IDEC FL1E-H12RCA User Manual page 291

The circuit diagram for conventional solutions is as follows:
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 requires 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
IDEC SmartRelay Manual
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L1
S0
S1 K1
K5 S2
S2
v >
K1 K2 K3
N
Exhaust air
L1
S1 S0 S2
v>
L1 N I1 I2 I3 I1 I2 I3 I4 I1
1 2 1 2 1
Q1 Q2 Q3
K1 K2 H1
N
Exhaust 
Fresh-air
fan fan
Auxiliary circuit
K2
S3 v >
K4 K5
H1
Fresh air Operation
S3 v>
I5 I3 I6 I7 I8
2 1 2
Q4
H2
Applications
K4 K5
H2
Error
277