2.2 Power supply specification
A 2250 / 2050 fire alarm panel power supply can source maximum 6A of 24V power including the base draw of main system boards. The
current drawn from optional cards, MX devices, AUX powers and NACs must be subtracted from 6A.
Table 2: 2250 / 2050 system and sub-circuit power limits
Item Current
Maximum AC input 2 A at 120 VAC, 50/60Hz
1 A at 240 VAC, 50/60Hz
Maximum Auxiliary (AUX) supply rating
(Both resettable and non-resettable)
1 A at 24 V
Maximum load on MX loop 0.945 A at 40 V
Maximum alarm load for each NAC 3 A at 24 V
Total load supported with NAC and AUX when Loaded
together
5 A at 24 V
Maximum rated Battery support 25 Ah at 24 V
Important:
1. When using more than one NAC supply in Alarm, total current including all NACs and all AUX must not go beyond 5A. Using entire
5 A on NAC and AUX leaves 1A for MX device, base draw and current drawn from optional cards.
2. Do not exceed 6A limit of power supply rating at any running condition.
3. The 2250 / 2050 back box can accommodate up to two 18 Ah batteries. Batteries up to 25 Ah requires external battery cabinet
(4009-9801).
2.2.1 Battery
2.2.1.1 Battery specification
Use Sealed Lead Acid batteries only.
Maximum battery capacity: 25 Amps Hours.
Maximum charging current: 1.40A.
Standby time- 24hrs
2050 / 2250 Panel can hold maximum two 12 VDC, 18 Ah batteries, of dimension within 184 mm (W) X 86 mm (D) X 168 mm (H) for a single
battery.
Batteries up to 25Ah requires an external battery cabinet: 4009-9801.
2.2.1.2 Battery Replacement Procedure
1. If AC power fails, the system will operate from standby batteries only for a specified time and only if the batteries have been
properly maintained and replaced regularly.
2. This system meets NFPA requirements for operation at 32º to 120º F (0º to 49º C), up to 93% relative humidity at 90º F (32º C).
However, the useful life of the system's standby batteries and the electronic components may be adversely affected by extreme
temperature ranges and humidity.
To replace batteries, ensure you adhere to the following guidelines:
1. Remove the AC power at the breaker from the control unit.
2. Remove insulating cover of the Panel marked with the high voltage warning.
3. Remove red wire from positive terminal from battery.
4. Remove black wire from negative terminal of second battery.
5. Replace with batteries of correct Ah rating.
page 6 579-1404 Rev A
2050 and 2250 Foundation Series Fire Alarm Control Units Installation Guide
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