references
Remote management (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. - 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) - Demand limit: Closing of this contact limits the maximum chiller capacity to a predefined value - User safety: This contact is connected in series with the water flow switch and can be used for any customer safety loop - Heat reclaim (option): Closing of this contact allows heat reclaim mode operation - Water pump 1 and 2 control*: These outputs control the contactors of one or two evaporator water pumps - Water pump on reversal*: These contacts are used to detect a water pump operation fault and automatically change over to the other pump - Operation indication: This volt-free contact indicates that the chiller is operating (cooling load) or that it is ready to operate (no cooling load) - Alert indication: This volt-free contact indicates the presence of a minor fault - 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
*Contacts already supplied with the hydronic module option
All aluminium micro-channel heat exchanger (MCHE)
COOLING
Already utilised in the automobile and aeronautical industries for many years, the MCHE 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. Unlike traditional heat exchangers the MCHE heat exchanger can be used in moderate marine and urban environments. From an energy efficiency point-of-view the MCHE heat exchanger is approximately 10% more efficient than a traditional coil and allows a 40% reduction in the amount of refrigerant used in the chiller. 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 high-pressure washer.
Controls
Pro-Dialog Plus control
Pro-Dialog Plus combines intelligence with operating simplicity. The control constantly monitors all machine parameters and precisely manages the operation of compressors, expansion devices, fans and of the evaporator water pump for optimum energy efficiency. Energy management - Internal time schedule clock: permits chiller on/off control and operation at a second set point - Set point reset based on the outside air temperature or the return water temperature - Master/slave control of two chillers operating in parallel with operating time equalisation and automatic change-over in case of a unit fault. - Start/stop control based on the air temperature Ease-of-use - User interface with synoptic diagram for intuitive display of the principal operating parameters: number of compressors operating, suction/discharge pressure, compressor operating hours, set point, air temperature, entering/leaving water temperature - Ten menus for direct access to all machine commands, including fault history, allowing fast and complete chiller diagnostics
Pro-Dialog Plus operator interface
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