Specifications

Model SK-4224 Fire Control Panel Installation/Operation Manual
3-4 151068
3.4 Electrical Specifications
Note: * When ordering, specify your voltage requirements.
3.5 Environmental Specifications
It is important to protect the SK-4224 control panel from water. To prevent water damage, the
following conditions should be AVOIDED when mounting the units:
• Do not mount directly on exterior walls, especially masonry walls (condensation)
• Do not mount directly on exterior walls below grade (condensation)
• Protect from plumbing leaks
• Protect from splash caused by sprinkler system inspection ports
• Do not mount in areas with humidity-generating equipment (such as dryers, production
machinery)
Table 3-3: Electrical Specifications
Circuit Rating
Primary AC *120 Vrms at 60 Hz, or 230 Vrms at 50 Hz
@ 1.5 Amps
Total External DC Load 2.5A @ 24 VDC
+24V Auxiliary Power 19.8 V to 28.0 V, 0.5 A max.
Trouble & Alarm Relays 2.5 A @ 30 VDC resistive
Notification Appliance Power 19.8 V to 28.0 V, 2.5 A max.
Smoke Detector Power 19.8 V to 28.0 V, 1.0 A max.
Battery Charging Voltage 27.0 - 27.6 V
Maximum Battery Charging Current 750 mA
Minimum Low Battery Detect 20.4 V
Minimum Low AC Detect 100 Vrms at 60 Hz, full load
Table 3-4: Environmental Specifications
Storage Temperature: -4° - 167° F (-20 - 75° C)
Operating Temperature: 32° - 120° F (0° - 49° C)
Humidity: 10 - 85% non-condensing