Installation
Power Supply Connections
COM
24VAC
2 A
240-120/24VAC
Transformer
Add 24VAC transformer
when the power is not
supplied by the equipment
Always protect
your circuit with a
2 A fuse
Wire size based on VA rating and distance from Power source
The BW437 must be powered using a
Class 2, 24Vac transformer. When
powering from a 24Vac transformer, do not
ground either side of the transformer’s
secondary
For details on grounding within control
panels, NFPA 79 and UL508A provide the
required details.
WARNING: Internally, this device utilizes a half-wave rectifier and
therefore can only share the same AC power source with other half-
wave rectified devices. Sharing AC power with full wave rectified
devices is NOT recommended. If not properly wired, connecting
controllers on an MSTP BACnet network that have internal full wave
rectifier controllers with Onyxx LX half-wave controllers can have
adverse effect on network communications and in some cases would
result in damaging the Onyxx LX Controllers. Not properly wiring
the devices will void the warranty.
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