Reliable N252 EC User manual

Reliable Automatic Sprinkler Co., Inc., 103 Fairview Park Drive, Elmsford, New York 10523
ModelN252EC(SINRA0842)
K25.2 (360 metric) Pendent
and Recessed Pendent
Extended Coverage Density
Area Sprinkler
Bulletin 008 Rev. E
Bulletin 008 Rev. E
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 fin-
ished ceilings with 1/2” (13 mm) adjustment.
3. Available in brass, white polyester, black
polyester, and custom color polyester fin-
ishes.
4. Ordinary, 165 °F (74 °C), and Intermediate, 212
°F (100 °C) temperature ratings.
5. cULus Listed for unobstructed or noncom-
bustible 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 List-
ing 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 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 link reaches the rated tempera-
ture, the solder melts and the two link halves separate al-
lowing 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 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.”
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. Re-
liable Model FP escutcheons are the only recessed es-
cutcheons 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) sprin-
kler wrench. Usage of wrenches other than those speci-
fied 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.
• 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 sprin-
klers is 8 ft (2.4 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).

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. 02/15 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 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). Se-
lection of temperature rating is based on the
expected maximum ambient temperature expo-
sure, and in accordance with the applicable de-
sign 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 ei-
ther the ordinary or intermediate temperature rat-
ing 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 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 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 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)][Inter-
mediate, 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), sprin-
klers in Brass finish are supplied with non-decorative white
paint on the frame arms for identification of the temperature
rating.