TFP540
Page 6 of 8
For wet pipe system installations of 1
in. NPT Series DS-2 Dry-Type Sprin-
klers connected to CPVC piping, use
only the following TYCO CPVC fittings:
• 1 in. x 1 in. NPT Female Adapter (P/N
80145)
• 1 in. x 1 in. x 1 in. NPT Sprinkler Head
Adapter Tee (P/N 80249)
For dry pipe system installations,
use only the side outlet of maximum
2 1/2 in. reducing tee when locat-
ing Series DS-2 Dry-Type Sprinklers
directly below the branch line. Oth-
erwise, use the configuration shown
in Figure 9 to assure complete water
drainage from above Series DS-2 Dry-
Type Sprinklers and the branchline.
Failure to do so may result in pipe
freezing and water damage.
NOTICE
Do not install Series DS-2 Dry-Type
Sprinklers into any other type fitting.
Failure to use the appropriate fitting
may result in one of the following:
• failure of the sprinkler to operate
properly due to formation of ice over
the Inlet Plug or binding of the Inlet
Plug
• insufficient engagement of the
Inlet pipe-threads with consequent
leakage
Drainage
In accordance with the minimum
requirements of the NATIONAL FIRE
PROTECTION ASSOCIATION for dry
pipe sprinkler systems, branch, cross,
and feed-main piping connected to Dry
Sprinklers and subject to freezing tem-
peratures must be pitched for proper
drainage.
Exposure Length
When using dry sprinklers in wet pipe
sprinkler systems to protect areas
subject to freezing temperatures, use
Table C to determine a sprinkler’s
appropriate exposed barrel length to
prevent water from freezing in the con-
necting pipes due to conduction. The
exposed barrel length measurement
must be taken from the face of the
sprinkler fitting to the surface of the
structure or insulation that is exposed
to the heated area. See Figure 9 for an
example.
For protected area temperatures
between those given above, the
minimum recommended length from
the face of the fitting to the outside of
the protected area may be determined
by interpolating between the indicated
values.
You can also install Series DS-2 Dry-
Type Sprinklers in the 1 in. NPT outlet
of a GRINNELL Figure 730 Mechanical
Tee. However, the use of the Figure 730
Tee for this arrangement is limited to
wet pipe systems.
The configuration shown in Figure 8 is
only applicable for wet pipe systems
where the sprinkler fitting and water-
filled pipe above the sprinkler fitting are
not subject to freezing and where the
length of the Dry-Type Sprinkler has the
minimum exposure length depicted in
Figure 9. See the Exposure Length
section.
Sprinkler Fittings
Install 1 in. NPT Series DS-2 Dry-Type
Sprinklers in the 1 in. NPT outlet or run
of the following fittings:
• malleable or ductile iron threaded
tee fittings that meet the dimensional
requirements of ANSI B16.3 (Class
150)
• cast iron threaded tee fittings that
meet the dimensional requirements
of ANSI B16.4 (Class 125)
Do not install Series DS-2 Dry-Type
Sprinklers into elbow fittings. The Inlet
of the sprinkler can contact the interior
of the elbow.
The unused outlet of the threaded tee is
plugged as shown in Figure 10.
SIDE
OUTLET
PLUGGED
TO WET
SYSTEM
FITTING
(SEE DESIGN
CRITERIA
SECTION)
SPRINKLER
DSB-2
BOOT
HEATED
AREA
AREA
SUBJECT
TO
FREEZING
RUN
OUTLET
PLUGGED
TO DRY
SYSTEM
DSB-2
BOOT
FITTING
(SEE DESIGN
CRITERIA
SECTION)
SPRINKLER
HEATED
AREA
(SEE DESIGN
CRITERIA
SECTION)
FACE OF
SPRINKLER
FITTING
LENGTH
EXPOSURE
DSB-2
BOOT
INSULATED
FREEZER
STRUCTURE
(ENDS ON
OPPOSING
SIDES OF
STRAP TIES
BOOT)
ADHESIVE
SHOWN
WITH FLUSH
ESCUTCHEON
DS-2
2-3/4" DIA.
(69,9 mm)
CLEARANCE
HOLE
DSB-2 BOOT
FIGURE 8
SPRINKLER FITTING
HEATED AREA
FIGURE 10
SPRINKLER FITTING
UNHEATED AREA
FIGURE 9
EXPOSURE LENGTH
FIGURE 11
MODEL DSB-2 DRY SPRINKLER
BOOT WITH SERIES DS-2
DRY-TYPE PENDENT SPRINKLER
