COOLING
Partial view of the hydronic circuit
Superior reliability
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State-of-the-art concept --
Cooperation with specialist laboratories and use of limit simulation tools ( finite element calculations ) for the design of the critical components , e . g . motor supports , suction / discharge piping etc .
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All aluminium micro-channel heat exchanger ( MCHE ) on cooling only units ( 30RBS ), offers increased corrosion resistance compared to traditional coils . The all-aluminium design eliminates the formation of galvanic currents between aluminium and copper that cause coil corrosion .
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Auto-adaptive control --
Control algorithm prevents excessive compressor cycling and permits reduction of the water quantity in the hydronic circuit ( Carrier patent )
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Hydronic module with integrated pressure transducers allowing measurement of the water pressure at two points , as well as measurement of the water flow rate and detection of lack of water and pressure . This considerably reduces the risk of problems such as frost accumulation on the water heat exchanger .
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Automatic compressor unloading in case of abnormally high condensing pressure . If an anomaly occurs ( e . g . fouled air heat exchanger coil , fan failure ) AquaSnap continues to operate , but at reduced capacity .
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Exceptional endurance tests --
Corrosion resistance tests in salt mist in the laboratory
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Accelerated ageing test on components that are submitted to continuous operation : compressor piping , fan supports
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Transport simulation test in the laboratory on a vibrating table .
Remote operating mode with volt-free contacts ( standard )
A simple two-wire communication bus between the RS485 port of the AquaSnap and the Carrier Comfort Network offers multiple remote control , monitoring and diagnostic possibilities . Carrier offers a vast choice of control products , specially designed to control , manage and supervise the operation of an air conditioning system . Please consult your Carrier representative for more information on these products .
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Start / stop : Opening of this contact will shut down the unit
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Dual set point : Closing of this contact activates a second set point ( example : unoccupied mode )
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Water pump 1 and 2 control ( contacts supplied with the hydronic module option )*: These outputs control the contactors of one or two water heat exchanger water pumps
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Alarm indication : this volt-free contact indicates the presence of a major fault that has led to the shutdown of one or two refrigerant circuits
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Demand limit 1 and 2 : Closing of these contacts limits the maximum unit capacity to three predefined values
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User safety : This contact can be used for any customer safety loop , closing of the contact generates a specific alarm
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Out of service : This signal indicates that the unit is completely out of service
All-aluminium micro-channel heat exchanger ( MCHE )
Already utilised in the automobile and aeronautical industries for many years , the MCHE micro-channel heat exchanger is entirely made of aluminium . This one-piece concept significantly increases its corrosion resistance by eliminating the galvanic currents that are created when two different metals ( copper and aluminium ) come into contact in traditional heat exchangers .
As an option , the Enviro-Shield and Super Enviro-Shield anti-corrosion protections have been developed to increase the application range of the MCHE coil from medium to very corrosive environments . With Enviro-Shield protection , corrosion resistance of the MCHE coil is doubled without any impact on heat exchange .
With Super Enviro-Shield protection corrosion resistance of the MCHE coil is multiplied by four , and allows use in very corrosive industrial or marine environments
The MCHE heat exchanger allows a reduction in chiller refrigerant charge by up to 50 %.
The low thickness of the MCHE reduces air pressure losses by 50 % and makes it less susceptible to fouling ( e . g . by sand ) than a traditional coil . Cleaning of the MCHE heat exchanger is very fast using a dry air jet or a high-pressure washer , while observing the usage precautions .
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