Partial view of the hydronic circuit
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. - 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. Auto-adaptive control - Control algorithm prevents excessive compressor cycling and permits reduction of the water quantity in the hydronic circuit (Carrier patent) - 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. - 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. Exceptional endurance tests - Corrosion resistance tests in salt mist in the laboratory - Accelerated ageing test on components that are submitted to continuous operation: compressor piping, fan supports - Transport simulation test in the laboratory on a vibrating table.
Start/stop: Opening of this contact will shut down the unit Dual set point: Closing of this contact activates a second set point (example: unoccupied mode) 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 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 Demand limit 1 and 2: Closing of these contacts limits the maximum unit capacity to three predeﬁned values User safety: This contact can be used for any customer safety loop, closing of the contact generates a speciﬁc alarm 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.
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.