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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
9.6.1 - 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 programmes 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. silicon grains) in the heat exchange fluids. These
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, annexe 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.
9.6.2 - 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
proce-dures and by qualified operators.
•
An indication of any modification or repair must be
shown in the monitoring and maintenance file.
9.6.3 - Recycling
The unit is wholly or partly recyclable. After use it contains
refrigerant vapours and oil residue. It is coated by paint.
9.6.4 - Operating life
The evaporator and oil separator are designed for:
•
prolonged storage of 15 years under nitrogen charge
with a temperature difference of 20 K 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%.
9.6.5 - 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.
8 - HEAT PUMPS 30XWHV
8.1 - Physical data for heat pumps
The physical data for 30XWHV for heat pumps are the
same as for the 30XW-V units. Please refer to chapter 4.1.
8.2 - Electrical data for heat pumps
The electrical data for 30XWHV for heat pumps are the
same as for the 30XW-V units. Please refer to chapter 4.2.
8.3 - Dimensions and clearances
for heat pumps
The dimensions and clearances are the same as for the
30XW-V
units. Please refer to chapter 3.
8.4 - Operating range for heat pumps
The operating limits are the same as for the 30XW-V
units.
Please refer to chapter 6.1.
8.5 - Operating modes for heat pumps
8.5.1 - Cooling mode
This operating mode is the same as that for 30XW-V units.
The unit controls on the cooling setpoint.
8.5.2 - Heating mode
Unlike in the cooling mode, the unit uses the heating
setpoint in this configuration. The evaporator leaving water
control (lowest setpoint taken into consideration) is still
maintained to prevent operation at very low temperatures.
9 - MAJOR SYSTEM COMPONENTS AND OPERATION
DATA
9.1 - Compressors
•
30XW-V/30XWHV 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
30XW-V/30XWHV units only use refrigerant R-134a.
9.4 - Lubricant
The 06T screw compressor is approved for use with lubricants:
•
Castrol Icematic SW220 (Carrier specification PP47-32)
•
Lubrizol Emkarate RL220H (Carrier specification
PP47-13)
