Table of Contents
Advertisement
The evaporators and condensers are single-circuit for all units.
The water connections between the heat exchangers and the
piping of the hydronic modules have quick-connect Victaulic
couplings to facilitate pump disassembly, if required.
A drain with a 1/4 turn valve is included in the leaving water of
all heat exchangers.
The evaporators have 19 mm thick polyurethane foam thermal
insulation. For option 86 (condenser insulation), the condensers
also have 19 mm thick polyurethane foam thermal insulation.
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.
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.
•
If there are no regulations or to complement them follow
the control programmes of EN 378.
•
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%.
12.4 - Electronic expansion valve (EXV)
The EXV is equipped with a stepper motor (2625 + 160 /- 0
steps) that is controlled via the EXV board.
12.5 - Refrigerant
BW10 units operate exclusively with R-410A.
12.6 - High-pressure switch and high-pressure sensor
BW10 units are equipped with an automatically reset safety
pressure switch on the liquid line. Refer to the controls manual
for the alarm acknowledgements.
It is strictly forbidden to modify the unit refrigerant circuit. The
pressure switch is specific to the BW10 units - do not
interchange it with other units. The pressure switch tap does not
include a Schrader valve.
High-pressure switch
The high-pressure sensor is however equipped with a Schrader
valve. It is specific to these units and must not be replaced with
one from other Danfoss units.
12.7 - High and low-pressure side safety valves
The units are equipped with safety valves in accordance with
the European directive 97/23/CE. These safety valves are
calibrated and sized in accordance with the original high and
low-pressure side equipment.
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.
High-pressure sensor
33
Advertisement
Table of Contents
