SilentKnight SK-5208 Conventional FACP 10-30 Zone - Manual (Page 21)

Model SK-5208 Installation Manual 151204
3-11
zones. These zones must be wired using normally open contacts.
Figure 3-5 Class A (Style D) Supervised Fire Circuit
Maximum voltage: 17.5 to 28 VDC Full Wave Rectified
Circuit Current: 95 mA
Maximum circuit Resistance: 50 ohms
3.11.2 Class B (Style B) Zones
Zones 3 through 10 are Class B (Style B) only fire zones. Zones 1 & 2 may also be programmed as Class A
(Style D) or Class B (Style B), see Section 4.2.2 for zone 1 & 2 zone programming.
Each Class B zone consists of a two-wire circuit that will detect the occurrence of an open in the circuit, but may
not be able to detect an alarm after such an occurrence. The detection of an open will cause the audible trouble
signal to sound and the SK-5208 will report the trouble to the central or remote station (if programmed to do so).
Figure 3-6 shows how to wire a Class B (Style B) circuit. One side of each Class B circuit connects to a zone
input terminal and the other side of each circuit connects to Smoke power. For each circuit, use a 4.7K-ohm EOL
resistor wired in parallel with the normally open contact farthest from the panel.
Figure 3-6 Model SK-5208 Class B (Style B) Circuits
Supervised
Power Limited
Supervised
Power Limited
4.7 k
 EOL
UL Listed
Model 7628
Note: Zones 1 and 2 can be
configured as either Class A
or Class B. See also Section
3.11.1.