Hardware Installation
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4-7
4.3.6
Class A Notification Appliance Circuit Installation
For proper operation, you must use polarized notification appliances. Select ANSI output
pattern, if desired. Output is configured as steady (continuous sound) at the factory. See
Section 6 for information on changing the pattern.
Figure 4-8 Class A Notification Circuit
4.4
Alarm and Trouble Relays
The SK-4224 has built-in relays for alarm and trouble. The alarm relay is energized during
any alarm condition. The trouble relay is energized during any trouble or supervisory trouble
condition. Each relay has three terminals (N.O., Common, and N.C.). Refer to Figure 3-1 for
location of these terminals.
4.5
Auxiliary Power Circuit
The SK-4224 has a power limited auxiliary power circuit which can source up to .5A. The
terminal is labeled “AUX PWR”. Refer to Figure 3-1 for location of this terminal.
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