CENTRAL GBR User manual

latest in glass bulb technology, which results
in a much smaller more attractive sprinkler.
The operating mechanism consists of a liq-
uid-filled 3 mm diameter frangible capsule
that is only 20 mm in length.
The Model GBR Automatic Sprinklers are
intended for installation in accordance with
current NFPA 13, NFPA 13D and NFPA 13R
Standards and Central's Residential Installa-
tion Guide. They are available in 7/16"
(11.1 mm) and 1/2" (15 mm) orifice size, and
a 155°F/68°C temperature rating. The
Model GBR Sprinklers, escutcheons, and
concealed plates are available in brass or
chrome plated and white painted, with addi-
tional special painted finishes available.
Operation: The glass bulb capsule oper-
ating mechanism contains a heat-sensitive
liquid that expands upon application of heat.
Upon reaching the rated temperature, the
frangible capsule ruptures thereby releasing
the orifice seal. The sprinkler then dis-
charges water in a pre-designed spray pat-
tern to control or extinguish the fire.
7⁄16" (11.1 mm)
Orifice
Automatic
Sprinklers
Product
Description
The GBR Concealed, Recessed and
Pendent sprinklers have the ability to
cover large areas with very low flow and
pressure requirements. This, combined
with the aesthetics of the concealed and
recessed glass bulb design, provides a
sprinkler that is attractive and cost effec-
tive. The Model GBR-2 is U.L. Listed
for use in sloped ceilings with pitches
up to 8:12. Refer to the Sprinkler De-
sign Requirements Table on Page 3
for specific flows and pressures for
sloped ceilings, and Page 2 of this
Data Sheet for further sloped ceiling
design guidelines. The Central Model
GBR Automatic Sprinklers incorporate the
Manufactured by: Central Sprinkler Company
451 North Cannon Avenue, Lansdale, Pennsylvania 19446
1-98
No. 4-3.0
ResidentialApplications
The Model GBR Automatic Sprinklers are intended for Residential Applications in
accordance with NFPA 13, NFPA 13D, and NFPA 13R.
Model Thread Def-
&Deflector K-Factor Temp. Approved Size lector
Style (Orifice) Rating Escutcheon Finishes† Approvals (NPT) Length Width
GBR 4.3(7⁄16") 155°F/ ModelGBR Brass*UL 1⁄2"2"1
3⁄16"
Concealed + 66.3 68°C (135°F(57°C) ChromePlated*ULC 15mm 50.8mm 30.2mm
(11.1mm)
coverplate) WhitePainted*
GBR 4.3(7⁄16") 155°F/ Model Brass UL 1⁄2" 2
1⁄16" 1 3⁄16"
Pendent& + 66.3 68°C GBRes./QR ChromePlated ULC 15mm 52.4mm 30.2mm
Recessed (11.1mm) Recessed White
Pendent
GBR-2√4.3(7⁄16") 155°F/ Model Brass UL 1⁄2" 2
1⁄16" 1 3⁄16"
Pendent& + 66.3 68°C GBRes./QR ChromePlated ULC 15mm 52.4mm 30.2mm
Recessed (11.1mm) Recessed White
Pendent
GBR lConcealed
lRecessedPendent
lPendent
Technical
Data
Residential
FastResponse
GlassBulbAutomaticSprinklers
GBR & GBR-2
†
Offwhiteandothercustomfinishesavailableuponrequest.
* Coverplateonly,customfinishesavailableuponrequest.
• Highestallowableambienttemperatureforstorage:100 ° F/38 ° C for155 ° F/68 ° Csprinklers.
• Highestallowableambienttemperatureforstorageofcoverplates:100 ° F/38 ° C.
• Maximumworkingpressure: 175 p.s.i.(12.1bar)
• FactoryHydroTest: 100%@ 500p.s.i.(34.5 bar)
+ MetricK-Factor
√ Listedforslopedceilings
OBSOLETE

2
Pendents Located Along Multiple Slopes
• Spacing is measured along the slope.
• Maximum number of sprinklers located in a
compartment is umlimited.
• For multiple slopes within a compartment,
calculate the most demanding two sprinklers
along one slope only.
• See notes below if loft condition exists.
• a: minimum: 4"
maximum: one-half the maximum calculated
spacing
• b: minimum: 8'-0"
maximum: 20'-0"
GBR-2 Sloped Ceiling Design Guidelines
a
a
bb
D = MAXIMUM SLOPE
8:12 (33.7O)
D
a
a
NOTES: • The above design guidelines are based on actual testing performed at U.L. for slopes up to and including 8:12
pitch (33.7o). For slopes greater than 8:12 pitch, refer to Central Sprinkler Company's "Residential Installation
Guide" for proper placement and spacing criteria.
• One row of sprinklers shown on the sloping ceiling for clarity. Actual number of sprinklers within a compartment
is unlimited.
• If a loft adjoins the sloped ceiling compartment, a minimum 8" deep lintel is required.
• For ceilings with lofts, calculate the two most demanding sloped ceiling sprinklers plus one sprinkler at the loft
ceiling for a total of 3 sprinklers.
OBSOLETE

3
2 7/8" (73.0 mm)
Support Cup
1"
(25.4 mm)
Min.
1 3/8"
(34.9 mm)
Max.
Face of
Reducing
Coupling
3/4" (19.1 mm) Max.
3/8" (9.5 mm) Min.
2 1/16"
(52.4 mm)
GB Res./QR Recessed
Escutcheon
1 13/16" (46.0 mm)
CENTRAL
Minimum Hole in Ceiling is 2" (50.8 mm),
Maximum is 2 1/2" (63.5 mm)
Installation
All Central Model GBR Automatic Sprin-
klers must be installed according to current
NFPA 13, NFPA 13D and NFPA 13R re-
quirements and Central's Residential In-
stallation Guide. Deviations from these
requirements and standards or any alter-
ation to the sprinkler itself will void any
warranty made by Central Sprinkler Com-
pany. In addition, installation must also
meet local government provisions, codes,
and standards as applicable.
The system piping must be properly
sized to ensure the minimum required flow
rate at the sprinkler.
Check for the proper model, style, orifice
size, and temperature rating prior to instal-
lation. Install sprinklers after the piping is
in place to avoid mechanical damage; re-
place any damaged units. Wet pipe sys-
tems must be protected from freezing.
Figure 1
GBR Residential Concealed Pendent
Finished
Ceiling Line
Ceiling Opening
2 1/4" (52.7 mm)
+1/8" (3.2 mm)
-1/4" (6.4 mm)
1 3/8"
(34.9 mm)
+1/8" (3.2 mm)
-1/16" (6.4 mm)
Face of Reducing
Coupling
3/16"
(4.8 mm)
Min.
2 3/4" (69.9 mm)
GBR Cover Plate
(no substitutions)
CENTRAL
Figure 2
GBR & GBR-2 Residential Pendent
Figure3
GBR&GBR-2ResidentialRecessed
Pendent
1 3/16"
(30.2 mm)
1 3/4"
(44.5 mm)
Ref. 1 1/2"
(38.1 mm)
2 1/16"
(52.4 mm)
Face of Reducing
Coupling
CENTRAL
Note: Only the Model GB Res./QR Residential Recessed
Escutcheon may be used. Substitution of other “recessed”
escutcheons may impair the operating sensitivity and
distribution pattern.
Note: Central's Model 65 or 401 escutcheons may be used, but the maximum deflector
distance of 4" still applies. When using Central's Model 65 ceiling escutcheon, the face
of the reducing coupling should be 1/8" ±1/16" (3.2 mm ±1.6 mm) below ceiling line.
** The flow and pressure is due to U.L. modifying its standard to reflect the NFPA 13, 13D and 13R
1996 edition changes requiring a minimum of 7 psi (0.5 bar).
Note: The maximum deflector distance does not differ from the NFPA maximum of 4" (101.6 mm)
below the ceiling.
12' (3.7 m) or less 6' (1.8 m) or less 13 GPM (9.1 psi) **11.5 GPM (7.1 psi)
49.3 Lpm (0.6 bar) 43.6 Lpm (0.5 bar)
14' (4.3 m) 7' (2.1 m) 16 GPM (13.8 psi) 13.5 GPM (9.8 psi)
60.6 Lpm (0.9 bar) 51.2 Lpm (0.7 bar)
16' (4.9 m) 8' (2.4 m) 21 GPM (23.8 psi) 15 GPM (12.2 psi)
79.6 Lpm (1.6 bar) 56.9 Lpm (0.8 bar)
14' (4.3 m) or less 7' (2.1 m) or less 14 GPM (10.6 psi) **11.5 GPM (7.1 psi)
53.1 Lpm (0.7 bar) 43.6 Lpm (0.5 bar)
16' (4.9 m) 8' (2.4 m) 16 GPM (13.8 psi) 12 GPM (7.8 psi)
60.6 Lpm (0.9 bar) 45.5 Lpm (0.5 bar)
18' (5.5 m) 9' (2.7 m) 19 GPM (19.5 psi) 14 GPM (10.6 psi)
72.0 Lpm (1.3 bar) 53.1 Lpm (0.7 bar)
14' (4.3 m) or less 7' (2.1 m) or less 14 GPM (10.6 psi) **11.5 GPM (7.1 psi)
53.1 Lpm (0.7 bar) 43.6 Lpm (0.5 bar)
16' (4.9 m) 8' (2.4 m) 16 GPM (13.8 psi) 12 GPM (7.8 psi)
60.6 Lpm (0.9 bar) 45.5 Lpm (0.5 bar)
18' (5.5 m) 9' (2.7 m) 19 GPM (19.5 psi) 16 GPM (13.8 psi)
72.0 Lpm (1.3 bar) 60.6 Lpm (0.9 bar)
12' (3.7 m) or less 6' (1.8 m) or less 13 GPM (9.1 psi) **11.5 GPM (7.1 psi)
(Horiz. & Sloped Clgs) 49.3 Lpm (0.6 bar) 43.6 Lpm (0.5 bar)
14' (4.3 m) 7' (2.1 m) 18 GPM (17.5 psi) 14 GPM (10.6 psi)
(Horizontal Ceilings) 68.2 Lpm (1.2 bar) 53.1 Lpm (0.7 bar)
14' (4.3 m) 7' (2.1 m) 20 GPM (21.6 psi) 14 GPM (10.6 psi)
(Sloped Ceilings) 75.8 Lpm (1.5 bar) 53.1 Lpm (0.7 bar)
16' (4.9 m) 8' (2.4 m) 18 GPM (17.5 psi) 14 GPM (10.6 psi)
(Horizontal Ceilings) 68.2 Lpm (1.2 bar) 53.1 Lpm (0.7 bar)
16' (4.9 m) 8' (2.4 m) 20 GPM (21.6 psi) 14 GPM (10.6 psi)
(Sloped Ceilings) 75.8 Lpm (1.5 bar) 53.1 Lpm (0.7 bar)
18' (5.5 m) 9' (2.7 m) 20 GPM (21.6 psi) 16 GPM (13.8 psi)
Horiz. & Sloped Clgs) 75.8 Lpm (1.5 bar) 60.6 Lpm (0.9 bar)
20' (6.1 m) 10' (3.0 m) 20 GPM (21.6 psi) 16 GPM (13.8 psi)
(Horiz. & Sloped Clgs) 75.8 Lpm (1.5 bar) 60.6 Lpm (0.9 bar)
GBR 7/16"
(11.1 mm)
Concealed
Pendent
GBR 7/16"
(11.1 mm)
Pendent
GBR 7/16"
(11.1 mm)
Recessed
Pendent
GBR-2
Pendent &
Recessed
Pendent
(Listed for
both hori-
zontal and
sloped
ceilings.
See Page 2
for sloped
ceiling
design
guidelines.
Sprinkler Design Requirements
Minimum Design Flow (Pressure)
GB Sprinkler Wrench (Part #1099)
Model
Maximum
Spacing
Between
Sprinklers
Maximumum
Location
From Any
Wall One Sprinkler Two or More
Sprinklers
OBSOLETE

©1998 Central Sprinkler Company
Printed in U.S.A. GBR.4
Care &
Maintenance
Sprinklers must be handled carefully.
They must not be transported or stored
where ambient temperature may exceed
100°F/38°C. For best results, store them in
a cool, dry location in the original shipping
package.
Ordering
Information
Ordering Information: When
placing an order, indicate the full
product name. Please specify the
quantity, model, style, orifice size,
temperature rating, type of finish or
coating, and sprinkler wrench.
(Note: Protective plastic caps for
pendent style sprinklers are available
upon request.)
Availability and Service: Central
sprinklers, valves, accessories, and
other products are available throughout
the U.S. and Canada, and internation-
ally, through a network of Central
Sprinkler distribution centers. You may
write directly to Central Sprinkler
Company, or call [phone] for the
distributor nearest you.
Patents: Patents are pending.
Conversion Table:
1 inch = 25.400 mm
1 foot = 0.3048 M
1 pound = 0.4536 kg
1 foot pound = 1.36 Nm
1 psi = 6.895 kpa
= 0.0689 bar
= 0.0703 kg/cm2
1 U.S. gallon = 3.785 dm3
= 3.785 liters
Conversions are approximate.
Do not install sprinklers that have been
dropped or visibly damaged. Sprinklers
should never be painted, coated, plated, or
altered in any other way from manufac-
tured condition or they may not function
properly. Any sprinklers altered in such
manner must be replaced.
The owner is responsible for the proper
operating condition of all fire protection
devices and accessories. The NFPA stan-
dard 25 entitled, “Inspection, Testing and
Maintenance of Water-Based Fire Protec-
tion Systems” , contains guidelines and
minimum maintenance requirements. Fur-
thermore, the local Authority Having Juris-
diction may have additional regulations
and requirements for maintenance, testing,
and inspection that must be obeyed.
It is recommended that sprinkler sys-
tems be inspected regularly by a qualified
inspection service. Length of time be-
tween such inspections can vary due to
accessibility, ambient atmosphere, water
supply, and site activity.
Do not attempt to reassemble or other-
wise reuse a sprinkler that has operated.
Replace any sprinkler exhibiting corrosion
or damage; always use new sprinklers of
the same type and temperature rating as
replacements.
Because the discharge pattern is critical
to protection of life and property, nothing
should be hung or attached to the sprinkler
unit that would disrupt the pattern. Such
obstructions must be removed. In the
event that construction has altered the
original configuration, additional sprinklers
may need to be installed to maintain the
protection level.
Do not attempt to replace sprinklers
without first removing the fire protection
system from service. Be certain to secure
permission from all Authorities Having Ju-
risdiction, and notify all personnel who may
be affected during system shutdown. A
fire watch during maintenance periods is a
recommended precaution.
To remove the system from service
mode, first refer to the system operating
guide and valve instruction. Drain water
and relieve pressure in the pipes. Remove
the existing unit and install the replace-
ment, using only the special sprinkler
wrench. Be certain to match model, style,
orifice, and temperature rating.
A fire protection system that has been
shut off after an activation should be re-
turned to service immediately. Inspect the
entire system for damage and replace or
repair as necessary. Sprinklers that did
not operate but were subjected to corro-
sive elements of combustion or excessive
temperatures should be inspected, and
replaced if need be. The Authority Having
Jurisdiction will detail minimum replace-
ment requirements and regulations.
Guarantee: Central Sprinkler Company
will repair and/or replace any products
found to be defective in material or work-
manship within a period of one year from
the date of shipment. Please refer to the
current Price List for further details of the
warranty.
Upon completion of the installation, the
system must be tested per recognized
standards. In the event of a thread leak,
remove the unit, apply new pipe joint
compound or tape, and reinstall.
Installation Sequence
Step 1. The unit must be installed in the
pendent position.
Step 2. Use only a non-hardening pipe
joint compound or Teflon* tape. Apply only
to male threads.
* Teflon is a trademark of the DuPont Corp.
Step 3. Install the sprinkler according to
the dimensions shown in the installation
diagrams on pages two, three, four and five
of the technical bulletin. Install the escutch-
eon skirt onto the sprinkler prior to its en-
gagement into the reducing fitting. For re-
cessed applications, do not use the push-on
escutcheon plate to hold the unit in position.
The sprinkler will only function properly
when anchored to the building structure.
Step 4. Hand tighten the sprinkler into the
fitting. Use the appropriate Central Wrench
to tighten the unit into the fitting. A leak-
tight joint requires only 7 to 14 ft.-lbs. (9.5 to
19.0 Nm) of torque; a tangential force of 14
to 28 lbs. (62.3 to
124.5 N) delivered
through a 6" (152.4 mm) handle will deliver
adequate torque. Torque levels over 21 ft.-
lbs. (28.6 Nm) may distort the orifice seal,
resulting in leakage.
Caution: Special care must be taken
when installing sprinklers with a CPVC sys-
tem. Sprinklers must be installed after the
manufacturer's recommended setting time
for the primer and cement to ensure that
neither accumulate within the sprinkler.
Special care must be taken when install-
ing with a copper system. Sprinklers must
be installed only after the inside of the sprin-
kler drop and associated fittings have been
wire brushed to remove any flux. Residual
flux can cause corrosion and in extreme
cases can impair proper sprinkler operation.
Central Sprinkler Company
451 North Cannon Avenue, Lansdale, PA 19446
PHONE [phone]
FAX [phone]
OBSOLETE