SILENT KNIGHT 4224 Installation Manual
Content
Section 1
Overview
1.1 SK-4224 Description ................................. ..... ...... ....................................................................................1-1
1.2 How to Contact Silent Knight ..................................................................................................................1-1
......................................................................................................................................................1-1
Section 2
Agency Requirements
2.1 FCC Warning ...........................................................................................................................................2-1
2.2 Underwriters Laboratories (UL) ..............................................................................................................2-1
2.2.1 Requirements for All Installations ....................................................................................................2-1
2.2.2 Requirements for Local Protected Fire Alarm Systems ...................................................................2-1
............................................................................................................... 2-1
Section 3
Before You Begin Installing
3.1 What's in the Box? ...................................................................................................................................3-1
3.2 Optional Accessories ................................................................................................................................ 3-2
3.3 SK-4224 Board Layout ................. ...... ...... ...............................................................................................3-3
3.4 Electrical Specifications ...........................................................................................................................3-4
3.5 Environmental Specifications ..................................................................................................................3-4
3.6 Mounting the SK-4224 .............................................................................................................................3-5
3.7 Assembly ..................................................................................................................................................3-6
3.8 Wiring Specifications ...............................................................................................................................3-7
3.9 Calculating Current Draw and Standby Battery ......................................................................................3-8
3.9.1 Worksheet Requirements ......................................... .........................................................................3-8
Filling in the Current Draw Worksheet, Table 3-6 (Section 3.9.3) ............................................... 3-8
3.9.2 Maximum Battery Standby Load ......................................................................................................3-8
3.9.3 Current Draw Worksheet ..................................................................................................................3-9
...............................................................................................3-1
Section 4
Hardware Installation
4.1 AC Power ................................................................................................................................................. 4-1
4.2 Battery Connection ..................................................................................................................................4-2
4.3 Initiation Circuit Installation ....................................................................................................................4-3
4.3.1 Contact Wiring ..................................................................................................................................4-3
4.3.2 Two-Wire Smoke Detector Wiring ................................................................................................... 4-3
4.3.3 Class A Smoke Detector Installation ................................................................................................4-4
4.3.4 Four-Wire Smoke Detector ............................................................................................................... 4-5
4.3.5 Notification Circuit Installation ........................................................................................................ 4-6
4.3.6 Class A Notification Circuit Installation ..........................................................................................4-7
4.4 Alarm and Trouble Relays .......................................................................................................................4-7
4.5 Auxiliary Power Circuit ...........................................................................................................................4-7
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Model SK-4224 Fire Control Panel Installation/Operation Manual
4.6 Door Release Wiring ................................................................................................................................4-8
4.7 Optional Accessories Installation .............................................................................................................4-9
4.7.1 Installing the Serial Driver Board (Model SK-2884) .......................................................................4-9
Wiring the SK-2884 to an Expansion Device .............................................................................4-10
4.7.2 SK-2865 LED Annunciator Installation .........................................................................................4-10
SK-2865 Electrical Specification ...................................................... ..... ...... ............................. ..4-10
Wiring the SK-2865 to the SK-2884 ...........................................................................................4-10
Setting the SK-2865’s address .................................................................................................... 4-12
Mounting the SK-2865 ................................................................................................................4-12
Section 5
Notification Expansion Mode
5.1 Class A Notification Expansion Wiring ...................................................................................................5-1
5.2 Class B Notification Expansion Wiring ...................................................................................................5-2
...........................................................................................5-1
Section 6
System Configuration
................................................................................................................6-1
Section 7
System Operation
7.1 Meaning of LEDs .....................................................................................................................................7-1
7.2 Operation Keys (Switches) ......................................................................................................................7-3
............................................................................................................................7-1
Appendix A
Compatible Devices
A.1 Smoke Detectors ..................................................................................................................................... A -1
A.1.1 Enhanced Mode ............................................................................................................................ A-1
A.1.2 Two-Wire Smoke Detectors .........................................................................................................A-2
Four-Wire Smoke Detectors ......................................................................................................... A-3
A.2 Notification Appliances .......................................................................................................................... A-4
..................................................................................................................... A-1
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Section 1
Overview
1.1 SK-4224 Description
The Model SK-4224 is a four zone, 24-volt fire control panel having the following features:
• Zone inputs can be configured as:
Four Class B zones
Or
Two Class A zones
• 2.5 amp power supply
• Two notification circuits rated at 2.5 amp max.
• Dedicated alarm and trouble relays
• Auxiliary power output (.5 amp max.) for powering special applications, such as door
holders.
• Enhanced Verification Mode, a built-in feature that distinguishes two-wire smoke detectors from pull stations.
• Housed in a 12.75"W x 15"H x 3.25"D metal cabinet
• Cabinet supports two 7.0 AH backup batteries
1.2 How to Contact Silent Knight
If you have a question or encounter a problem not covered in this manual, contact Silent
Knight Technical Support at 800-328-0103 (or 612-493-6455). To order parts, contact Silent
Knight Sales at 800-446-6444 (or 612-493-6435).
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Model SK-4224 Fire Control Panel Installation/Operation Manual
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Section 2
Agency Requirements
2.1 FCC Warning
This device has been verified to comply with FCC Rules Part 15. Operation is subject to the
two following conditions: (1) This device may not cause radio interference, and (2) This
device must accept any interference received, including interference that may cause undesired
operation.
2.2 Underwriters Laboratories (UL)
The SK-4224 is UL listed as a control unit for use in NFPA 72 systems. If the SK-4224 and
its accessories are to be used as part of a UL installation, carefully read the UL requirements
in this section. For more information on NFPA 72 standards, refer to the NFPA National Fire
Alarm Code, 1996 Edition.
2.2.1 Requirements for All Installations
General requirements are described in this section. When installing an individual device,
refer to the specific section of the manual for additional requirements.
1. All field wiring must be installed in accordance with NFPA 70 National Electric Code.
2. Use UL listed smoke detectors and notification appliances compatible with the SK-4224
from those specified in the Appendix to this manual.
3. If you are using the smoke verification feature:
• Do not use smoke detectors with built-in alarm verification.
• Select "Enhanced Mode" if the installation includes pull stations or water flow
switches.
4. A full system checkout must be performed any time the panel is programmed.
5. UL installations using Class B wiring require the use of a Model 7628 EOL resistor
assembly.
2.2.2 Requirements for Local Protected Fire Alarm
Systems
At least one UL listed supervised notification appliance must be used.
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Model SK-4224 Fire Control Panel Installation/Operation Manual
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Section 3
g
Before You Begin Installin
3.1 What's in the Box?
The Model SK-4224 ships with the following hardware:
Table 3-1: Contents of Shipping Box
Containing
Main Part
Part Quantity/Item
1 Cabinet 122509
Panel Bag 1 Control Board 204224
1 Installation Manual 151068
2 #8 Screws 119152
2 #8 Nuts 119538
Hardware Bag
120 Vrms @ 60Hz 115061
1 Transformer
230 Vrms at 50Hz 115031
1 Viewing Bezel 122508
3 Self-tapping Scr e ws 119296
1 Earth Ground Wire 140668
1 Battery Wire Harness 130420
1 battery Jumper 140694
or a
Model
Number
6 End-of-line Resistors 111682
Note: See Section 3.7 for assembl y i nstructions.
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Model SK-4224 Fire Control Panel Installation/Operation Manual
3.2 Optional Accessories
Table 3-2 is a list of optional accessories that can be used with the Model SK-4224 Fire
Control Panel.
Table 3-2: Option Accessories for the SK-4224
Model
Number
SK-2884 Serial Driver Board Used to interface all SK-4224expansion device to the SK-
*SK-2880 Input/Output (I/O) Module Used to drive customized annunciators and interface devices.
*SK-2865 LED Annunciator Remote LED annunciator with Silence and Reset keyswitch
*SK-2104 Diale r Used to communicate alarms, tr ouble and supervisories to
7628 UL listed End-of-line
(EOL) Resistor.
Name Description
4224 panel. Supports1 Dialer (Model 2104) and any
combination of 4 LED Annunciators (Model 2865) or I/O
Modules (Model 2880).
inputs.
central station. Offe rs 5 different reporting f ormats 3/1, 4/2,
BFSK, SIA, and Contact ID.
EOL resistor required for UL installations.
* Require a SK-2884 to operate with the SK-4224 control panel.
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Before You Begin Installing
3.3 SK-4224 Board Layout
Figure 3-1 shows the SK-4224 circuit board including location of terminals, connectors, dip
switches, and LEDs.
Programming
DIP Switches
AC Power
Connector
On-Board
Piezo Sounder
Annunciator
SK-2884
Serial
Interface
Connector
Backup
Battery
Connector
Zone Inputs
4 Class B or
2 Class A Inputs
Figure 3-1 Model SK-4224 Layout
2 Notification
Appliance
Circuits
Notification
Expansion
Inputs
Trouble &
Alarm Relays
Auxiliary
Power
Output
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Model SK-4224 Fire Control Panel Installation/Operation Manual
3.4 Electrical Specifications
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
Note: * When ordering, specify your voltage requirements.
3.5 Environmental Specifications
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
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)
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Before You Begin Installing
3.6 Mounting the SK-4224
Read the environmental specifications in Section 3.5 before mounting the cabinet.
The panel should be accessible to main drop wiring runs. It should be mounted as close to the
center of the building as possible and located within a secured area, but should be accessible
for testing and service. End-users responsible for maintaining the panel should be able to hear
alarms and troubles. When selecting a location, keep in mind that the panel itself is the main
source of alarm and trouble annunciation.
Mount the cabinet so it is firmly secured to the wall surface. When mounting the cabinet on
concrete, especially when moisture is expected, attach a piece of 3/4-inch plywood to the
concrete surface and then attach the cabinet to the plywood. Also mount any other modules to
the plywood.
Follow these steps to mount the control panel cabinet:
1. Place the cabinet on the mounting surface, level the cabinet and mark the top two
mounting holes.
2. Screw the top two mount screws about 3/4 of the way into the mounting surface.
3. Hang the control panel cabinet on the top mounting screws through the top mounting
screw keyholes.
12-1/2”
11”
Top Mounting
Screw Keyholes
15”
Bottom
Mounting Holes
4. Insert the bottom two mounting screws into the cabinet’s bottom mounting holes.
5. Tighten all four mounting screws until the cabinet is properly secured.
6. Insert all cabinet components. See Section 3.7.
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Figure 3-2 Cabinet Mounting Holes
Model SK-4224 Fire Control Panel Installation/Operation Manual
3.7 Assembly
The components listed in Table 3-1 are all packed with in the cabinet and require some
assembly. Follow these steps to assemble the cabinets inside the cabinet:
1. Remove keys from small manila envelope taped to the top of the cabinet.
2. Unlock the cabinet door.
3. Remove the packing material and the SK-4224 components.
4. Snap the bezel into the opening in the front of the cabinet. See Figure 3-3.
Side View of
Transformer
Installation
Slotted Stand-Off
Bezel Insertion
CPU Mounting
Screws
Figure 3-3 Assembly Diagram for the SK-4224
Note: The bezel will fit in only one way.
5. With the t wo #8 Screws and the two #8 nuts (with built in washers), mount the transformer
in the holes in the upper left hand corner of the cabinet. See Figure 3-3.
6. With the three Self-trapping screws mount the control board on the cabinet stand-offs.
Note: See Section 4 for transformer connections and battery connections.
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Before You Begin Installing
3.8 Wiring Specifications
Induced noise (transfer of electrical energy from one wire to another) can cause false alarms
or interfere with control panel operation in other ways.
To avoid induced noise, follow these guidelines:
• Isolate input wiring from high current output and power wiring. Do not pull one multiconductor cable for the entire panel. Instead, separate the wiring as follows:
High current input/output: AC power and notification device wiring
Low current input/output: Annunciator and zone loop wiring
• Do not pull wires from different groups through the same conduit. If you must run them
together, do so for as short a distance as possible or use shielded cable. Connect the shield
to circuit ground at the panel. You must route high and low voltages separately.
• Route the wiring within the cabinet around the perimeter of the cabinet. It should not cross
the printed circuit board where it could induce noise into the sensitive microelectronics or
pick up unwanted RF noise from the high speed circuits. See Figure 3-4 for an example.
• High frequency noise, such as that produced by the inductive reactance of a speaker or
bell, can also be reduced by running the wire through ferrite shield beads or by wrapping it
around a ferrite toroid.
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Figure 3-4 Wire Routing Example
Model SK-4224 Fire Control Panel Installation/Operation Manual
3.9 Calculating Current Draw and Standby Battery
This section is for helping you determine the current draw and standby battery needs for your
installation.
3.9.1 Worksheet Requirements
The following steps must be taken when determining SK-4224 current draw and standby
battery requirements.
Filling in the Current Draw Worksheet, Table 3-6 (Section 3.9.3)
1. For the SK-4224, the worst case current draw is listed for the panel and is recorded in the
table at Line A.
2. Add up the current draw for all smoke detectors and record in the table at Line B.
3. Add up all notification appliance loads and record in the table at Line C.
4. Any additional devices should be recorded at Line D.
5. Make sure that the alarm current without the panel (Lines B-D) does not exceed 2.5 A.
The total alarm current (including the panel, Lines A-D) should not exceed 2.75 A.
6. Complete the remaining instructions in Table 2 for determining battery size requirements.
3.9.2 Maximum Battery Standby Load
Table 3-5 shows the maximum battery standby load for the SK-4224 based on 24 hours of
standby. The standby load calculations of line D in the Current Draw Calculation Worksheet
(Table 3-6) must be less than the number shown in Table 3-5 for the battery size used and
standby hours required.
Table 3-5: Maximum Battery Standby Load
Rechargeable Battery Size
7 AH 270 mA
Max. Load for 24 hrs.
Standby, 5 mins. Alarm
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Before You Begin Installing
3.9.3 Current Draw Worksheet
Use this worksheet to determine current requirements during alarm/battery standby operation.
(Copy this page if additional space is required.)
Table 3-6: Current Draw Calculations
Device
For each device, use this formula: This Column X This column = Current per number of devices
SK-4224 Panel 1
A Current Subtotals:
Smoke Detectors
B Current Subtotals:
Notification Devices
C Current Subtotals:
Accesory Devices
SKC-2884
SKC-2865
D Current Subtotals:
*Additional Devices
E Current Subtotals:
Total current rating of all devices in system (add A throug h E): mA mA
F
Total current ratings converted to amperes (x .001): A A
Number of
Devices
Refer to device manual for current ratings. See Appendix to this manual for
max. # per loop.
Refer to device manual for number of devices and current ratings.
Current per Device
Standby: 125 mA 125 mA
Alarm: 250 mA 250 mA
Standby: mA mA
Alarm: mA mA
Standby: mA mA
Alarm: mA mA
Standby: mA mA
Alarm: mA mA
Alarm: mA mA
Alarm: mA mA
Alarm: mA mA
Alarm: mA mA
Standby: 10 mA mA
Alarm: 10 mA mA
Standby: 35 mA mA
Alarm: 75 mA mA
Standby: mA mA
Alarm: mA mA
Standby: mA mA
Alarm: mA mA
Standby
Current
125 mA 250 mA
mA mA
mA mA
mA mA
mA mA
Alarm
Current
*Note:If you are usin g do or ho lders, you do not need t o consider door holde r current for alarm/ba tt er y s ta ndb y,
because power is removed during that time. However, during normal operation, door ho lders draw current
and must be included in the total current that can be drawn from the pane l.
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Model SK-4224 Fire Control Panel Installation/Operation Manual
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Section 4
Hardware Installation
4.1 AC Power
At installation, connect the transformer AC inputs to the AC power source as shown in Figure
4-1. It may be necessary for a professional electrician to make this connection.
The AC inputs are rated as 120 VAC, 60 Hz (for transformer P/N 115061) or 230 VAC,50 Hz
(for transformer P/N 115031). See Table 3-1 for more information.
To AC
Power
White
Black
Green
Earth Ground
Transformer
Figure 4-1 AC Power Connection
Yellow
AC Power
Connector
Control Panel
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Model SK-4224 Fire Control Panel Installation/Operation Manual
4.2 Battery Connection
The SK-4224 battery charge capacity is 7.0 AH. Use two 12V batteries of the same AH rating.
Determine the correct AH rating as per your current load calculation (see Table 3-6).
Wire batteries in series to produce a 24-volt equivalent. Do not parallel batteries to increase
the AH rating.
Note: The SK-4224 cabinet supports two 7.0 AH batteries.
Backup Battery
Connector
Figure 4-2 Battery Connection
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