Plans /— /20D5 se✓ %� v' c
CONCEALED PENDENT SPRINKLERS, RESIDENTIAL
MODEL F978 DESIGNER, BULB TYPE 4. K- FACTOR, 155 °F
GENERAL DESCRIPTION Dim. Inches MM
A - 3- 5/16 84,1
The 4.2 K- factor, Model F978 Design- B- 3/16 4,8
er Residential Concealed Pendent c - 2 -5/8 66,8 ��� i ■ I/2
Sprinklers (Ref. Figure A) are auto- D - Min. 1 -15/16 49,2 / REDUCER
matic sprinklers of the frangible bulb D - Nom. 2 -3/16 55,6 (TYPICAL
type. They are to be used in; D • Max. 2 -7/16 61,9 INSTALLATION)
• wet pipe residential sprinkler sys-
tems
for one- and two - family dwell- I /2 (12,7mm) 4 \ c (DIA) /
ings and mobile homes per NFPA ADJUSTMENT \ \\
13D, 1/2" NPT
• wet pipe residential sprinkler sys -
tems for residential occupancies up
to four stories in height per NFPA
13R, and
D
— SPRINKLER/
• wet pipe sprinkler systems for the MOUNTING CUP
residential portions of any occu- 1 ASSEMBLY ic ---- pancy per NFPA 13. 7 _ _
The small Cover Plate is flat, to blend l _ii
in with the ceiling for an aesthetically '
pleasing and relatively unnoticeable � C OVER PLATE ASSEMBLY
appearance. Standard finishes for the L B 3/32' GAP
Cover Plate are painted white and 4 A (DIA) lb. (2,4 mm)
satin chrome plated. Other factory ap-
plied painted finishes for the Cover FIGURE A
Plate are available on special order. 4.2 K- FACTOR MODEL F978 DESIGNER RESIDENTIAL
The separable two-piece design of the CONCEALED PENDENT SPRINKLERS -
Cover Plate and Mounting Cup As-
semblies allows installation of the
sprinklers and pressure testing of the moved and the Cover Plate Assembly '
fire protection system prior to installa- installed. APPROVALS AND STANDARDS
tion of a suspended ceiling or applica-
tion of the finish coating to a fixed The F978 Sprinklers have been de- The 4.2 K- factor, Model F978 Design -
ceiling. They also permit removal of signed to operate with a particular tern- er Residential Concealed Pendent .
suspended ceiling panels for access to perature rating and heat responsive Sprinklers are listed by Underwriters
building service equipment, without thermal characteristic, as well as to Laboratories Inc. and Underwriters'
having to first shut down the fire pro- discharge water in a specific pattern Laboratories of Canada. The listing
tection system and remove sprinklers. and quantity per square foot relation- only applies to the service conditions
ship. The combination of the perfor- indicated in the General Technical
' Also, the separable two -piece design mance characteristics which are asso- Data and Residential Design Criteria
of the the F978 Sprinkler provides for ciated with the F978 Sprinklers have sections.
1/2 inch (12,7 mm) of vertical adjust- been proven to help in the control of
ment, to reduce the accuracy to which residential type fires and, therefore, to Any questions concerning an interpre-
the length of fixed pipe drops to the improve the chance for occupants to tation of NFPA 13, 13D, or 13R sprink-
Sprinklers must be cut. escape or be evacuated. ler system design /installation stan-
dards, as well as requests for system
The F978 Sprinkler is shipped with a Fire sprinkler systems are not a substi- design /installation standards not ores-
Disposable Protective Cap as shown tute for intelligent fire safety aware- ently covered by NFPA 13, 13D, or
in Figure B. The Protective Cap is tern- ness or construction materials and 13R, should be addressed to the:
porarily removed to install the F978, practices required by building codes.
and then replaced to protect the F978 Secretary, Standards Council
j , while the ceiling is being installed and National Fire Protection Association
finished. The tip of the Cap can also be Batterymarch Park
used to mark the center of the ceiling Quincy, MA 02269
' hole into plaster board, ceiling tiles,
etc. by pushing the ceiling product WARNINGS
against the Cap. When the ceiling in- The Model F978 Designer Resi-
stallation is complete, the Cap is re- dential Concealed Pendent
Printed in U.S.A. 1 -96 TD584M
DISCHARGE IN U S GALLONS PER MINUTE (GPM) .
50 5 10 15 20 25
1 1
` __ - !1 y 45 .0"---
CURVE ONLY - 30 f_,
I; , 1 a —MAX PRESSURE 175 PSI
I1 :: SPRINKLER/ MOUNTING 5 40
I. II CUP ASSEMBLY = t
1.� 1- 5 35 ` 2 5 ¢
� 0 h Q
O m de
¢ 30 n 1 =
1, a t b� 20 ¢
• P • m
' I , ■ DISPOSABLE n � e' P ±1.5
o PROTECTIVE z
20 ci' ■
-- - - CAP W 2
N
W I •
PAR TIAL CRVE ONLY -
- -- , MA PRESS U 12.07 B 0.5
\
`� 71P 5 50 75 100
DISCHARGE IN LITERS PER MINUTE
FIGURE B FIGURE C
DISPOSABLE PROTECTIVE CAP FOR F978 SPRINKLER NOMINAL DISCHARGE CURVE
Sprinklers described herein must phosphor bronze per CDA Alloy 510,
be installed and maintained in GENERAL TECHNICAL DATA and theYoke is high strength brass.
compliance with this document,
as well as with the applicable The 4.2 K- factor, Model F978 Design- The Frame is secured to the Mounting
standards of the National Fire er Residential Concealed Pendent Cup and Mounting Plate with a plated
Protection Association, in addi- Sprinklers are available in a steel Retaining Ring. The Mounting
tion to the standards of any other 155'F/68'C temperature rating, and Cup, which is chrome plated 0.021
authorities having jurisdiction. they are rated for use at a maximum inch (0.53 mm) thick, low carbon sheet
Failure to do so may impair the service pressure of 175 psi (12,1 bar). steel, is staked to a stainless steel
integrity of these devices. The nominal installation dimensions Mounting Plate, and the Mounting
are given in Figure A. Standard fin- Plate provides for rigid engagement of —
Because of the above cited ishes for the Cover Plate are painted the Sprinkler Wrench (Ref. Figure J)
stipulations and the varied na- white and satin chrome; however, with the Frame. •
ture of residential type architec- other painted finishes for the Cover
ture, there will be some compart- Plate are available on special order. A polyethelene Disposable Protective
ment designs which cannot be Cap (Ref. Figure B) is provided as part
fully sprinklered in accordance The nominal discharge curve for the of the Sprinkler /Mounting Cup Assem-
with the recommendations of F978 is plotted in Figure C and it rep- bly.
NFPA 13, 13D, or 13R. In the event resents the flow "Q" in GPM (LPM) as
of this condition, consult the au- determined by the formula: The Cover Plate Assembly, which
thorities having jurisdiction for Q= K\ screws onto the Sprinkler /Mounting
guidance and approval. P Cup Assembly, consists of a Cover
where the nominal discharge coeffi- Plate which is soldered to an Enclo-
It is the responsibility of an in- cient "K" = 4.2 (60,5); and "p" equals sure at three equidistant locations
stalling contractor to provide a the residual flowing pressure in psi around its periphery. Solder having a
copy of this document to the owner (bar). temperature rating of 135'F/57'C is
or his representative and, in turn, used with Cover Plate Assembly. The
it is the obligation of the owner to The F978 Sprinkler consists of two as- Cover Plate and Enclosure are brass
provide a copy of this document to semblies, as shown in Figure D: the per ASTM B36 (C26000 or C26800). A
a succeeding owner. Sprinkler /Mounting Cup Assembly and Type 302 stainless steel compression
the Cover Plate Assembly. Spring is located between the flange of
The owner is responsible for the Enclosure and the Cover Plate, to
maintaining their fire protection The Sprinkler /Mounting Cup Assembly ensure separation of the two pieces
system and devices in proper op- utilizes a 155'F/68'C, 3mm Bulb and when the solder melts.
erating condition. The installing has a bronze Frame per ASTM B176
contractor or sprinkler manufac- (C87800) and a brass Orifice Insert per When the Cover Plate Assembly is ex-
turer should be contacted relative ASTM B140 (C32000). The Button posed to a temperature sufficient to
to any questions. (bulb retainer) is phosphor bronze per fuse the solder, the Cover Plate will fall
ASTM B103 (C51000, C52000, or away from the Enclosure which allows
C54400), the Ejection Spring is stain- the Deflector to drop and to expose the
less steel, and the Compression Sprinkler for operation.
Screw is a plated bronze per ASTM
B140 (C31400). The Gasketed Spring NOTES
Plate consists of an Inconel (per ASTM Absence of the Cover Plate Assem-
B168) disc spring that is sealed on bly may delay the time to sprink-
both its inside and outside edges with ler operation in a fire situation.
a Teflont gasket. The Deflector is
brass per ASTM B36 (C22000), and The F978 Mounting Cup and
the Deflector Cone is brass per ASTM Cover Plate Assembly shown in
B16 (C36000). The Deflector Arms are Figure D cannot be used to hold
—2— t DuPont Registered Trademark