Carrier 30RBM 160 Installation, Operation And Maintenance Instructions

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Carrier 30RBM 160 Installation, Operation And Maintenance Instructions Manual pdf 27 page image

278 - WATER CONNECTIONSWhen connecting units to the water distribution pipe work,refer to the certified dimensional drawings supplied with theunit for the dimensions and position of the exchanger waterinlet and outlet connections.The piping must not transmit any axial or radial force to theexchangers, or any vibrations.The water supply must be analysed and the circuit createdmust include the required water treatment elements: filters,additives, intermediate exchangers, bleed devices, vents, shut-off valves, etc., according to the results, to prevent corrosion(for example, damage to the tube protective surface if thereis contamination in the fluid), fouling and deterioration of thepump liningBefore any start-up, make sure the heat-transfer fluid iscompatible with the water circuit materials and coating. Whereadditives or fluids other than those recommended by themanufacturer are used, ensure that these are not consideredgases, and that they are class 2, as defined in directive 2014/68/EU.Manufacturer's recommendations concerning heat-transferfluids:• No NH4+ ammonium ions in the water - these are very harmfulto copper. This is one of the most important factors for theoperating life of copper piping. A content of several tenthsof mg/l will badly corrode the copper over time.• Cl- Chloride ions are also harmful to copper with a risk ofperforating corrosion. Keep at a level below 125 mg/l.• SO4 sulphate ions can cause perforating corrosion if theircontent is above 30 mg/l.• No fluoride ions (<0.1 mg/l).• No Fe2+ and Fe 3+ ions with non-negligible levels of dissolvedoxygen must be present. Dissolved iron < 5 mg/l withdissolved oxygen < 5 mg/l.• Dissolved silicon: silicon is an acid element of water and canalso lead to corrosion risks. Content < 1 mg/l.• Water hardness: >0.5 mmol/l. Values between 1 and 2.5 arerecommended. This will facilitate scale deposit that can limitcorrosion of copper. Values that are too high can cause pipingblockage over time. A total alkalimetric titre (TAC) below100 mg/l is desirable.• Dissolved oxygen: Avoid any sudden change in wateroxygenation conditions. It is as detrimental to deoxygenatethe water by mixing it with inert gas as it is to over-oxygenateit by mixing it with pure oxygen. The disturbance of theoxygenation conditions encourages destabilization of copperhydroxides and the release of particles.• Electrical conductivity 10-600 μS/cm.• pH: Ideal case pH neutral at 20-25°C (7.5 < pH < 9).Filling, topping up or emptying of the water circuitmust be carried out by qualified personnel using theair bleed devices and tools and equipment suitablefor the products.The heat-transfer fluid should be filled and drainedusing devices fitted to the water circuit by theinstaller. Never use the unit heat exchangers to addheat-transfer fluid.8.1 - Operating precautions and recommendationsBefore the system start-up, make sure the hydronic circuitsare connected to the appropriate heat exchangers.The water circuit must have as few bends and horizontalsections at different levels as possible.Main points to be checked for the connection:• Observe the water inlet and outlet connections shown on theunit.• Install manual or automatic air purge valves at all high pointsin the circuit.• Maintain the pressure of the circuit(s) with pressure reducersand install a safety relief valve and an expansion tank. Unitssupplied with a hydronic module include a valve. Theexpansion 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 wholecircuit to be drained.• Install shut-off valves close to the water inlet and outletconnections.• Use flexible connections to reduce the transmission ofvibrations.• Insulate the cold water pipework, after testing for leaks, toprevent heat transmission and condensation.• Cover the insulation with a vapour barrier. If the water pipesoutside the unit pass through an area where the ambienttemperature is likely to fall below 0°C, it must be protectedagainst frost (antifreeze solution or electric heaters)• If there are particles in the fluid which are liable to foul theexchanger, a screen filter must be installed upstream of thepump. The mesh size of this filter must be 1.2 mm (see Typicalhydronic installation diagram).NOTE:A screen filter must be installed for units supplied without ahydronic module. This must be installed on the unit's waterinlet pipe, as close as possible to the unit heat exchanger. Itmust be located somewhere easily accessible to enabledisassembly and cleaning.If the filter is missing, the plate heat exchanger can quicklybecome fouled during the first start-up, as it will trap anydebris in the system, and correct unit operation will beaffected (reduced water flow rate due to the increased pressuredrop).• Do not introduce any excessive static or dynamic pressureinto the heat exchange circuit (with regard to the designoperating pressures).• Products used for thermal insulation of recipients duringhydronic connection must be chemically neutral to thesurfaces on which they are applied. All original materialssupplied by the manufacturer comply with thisrequirement.