MAXA bi-32V5C MIDI 0128, Technical Bulletin

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i-32V5C MIDI
Inverter Air/Water chillers with axial fan
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1. DESCRIPTION OF UNIT AND TECHNICAL SPECIFICATIONS
The refrigerant chillers in this series are designed for residential and commercial applications. The use of brushless inverter compressor technol-
ogy, combined with an electronic expansion valve, circulator and variable speed fan, optimise the consumption and operating efficiency of the
cooling components.
1.1 FRAMEWORK
Structure suitable for outdoor installation consisting of thick profiles in hot galvanised sheet metal painted with polyester powder, colour RAL
7035 textured, resistant to atmospheric agents.
The removable panels allow maintenance inside the refrigeration and hydraulic circuits.
1.2 COMPRESSORS
Twin rotary hermetic inverter controlled DC compressors, specifically designed to operate with R32, equipped with thermal
protection and mounted on rubber vibration dampers.
This component is installed in a compartment separate from the air flow to reduce noise and is equipped with a crankcase heater that prevents
the dilution of the oil by the refrigerant, ensuring correct lubrication and reducing wear on moving parts.
The compressors can be inspected by removing the side and front panels of the unit, allowing maintenance even when the unit is running.
1.3 AIR SIDE HEAT EXCHANGER
The air exchangers are made entirely of aluminium using micro-channel technology, which makes it possible to significantly reduce both the
pressure drops on the air side and the refrigerant charge, at the same time guaranteeing a greater exchange capacity with the same frontal sur-
face area compared to traditional exchangers and a lower refrigerant charge. On request, the coils can have surface treatments to allow greater
resistance to corrosion.
1.4 UTILITY SIDE HEAT EXCHANGER
Gli scambiatori possono essere equipaggiati di resistenza elettrica antigelo (accessorio opzionale KA1). Brazed plate heat exchanger made of AISI 304
stainless steel, coated with black flexible closed-cell elastomeric foam; thickness 9 mm, thermal conductivity (λ)≤0.036 W/mK (at air +20°C). A flow
switch installed on the water side ensures the presence of water flow and, together with the protection probe, prevents the formation of ice inside.
The exchangers can be equipped with an electric antifreeze heater (optional accessory KA1).
1.5 FAN
The fans are axial type with airfoil blades. They are statically and dynamically balanced and supplied complete with protection grille and air inlet
and outlet with double flared profile, specially shaped to increase efficiency and reduce noise. The electric motor used is driven in modulation
with brushless EC motor, directly coupled, and equipped with integrated thermal protection. The motor has an IP 54 protection rating according
to CEI EN 60529.
1.6 COOLING CIRCUIT
The cooling circuit is made of copper piping, brazed and assembled in the factory in accordance with EN 13134. The components present are:
• Filter drier with 100% molecular sieve cartridge;
• Shut-off valve on the liquid line;
• Liquid flow and moisture indicator;
• Electronic expansion valve;
• Charge connections;
• High-pressure safety pressure switches;
• High and low pressure transducers.
The suction line is thermally insulated with flexible, closed-cell elastomeric foam.
Each unit is pressure tested to check for leaks and is supplied complete with a refrigerant charge optimised for operation.