Maintenance – Edwards Signaling 439DEX User Manual
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P/N P-047550-0587 • REV 6.0 • ISS 04NOV11
Maintenance
Examine the bell annually for accumulation of dirt and clean
when necessary.
WARNING:
To prevent ignition of hazardous atmospheres,
always disconnect all power before opening the conduit outlet
box, servicing, or cleaning the bell. Keep tightly closed when
circuits are energized.
Always perform an operational test on this product on a regular
basis after installation. Edwards suggests that this regularly
scheduled testing be performed at least once a year, or more
often as may be dictated by the local authority having
jurisdiction.
Figure 1: Wiring
Figure 2: Mounting hole dimensions
Figure 3: Wiring the 438DEX AC bells
Note:
DC supervisory polarity shown. On alarm, voltage switches
to 120 VAC.
Figure 4: Wiring the 439DEX DC bells
Note:
DC supervisory polarity shown. On alarm, polarity reverses.