Daikin VAM-FA8VE Technical Data Manual page 181

7 Product Specification
7 - 1 VKM-GAMV1
7 - 1 - 7 Reducing Operating Sound
The air suction and discharge grille may give out operating sound higher by 8 to 11 phons than of the HRV units body.
When installing this unit in a quiet place, take measures to reduce operating sound.
7 - 1 - 7 - 1 Points for Reducing Operating Sound
1. Operating sound heard from the air discharge outlet can be
reduced just by applying sound-insulating material to the SA
(indoor air supply) duct.
HRV unit
EA
OA
Apply sound-insulating
material to the SA duct.
7 - 1 - 7 - 2 Taking Measures to Reduce Operating Sound Heard from Attic-installed Equipment and Air Ducts.
1. When installing large air volume models (650 m
avoid the following wherever possible if it is expected to be
necessary to apply sound-insulating material to them. (Fig.1)
(1) (4) (3)
Fig. 1
(1)Making the duct diameter extremely small (Example: φ 250 →
φ 150, φ 200 → φ 100)
(2)Making the duct extremely bent using bellows (in particular,
connecting bellows to the air discharge outlet of the unit body)
(3)Making opening holes on the ceiling
(4)Hanging the unit on a material which does not have enough
hanging strength
• HRV • VKM-GAMV1
Air suction /
discharge
RA
grille
SA
Flexible duct
(HC0054)
3
/ h or more),
(2)
(HC0056)
• HRV • Heat Reclaim Ventilation
2. Operating sound can be reduced more effectively by applying
sound-insulating material to a portion of the SA duct near the unit
body than that near the air suction / discharge grille.
HRV unit
EA
OA
Apply sound-insulating
material here for effective
operating sound reduction.
2. Take the following sound reduction measures. (Fig.2)
(1)
Fig. 2
(1)Use a sound-insulating (low-permeability-to-sound) ceiling.
Note :
Some sound-insulating ceilings are not very effective in reducing
low-frequency element of the operating sound.
(2)Place a sound-reducing material under the source of the
operating sound.
Note :
When using a sound-insulating sheet, it is necessary to have the
entire body of the unit covered with it. Note, however, that some
models do not allow the use of a sound-insulating sheet because
it may badly affect the ventilation of their radiation heat.
Air supply
and exhaust
RA
grille
SA
Flexible duct
(HC0055)
(2)
(HC0057)
2
7
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