3
1
13
• Ventilation • Heat reclaim ventilation
51
• Heat reclaim ventilation • VAM-FA/FB
13
Installation
13 - 4 Cautions
Use suspension bolts for installation. Confirm that the place for
installation can stand the weight of the unit. If not, reinforce the place
with beams, etc. and install the suspension bolts.
If the strength of the place for installation is not sufficient, the place
resonates to the vibration of the unit and abnormal noise may be
transmitted.
Be sure to provide a service space and an inspection hole for inspection
of air filter, heat exchange element and fan. HRV units require one
inspection hole.
Some local regulations may not allow the use of bellows in view of the
safety for fire prevention. Before using the bellows, contact
administrative agencies or fire department in your district. Note that
bellows are not allowed in Tokyo in accordance with the Fire Prevention
Act of Tokyo.
When exhausting air into centralized duct
(vertical hole), the Building Standards Act
requires that the duct must be capable of
preventing fire from expanding through the
duct should a fire break out.
When a riser duct of steel plate of 2 m long is
installed
When a smoke back flow prevention damper is
installed
Caution
• Installing a 2 m exhaust duct in a centralized duct involves difficulty in
construction and maintenance, and is not practised generally. In
actual installation, the approved smoke back flow prevention dam per
is used, Use Daikin's optional smoke back flow prevention damper.
Air filter cleans the air and prevents clogging of the element, and must
be installed properly.
Ambient conditions for use: –10°C to 50°CDB at 80% RH or less
Outdoor air temperature condition
When used below –10°C, indoor air temperature varies greatly from
outdoor air temperature and frost may form on the heat exchange
element depending on conditions of temperature and humidity. Further,
the frost formation may be frozen. The frozen frost melts during the day
as the temperature rises but the heat exchange efficiency drops before
the frozen frost is melted.
In a place where the temperature exceeds 50°C, deformation of resin
parts such as air filter and reduced life of motor and electric parts due to
deteriorated insulation are considered.
Conditions:
1. Install the unit on a rigid and stable place. Refer to the
specification and weight of the unit.
2. Install a service space and an inspection hole. Refer to
the outline drawing for details.
3. Bellows may not be able to use depending on the local
regulations. (In the case in Japan)
4. When exhausting air into the centralized duct (vertical
hole), install a riser duct of steel plate of over two meters
long inside the vertical hole or install an approved smoke
back flow prevention damper. (In the case in Japan)
(HC0065)
Rigid mounting
2 m
or
mo
re
Fill mortar
Centralized duct
(Vertical hole)
Cross sectional area :
Less than 250 cm
2
Steel plate of
0.8 mm thick or more
Fan
5. Air filters are provided on the air intake side and exhaust
air side. Be sure to install these filters.
6. Confirm the using conditions of HRV units before
installation.
As a countermeasure, preheating of the
air on low temperature side is
considered.
7. The precise available conditions are shown
below.
Ambient temperature & humidity for
HRV unit
–10
°
C
to 50
°
CDB 80% RH or less
Indoor / Outdoor air
–10
°
C
to 43
°
CDBThe relative humidity
[% RH] is as
described below
(HC0066)
Centralized duct
(Vertical hole)
Cross sectional area :
Less than 250 cm
2
Steel plate of
0.8 mm thick or more
Smoke back flow
prevention damper
Inspection hole
(450·450 or more)
Fan
