Multiaqua MAC-036HE, Installation And Operation Manual

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Installation Notes:
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 an 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. The strainer should
be inspected and cleaned as part of regular maintenance during the life of the
chiller.
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 Armacell web site at www.armacell.us/home. For
future servicing of the chiller and air handlers, it is suggested that shut-off ball
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 chiller and air handler.
Chiller shut-off valves should be attached at the chiller connections with unions.
The air handlers are to be controlled with electrically operated, slow-opening
valves, circulators, or motorized zone valves. A thermostat can operate the valves.
Bypass valves, 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 solution between the supply and return chilled liquid
solution lines. In the event air handler valves shut down, the bypass valve is set to
open and bypass liquid solution between the supply and return lines relieving
pressure and thereby 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 syste m with the
liquid solution and before chiller operation.
The field installation of an additional
air bleed port at the highest point in the system is also recommended.
The minimum liquid solution content in the 5 ton chiller system (piping, chiller,
and air handlers), is 25 U.S. gallons. Estimate the system liquid solution content.
Should the system have less than 25 gallons of liquid solution content, a chilled
liquid solution storage tank must be in stalled. The tank stores enough chilled
liquid solution to prevent frequent chiller compressor cycling at light load
conditions. It also prevents chilled liquid temperature swings at higher load
conditions when the chiller compressor is waiting to cycle on the time delay
control.
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