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4-pipe fan coil
! Important:
2-pipe fan coil
Siemens Building Technologies
HVAC Products
L
B2
B2
PE
L
N Q1 Q2 Q3
M1
3
N
450 VA max.
With 4-pipe applications (ACR12.340/ALG and ACR12.341/ALG), a return air sensor
QAH11 can be connected to terminals B2-M (S9 = off). In this case, the inbuilt
sensor is automatically deactivated.
The c/o or return air sensor input is connected with supply voltage of AC 230 V.
L
B2
B2
PE
L
N
Q1 Q2 Q3
M1
3
N
450 VA max.
B2
Changeover sensor (ACR12.32x/ALG) or return air sensor (ACR12.34x/ALG)
E1
Electric heater
M1
3-speed fan
N1
ACR12.340/ALG or ACR12.341/ALG controller
N2
ACR12.320/ALG or ACR12.321/ALG controller
Q14
Control output for electric heater
S1
Window contact, occupancy detector
Y1
In N1 application, heating valve. In N2 application, cooling or heating valve
(changeover)
Y10
Cooling valve
Fan coil controller for wall mounting ACR12
T
M
DU1
SELV
N Y10
N Y1
Y1
3.5 VA max.
3.5 VA max.
T
DU1 GND
M
SELV
N Q14
N Y1
Y1
3.5 VA max.
12.5 A max.
S1
GND
N1
Y10
S1
N2
+
E1
7/10
CE1N3573E
17.08.2001
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