Silent Knight SK-2 Two Zone Fire Alarm Control Panel

A flexible, powerful, cost-effective panel for basic fire protection applications. The SK-2 and SK-2E (SK-2/E) are two zone conventional fire alarm control panels (FACPs) that bring the latest in microprocessor technology to conventional fire controls. The SK-2 is a 120 VAC FACP and the SK-2E is a 240 VAC FACP. These FACPs provide reliable fire signaling protection for small- to medium-sized commercial, industrial, and institutional buildings.

The two zone SK-2 is a 24 VDC FACP that provides two Class B initiating device circuits and one Class B notification appliance circuit (NAC).

The SK-2/E NAC protocol includes the ability to silence audible devices while strobes continue to flash, using only a single pair of wires. The SK-2/E is also compatible with conventional input devices such as two- and four-wire smoke detectors, pull stations, waterflow devices, tamper switches and other normally-open contact devices.

Activation of a compatible smoke detector or any normally-open fire alarm initiating device activates audible and visual signaling devices, illuminates an indicating LED, sounds the piezo sounder at the FACP, activates the FACP alarm relay, and operates an optional module used to notify a remote station or initiate an auxiliary control function.

The SK-2/E is compatible with System Sensor® I3 detectors providing advanced features such as drift compensation, maintenance alert, and freeze warning. Automatic synchronization of audio/visual devices is provided, using three selections for manufacturer protocol.

Features

• Two Style B (Class B) initiating device circuits (IDCs)
• One Style Y (Class B) notification appliance circuit (NAC)
• Support for synchronization of standard ANSI audible signals and ADA compliant strobes per NFPA 72
• Selectable for System Sensor, Wheelock, and Gentex protocols
• Selective silence feature allows manual silence of horns while strobes continue to flash on the same NAC
• Silent or audible walk test operation mode
• Alarm verification selectable per zone
• Program each zone for supervisory or fire with separate red and yellow LEDs
• Disable switches provided per zone
• Program NACS for
  – Silence inhibit
  – Auto silence
  – Strobe synchronization
  – Temporal or steady signal
  – Silenceable or nonsilenceable
  – Disable
• Form C alarm and trouble relays
• 3A total usable current
• Optional dress panel (PN SK-DP2/4)

Electrical Specifications

• SK-2 Primary AC: 120 VAC @ 50/60 Hz, 2.3A
• SK-2E Primary AC: 240 VAC @ 50 Hz, 1.15A
• Wiring: 14 AWG (2.0 mm2) with 600 V insulation min

Initiating Device Circuits (IDCs)

• Operating Voltage: 22 VDC nominal; power-limited
• Standby Current: 4 mA
• Alarm Current: 15 mA min
• Short-circuit Current: 40 mA max
• Loop Resistance: 100¼ max
• EOL Resistor: 4.7K ¼, 1/2 watt

Notification Appliance Circuits (NACs)

• 2.5A @ 24 VDC with standard transformer, power-limited
• Signaling Current: 2.5A max with standard transformer
• EOL Resistor: 4.7K ¼, 1/2 watt

Form C Relays

• Types: Trouble and alarm
• Contact Ratings: 2A @ 30 VAC, resistive

Auxiliary Output

• Resettable
• Operating Voltage: 24 VDC nominal
• Current: 500 mA max, power-limited