User Manual

Applications
IDEC SmartRelay Manual 277
The circuit diagram for conventional solutions is as follows:
K1 K5
K5
S1
S0
K3K2
L1
N
S2
K1
v
>
S2
H1
K4
S3
v
>
K5
H2
K2 K4
Auxiliary circuit
Exhaust air Fresh air Operation Error
The fans are monitored by means of flow sensors. If no air
flow is registered within a short waiting time, the system is
switched off and an error message is output. This message
can be acknowledged by pressing the OFF button.
In addition to the flow sensors, the fan monitoring system
also r
equires an evaluating circuit with several switching
devices. This evaluating circuit can be replaced by a single
IDEC SmartRelay unit.
Wiring of an air-conditioning system with FL1E-H12RCC
L1 N I1 I3 I6 I7 I8
Q1 Q2 Q3 Q4
K1 K2
S1
L1
N
S2 S3
v>
v>
H1 H2
S0
I4 I5I1 I2 I3I1 I2 I3
1 2 1 2 1 2 1 2
Exhaust 
fan
Fresh-air
fan