System Installation Restrictions - Mitsubishi Electric QAHV Série Manuel D'installation & D'instructions

(3) Combination of face-to-face and side-by-side installations
When there are walls in the front and rear of
the block of units
Ⓐ
h2'
500 (19-11/16)
Required minimum distance [mm (in)]
L2 (Right) L2' (Left)
300 + h2 300 + h2'
(11-13/16 + h2) (11-13/16 + h2')
Ⓐ Leave open in two directions.

[3] System installation restrictions

• Piping length restrictions
The maximum piping length is 60 m (196 ft).
Select appropriate diameter pipes to prevent negative pressure from the pumping head and the pressure loss in the
pipes.
Pumping head (when maximum flow rate is 20.5
• Installation height restrictions
• When the unit is installed above the storage
tank
Decide the height so that the unit inlet water
pressure will not be negative for the tank
pressure.
Unit inlet water pressure > 0 MPa (0 ftAq)
Heat
pump
unit
Storage
h2
500
(19-11/16)
L2
L4
Ⓐ
L2'
L4 (Between)
1000 (39-3/8)
ℓ
tank
When there are two walls in an L-shape
L3
Ⓐ
Required minimum distance [mm (in)]
L2 (Right)
300 + h2
(11-13/16 + h2)
/min (5.4 GPM)): 68 kPa (22.8 ftAq)
• When the unit is installed below the storage
tank
Decide the height so that the unit inlet water
pressure will be 0.5 MPa (168 ftAq) or below
for the tank pressure.
Storage
tank
GB-11
h3
Unit height
L4
L3 (Right/Left) L4 (Between)
1000 + h3
1000 (39-3/8)
(39-3/8 + h3)
Unit inlet water pressure < 0.5 MPa (168 ftAq)
Heat
pump
unit
h2
500
(19-11/16)
L2
Ⓐ