Applications
234
IDEC SmartRelay Manual
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 de-
vices. This evaluating circuit can be replaced by a single
IDEC SmartRelay unit.
Wiring of an air-conditioning system with FL1C-H12RCC
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
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
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com
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