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4. Design guidelines<br />
(1) Remove outdoor fan protective casing.<br />
(2) Install air discharge ducts on all outdoor units. Fix the duct against the louver if existing.<br />
(3) Louver angle: 20 degrees from horizontal<br />
(4) Air velocity: Discharge air VD=5–8 m/s and Suction air VS ≤1.6 m/s<br />
(5) Total pressure loss (through the discharge duct and the louver) should be less than 58.8 Pa for VRVII and 78.4Pa for VRVIII<br />
(with high static pressure setting).<br />
(6) Space should be left for suction air to circulate freely and for installation/service/maintenance to be done.<br />
5. Illustration<br />
Diagram below indicated the minimum distance for the unit layout<br />
in case of a floor-by-floor installation<br />
Air velocity<br />
VD: Air discharge effective velocity<br />
Flow rate<br />
VD=<br />
Discharge effective surface<br />
VS: Air suction effective velocity<br />
VS=<br />
Flow rate<br />
Suction effective surface<br />
Discharge effective surface = Actual discharge surface x Louver opening ratio Suction effective surface = Actual suction surface x<br />
Louver opening ratio<br />
5 m.s -1 ≤ VD ≤ 8 m.s -1<br />
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Louver angle: ≤ 20° downwards<br />
VS ≤ 1.6 m.s -1<br />
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Total pressure loss: Less than 58.8 Pa for VRVII and 78.4Pa for VRVIII<br />
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Example:<br />
40HP per floor installed, with a structure facing the installation at 5 meters distance.<br />
From graph, maximum number of floors the installation can be safely done: 20 Floors.<br />
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Outdoor Unit Layout Guide 16
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