Reliable RFS42 User guide

Reliable Automatic Sprinkler Co., Inc., 103 Fairview Park Drive, Elmsford, New York 10523
Model RFS42
Residential Flat Concealed
Horizontal Sidewall Sprinkler
(SIN RA4835)
Bulletin 048 May 2022
Bulletin 048 May 2022
Coverage to 16 ft. x 20 ft. (4.9m x 6.1m)
Features:
1. Flat cover plate for a flush, concealed wall nish.
2. 4.2 (60 metric) K Factor.
3. Sized to t in a 3½” or larger stud space even
when installed directly in a TorqueSafeTM 90°
Sprinkler Head Elbow** and several other com-
mon ½” and ¾” by ½” sprinkler ttings.
4. Push-on/pull-off flat cover plate.
5. Sprinkler shipped complete with factory installed
protective cap.
6. Sprinkler assembly and cover plate packaged sepa-
rately.
7. 1
/
8” (3.2 mm) cover plate adjustment.
8. Model RFS Cover plate available in a wide variety
of colors and nishes.
Listings & Approvals
1. Listed by Underwriters Laboratories Inc. and UL
certified for Canada (cULus).
UL Listing Category
Residential Automatic Sprinklers
UL Guide Number
VKKW
Patents:
U.S. Patent No. 7,353,882, other Patents pending
Product Description
The Reliable Model RFS42 Concealed Residential Extended
Coverage Horizontal Sidewall Sprinkler is an attractive, con-
cealed sprinkler assembly specially sized to t within a 3½”
or larger stud space. The sprinkler uses a push-on/pull-off flat
cover plate assembly. The sprinkler assembly is shipped with a
protective cap.
The flat cover plate is attached to the skirt using 135°F (57°C)
ordinary temperature classication solder. The sprinkler is in-
stalled into the sprinkler tting using the Model G6 Sprinkler
Wrench.
When the ambient temperature rises, the solder holding the
cover plate melts, allowing the release of this part and thus ex-
posing the sprinkler inside to the rising ambient temperature.
This sprinkler is listed for a maximum service pressure of 175
psi (12,0 bar).
Application and Installation
The Model RFS42 sprinkler is intended for installation in the
residential portions of any occupancy in accordance with NFPA
13, 13R & 13D. The sprinkler is listed as a Concealed Residen-
tial Horizontal Sidewall Sprinkler. System design and installation
requirements for ceiling congurations are described in NFPA
13, 13R or 13D, as applicable.
The minimum listed spacing between Model RFS42 sprin-
klers is 8 ft (2.4 m).
The low flow RFS42RES sprinklers are specically engineered
to meet the latest residential sprinkler listing standards (UL
1626 Standard).*
The sprinkler must be installed and properly oriented with the
Model G6 Wrench:
Do not remove the factory installed plastic protective cap
since it is sized to t inside the G6 wrench. Note that the sprin-
kler can only mate when the sprinkler’s deflector orientation
tab (Fig. 1) is aligned with wrench’s key-way. The G6 wrench
is provided with bubble level pad and TOP marking, to allow
the proper orientation of the horizontal sidewall deflector. Final
leveling can be done after leak proof joint is obtained with a
minimum to maximum torque of 8 to 18 ft-lbs (11 to 24 N.m).
Leave the protective cap on to protect the sprinkler while the
wall is plastered, wallpapered or painted. The protective cap
must be removed and the listed cover plate installed prior to
the sprinkler system being placed in service. A 25/8” (67 mm)
diameter hole must be cut in the wall for the sprinkler assembly
to extend through.
Concealed cover plate/cup assemblies are listed only for use
with specic sprinklers. The use of any other concealed cover
plate/cup assembly with the Model RFS42 Horizontal Sidewall
Sprinkler or the use of this dedicated concealed cover plate as-
sembly on any sprinkler with which it is not specically listed will
void all guarantees, warranties, listings and approvals.
* Effective date 3/14/2008
**Spears Manufacturing Company

2.
Technical Data:
Orice
Size
“K” Factor
Thread
Size
Maximum
Ambient
Temperature
Sensitivity Maximum Water
Working Pressure
Sprinkler
Identication
Number
(SIN)
Approvals
US Metric
3/8” (9.6mm) 4.2 60 ½” NPT (R½) 100°F (38°C) Fast-Response 175 PSI (12 bar) RA4835 cULus
Listed Design Criteria***
Max. Coverage Area
Width x Length
Deflector to Ceiling
Dimension Flow Rate Pressure Temperature Rating
ft. x ft. m x m inches mm gpm L/min psi bar Sprinkler Cover
12 x 12 3.6 x 3.6 4 - 6 102 - 152 12 45.4 8.2 0.57
165°F (74°C) 135°F (57°C)
12 x 12 3.6 x 3.6 6 - 12 152 - 305 13 49.2 9.6 0.67
14 x 14 4.3 x 4.3 4 - 6 102 - 152 12 45.4 8.2 0.57
14 x 14 4.3 x 4.3 6 - 12 152 -305 14 53.0 11.1 0.78
16 x 16 4.9 x 4.9 4 - 12 102 - 305 16 60.6 14.5 1.01
16 x 18 4.9 x 5.5 4 - 12 102 - 305 18 68.1 18.4 1.29
16 x 20 4.9 x 6.1 4 - 6 102 - 152 22 83.3 27.4 1.92
16 x 20 4.9 x 6.1 6 - 12 152 - 305 23 87.0 30.0 2.10
***For NFPA 13 systems calculate for a minimum design density of 0.1 gpm/sf, but in no case go below the Listed Design
Criteria Flow Rate and Pressure.
Material Data
Bronze Sprinkler Body, Spring Closure Cap, Yoke, Lever, Slide Pin, Slide Plate, Deflector, Set Screw
Brass Cover Plate, Sprinkler Sleeve, Frame Arms
Stainless Steel Push Spring, Ball, Load Screw, Rivet
Copper Plated Steel Cover Plate Skirt
Nickel Alloy Fusible Element
Nickel Alloy coated with
PTFE Adhesive Tape Sealing Washer
Installation Guide for 3½” or Larger Stud Space
Fig. 1
Fig. 2
Front View
Fig. 3:
1. Securely support pipe from adjacent stud.
2. Pipe support clamp shall be located within 1” [25 mm] of sprinkler tting’s inlet lip.
3. The center of the sprinkler tting shall be located at a horizontal distance of 13 /
8” [35 mm] or more from the stud (Fig. 3).
4. The sprinkler tting shall be installed so that the rear of the sprinkler is 21 /
16” +/- 1
/
16” from the nished surface of the wall.
Verify wall assembly dimensions prior to installation to ensure that the cover plate attaches to the sprinkler and seats
against the nished wall surface (Fig. 1).
3.
RFS42 Residential Flat Cover Concealed Horizontal Sidewall Sprinkler SIN RA4835
Attachment Method:
Fig. 3

Maintenance
Model RFS42 Concealed Sprinklers should be inspected
and maintained in accordance with NFPA 25. Do not clean
sprinklers with soap and water, ammonia or any other cleaning
fluids. Remove dust by using a soft brush or gentle vacuum-
ing. Replace any sprinkler or cover plate assembly, which has
been painted (other than factory applied) or damaged in any
way. 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 their original
cartons and packaging until used to minimize the potential for
damage to sprinklers that would cause improper operation or
non-operation. Once operated automatic sprinklers and cover
plates cannot be reassembled and reused. New sprinklers of
the same size, type and temperature rating must be installed.
A cabinet of replacement sprinklers should be provided for this
purpose.
Model RFS42 Residential Flat Cover Concealed
Horizontal Sidewall Sprinkler Specication
Sprinklers shall be a UL listed as residential flat cover
concealed horizontal sprinkler with RFS42 deflector and
adjustable cover plate for light hazard, interior, non-corrosive
applications. Sprinklers to be of bronze frame construction
with brass cover plate and copper alloy retainer flange
assembly. Water seal assembly shall consist of a PTFE coated
Belleville spring washer and machined brass cup containing
no plastic parts. Method of attaching the cover plate to
the sprinkler cup shall be a Push-on and Pull-off design
allowing a 1 /
8” cover plate adjustment. Sprinklers shall have
a nominal K-factor of 4.2 (60 metric), and ½” NPT thread.
Sprinkler temperature rating shall be 165°F (74°C) with a
cover plate temperature rating of 135°F (57°C). Sprinklers
shall be capable of a maximum coverage area of 16 ft. x
20 ft. (4.9 m x 6.1 m), with a minimum lateral spacing of 8
ft. (2.4 m). Rated working pressure shall be 175 psi (12,0
bar). A plastic protective cap shall be provided and factory
installed onto the sprinkler cup to protect the sprinkler from
damage, which could occur during construction before the
cover plate is installed. Cover plate nish: [White] [Custom
Color–specify]. Residential Coverage Concealed horizontal
sidewall sprinklers shall be Reliable Model RFS42. SIN
RA4835 (Bulletin 048).
Cover Plate Finishes(1)
Standard Finish
White
Chrome
Special Application Finishes
Off White Paint
Black Paint
Custom Color Paint
Bright Brass
Finished Bronze
Raw Brass (Lacquered)
Satin Chrome
Custom Printed
(1) Other colors and nishes are available. Consult factory for details.
Note: Paint or any other coatings applied over the factory
nish will void all approvals and warranties.
Ordering Information
Specify:
1. Model RFS42 Residential Sidewall
2. Model RFS Cover Plate Finish
Installation Wrench
Model G6 Sprinkler Wrench
Installation Aid
A protective plastic cap is included for use during installa-
tion.
Reliable Automatic Sprinkler Co., Inc.
[phone] Sales Ofces
[phone] Sales Fax
[phone] Corporate Ofces
www.reliablesprinkler.com Internet Address
Manufactured by
Recycled
Paper
Revision lines indicate updated or new data.
EG. Printed in U.S.A. 05/22 P/N 9999970457
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 qualied
and reputable sprinkler contractors located throughout the United States, Canada and foreign countries.