Viking Water Motor Gong | Model F-2 | 8 in. | 07862

• View technical specifications
• What does this contain?
• Where are these required or used?
• How do I assemble this water motor gong?

What does this water motor gong assembly contain?

The Viking Model F-2 Water Motor Gong is a fire alarm bell that requires no electricity. This mechanical device sounds when water passes through the 3/4 in. NPT inlet, rotating a striker to produce a 90-decibel alarm.

This complete water motor gong assembly contains almost everything needed to sound an alarm just add pipes and fittings. Each Viking Model F-2 ships with:

• A motor assembly with a brass nozzle and a cast-iron housing
• A striker arm assembly featuring a stainless-steel arm, pin, and washer
• One 3/4 in. brass strainer for the alarm line
• One 16-3/4 in. stainless steel drive shaft

If the wall is less than 3 in. thick, this gong requires an extension mounting cup. If the wall ranges from 14 in. to 30 1/4 in. thick, an extension shaft is needed. Viking also offers a closure plate to protect gongs mounted on uneven walls against nesting birds and other intrusions. To place a special order for these components, call (888) 361-6662.

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Where are these required/used?

Water motor alarms or electric fire alarm bells are required for any NFPA-13-compliant fire sprinkler system that has more than 20 sprinklers. Most often, Viking's #07862 Water Motor Gong works as a waterflow alarm. These alarms are typically placed on a building's exterior wall, and often guide firefighters to fire department connections (inlets used to supply water to a building's fire sprinkler system).

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How do I assemble and install Viking's water motor alarm?

For a detailed look at this water motor gong's installation requirements, consult Viking's instruction manual.Typical assembly for the Model F-2 is as follows:

• Cut a hole no larger than 1 5/8 in. in the building's wall.
• Cut and thread a 3/4 in. galvanized spacer pipe (used to protect gong components). If Viking's extension mounting cup (sold separately) is used, cut the pipe 2 in. longer than the wall is thick. If no cup is used, cut the pipe 1 in. shorter than the wall is thick.
• Cut the drive shaft. If using an extension cup, make the shaft 5 3/4 in. longer than the wall's thickness. Otherwise, cut it 2 3/4 in. longer than the wall is thick.
• File the drive shaft to provide a 3/32 in. (2.4 mm) x 450 chamfer on both corners of both ends.
• Slide the spacer pipe over the shaft and thread the end of the spacer pipe into the gong support assembly coupling.
• Slide the closure plate (sold separately) against the gong's back. Secure with a 9/32 in. fastener if needed.
• Slide the free end of the space pipe into the hole of the support assembly.
• Slide the wall plate over the free end of the spacer pipe.
• Remove the thread protectors from the water motor and attach it to the spacer pipe.
• Attach the gong, flat washer, and label to the gong support with the included 12 in. screw.
• Connect the water motor inlet to the alarm outlet of a waterflow detection device. Install the 3/4 in. strainer on the line as close to the alarm outlet as possible.

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Specifications