoid spilling any refrigerant.
The refrigerant is weighed with a scale, remembering that the cylinder should
only be filled to 80% of the capacity. If this percentage is not reached and there is
still refrigerant in the system, the pressure in the cylinder can be reduced by vent-
ing the cylinder. When the cylinder is filled to 80 %, the refrigerant draw-in valve
and the cylinder valve are closed and the next cylinder is connected. Repeat this
procedure until all of the refrigerant is bottled. Only one cylinder must be filled at
a time.
The quantity of refrigerant filled must be documented in an appropriate log. When
the refrigerant has been filled into cylinders, the charging valve should be closed.
The remnants of refrigerant are suctioned out of the system until it is completely
drained. The pressure must no longer increase after the compressor has been
turned off.
Connections for draining refrigerant
Draining the refrigerant circuit or parts of the circuit can be carried out via the
service valves provided (see P+I diagram).
L_151511_2
19.12.2019
Caution!
Refrigerant may escape.
► Protective clothing must be worn (eye protection and protective gloves).
if the plant is overfilled,
if the refrigerant or oil circuit is dismantled and repaired,
for maintenance work on the oil circuit,
if foreign gases are detected in the plant.
Maintenance
Maintenance work
101
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