Reliable Model C Installation Operation & Maintenance

Model C
Mechanical
Sprinkler Alarm

Bulletin 613G

Instructions for
Installation, Operation, Care
and Maintenance

Listed by Underwriters Laboratories, Inc.
Approved by Factory Mutual Research
Corporation, and other fire insurance and
governmental agencies in the United
States and foreign countries.

The Reliable Automatic Sprinkler Co., Inc., 525 North MacQuesten Parkway, Mount Vernon, New York 10552

Installation Instructions

The Model C Mechanical Sprinkler Alarm shall be
located as near the alarm (wet), dry or deluge valve as
practicable in order to avoid long runs or many fittings in
the piping. The total length of the pipe should not exceed
75 feet ( 22.9m ) nor shall the mechanical sprinkler alarm
be located over 20 feet (6.1m) above the valve. If
absolutely necessary to exceed 75 feet (22.9 m), the pipe
line to the mechanical sprinkler alarm shall be increased
one or more sizes to compensate for loss of pressure due
to hydraulic friction.

1.

Locate and cut hole in building wall for connecting ¾
(20mm) support pipe of appropriate length wall
thickness plus 1

″ (25mm).

2. Assemble the support pipe to the Wall Plate

(95106603) without removing the Gong (93806612)
and position this assembly on the outside wall with the
support pipe through the wall.

3. Remove the Body Cover (92106603), Cover Gasket

(93706602), and Pelton Wheel (97006603) from the
Body (91006603).

4. Place the Wall Support Washer (96906603) over the

support pipe as shown in the assembly drawing and
screw the Body onto the support pipe until the entire
assembly is aligned and secure to the wall.

5. Slip the Drive Shaft (96206603) thru the support pipe

and into the Drive Shaft Adapter (90086601). Rotate
the drive shaft to make sure it’s properly inserted (the
gong will alarm). Mark and cut the drive shaft where it
projects from the hub in the body.

6. With the drive shaft in place, make sure the Nylon

Bearing (90506603) is in the hub and insert the Pelton
Wheel through this onto the drive shaft. Spin the
Pelton Wheel to ensure that the assembly is free and
that the gong alarms.

7. Replace the Body Cover and Cover Gasket.

8. Connect alarm inlet to the alarm (wet), dry pipe or

deluge valve using galvanized or brass pipe of size
not less than ¾

″ (20mm). An approved ¾ ″ (20mm)

strainer is included for installation near the alarm outlet
of the alarm (wet), dry pipe or deluge valve. When a
retarding chamber is used in connection with an alarm

valve, the strainer shall be located at the outlet of the
retarding chamber unless the retarding chamber is
provided with an approved integral strainer in its outlet.
The piping to the mechanical alarm should be pitched
to allow proper drainage back through the strainer.
Alarm, dry pipe and deluge valve trimmings provide
the proper drain outlet. Refer to respective valve
bulletins for installation of trimmings.

″ (25mm) drain outlet should discharge into an

The 1

open drain.

″

No single mechanical alarm should be connected to
more than three sprinkler systems and they should be
located in the same fire area. A ¾

″ NPT (R¾) swing

check valve must be located in each alarm line near the
junction(s) going to the Mechanical Alarm. This will
assure that water flowing from the alarm port of the
opened Valve will go directly to the water motor. A hole
approximately

1

8″ (3.2mm) diameter should be drilled

through the clapper of each check valve near the center.

Operation

When an alarm (wet), dry pipe or deluge valve is
operated due to fire, water flows through the ¾
strainer, and ¾

″ (20mm) piping that connects the

mechanical sprinkler alarm to the valve. On entering the
mechanical sprinkler alarm inlet, the water passes
through the nozzle and impinges against the gong
producing a continuous piercing alarm. The water, after
impinging against the pelton wheel, drains through the 1
(25mm) drain outlet in the body housing.

The alarm continues to sound as long as water is
flowing through the sprinkler system. It may be shut off
by closing the alarm control valve located in the alarm line
connecting the mechanical sprinkler alarm with the alarm
(wet), dry pipe or deluge valve. Normally, the alarm
control valve must be sealed in the open position.

The Model C Mechanical Sprinkler Alarm is self setting
after each operation, eliminating the need of removing
cover plates, etc. to reset internal mechanisms.

″ (20mm)

″

2.