Reliable N252 EC User manual

The Reliable Automatic Sprinkler Co., Inc., 103 Fairview Park Drive, Elmsford, New York 10523
Model N252 EC Pendent and
Recessed Pendent Extended
Coverage Area Density
Sprinklers for Storage and
Extra Hazard Applications
Bulletin 008 Rev. D
Bulletin 008 Rev. D
Model N252 (SIN RA0842)
Nominal K-Factor = 25.2
Features
1. Provides maximum coverage areas up to 14 ft.
(4,27 m) by 14 ft. (4,27 m) 196 ft2(18,21 m2).
2. Can be installed recessed below finished
ceilings with 1/2” (13 mm) adjustment.
Available in brass, chrome, black plated
and white polyester coated finishes.
3. 165 °F (74 °C) and 212 °F (100 °C) temperature
ratings.
4. Listed by Underwriters’ Laboratories
Inc, Underwriters’ Laboratories for
use in Canada and Factory Mutual.
5. cULus Listed for unobstructed or non-
combustible obstructed construction.
Listings and Approvals
Listed by Underwriters’ Laboratories Inc.,
UL certified for Canada (cULus) and
FM Approved (Pendent only) as a storage sprinkler.
NYC MEA 258-93-E
UL Listing Categories
Sprinklers, Automatic & Open
Sprinklers for Storage Protection (Area/Density)
UL Guide Number
VNIV
US Pat. No. 7,624,812
N252 EC Pendent
N252 EC Recessed Pendent
(UL approved only)
Product Description
The Models N252 EC Pendent and Recessed Pendent
Sprinklers are control mode, extended coverage sprinklers for
storage and extra hazard density/area applications. This in-
cludes protection of the storage and display of Class I through
Class IV commodities, non-expanded Group A Plastics, and
non-expanded, exposed Group A Plastics in retail stores. The
Model N252 EC sprinklers offer maximum coverage areas up
to 14 ft by 14 ft (196 ft2), which is almost twice of that provided
by standard coverage sprinklers. This offers the advantage of
decreasing the number of required sprinklers, reducing labor
and material costs.
Operation
The Reliable Model N252 Extended Coverage Pendent
and Recessed Pendent Sprinklers utilize a levered fusible
alloy solder link. When the rated temperature is reached,
the solder melts and the two link halves separate allowing
sprinkler to operate and water to flow.

2.
Fig. 1
Model N252 EC Pendent
Fig. 2
Model N252 Recessed EC Pendent/ FP
Installation
Model N252 sprinklers are to be installed as shown.
Model FP escutcheons, illustrated herewith, are the only
recessed escutcheons to be used with Model N252 EC
Recessed Pendent Sprinklers. Use of any other recessed
escutcheon will void all approvals and warranties. When
handling sprinklers, hold sprinklers only on frame arms
and do not apply any force on the link assembly. For in-
stalling Model N252 EC pendent and recessed pendent
sprinklers use only the Model N wrench (ref. Fig. 3). Use
of wrenches other than that specified may damage these
sprinklers. Sprinklers should be tightened between 22 to
30 ft. - lbs. (29,8 - 40,7 Nm) torque. Sprinklers not tight-
ened to recommended torque may cause leakage or im-
pairment of the sprinklers. Damaged sprinklers must be
replaced immediately.
Fig. 3
Model N Wrench
Frame Arm
e
Link Assembly
Model N wrench

3.
Design Criteria for UL and C-UL
The Models N252 EC Pendent and Recessed Pendent
Sprinklers are cULus Listed standard response control-
mode, extended coverage density/area sprinklers for
installation in accordance with the extended coverage
pendent spray sprinkler criteria of NFPA 13, or other ap-
plicable NFPA standards, when used in combination with
the following guidelines:
• Protection for extra hazard and high-piled stor-
age occupancies using NFPA 13 density/area
criteria.
• Suitable for use in wet pipe systems, and in dry-
pipe and preaction systems as specifically al-
lowed for pendent sprinklers in NFPA 13.
• cULus Listed for “unobstructed” or non-combus-
tible “obstructed” construction. Given that the
Model N252 EC sprinklers are specifically listed
for noncombustible obstructed construction, they
may be installed within trusses or bar joists hav-
ing noncombustible web members greater than
1 inch (25.4 mm) when applying the “Four Times
Rule” as defined in NFPA 13 under “Obstructions
to Sprinkler Discharge Pattern Development.”
• Maximum area of coverage per sprinklers is 196
ft2(18.2 m2); minimum area of coverage is 100 ft2
(9.3 m2). Maximum spacing between sprinklers
is 14 ft (4.3 m); minimum spacing between sprin-
klers is 10 ft (3.1 m).
• Minimum flow requirement is based on the de-
sign density applied over the actual area of cov-
erage per sprinkler. Example 1, a design density
of 0.43 gpm/ft2(17.5 mm/min) applied over 14 ft
x 14 ft (4.3 m x 4.3 m) spacing, or 196 ft2(18.2
m2), would require a minimum sprinkler design
flow rate and pressure of 84.3 gpm (319.2 L/min)
at 11.2 psi (0.77 bar). Example 2, a design den-
sity of 0.43 gpm/ft2(17.5 mm/min) applied over
14 ft x 12 ft (4.3 m x 3.7 m) spacing, or 168 ft2
(15.6 m2), would require a minimum sprinkler de-
sign flow rate and pressure of 72.2 gpm (273.3
L/min) at 8.2 psi (0.57 bar).
• Maximum working pressure - 175 psi (12.1 bar).
• Minimum end head pressure - 7 psi (0.5 bar).
Technical Data
Sprinkler
Model Type
Temperature
Rating
Maximum
Ambient
Ceiling Temp.
Nominal K-
Factor
GPM/psi
(LPM/bar)½
Orifice
Size
Thread
Size
Sprinkler Ht.
Inch (mm)
Sprinkler
Identification
Number (SIN)
°F °C °F °C
N252 EC
Pendent/
Recessed
Pendent
165 74 100 38 25.2
(363) 1 inch 1” NPT (R1)
3.6
(91,5) RA0842
212 100 150 66
• The minimum clearance between the deflec-
tor and the top of storage is 3 ft. (0,92m). For
clearances of 3 ft. (0,92m) up to 4 ft. (1,21m), the
minimum design pressure is 22 psi (1,52 bar).
For clearances of 4 ft. (1,21m) and greater, the
minimum design pressure is established by the
minimum flow requirement (however, the pres-
sure can never be less than 7 psi (0,48 bar)).
• Available temperature ratings are Ordinary, 165
°F (74 °C) and Intermediate, 212 °F (100 °C).
Selection of temperature rating is based on the
expected maximum ambient temperature expo-
sure, or in accordance with the high-piled stor-
age density/area curve requirements specified
in Chapter 12 of the 2002 edition of NFPA 13. In
accordance with the listing of the sprinkler, the
density curves normally associated with high
temperature rated sprinklers [286°F (141°C)] may
be used with either the ordinary or intermediate
temperature rating of the N252 EC sprinklers.
• The obstruction criteria in NFPA 13 for Extend-
ed Coverage Pendent Sprinklers shall be used
for the locating and positioning Model N252 EC
sprinklers relative to obstructions.
Design Criteria for FM
The Model N252 EC Pendent Sprinklers are FM approved to
be utilized in accordance with the following guidelines:
• FM approved for installations governed by data
sheets 2-0 and 8-9.
• FM Global considers this a “Quick Response”
extended coverage storage sprinkler.
Maintenance
The Models N252 EC Pendent and Recessed Pendent
Sprinklers should be inspected and the sprinkler system main-
tained in accordance with NFPA 25, and local jurisdictional
requirements. Do not clean sprinklers with soap and water,
ammonia, or any other cleaning fluids or solvents. Remove
dust by using a soft brush or gentle vacuuming. Remove any
sprinkler that has been painted (other than factory-applied) or
otherwise altered after leaving the factory. A stock of spare
sprinklers should be maintained to allow quick replacement
of damaged or operated sprinklers. Prior to installation, sprin-
klers should be maintained in the original cartons and packag-
ing until used to minimize the potential for damage to sprinkler
that would cause improper operation or non-operation.

The Reliable Automatic Sprinkler Co., Inc.
[phone] Sales Offices
[phone] Sales Fax
[phone] Corporate Offices
www.reliablesprinkler.com Internet Address
Manufactured by
Recycled
Paper
Revision lines indicate updated or new data.
EG. Printed in U.S.A. 12/13 P/N 9999970286
The equipment presented in this bulletin is to be installed in accordance with the latest published Standards of the National Fire Protection Association, Factory
Mutual Research Corporation, or other similar organizations and also with the provisions of governmental codes or ordinances whenever applicable.
Products manufactured and distributed by Reliable have been protecting life and property for over 90 years, and are installed and serviced by the most highly
qualified and reputable sprinkler contractors located throughout the United States, Canada and foreign countries.
• Automatic sprinklers
• Flush automatic sprinklers
• Recessed automatic sprinklers
• Concealed automatic sprinklers
• Adjustable automatic sprinklers
• Dry automatic sprinklers
• Intermediate level sprinklers
• Open sprinklers
• Spray nozzles
• Alarm valves
• Retarding chambers
• Dry pipe valves
• Accelerators for dry pipe valves
• Mechanical sprinkler alarms
• Electrical sprinkler alarm switches
• Water flow detectors
• Deluge valves
• Detector check valves
• Check valves
• Electrical system
• Sprinkler emergency cabinets
• Sprinkler wrenches
• Sprinkler escutcheons and guards
• Inspectors test connections
• Sight drains
• Ball drips and drum drips
• Control valve seals
• Air maintenance devices
• Air compressors
• Pressure gauges
• Identification signs
• Fire department connection
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