Daikin VAM-FA Technical Data Manual page 51

13 Installation
13 - 2 Reducing operating sound
13 - 2 - 4 Effect of remedy for sound
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 the flexible duct at the same time.
13 - 2 - 5 General comparison of the effect (
Mounting a silencer + flexible duct 2 m long
1
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.
13 - 2 - 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.
• Heat reclaim ventilation • VAM-FA/FB
2
Main body
Silencer
Flexible duct 6 m
5 Mounting a silencer 6
Main body
Silencer
Spiral duct 6 m
• Ventilation • Heat reclaim ventilation
→
in more effective order)
1 6
Mounting a flexible duct Mounting a flexible duct
3
6 m long 2 m long to the main body
Main body
Flexible duct 6 m
Spiral duct 6 m
No measures taken
(dB)
Main body
Spiral duct 6 m
Suction /
discharge gri
Main body
Flexible duct 2 m
Spiral duct 4 m
1 2 3 4 5 6
(HC0061)
3
1
13
49