Daikin VAM-FA8VE Technical Data Manual page 140

10 Installation
1
10-1 Reducing operating sound
10-1-4 Effect of remedy for sound
10
Caution
1. Be sure to connect a flexible duct (2 m) to an outlet of the main body in the indoor air supply side.
2. Do not connect a spiral duct and an alminium bellows directly to the outlet of the main body.
* A silencer is effective especially when using theflexible duct at
the same time.
10-1-5 General comparison of the effect (
1 Mounting a silencer + flexible duct 2 m long
Mounting a silencer + flexible duct 6 m long
Main body
Silencer
Flexible duct 2 m
Spiral duct 4 m
(Effect of a remedy for noise does not change
even for over 2 m long duct)
4 Mounting a flexible duct
2 m long to an air suction
discharge grill
Main body
Spiral duct 4 m
Flexible duct 2
m
Note:
Measure the noise at 1.5 m below the air supply grille. Operating noise conforms to JIS standard and the value is converted in terms of the
anechoic chamber.
10-1-6 Nameplate for note
"Notes for duct work" is written on the HRV units as indicated below.
• When connecting a spiral duct or an aluminum bellows, sound at the air discharge outlet is higher by 8~11 phon than the main body
operating sound.
• When using this unit in a quiet place, take a remedy for sound by connecting an optional flexible duct at the outlet of the indoor air
suction side of the main body.
138
• HRV • VAM-FA8VE
1
2
Main body
Silencer
Flexible duct 6 m
5 Mounting a silencer 6
Main body
Silencer
Spiral duct 6 m
• HRV • Heat Reclaim Ventilation
→
in more effective order)
6
Mounting a flexible duct 3
6 m long
Main body
Flexible duct 6
m
Spiral duct 6 m
No measures taken
Main body
Spiral duct 6 m
Suction /
discharge grill
Mounting a flexible duct
2 m long to the main body
Main body
Flexible duct 2
m
Spiral duct 4 m
1 2
3 4
(dB)
6
5
(HC0061)