Daikin VAM-FA8VE, Technical Data Manual

Page: 141 / 282

• HRV • Heat Reclaim Ventilation
139
• HRV • VAM-FA8VE
1
10
10 Installation
10-2 Centralized piping
Because the air flow shown in Fig.1 is generated when centralized
OA and EA pipings for two or more HRV units normal air flow
cannot be maintained. If a back flow prevention damper is
installed in the duct on OA and EA side of each HRV units (Fig.3),
costs will increase as compared with the case a duct is installed for
each body. It is therefore recommended that a duct be in-stalled
for each body.
(Before installing the back flow prevention damper, contact our
engineering section.)
Wherever possible, avoid centralized OA and EA pipings
for two or more HRV units, and install ducts for each
body of the unit. (Fig. 2)
Fig.2: Install a duct for each HRV unit.
In the above duct system diagram, the air of No.1 unit
will flow into normal direction regardless of the
operation of No.2 unit when one duct is provided for
each unit.
EA
OA
:
(HC0062)
(Indoor side)
(O
ut
door
side
)
Discharge grille
Discharge grille
Air suction grille
Air suction grille
Direction of
air flow
HRV units (No. 1 unit)
HRV units (No. 2 unit)
Fig.1: Centralized piping cannot be installed. Fig.3: Install a back flow prevention damper on each
duct on OA and EA sides. (Field supply)
In the above duct system diagram, if a damper is not
provided and No.1 unit is operated with No.2 unit
being stopped, the air flows in the direction indicated
by a broken line, the amount of the air supplied from
outside to OA side is decreased, and the air is
discharged from the discharge grille of EA side.
Therefore, the air will not flow into the normal
direction.
In the above duct system diagram, if a back flow
prevention damper (field supply) is installed on each duct
on OA and EA sides and the damper interlocked to the
operation signals of HRV units, faults such as those shown
in Fig.1 can be eliminated and the normal air flow
maintained.
(Note, however, that the above does not apply to the
standard duct system.)
OA EA
OA
EA
RA
:
:
:
OA
OA
EA
RA
SA
:
(HC0063)
(HC0064)
(Indoor side)
(Outdoor side)
Discharge grille
Discharge grille
Air suction grille
(Outdoor side)
(Indoor side)
Discharge grille
Discharge grille
Air suction
grille
Air suction
grille
Air suction
grille
HRV units (No. 1 unit)
HRV units (No. 2 unit)
Direction of air flow
Damper opened
Damper closed
HRV units (No.
1 unit)
HRV units (No. 2 unit)
Direction of air flow