Technical data

4.
Figure 2 — Single Interlock Preaction Assembly
System Supervising Pressure Requirements
- Cont’d
In some circumstances, such as when dry sprinklers are
being used in a preaction system, it may be desirable to
supervise the preaction system at air pressures higher than
7 psi. For such cases, Reliable recommends the use of the
NS-Pak or a Model A-2 air maintenance device with either
a System Sensor EPS-10 or EPS-40 low air pressure switch.
Supervising air pressure may be between 7 psi and 20 psi,
depending on which low air pressure switch is being utilized.
System Electrical Requirements
All releasing, alarm and detection devices in the Single In-
terlock System are supervised by the Potter PFC-4410-RC
Releasing/Control Panel. Typical connection of these devic-
es is shown in Figure 1. The power supply, standby emer-
gency power supply, battery charger and rectifier circuitry
are all contained within the Panel. Batteries that provide
90 hours of standby power are required in FM Approved
systems. For additional information and detailed wiring dia-
grams, refer to Reliable Bulletin 700.
Item
No.
Part No. Description
No.
Req’d
1 6107020000 Valve, Riser Check, 2½” Model G 1
2 98050002 Reducer, 2½” Grv. x 2” NPT, 2¾” Lg. 1
3 98050003 Reducer, 2½” Grv. x 1½” NPT, 2¾” Lg. 1
4 98543234 Nipple, ¾” x 3½” Lg. (Galv.) 1
5 98543231 Nipple, ¾” x 3” Lg. (Galv.) 1
6 98543279 Nipple, ¾” x Close (Galv.) 1
7 98815202 Union, ¾” (Galv.) 1
8 98840113 Valve, Angle, ¾” 1
9 750510100 Coupling, Rigid, 2½” NPT 2
10 98048035 Bushing 1¼” x ¾” 1
11 98614403 Plug, ¼” (Galv.) 1
12 98543212 Nipple ½” x Close (Galv.) 1
13 98543220 Nipple, ¼” x 3” Lg. (Galv.) 1
14 98048000 Bushing, Reducer, ½” x ¼” (Galv.) 1
15 98761651 Tee, ½” (Galv.) 1
16 98840160 Valve, 3-Way Gauge, ¼” 1
17 98248000 Gauge, Air Pressure 1
18 6501200112 Preaction Trim Kit 1
19 6503003001 Model H Riser Assembly