iSMA-B-FCU /FCU Hardware
Version 1.1
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WARNING! HTG relay voltage is always limited to 250 V AC, irrespectively of the power supply
version of the FCU controller.
WARNING! This digital output is equipped with a separate circuit with 10
A relay. This circuit
requires using external fuse protection up to 10
A. The current higher than 10
A may permanently
damage device and cause danger to the user and to the equipment!
Figure 19 Digital Output O4, exemplary Electrical Heater connection
4.2.3 O5 – CLG relay “Electrical Cooler”
ISMA-B-FCU device is equipped with a relay output, which in FCU application is dedicated to an
external Cooler. This relay output is internally connected to the power supply, therefore there is no
need to connect external supply. In iSMA-B-FCU-HH and iSMA-B-FCU-HL the output voltage in high
state is 230 V AC, and in iSMA-B-FCU-LL version the high state voltage is 24 V AC. Current
consumption cannot exceed 6 A. An exemplary way of connecting is presented in the figure below.
WARNING! Output O4 and outputs O1-O3 are protected by a 6 A fuse. Total current for digital relay
outputs cannot exceed 6A.
WARNING! It is forbidden to use a fuse with current exceeding 6A! Higher current may permanently
damage the device and cause a danger to the user and to the equipment!
