Reliable N252 EC User manual

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
Bulletin 008 February 2019
Bulletin 008 February 2019
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 at 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.
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.

2.
Fig. 1
Model N252 EC Pendent
Fig. 2
Model N252 EC Recessed Pendent with Model FP Escutcheon

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
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 obstructed
construction, they may be installed within
trusses or bar joists having 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
Technical Data
Temperature
Classification
Temperature
Rating
Maximum
Ambient
Ceiling Temp. Link
Color
Nominal
K-Factor
gpm/psi½
(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)1/2 or 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
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 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. - lbs. (30 - 54 Nm) torque. Sprinklers not
tightened to recommended torque may cause leakage
or impairment of the sprinklers. Damaged sprinklers
must be replaced immediately.
Discharge Pattern Development.”
• Maximum area of coverage per sprinkler is
196 ft2(18.2 m2). Maximum spacing between
sprinklers is 14 ft (4.3 m) for coverage areas
over 144 ft2 (13.4m2) and 15 ft (4.6 m) for
coverage areas 144 ft2 (13.4m2) or less.
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 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 density 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 design flow rate and
pressure of 72.2 gpm (273.3 L/min) at 8.2 psi
(0.57 bar).

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. 02/19 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.
• 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. (0.92m). 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 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.