Instruction manual

7.
40°F (4°C). Note: Heat tracing is not permitted.
Pendent sprinklers, other than dry pendents, used on pre-
action systems shall be installed on return bends per NFPA
13.
The solenoid valve is operated and supervised by the
electrical releasing/control panel. Details on the electrical
portion of this system can be found in Reliable Bulletin 708,
“ Electrical Systems.”
System Air Pressure Requirements
A Reliable Model B Air Compressor Panel or Model C
Pressure Maintenance Device is used to maintain the sys-
tem pneumatic pressure at approximately 35 oz/in
2
(2.2 psi
or 0,2 bar). The air compressor panel contains an integral
low air pressure warning light, while the pressure mainte-
nance device requires a separate annunciating device to be
connected to the low pressure switch. The switch is fac-
tory set to transfer contacts when the supervisory pressure
falls below approximately 11 oz/in
2
(0.7 psi or 0,05 bar). The
pressure maintenance device is a supervisory pneumatic
supply for use where a clean, dependable and continuous
compressed air or dry nitrogen gas source is available in the
40 to 100 psi (2,8 to 6,9 bar) pressure range.
In some circumstances, such as when dry sprinklers are
being used in a preaction system, it may be desirable to su-
pervise the preaction system at air pressures higher than 2
psi. For such cases, Reliable recommends the use of an 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 7psi 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 Preaction System are supervised by the Potter PFC-
4410-RC Releasing Control Panel. Connect these devices
as shown in Fig. 4. The Releasing/Control Panel should
be set to use Program #6 (See Potter Instruction Manual
#5403550).
The power supply, the standby emergency power supply,
battery charger, and the rectifier circuitry are all contained
within the Potter PFC-4410-RC Releasing Control Panel.
The solenoid valve is operated and supervised by the Potter
PFC-4410-RC Releasing Control Panel. Potter PFC-4410-RC
Releasing Control Panel requires 120 VAC.
Batteries that provide ninety hours of standby power are
required for Factory Mutual Approved systems.
For additional information and detailed wiring diagrams,
refer to Reliable Bulletin 700, “ Special Hazards & Special
Systems”. These diagrams describe single area, single area
cross-zoned, and two area systems.
Caution: Repairs or disassembly of the solenoid valve
should only be done by a trained technician. An improperly
repaired or partially assembled solenoid valve could result
in failure of the valve to operate.
Fig. 3