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Introduction to the Charger Specifications
2
CHG-120 Instruction 11/22/04 PN: 52459:A FCI P/N:9000-0572
The charger also provides the following features:
• AM-1 ammeter (0-10A) ordered separately
• VM-1 voltmeter (0-50 V) ordered separately
• Disable local ground fault detection
• Selectable loss of AC delay (8 or 16 hours)
Specifications
Table 1 contains electrical specifications for the charger:
Compliance with NFPA Codes and UL Standards
The charger complies with the following standards:
• NFPA 72-1993 National Fire Alarm Code
• UL 864 Standard for Control Units for Fire Alarm Systems and UL 1481 Power
Supplies for Fire Alarm Systems
• CAN/ULC-S527-M87
Charger Maintenance
The charger does not require regular maintenance. While installing the charger, however,
make sure to maintain proper polarity when connecting power leads and battery
connections. To ensure optimal operation of the charger, observe the following:
Overload and reverse-polarity protection Fuses F1, F2 and F3 (15 A, PN
12057) provide
overload and reverse-polarity protection. Replace a blown fuse with a fuse with the same
rating and type.
Periodic Inspection Periodically inspect the batteries for corrosion and make sure that
corrosive effects to the batteries do not affect the charger or cabinet.
Troubleshooting Most problems with a charger are due to faulty batteries or loose
connections. If you encounter problems, inspect the charger, the battery, and all
connections for loose wiring or short circuits.
Replacing Batteries Only replace batteries with the same charge rate and capacity as
other batteries in the set. For example, if replacing one of four 60 AH batteries, make sure
the replacement battery has the same charge rate and capacity as the other three batteries.
Primary AC power in (TB1) 120 VAC, 60 Hz, 2 A
240 VAC, 50 Hz, 1 A
Form-C relay (TB3) 5 A at 30 VDC
Float charge voltage 27.6 VDC
Maximum charging current 4.5 A
Fuses F1-F3 (PN 12057) 15 A
Battery sizes 25 AH to 120 AH
Charging Time (to charge two fully discharged
batteries
25 AH – 9 hours
55 AH/60 AH – 20 hours
120 AH – 38 hours
Table 1 Charger Specifications