Daikin VAM Series Engineering Data page 72

Control System
Branch duct
Avoid using OA/EA branch duct for multiple Heat Reclaim Ventilator units as much as possible, and instead install ducts for each main unit. (Fig. 1)
Fig. 2 will occur, which makes it impossible for the normal air
duct on the OA/EA side of each Heat Reclaim Ventilator unit
(see Fig. 3), the cost will increase considerably compared to
where the duct is installed for each main unit. Therefore, it is
recommended to install ducts for each unit as much as
possible.
Fig. 2 Branch duct cannot be used.
OA
EA
OA
EA
Heat Reclaim
Ventilator unit (Unit 1)
Heat Reclaim
Ventilator unit (Unit 2)
If there is no damper in the duct system diagram above,
follow the broken line, which causes the amount of air taken in
from the outside to be reduced for OA, and the air to blow out
70
: Air flow
(Outdoor side)
(Indoor side)
SA
RA
Supply grille
Exhaust grille
Supply grille
Exhaust grille
Fig. 1 Provide ducts for each Heat Reclaim Ventilator unit.
(Indoor side)
EA
OA
Heat Reclaim
Ventilator unit (Unit 1)
EA
OA
Heat Reclaim
Ventilator unit (Unit 2)
In the above duct system diagram, if ducts are installed for
the operating conditions of Unit 2.
OA
EA
(Outdoor side)
(Indoor side)
OA
EA
Heat Reclaim
Ventilator unit (Unit 1)
OA
EA
Heat Reclaim
Ventilator unit (Unit 2)
supplied) is provided at each duct on the OA and EA sides and
linked to the operation signal of Heat Reclaim Ventilator unit,
EDMMT712101
: Air flow
Exhaust grille
Supply grille
Exhaust grille
Supply grille
SA
Supply grille
RA
Exhaust grille
SA
Supply grille
RA
Exhaust grille
: Air flow
: Shutter open
: Shutter closed
VAM-HVE/HVLT Series