KB-130-7
5
The CO
2
purity class can have a higher H
2
O level if the
system is filled using a generously dimensioned filter
drier. It is recommended changing the filter drier sev-
eral times after commissioning.
Standard speed range for capacity control with fre-
quency inverter:
• 2MTE .. 2KTE: authorised for 30 Hz to 75 Hz opera-
tion.
• 4PTC .. 4DTC, 4PTE .. 4DTE, 4PTEU .. 4DTEU: au-
thorised for 25 Hz to 70 Hz operation.
• 4CTC, 4CTE, 4CTEU: authorised for 25 Hz to 65 Hz
operation.
• 6FTE .. 6CTE, 6FTEU .. 6CTEU: authorised for
25 Hz to 70 Hz operation.
• 4PTC-7.F3K .. 4KTC-10.F4K with integrated fre-
quency inverter: authorised for 30 Hz to 87 Hz oper-
ation.
Special applications
The use of the 2MTE .. 6CTE, 4PTC .. 4CTC,
4PTEU .. 6CTEU and 4PTC-7.F3K .. 4KTC-10.F4K
compressors for systems with hot gas defrosting or
heat dissipation to a cold water system and in low tem-
perature applications requires individual consultation
with BITZER.
The use of the 2MTE .. 6CTE, 4PTC .. 4CTC,
4PTEU .. 6CTEU compressors with motor version 1 as
parallel compressors is possible. However, with regard
to the lubrication conditions, 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 lubrication conditions. If necessary, a
heat exchanger should be used to minimise the refri-
gerant 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 dampers
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 5.
Compressor
Kit number, article number (4 pieces)
Hardness
2MTE .. 2KTE
370 005 02
60 Shore
4PTC .. 4KTC
4PTE .. 4KTE
4PTEU .. 4KTEU
370 005 02
60 Shore
4JTC .. 4CTC
4JTE .. 4CTE
4JTEU .. 4CTEU
370 005 03
55 Shore
6FTE .. 6CTE
6FTEU .. 6CTEU
370 005 03
55 Shore
4PTC-7.F3K .. 4KTC-10.F4K
370 000 20
55 Shore
Tab. 2: Vibration dampers 2MTE .. 6CTE, 4PTC .. 4CTC, 4PTEU .. 6CTEU and 4PTC-7.F3K .. 4KTC-10.F4K
