Operation
When the Series DS-1 is in service,
water is prevented from entering the
assembly by the Plug & Belleville Seal-
ing Assembly (Ref. Figure 1) in the
Inlet of the Sprinkler. The glass Bulb
contains a fluid that expands when ex-
posed to heat. When the rated tem-
perature is reached, the fluid expands
sufficiently to shatter the glass Bulb,
and the Bulb Seat is released. The
compressed Spring is then able to ex-
pand and push the Water Tube as well
as the Guide Tube outward. This action
simultaneously pulls inward on the
Yoke, withdrawing the Plug & Belleville
Seal from the Inlet allowing the sprin-
kler to activate and flow water.
Design
Criteria
The
Series DS-1 Sprinklers are in-
tended for use in fire sprinkler systems
designed in accordance with the
standard installation rules recognized
by the applicable Listing or Approval
agency (e.g., UL Listing is based on
NFPA 13 requirements).
The Series DS-1 Dry Type Sprinkler is
to be installed in the 1 or 3/4 inch NPT
outlet or run of malleable or ductile iron
threaded tee fittings that meet the di-
mensional requirements of ANSI
B16.3 or cast iron threaded tee fittings
that meet the dimensional require-
ments of ANSI B16.4 with the end
sprinkler fitting on a branch line to be
plugged as shown in Figure 1.
When
installing 1 inch NPT Series
DS-1 Dry Type Sprinklers on a dry pipe
sprinkler system, only use the side out-
let of maximum 2-1/2 inch size reduc-
ing tee’s. When installing 3/4 inch NPT
Series DS-1 Dry Type Sprinklers on a
dry pipe sprinkler system, only use the
side outlet of maximum 2 inch size
reducing tee’s.
For wet pipe sprinkler systems, the
Series DS-1 Dry Type Sprinklers may
also be installed in the 1 or 3/4 inch
NPT outlet of a Central Figure 730
Mechanical Tee.
NOTE
Do not install the Series DS-1 into any
other type fitting without first consult-
ing the Technical Services Depart-
ment. Contact the Technical Services
Department with regard to the applica-
bility of 1-1/4-14 UNC inlet thread con-
nections. Failure to use the appropri-
ate fitting may result in: failure of the
sprinkler to properly operate due to
formation of ice over the inlet Plug or
binding of the inlet Plug; or, insufficient
engagement of the inlet pipe threads
with consequent leakage.
Branch, cross, and feedmain piping
connected to Dry Sprinklers and sub-
ject to freezing temperatures must be
pitched for drainage in accordance
with the minimum requirements of the
National Fire Protection Association
for dry pipe sprinkler systems.
When Dry Sprinklers are to be used in
wet pipe sprinkler systems protecting
areas subject to freezing temperatures
(e.g., sprinkler drops into freezers),
consideration must be given to the ap-
propriate length of the sprinkler that
will prevent freezing of the water in the
connecting pipes due to conduction.
When the temperature surrounding
the wet pipe sprinkler system is main-
tained at a minimum temperature of
40°F/4°C, the following are the mini-
mum recommended lengths between
the face of the sprinkler fitting and the
outside surface of the protected area
(i.e., length exposed to minimum am-
bient of 40°F/4°C):
•
12 inches (300 mm) when the tem-
perature within the protected area
is -20°F/-29°C
•
18 inches (450 mm) when the tem-
perature within the protected area
is -40°F/-40°C
•
24 inches (600 mm) when the tem-
perature within the protected area
is -60°F/-51°C
For protected area temperatures be-
tween those given above, the minimum
recommended length from the face of
the fitting to the outside of the pro-
tected area may be determined by in-
terpolating between the indicated val-
ues.
NOTE
When Dry Sprinklers penetrate a ceil-
ing or wall into an area subject to freez-
ing, the clearance space around the
Sprinkler Casing must be completely
sealed in order to prevent the leakage
of moist air into the freezing area
which might result in the formation of
condensate around the Frame, Deflec-
tor, Bulb Seat, or Bulb. Failure to pre-
vent the formation of condensate could
result in the build-up of ice around the
releasing components. This could re-
sult in inadvertent operation of the
sprinkler or impaired operation due to
reduced thermal sensitivity.
Installation
The Series DS-1 Dry Type Sprinklers
must be installed in accordance with
the following instructions:
NOTES
The Series DS-1 must only be installed
in fittings that meet the requirements
of the Design Criteria section.
Refer to the Design Criteria section for
other important requirements regard-
ing piping design and sealing of the
clearance space around the Sprinkler
Casing.
Do not install any bulb type sprinkler if
the bulb is cracked or there is a loss of
liquid from the bulb. With the sprinkler
held horizontally, a small air bubble
should be present. The diameter of the
air bubble is approximately 1/16 inch
(1,6 mm) for the 135°F/57°C rating to
1/8 inch (3,2 mm) for the 360°F/182°C
rating.
A leak tight 1 inch NPT sprinkler joint
should be obtained with a torque of 20
to 30 ft.lbs. (26,8 to 40,2 Nm). Higher
levels of torque may distort the sprin-
kler inlet with consequent leakage or
impairment of the sprinkler.
Do not attempt to compensate for in-
sufficient adjustment in an Escutcheon
Plate by under- or over-tightening the
Sprinkler. Readjust the position of the
sprinkler fitting to suit.
Step 1.
Pendent sprinklers must be
installed only in the pendent position,
and upright sprinklers must be in-
stalled only in the upright position. The
deflector of a pendent or upright sprin-
kler is to be parallel to the ceiling.
Horizontal sidewall sprinklers are to be
installed in the horizontal position with
their centerline of waterway perpen-
dicular to the back wall and parallel to
the ceiling. The word “TOP” on the
Deflector is to face towards the ceiling.
Step 2.
With pipe thread sealant ap-
plied to the inlet threads, hand tighten
the sprinkler into the sprinkler fitting.
Step 3.
Wrench tighten the sprinkler
by wrenching on the Casing with a pipe
wrench whenever the casing is readily
accessible. Otherwise, use a W-Type 7
Sprinkler Wrench (Ref. Figure 2). The
wrench recess of the W-Type 7 is to be
applied to the sprinkler wrench flats
(Ref. Figure 2).
Step 4.
After the ceiling/wall has been
installed/finished, slide on the outer
piece of the Escutcheon until it comes
in contact with the ceiling/wall. Do not
lift the ceiling panel out of its normal
position.
In the case of the outer piece of the
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TFP500
OBSOLETE
