Bitzer 2MTE-4K - 4 Mounting; Vibration Damper; Shut-Off Valves; Weld Connections

KB-130-6 19
ter system and in low temperature applications requires
individual consultation with BITZER.
The use of the 2MTE-4K..6CTE-50K compressors
with motor version 1 as parallel compressors is pos-
sible. However, with regard to the lubrication condi-
tions, the gas suction superheat should not fall below a
minimum value of 10 K. The partial load range or the
switching to the operation with flash gas bypass is of
particular importance for the evaluation of the lubrica-
tion conditions. If necessary, a heat exchanger should
be used to minimise the refrigerant concentration in the
oil. Consultation with BITZER is recommended.
The use of compressors with motor version2 as paral-
lel compressors requires individual consultation with
BITZER.
Filter drier
The solubility of water in gaseous CO
2
is much lower
than in other refrigerants. This means that a relatively
small amount of moisture can freeze out of the refriger-
ant and block or clog the regulation valves, particularly
in low temperature applications. Therefore a gener-
ously sized filter drier and a sight glass with moisture
indicator for CO
2
are necessary. Observe the maximum
operating pressures of the filter driers! The application
may possibly be limited to the liquid line after the inter-
mediate pressure receiver or the suction side (for sys-
tems without intermediate pressure receiver).
4 Mounting
4.1 Vibration damper
The compressor may be rigidly mounted if there is no
danger of fatigue fractures in the pipeline system con-
nected to it. Otherwise the compressor must be moun-
ted on vibration dampers.
Mounting the suction gas and discharge gas lines:
• Mount compressor on the vibration dampers or ri-
gidly. In this position (= operational position), con-
nect the suction gas and discharge gas lines and
make sure that they are stress-free. For a selection
of the vibration dampers see table 2, page 19.
Compressor Kit number, article number (4pieces) Hardness
2MTE-4K .. 2KTE-7K 370 005 02 60 Shore
4PTC-6K .. 4KTC-10K 370 005 02 60 Shore
4JTC-10K .. 4CTC-30K 370 005 03 55 Shore
6FTE-35K .. 6CTE-50K 370 005 03 55 Shore
4PTC-7.F3K .. 4KTC-10.F4K 370 000 20 55 Shore
Tab.2: Vibration dampers 2MTE-4K .. 6CTE-50K and 4PTC-7.F3K .. 4KTC-10.F4K
4.2 Shut-off valves / weld connections
Compressor Shut-off valve article no. Designation Inside diameter
d
i
Outside dia-
meter d
a
2MTE..2KTE
4PTC..4KTC
36136718 "Brazed/welded connection"
Ø19..25.4
19mm 25.4mm
36136719 Swagelok valve 18mm 18mm Swagelok
4JTC..4CTC 36136720 "Brazed/welded connection"
Ø10.1..14
10.1mm 14mm
36136721 "Brazed/welded connection"
Ø16.1..22
16.1mm 22mm
36136723 "Brazed/welded connection"
Ø22.4..30
22.4mm 30mm
6FTE..6CTE 36136722 Swagelok valve 28mm 28mm Swagelok