Technical data

Figure 3 — Single Interlock Preaction, Component Identification

System Operation

To activate a Reliable Single Interlock System, two inde-

pendent events must coexist before water can flow from the

system to the fire. First, an electrical detector (two detec-

tors in a cross-zoned system) must activate to fill the system

with water, and subsequently, a sprinkler head must open

to discharge water on the fire. When a fire is detected, the

releasing control panel energizes the solenoid valve open

and water flows from the supply through the riser assem-

bly to the system and to the alarm initiating pressure switch.

The valve maintains its open position until the solenoid is

de-energized.

Caution: The solenoid valve must be maintained open to

prevent automatic closing of the Model H Deluge Riser As-

sembly. The Potter PFC-4410-RC Releasing/Control Panel

has a latching feature for this purpose.

After system shutdown, the riser assembly is easily reset

without special tools. Restore detection devices by resetting

or replacing any operated device. Once detection devices

are restored, reset the releasing control panel (see Bulletin

700) and the supply pressure (see Bulletin 507).

Preaction Trim Kit

The Preaction Trim Kit (P/N 6501200112) consists of items

1 through 17. The illustrated (Figure 2) assembly has a

convenient arrangement for draining the sprinkler system

through the Model H Riser Assembly drain line. Assemble

the Preaction Trim Kit using a suitable Teflon-based pipe

thread sealant applied to each male thread. Assemble rigid

couplings by first applying a thin coat of silicone or other

lubricant that does not contain hydrocarbons to the lips and

outside surfaces of the gasket. Position gaskets uniformly on

the valve and adjacent reducers so that all grooves are ex-

posed. Place coupling housings over gaskets and engage

the housing keys in the grooves. Insert bolts and tighten nuts

alternately until housing halves are drawn together uniform-

ly.