Installation, Operation and Maintenance Manual
8221 RevD 08-18
10
Form C Dry Contact and Audible Alarm Option
Similar to the green LED above, the Dry Contact will change state and the Audible Alarm will sound
upon any suppression element failure. The Audible Alarm may be silenced by removing power to the
SPD.
Maintenance
SPDs require minimal maintenance. We recommend periodic inspection of diagnostic indicators to
ensure proper operation. We also recommend keeping the SPD clean as appropriate.
Troubleshooting & Service
Please contact us for any service related issues. We want to take care of any problems.
Quality SPDs withstand severe duty and attempt to protect their load until failure. There are electrical
anomalies that SPDs cannot protect against. These are generally Sustained Overvoltages also known
as Temporary Overvoltages (TOVs). In this context, Sustained Overvoltages may be only a few cycles.
Failed SPDs tend to be symptoms, not root causes. We suggest treating a failed SPD as a ‘canary in
the coal mine’ as there may be larger issues at play. As a generalization, the single largest ‘killer’ of
SPDs is reference to ground issues. If the SPD shows problems on startup, there is reasonable chance
of bonding/grounding/misapplication issue. This permanently damages the unit. If not corrected, it
will happen again.
There are no user serviceable parts inside. The S50A is ultrasonically welded closed. We strongly
recommend against disassembly.
Units may be returned to the factory for factory service, qualification and return. Please contact factory
at (800) 727-0669 for assistance.
Any returns need a Return Authorization (RA) number.
Hazardous voltage.
Will cause death or serious injury.
Keep Out.
Qualified personnel only.
Disconnect and lock off all power before
working on this equipment.
V
DANGER
