Reliable N252 EC User manual

The Reliable Automatic Sprinkler Co., Inc., 103 Fairview Park Drive, Elmsford, New York 10523
Model N252 EC (SIN
RA0842) K25.2(360 metric)
Pendent and Recessed
Pendent Extended Coverage
Density Area Sprinkler
cULus Listed and FM
Approved for Storage and
Non-storage applications
Features
1. Provides maximum coverage areas up to 196 ft2
(18.21 m2) per sprinkler and 14 ft (4.27 m) by 14 ft
(4.27 m) spacing.
2. cULus Listed for recessed installation in finished
ceilings with 1/2" (13 mm) adjustment.
3. Available in brass, white polyester, black polyester,
and custom color polyester finishes.
4. Ordinary, 165 °F (74 °C), and Intermediate, 212 °F
(100 °C) temperature ratings.
5. cULus Listed for unobstructed or noncombustible
obstructed construction.
Listings and Approvals
1. Listed by Underwriters’ Laboratories Inc. and UL certified
for Canada (cULus).
2. FM Approved (Pendent only) as a K25.2 Extended
Coverage Quick-Response Pendent Storage and Non-
storage sprinkler.
3. Approved for use in New York City based on UL Listing per
Local Law 33/2007 and MEA 258-93-E
UL Listing Categories
Sprinklers, Automatic & Open
Sprinklers for Storage Protection (Standard Response Area/
Density)
UL Guide Number
VNIV
US Pat. No. 7.624.812
N252 EC Pendent
(cULus Listed and FM Approved)
N252 EC Recessed Pendent
(cULus Listed)
Product Description
The Models N252 EC Pendent and Recessed Pendent
Sprinklers are control mode, extended coverage sprinklers
for storage and non-storage density/area applications. This
includes 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.
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008FG02A
008FG01D
17/8"
(47 mM)
35/16"
(84 mM)
17/16"
(37 mM)
5/16" (7 mM)
Fig. 1
Model N252 EC Pendent
Fig. 2
Model N252 EC Recessed Pendent with Model FP Escutcheon
CEILING
1/2" (13 mM) max.
ADJUSTMENT
25/8" DIA (66.7 mM)
DIA.HOLE IN CEILING
25/16" DIA (58.7 mM) DIA CUP
115/16" (49 mM) MAX.
17/16" (37 mM) MIN.
FACE OF FITTING TO FACE
OF CEILING DIMENSION
11/8" (29 mM)
TO
15/8" (41 mM)
CEILING OR UNDERSIDE OF ROOF DECK

3
recessed pendent sprinklers must be installed with the Model N
(Fig. 3) sprinkler wrench. Usage of wrenches other than those
specified may damage these sprinklers. Sprinklers should be
tightened between 22 to 40 ft-lb (30-54 N-m) torque. Sprinklers
not tightened to recommended torque may cause leakage or
impairment of the sprinklers. Damaged sprinklers must be
replaced immediately.
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 applicable NFPA standards, when
used in combination with the following guidelines:
• Protection for extra hazard and high-piled storage
occupancies using NFPA 13 density/area criteria.
• Suitable for use in wet pipe systems, and in dry-pipe
and preaction systems as specifically allowed for
pendent sprinklers in NFPA 13.
• cULus Listed for “unobstructed” or non-combustible
“obstructed” construction. Given that the Model N252
EC sprinklers are specifically listed for noncombustible
Technical Data
Temperature
Classification
Temperature
Rating
Maximum
Ambient
Ceiling Temp. Link
Color
Nominal
K-Factor
gpm/psi1/2
(l/min.bar-0.5)
Thread
Size Thermal Sensitivity Sprinkler
Identification
Number (SIN)
°F °C °F °C
Ordinary 165 74 100 38 Black 25.2
(360) 1" NPT (ISO 7-1 R1)
Response Time Index
(RTI) of 50 (m.s)1/2or less
cULus Standard Response
FM Quick Response
RA0842
Intermediate 212 100 150 66 White
Fig. 4
Model N1 Wrench
Frame Arm
Link Assembly
Model N wrench
Fig. 3
Model N Wrench
Operation
The Reliable Model N252 Extended Coverage Pendent and
Recessed Pendent Sprinklers utilize a levered fusible alloy solder
link. When the link reaches the rated temperature, the solder
melts and the two link halves separate allowing sprinkler to
operate and water to flow.
Installation
Model N252 sprinklers are to be installed as shown. Reliable
Model FP escutcheons are the only recessed escutcheons
Listed for use with Model N252 EC sprinklers. Use of any
other recessed escutcheon will void all listings and warranties.
When handling sprinklers, hold sprinklers only on frame arms
and do not apply any force on the link assembly. Model N252
EC pendent sprinklers must be installed with the Model N
(Fig. 3) or Model N1 (Fig. 4) sprinkler wrench. Model N252 EC
obstructed construction, they may be installed within
trusses or bar joists having noncombustible web
members greater than 1" (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 sprinkler 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 sprinklers is 8 ft (2.4 m).
• Minimum flow requirement is based on the design
density applied over the actual area of coverage per
sprinkler. Example 1, a design density of 0.43 gpm/ft2
(17.5 mm/min) applied over 14 ftx14 ft (4.3 mx4.3 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 density of 0.43 gpm/ft2(17.5 mm/min) applied
over 14 ftx12 ft (4.3 mx3.7 m) spacing, or 168 ft2
(15.6 m2), would require a minimum sprinkler design
flow rate and pressure of 72.2 gpm (273.3 l/min) at
8.2 psi (0.57 bar).

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.
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.
EG. Printed in U.S.A. 02/15 P/N 9999970286
• Maximum working pressure – 175 psi (12.1 bar).
• Minimum end head pressure – 7 psi (0.5 bar).
• The minimum clearance between the deflector and
the top of storage is 3 ft (0.92 m). For clearances of
3 ft (0.92 m) up to 4 ft (1.21 m), the minimum design
pressure is 22 psi (1.52 bar). For clearances of 4 ft
(1.21 m) and greater, the minimum design pressure is
established by the minimum flow requirement (however,
the pressure 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 exposure, and in accordance
with the applicable design criteria from 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 Extended
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 sprinkler is FM Approved for
use in accordance with the following guidelines:
• FM Approved for installations governed by data sheets
2-0 and 8-9.
• The Model N252 EC Pendent is FM Approved as a
K25.2Extended Coverage Quick Response Pendent
Storage and Non-storage sprinkler.
Maintenance
The Models N252 EC Pendent and Recessed Pendent
Sprinklers should be inspected and the sprinkler system
maintained 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 gentle vacuuming. Replace 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, sprinklers should be maintained
in the original cartons and packaging until used to minimize the
potential for damage to sprinkler that would cause improper
operation or non-operation.
Ordering Information
Specify:
1. Sprinkler: Model N252 EC
2. Temperature Rating: [Ordinary, 165 °F (74 °C)][Intermediate,
212 °F (100 °C)]
3. Threads: [1" NPT][ISO 7-1R1]
4. Finish: [Brass*][White Polyester][Black Polyester][Custom
Color Polyester – Specify]
5. Recessed Escutcheon: [None][Model FP – cULus Listed
only]
6. Sprinkler Wrench: [None][Model N – Pendent and Recessed
Pendent][Model N1 – Pendent only]
*Note: Intermediate temperature rated, 212 °F (100 °C), sprinklers
in Brass finish are supplied with non-decorative white paint on the
frame arms for identification of the temperature rating.