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9 - MAJOR SYSTEM COMPONENTS AND OPERATION DATA
9.1 - Compressor
- 30XW-VZE/30XWHVZE units use 06T geared twin-screw
compressors equipped with a variable capacity slide valve
and controlled by a speed variator.
- Compressor capacity control is ensured by successive use
of speed variation (using a frequency variator) and swept
volume variation at the screws (using the slide valve).
- The combination of these two control modes permits fine
control of the unit capacity between 20% and 100%.
- The 06T compressor models used are: 06TUX483,
06TUX554, 06TVX680, 06TVX753
9.2 - Oil filter
The 06T screw compressor has an independent oil filter.
9.3 - Refrigerant
The unit is a liquid chiller operating with refrigerant R1234ze(E)
(standard) or R515B (option 330).
9.4 - Lubricant
The 06T screw compressor is approved for use with the following
lubricant: CARRIER MATERIAL SPEC PP 47-38.
9.5 - Oil supply solenoid valve
An oil supply solenoid valve is installed on the oil return line as
standard to isolate the compressor from oil flow when the
compressor is not operating. The oil solenoid valve is field
replaceable.
9.6 - Pressure vessels
General
Monitoring during operation, re-qualification, re-testing and re-
testing dispensation:
- Follow the regulations on monitoring pressurised equipment.
- It is normally required that the user or operator sets up and
maintains a monitoring and maintenance file.
- If no regulations exist or to complement regulations, follow
the control programs of EN 378.
- If they exist follow local professional recommendations.
- Regularly inspect the condition of the coating (paint) to detect
blistering resulting from corrosion. To do this, check a non-
insulated section of the container or the rust formation at the
insulation joints.
- Regularly check for possible presence of impurities (e.g. silica
grains) in the heat exchange fluids. These impurities maybe the
cause of the wear or corrosion by puncture.
- Filter the heat exchange fluid. Check and carry out internal
inspections as described in EN 378, annex C.
- In case of re-testing please refer to the maximum operating
pressure given on the unit nameplate.
- The reports of periodical checks by the user or operator must
be included in the supervision and maintenance file.
- Filter the coolant and carry out internal inspections as
described in EN 378.
- In case of re-testing please refer to the maximum operating
pressure given on the unit nameplate.
- The reports of periodical checks by the user or operator must
be included in the supervision and maintenance file.
Repair
Any repair or modification, including the replacement of moving
parts:
- must follow local regulations and be made by qualified
operators and in accordance with qualified procedures,
including changing the heat exchanger tubes.
- must be made in accordance with the instructions of the
original manufacturer. Repair and modification that
necessitate permanent assembly (soldering, welding,
expanding etc.) must be made using the correct procedures
and by qualified operators.
- An indication of any modification or repair must be shown in
the monitoring and maintenance file.
Recycling
The unit is wholly or partly recyclable. After use it contains
refrigerant vapours and oil residue. It is coated by paint.
Operating life
The evaporator and oil separator are designed for:
- prolonged storage of 15 years under nitrogen charge with a
temperature difference of 20K per day.
- 452000 cycles (start-ups) with a maximum difference of 6 K
between two neighbouring points in the vessel, based on 6
start-ups per hour over 15 years at a usage rate of 57%.
Corrosion allowances
Gas side: 0 mm
Heat exchange fluid side: 1 mm for tubular plates in lightly alloyed
steels, 0 mm for stainless steel plates or plates with copper-nickel
or stainless steel protection.
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