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Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
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The enclosure-mounted circuit boards differ between the LBW-
420/-2 and the LBW-420-1 to accommodate the differing power
connections. All other connections are identical. The Enclosure
Mounted Circuit board contains the relays, output contacts and
termination points for connecting to external equipment. When the
detector enclosure is open, this circuit board is on the rear wall of
the enclosure. The enclosure-mounted circuit board is shown in the
following two pictures and described in detail below.
NOTE:
This
detector does not support a 4 to 20mA output for the temperature
sensor.
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Power for the LBW-420 must be a nominal 115 Volt AC circuit.
Power for the LBW-420-2 must be a nominal 230 Volt AC circuit.
Power is connected to terminal block J2. A safety ground terminal
is also provided on terminal block J2.
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Power for the LBW-420-1 must be a DC voltage between 18 and 30
volts with a current rating of at least 0.5 amps at 24 volts. Power is
connected to terminal block J2.
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Jumper J3 (ammonia signal) configures the LBW-420-1 to use
either an external power supply for the Ammonia 4-20 mA circuit
or to use an on board 18 to 30-volt DC supply for the 4-20 mA
circuits.
