It must be recognized that ferrous pipe may cause accelerated deterioration of the brazed plate
heat exchanger and could void the heat exchanger warranty.
*Also Included in this manual is a piping section that includes piping system design, installation and balancing.
Equipment sizing for a Multiaqua solution system can utilize Load Diversity. Diversity is described as the
actual amount of cooling or heating needed by various sections of a structure at a given time. Conventional central ducted
air systems are designed for peak load conditions and must supply peak load capacity at all times to the conditioned space
whether or not a demand exists for other zones. This introduces great system inefficiencies. A system sized to take advantage
of diversity would determine the load by the time of day, building exposure, usage and adjust accordingly. To further define
load diversity a structure utilizing a conventional central ducted air system would require six (6) tons of capacity at peak load.
However, with the Multiaqua -MACH the specific load can be addressed and a smaller system utilized (potentially four (4)
or (5) tons instead of the full capacity’s 6 ton system. By taking advantage of load diversity, the system supplies the
necessary amount of capacity to the spaces or zones on an as needed basis instead of producing a larger capacity
100% of the time.
To clarify this concept we will adapt the above information to a basic Multiaqua System. Utilizing diversity and a MACH-
060 five (5) ton reverse cycle chiller we can supply chilled liquid solution to six (6) MHWW-12 (1) ton fan coils. Three (3) of
which are located in rooms facing west and three (3) in rooms facing east. Diversity dictates that the high load zones
(spaces) in a building need more cooling during different times of the day. A cooling load in the morning (AM) would
be greatest for portions of a structure facing east. During midday spaces with skylights or upper floors or multi-floor
structures impose more loads on the system. In the afternoon (PM) the load shifts to western facing spaces of the structure.
The Multiaqua system will adjust to load by supplying chiller or heated liquid solution to where and when it’s needed
depending on the changing load of the structure. In this simple example, it would be possible for a five (5) ton system to
handle what would normally be a six-ton load on a conventionally ducted system.
Load diversity can best be determined by referring to the ACCA (Air Conditioning Contractors of America) Manual “J”,
refer to Appendix A-2, Multi-Zone Systems. ACCA can be located at the following Internet address:
www.acca.org
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