Thermostatic Expansion Device; Refrigerant; High-Pressure Switch; High And Low-Pressure Side Safety Valves - Danfoss BW05 Installation, Operation And Maintenance Instructions

The products that may be added for thermal insulation of the
containers during the water piping connection procedure
must be chemically neutral in relation to the materials and
coatings to which they are applied. This is also the case for
the products originally supplied.
NOTES: 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.
• Follow the control programmes of EN 378-2, annexes A,
B, C and D.
• If they exist follow local professional recommenda-
tions.
• 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
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 378-2, annex C.
• In case of re-testing take the possible maximum
pressure difference of 25 bar into consideration.
• The reports of periodical checks by the user or operator
must be included in the supervision and maintenance
file.
Repair
Any repair or modification of the plate heat exchangers is
forbidden.
Only the replacement of the complete heat exchanger by an
original heat exchanger supplied by the manufacturer is
permitted. The replacement must be carried out by a
qualified technician.
• The heat exchanger replacement must be shown on the
monitoring and maintenance file.
Recycling
The plate heat exchanger is 100% recyclable. After use it
contains refrigerant vapours and oil residue.
Operating life
This unit is designed for:
• prolonged storage of 15 years under nitrogen charge with
a temperature difference of 20 K per day.
• 900000 cycles (start-ups) with a maximum difference of 6 K
between two neighbouring points in the container, based
on 12 start-ups per hour over 15 years at a usage rate of
57%.
30

12.4 - Thermostatic expansion device

The expansion devices used are thermostatic hermetic
monobloc devices for sizes BW05 020 to 070 and modular
devices for sizes BW05 080 to 300. They are factory-set to
maintain between 5 and 6 K superheat in all operating
conditions any do not require any change in setting,
including for operation at part load. All models have a charge
(MOP) for the thermostatic assembly that permits the
maximum evaporating pressure to protect the compressor.

12.5 - Refrigerant

BW05 units operate exclusively with R-407C.

12.6 - High-pressure switch

BW05 units are equipped with a manually reset safety
pressure switch for each circuit on the high-pressure side that
complies with European directive 97/23/CE.
Set point: 2900 kPa

12.7 - High and low-pressure side safety valves

BW05 units are equipped with high and low-pressure side
safety valves in accordance with European directive
97/23/CE.
Low-pressure valve setting: 20 or 25 bar depending on the
compressor type used in the units (see "Compressors").
High-pressure valve setting: 32 bar.

12.8 - Moisture indicator

Located in the liquid line, permits control of the unit charge, as
well as the presence of moisture in the circuit. Bubbles in the
sight glass indicate an insufficiant charge or the presence of
non-condensibles. If moisture is present, the colour of the
indicator paper in the sight glass changes.

12.9 - Filter drier in the refrigerant circuit

The filter keeps the circuit clean and moisture-free. The
moisture indicator shows when it is necessary to change the
filter cartridges. A temperature difference between the filter
drier inlet and outlet indicates a contamination of the
cartridges.
VUGFB102