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Control sequence
4-pipe fan coil
Control sequence
2-pipe fan coil with
electric heater
C/O (changeover)
cooling
Control sequence
2-pipe fan coil with
electric heater
C/O (changeover)
heating
Siemens Building Technologies
HVAC Products
YH
Q
H
X
p
4-pipe systems, for controller types ACR12.340/ALG and ACR12.341/ALG
YHE
Q
H
X
p
YH
YHE
Q
X
E
X
H
p
Controller types ACR12.320/ALG / ACR12.340/ALG and ACR12.321/ALG /
ACR12.341/ALG
Q
Heating load
H
Q
Cooling load
K
X
P-band
p
Y
Positioning variable
YH
Heating output with ACR12.32x/ALG + ACR12.34x/ALG c/o activated
YHE
Electric heater output with ACR12.32x/ALG
YK
Cooling output with ACR12.32x/ALG + ACR12.34x/ALG, c/o deactivated
Fan coil controller for wall mounting ACR12
Y [%]
100
80
50
W
W
H
K
X
dz
Y [%]
100
80
50
W
W
H
K
E
X
dz
Y [% ]
100
W
H
p
W
H
W
K
X
PE
YK
X
p
YK
X
p
Heating setpoint
Cooling setpoint
P-band electric heater
CE1N3573E
17.08.2001
Q
K
Q
K
3/10
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