Multiaqua CFFWA Series, Руководство по эксплуатации

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Piping such as PEX, steel, copper or PVC can be used with the Multiaqua system. Check local building codes for
material conformation. Care must be taken when using PVC as the presence of propylene glycol may destroy
plastics. Pressure drop data for the selected piping material is readily available and should be used. Should the
Multiaqua chiller be installed using existing steel (ferrous metal) piping system, dielectric fittings must be used
at the chiller and air handler. The factory supplied wye strainer will capture particles of rust and sediment
inherent with steel piping and should be checked and cleaned after initial start up and open a regular maintenance
during the life of the system.
Any piping used to conduct liquid solution must be insulated in accordance with local and national mechanical
codes. Information on insulation installation and application can be obtained from Armaflex web site at
www.armaflex.com and Owens-Corning site at www.owenscorning.com/mechanical/pipe/. For future servicing
of the chiller and air handlers, it is suggested that shutoff valves be installed at the chiller and air handler (s). If
ball valves are used, they can double as balancing valve (s) in the supply piping at each air handler. Chiller
shutoff valves should be attached at the chiller connections with unions.
The air handlers are to be controlled with electrically operated "slow-opening" solenoid valves, circulators or
motorized zone valves as manufactured by Erie controls (www.eriecontrols.com/products/index.htm) A remote
thermostat or air handler installed digital control operates the valves.
Bypass valves as shown in drawing 1, should be installed between the supply and the return chilled liquid
solution supply pipes at a convenient location to the installation. The bypass valve operates to bypass liquid solutio
between the supply and return chilled liquid solution lines. In the event air handlers valves should shut down, the
bypass valve is set to open up and bypass liquid solution between the supply and return lines, relieving pressure
and eliminating the possibility of pump cavitations. To adjust the valve, run the system with one air handler
solenoid actuated. De-energize the solenoid valve, (at this point no liquid solution will be flowing through the air
handlers.) and adjust the bypass valve to relieve pressure between the supply and return piping.
Bleed ports will be factory installed on all Multiaqua air handlers. Bleed ports are opened to eliminate air trapped
in the air handlers after filling the system with liquid solution and Propylene Glycol, and before operating the
refrigerant compressor in the chiller.
The minimum liquid solution content in the chiller system, (piping, chiller, and air handlers), is 25 U.S. gallons.
Estimate the system liquid solution content. Should the system have less than 50 gallons of liquid solution
content, a chilled liquid solution storage tank must be installed. The tank stores enough chilled liquid solution
to prevent frequent chiller compressor cycles at light load and prevents chilled liquid temperature swings at
higher load conditions when the chiller compressor is waiting to cycle on the time delay control.
Propylene Glycol must be added to the water used in the system. Propylene helps prevent freeze-ups due to
low ambient temperature conditions and low chilled liquid solution temperatures. In comparison to water,
Propylene Glycol slightly lessons the temperature exchange in the chiller heat exchanger. However, that is
offset by the increased flow of liquid solution through the piping system enabled by the Propylene Glycol. To
determine the Propylene Glycol content for various ambient temperatures refer to table 6 page 72.
In no instance should a Multiaqua chiller be installed with less than 10% Propylene Glycol content in the piping
system. Using less than the recommended Propylene Glycol percentage content voids equipment warranty.
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Installation Notes: