ADT Unimode 4520 | How to do AC/DC Voltage Testing | NFPA 72 2025 Edition

This video will go over how to do the AC/DC Voltage Testing for the ADT Unimode 4520 fire alarm panel. NFPA 72 - 2025 Edition 10.3.5 Equipment shall be designed so that it is capable of performing its intended functions under the following conditions: (1) * At 85 percent and at 110 percent of the nameplate primary (main) and secondary (standby) input voltage(s) (2) At ambient temperatures of 32°F (0°C) and 120°F (49°C) (3) At a relative humidity of 85 percent and an ambient temperature of 86°F (30°C) Table 14.4.3.2, Component 9(2): Charger Test Test Frequency - Semiannually With the battery fully charged and connected to the charger, measure the voltage across the battery with a voltmeter. Verify the voltage is within the battery/alarm equipment manufacturer's recommendations. If the voltage is outside of the specified limits, either adjust the charger to within limits or replace the charger. If the charger is adjustable, adjust the output voltage to 2.265 volts, +/- 0.015 volts, per cell at 77°F (25°C) or as specified by the alarm equipment manufacturer. Multi-Meter https://www.kleintools.com/catalog/mu...