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Model A-1
Dry Pendent
Flush, Recessed, & Extended
Automatic Sprinkler
Manufactured by: Central Sprinkler Company
451 North Cannon Avenue, Lansdale, Pennsylvania 19446
Product
Description
The Model A-1 Dry Pendent Sprin-
klers are designed for use in special
applications such as freezing environ-
ments or in conditions where sedi-
ment or foreign material might accu-
mulate in ordinary drop nipples.
The Model A-1 is Listed by FM for
use as a standard sprinkler in accor-
dance with FM Loss Prevention Data
Sheets and current NFPA 13 Stan-
dards. The spacing, deflector dis-
tances and associated installation cri-
teria shall be in accordance with
these standards.
Operation: A fusible alloy is sealed
into a bronze center strut by a stain-
less steel ball. When the alloy melts
at its rated temperature, the ball is
forced down, releasing the strut and
allowing the seat of the sprinkler to
fall away. This action causes a guide
tube contained within the barrel of the
dry sidewall to reposition itself,
releasing ball bearings holding the cap
(plunger) in place at the other end of
the dry sidewall barrel. The cap
(plunger) is then discharged from the
barrel assembly, out the open sprin-
kler, followed by discharge of water.
A-1 Dry Pendent
Technical
Data
Model: A-1
Style: Flush, Recessed, or Extended
Wrench: Apply a pipe wrench to the upper
brass thread connector only.
Orifice Size:
1
⁄
" (12.7 mm)
2
Maximum Length: 36" (914.4 mm)
K-Factor: 5.6 (80.8 metric) Nominal
Maximum Working Pressure:
175 psi (12.1 bar)
Factory Hydro Test:
100% at 500 psi (34.5 bar)
Approvals
Temperature
Style
Rating
A-1
165°F/74°C
Flush &
212°F/100°C
Extended
286°F/141°C
A-1
165°F/74°C
Recessed
212°F/100°C
Pendent
*
The Central A-1 Flush & Extended Dry Pendent Sprinklers are Factory Mutual Approved for
use in Light Hazard and Ordinary Hazard Occupancies. Central A-1 Recessed Dry Pendent
Sprinklers are Factory Mutual Approved for use in Light Hazard only. The FM Approvals for
Ordinary Hazard Occupancies is limited to wet pipe sprinkler systems and preaction systems
qualifying as wet pipe systems.
1
1
"
⁄
(12.7 mm)
2
Orifice
Non-Adjustable
Dry Pendent
Automatic
Sprinkler
Standard
Approvals *
Finishes
Brass or
FM
Chrome Plated
Brass or
FM
Chrome Plated
7-99
Thread
Size
"NPT"
1"
(25 mm)
1"
(25 mm)
No.5-1.0
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Summary of Contents for CENTRAL A-1
- Page 1 212°F/100°C Pendent The Central A-1 Flush & Extended Dry Pendent Sprinklers are Factory Mutual Approved for use in Light Hazard and Ordinary Hazard Occupancies. Central A-1 Recessed Dry Pendent Sprinklers are Factory Mutual Approved for use in Light Hazard only. The FM Approvals for Ordinary Hazard Occupancies is limited to wet pipe sprinkler systems and preaction systems qualifying as wet pipe systems.
- Page 2 Figure 1 Model A-1 Figure 2 Model A-1 Non-Adjustable Dry Pendent Non-Adjustable Dry Pendent Flush, Recessed Extended 1" (25 mm) N.P.T. 1" (25 mm) N.P.T. Thread Thread “A” Dimension Main Tube (order length) Main Tube “A” Dimension 2" (50 mm)
- Page 3 Design Requirements—Standard Applications adjustment. The Model A-1 Flush, Recessed, and Extended Dry Pendent Sprinklers are Caution: Special care must be intended for standard area coverages and standard flow and pressure require- taken when installing with a CPVC ments as specified in current NFPA Standards.
- Page 4 Price List for further details of the Central Sprinkler distribution centers. Do not attempt to replace sprinklers warranty. You may write directly to Central without first removing the fire protec- Sprinkler Company, or call (215) tion system from service. Be certain...