Carel MC, User Manual

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8
ENG
MC DUCT +03U400025 - rel. 4 - 20201201
2. INSTALLATION
2.1 Instructions
Step 1: Installation Rules
The following general rules need to be applied to any MC
installation. Carel will not take responsibility for any system
installed that does not follow these rules and warranty may be
voided.
1. All atomizing heads on a system must be at the same
elevation. Due to the low water pressure involved, a deviation
in elevation of heads of more than 3 inches may be enough to
cause the lower heads to spray heavy while the higher heads
don’t spray at all.
2. Keep minimum pressure drops in the air and water
piping. Always use minimum 1/2” I.D. water lines. Use minimum
1/2” I.D. air lines up to 200 lbs/hr in capacity and/or when the
total system layout is less than 100 feet. Use minimum 3/4” I.D.
air lines when the system capacity is over 200 lbs/hr and/or they
total system layout is more than 100 feet. Avoid excessive use of
sharp 90° elbows - neatness is secondary to function. NOTE: It is
the installer’s responsibility to insure that the air and water lines
are sized to provide proper pressure and volume to the cabinet
and then to the atomizing heads.
3. Avoid vertical bends in air and water system piping.
These could trap dirt, water or air and prevent proper blowout of
the lines during maintenance.
4. Heads should be mounted above the air and water
lines. This insures that sediment and debris will not flow into the
atomizing heads to cause maintenance.
5. Position atomizing heads to avoid direct discharge onto
obstructions. As a rule of thumb, the atomizing heads discharge
a plume of mist up to 15 feet long and to 4 feet in diameter.
Anything in this plume has the potential to get wet.
6. Position the heads to allow access for maintenance.
Position over aisles or along walls where access is easy, rather
than over equipment and racks.
7. For optimal performance, the control cabinet should be
located at least 3 feet below the elevation of the atomizing heads.
This is to allow a column of water pressure against the water
regulator contained in the control cabinet to allow controllability.
8. Size the compressor properly. 0.15 CFM (0.12 SCFM) per
pound of water per hour is required. DO NOT UNDERSIZE AIR
COMPRESSORS. The system cabinets should be fed with 100 psi
of compressed air. Internal regulators are used to reduce it to the
required discharge pressure to the atomizing heads (30 psi at
manifold ends).
*DO NOT install the cabinet more than 3 feet above the manifold
it is controlling.
9. Compressed air must be clean and without oil.
Compressor after cooler, moisture separator and trap, and 0.1
micron coalescing filter are the minimum requirements. Oil
from compressed air will cause excessive maintenance on the
atomizing heads, causing a premature buildup of mineral around
the water nozzle tip and in the front air orifice of the atomizing
heads, blocking air flow and causing a heavy spray.
10. Insure proper water supply. 20 psi to the cabinet is
the recommended minimum. If water lines are old, steel, or
galvanized, then a water filter is required prior to the control
cabinet. NEVER use steel or galvanized pipe within the system.