Carrier Aquasnap 30RB 160R User Manual

8 - WATER CONNECTIONS
When connecting units to the water distribution pipe work, refer
to the certied dimensional drawings supplied with the unit for the
dimensions and position of the water inlet and outlet connections.
The piping must not transmit any axial or radial force to the
exchangers, or any vibrations.
The water must be analysed and the circuit must include provision
of any necessary water treatment: Filters, additives, intermediate
exchangers, bleed valves, vents, shut-o󰀨 valves, etc. depending
on the results, in order to prevent corrosion (e.g. damage to the
surface of the tubes due to impurities in the uid), fouling and
deterioration of the pump lining.
Before any start-up, make sure the heat-transfer uid is compatible
with the water circuit materials and coating. Where additives or
uids other than those recommended by the manufacturer are
used, ensure that these are not considered gases, and that they
are class 2, as dened in directive 2014/68/EU.
Manufacturer's recommendations concerning heat transfer
uids:
- No NH
4+
ammonium ions in the water, they are very harmful
to copper. This is one of the most important factors for the
operating life of copper piping. A content of several tenths of
mg/l will badly corrode the copper over time.
- Cl
-
Chloride ions are also harmful to copper with a risk of
perforating corrosion. Keep at a level below 125 mg/l.
- SO
4
2-
sulphate ions can cause perforating corrosion, if their
content is above 30 mg/l.
- No uoride ions (<0.1 mg/l).
- No Fe
2+
and Fe
3+
ions with non negligible levels of dissolved
oxygen must be present. Dissolved iron < 5 mg/l with
dissolved oxygen < 5 mg/l.
- Dissolved silicon: silicon is an acid element of water and can
also lead to corrosion risks. Content < 1 mg/l.
- Water hardness: >0.5 mmol/l. Values between 1 and 2.5 are
recommended. This will facilitate scale deposits that can limit
the corrosion of copper. Values that are too high can cause
piping blockage over time. A total alkalimetric titre (TAC)
below 100 mg/l is desirable.
- Dissolved oxygen: Avoid any sudden change in water
oxygenation conditions. It is as detrimental to deoxygenate
the water by mixing it with inert gas as it is to over-oxygenate
it by mixing it with pure oxygen. The disturbance of the
oxygenation conditions encourages destabilisation of copper
hydroxides and enlargement of particles.
- Electric conductivity 10-600 µS/cm.
- pH: Ideal case pH neutral at 20-25 °C (7.5 < pH < 9).
IMPORTANT: Filling, topping up or emptying of the water circuit
must be carried out by qualied personnel using the air bleed
devices and tools and equipment suitable for the products.
The heat-transfer uid should be lled and drained using
devices tted to the water circuit by the installer. Never use
the unit heat exchangers to add heat-transfer uid.
8.1 - Operating precautions and
recommendations
Before commissioning, make sure the hydraulic circuits are
connected to the appropriate heat exchangers.
The water circuit must have as few bends and horizontal sections
at di󰀨erent levels as possible,
Main points to be checked for the connection:
- Make sure that the stainless steel water lter is in the screen
lter. (See gure 2).
- Comply with the water inlet and outlet connections shown on
the unit.
- Install manual or automatic air purge valves at all high points
in the circuit.
- Maintain the pressure of the circuit(s) with a pressure-
reducing valve and install a relief valve and an expansion
vessel. Units supplied with a hydraulic module include a valve.
The expansion vessel is supplied as an option.
- Install thermometers in both the water inlet and outlet pipes.
- Install drain connections at all low points to allow the whole
circuit to be drained.
- Install shut-o󰀨 valves close to the water inlet and outlet
connections.
- Use flexible connections to reduce the transmission of
vibrations.
- Insulate the cold water pipework, after testing for leaks, to
prevent heat transmission and condensation.
- Cover the insulation with a vapour barrier. If the water pipes
outside the unit pass through an area where the ambient
temperature is likely to fall below 0°C, it must be protected
against frost (antifreeze solution or electric heaters)
- Do not introduce any static or dynamic pressure into the heat
exchange circuit which signicantly deviates from the design
operating pressures.
- The use of di󰀨erent metals in the hydraulic system may create
galvanic couples and lead to corrosion. Verify the need to
install sacricial anodes.
- Products used for thermal insulation of recipients during
hydraulic connection must be chemically neutral to the
surfaces on which they are applied. All original materials
supplied by the manufacturer comply with this requirement.
NOTE:
A screen lter must be installed for units supplied without a
hydraulic module. This must be installed on the water inlet
pipe, upstream of the pressure di󰀨erential gauge and close
to the unit heat exchanger. It must be located somewhere
easily accessible to enable disassembly and cleaning.
The mesh size of the lter must be no more than 1.2 mm.
If the lter is missing, the plate heat exchanger can quickly
become fouled during the rst start-up, as it will trap any
debris in the system, and correct unit operation will be
affected (reduced water flow rate due to the increased
pressure drop).
Units with a hydraulic module are equipped with this type of lter.
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Carrier Aquasnap 30RB 160R Specifications

General

Brand	Carrier
Model	Aquasnap 30RB 160R
Category	Chiller
Language	English