5
3 - POSSIBLE TYPES OF ASSEMBLIES
Depending on the indoor airfl ow direction
B1 assembly
Standard
B2 assembly
Economizer, 2 dampers:
fresh air damper
interlocked with return
damper
BP assembly
Plug-fan in return section
BA assembly
Plug-fan in return section
+
Cooling recovery circuit
(active recovery)
B3 assembly (upon request)
Economizer, 3 dampers:
fresh air damper and
exhaust air damper
RS
S’
R’
R’’S’’
BW assembly
Plug-fan in return section
+
Heat recovery wheel
module (passive recovery)
BT assembly
Return top box with
plug-fan or centrifugal fan
BB assembly
Return top box with plug-
fan or centrifugal fan
+
Cooling recovery circuit
(active recovery)
BL assembly (upon request)
Return top box with plug-
fan or centrifugal fan
+
Heat recovery wheel
module (passive recovery)
RS
S’
R’
R’’S’’
F
S’
RS
F
E
RS
F
E
S’
RS
F
E
S’
RS
F
E
S’
R’
S
E
F
S’
R’
S
E
F
S’
F
E
R’
S
S’
Indoor airfl ow direction
0 Lower supply and lower return 3 Lateral supply and lateral return 6 Upper supply and lateral return
1 Lateral supply and lower return 4 Upper supply and lower return 7 Lower supply and upper return
2 Lower supply and lateral return 5 Lateral supply and upper return 8 Upper supply and upper return
Legend
S Lower air supply R Lower air return
S’ Lateral air supply R’ Lateral air return
S’’ Upper air supply R’’ Upper air return
F Fresh air intake E Exhaust air outlet
Note: only one of the three possible options (lower, lateral or upper) can
be selected for both, supply and return.