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Installation Instructions
Indoor Units
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Connect the duct connections to unit supply and return air ducts.
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Refer to GA drawing for unit supply and return duct connection sizes and locations.
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Use canvas connection between unit & supply air duct to avoid the transmission of vibration to the duct.
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Don't run the unit without filter on return air side.
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Avoid abnormal duct size increases and reductions. It can adversely affects air and cooling performance.
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When electrical heater is installed, use fireproof canvas (or similar heat resistance material) between duct & unit
discharge connection.
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Do the proper duct sizing for air quantity (L/s or cfm) recommended at various External Static Pressures.
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All ducting should be insulated properly to avoid heat transfer.
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All ducts should be secured properly to building structural opening should be sealed properly to avoid any air
leakage or condensation.
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All main branch ducts (without 90° elbow) should be acoustically lined up to min. 10 ft length with the help of all
perforated sheet & fiber glass insulation of recommended density & thickness.
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Ensure Room thermostat fixed at proper location, sensing return air or room temperatures and set the thermostat
not less than 70° F.
Outdoor Unit Location and Mounting
Locating Unit
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Consult local building codes or ordinances for special installation requirements.
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Unit must be lifted by 2" pipe hook rigging sling in base rail, use spreader bar to prevent the sling from damaging
the unit.
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A minimum clearance of 1 m on serviceable side, 300 mm for air inlets on all sides and 1.5 m for air discharge (unit
top) is required.
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The unit must be located outdoor only and cannot be connected to duct work.
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The metal parts of the unit if subjected to salt spray, fog or mist in seacoast areas could lead to rapid
corrosion/oxidation and may lead to premature failure.
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Interconnecting tubing.
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Vapor and Liquid lines.
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Keep all lines sealed until connection is made.
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Make connections at the indoor coil first.
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In dual circuit units, ensure Liquid & Suction tubes at indoor & out door units are brazed to
corresponding systems.
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Connect the filter drier and sight glass at the liquid line in the flow direction marked on the components.
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Perform the Leak check at all the brazed and flare joints.
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Perform system Evacuation up to 200 microns.
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Factory charged unit is sufficient for 25 feet of interconnecting tubing.
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Maximum length of lines
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The maximum equivalent length of interconnecting line is 200 feet. Always use the shortest length
possible with minimum number of bends.
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If the application call for more length of piping, please contact our sales officer.
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Sizing
Please refer the Guideline for inter connecting piping.
COMMERCIAL DUCTED SPLITS
07
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