CENTRAL GB User manual

Manufactured by: Central Sprinkler Company
451 North Cannon Avenue, Lansdale, Pennsylvania 19446
Product
Description
GB & GB-QR Dry Pendent
No. 5-5.0
Model: GB & GB-QR Dry Pendent
Style: Flush, Recessed & Extended
Wrench:
Offset (flush&extended) Part#1068
Universal
(recessedpendent) Part#1069
Orifice Size: 1⁄2" (12.7 mm)
K-Factor: See K-Factor Table on page 2.
Thread Size 1" (25 mm) N.P.T.
*Temperature Ratings & Bulb Color:
135°F/57°C Orange
155°F/68°C Red
175°F/79°C Yellow
200°F/93°C Green
250°F/121°C Blue
286°F/141°C Blue
360°F/182°C Purple
*Refertochart below forspecifictemperature
Listings.
Approvals: U.L., U.L.C.
Technical
Data
The Model GB and GB-QR Dry
Pendent Glass Bulb Sprinklers are
designed for use in special applica-
tions such as freezing environments
or in conditions where sediment or
foreign materials might accumulate in
ordinary drop nipples. They are
available in standard response (5mm
bulb) or quick response (3mm bulb).
A significant installation feature for
the extended version is the built in 3"
(76.2 mm) of adjustment. This allows
installation of common lengths and
can compensate for field variations.
A larger wrench boss allows the
sprinkler to be installed into the
branchline tee using a sprinkler
wrench. This allows easy installation
in “hard” ceilings such as sheet rock
as the barrel of the dry pendent
would be inaccessible.
The Model GB and GB-QR Dry
Pendents have a maximum adjust-
ment of ±11⁄2" (38.1 mm) in the
extended version, allowing ease of
field installation and ordering. Also,
the Model GB dry pendent is avail-
able recessed or flush for situations
that require a more aesthetic appear-
ance.
Operation: The glass bulb
capsule operating mechanism
contains a heat-sensitive liquid that
expands upon application of heat. At
the rated temperature, the frangible
capsule ruptures, thereby releasing
the orifice seal. The sprinkler then
discharges water in a pre-designed
spray pattern to control or extinguish
the fire.
GB & GB-QR Dry Pendent 1-98
Standard and Quick Response
Flush, Recessed and Extended
Glass Bulb Sprinkler
GB Flush & Extended GB Recessed GB-QR Flush & Extended GB-QR Recessed
135, 155, 175, 135, 155, 175 135, 155, 175, 135, 155, 175
200, 286, 360 200 200, 250 200
U.L. & U.L.C. Temperature Listings
Maximum Working Pressure:
175 psi (12.1 bar)
Factory Hydro Test: 100% at
500 psi (34.5 bar)
Standard Finishes:
Sprinkler: brass, chrome plated,
white
Escutcheon: brass, chrome plated
and white painted
1⁄2" (12.7 mm)
Orifice
Dry Pendent
Automatic
Sprinklers
Corrosion-Resistant Coatings (U.L.
Only) : white and black painted
Ceiling Opening: 2 1/4" (57.2 mm)
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2
Figure 2
Model GB and GB-QR Dry Pendent
Flush, Recessed
Figure 1
Model GB and GB-QR Dry Pendent
Extended
Dry Pendent Design Guidelines
To determine the K-factor, follow these steps:
1. Determine the K-factor length (NOT The “A” DIMENSION). The K-factor
is determined as follows:
Flush - “A” dimension +7⁄8" (22.2 mm) = length for K-factor.
Recessed - “A” dimension +3⁄8" (9.5 mm) = length for K-factor.
Extended - “A” dimension +31⁄2" (88.9 mm) = length for K-factor.
2. Determine the K-factor for that length by using the K-factor table.
3. Use the K-Factor at the tee in the branchline for the calculations.
Finished Ceiling
LIne
1" (25 mm)
Thread
“A”
Dimension
(order length)
Main Tube
2 1/2" (63.5 mm)
±1/8" (3.8 mm)
Ceiling Opening
1 15/16" (49.2 mm)
Inner Cup Dia.
If A is > 3 1/4" (82.6 mm) Dimension is 4 5/8" (117.5 mm) (±1 1/2" (38.1 mm)) If A is ≤3 1/4" (82.6 mm) Dimension is 3 5/8" (92.1 mm) (±3/4" (19.1 mm))
Caution: See step one of installation sequence for appropriate fitting requirements.
Ordering Length for Dry Pendent Heads
Flush — The “A” dimension is measured from the face of the tee to the finished ceiling. This is only approximately flush. Order
to the nearest 1⁄4" (6.4 mm). Minimum “A” dimension is 2" (50.8 mm).
Recessed — The “A” dimension is measured from the face of the tee to the finished ceiling. Minimum “A” dimension is 21⁄8"
(54.6 mm). Adjustment is ±3⁄16" (4.8 mm).
Extended — The “A” dimension is measured from the face of the tee to the finished ceiling. Follow one of these two options:
If the “A” dimension is less than or equal to 31⁄4" (82.6 mm), total adjustment is 11⁄2" (38.1 mm) (from the mid point of the
adjustment range ±3⁄4" (19.1 mm)). Order to the nearest 1⁄4" (6.4 mm). Minimum “A” dimension is 0".
If the “A” dimension is greater than 31⁄4" (82.6 mm), the total adjustment is 3" (76.2 mm) (from the mid point of the adjustment
range ±11⁄2" (38.1 mm)). Order to the nearest 1⁄4" (6.4 mm). Minimum “A” dimension is 31⁄4" (82.6 mm).
Length K-Factor (metric)
21⁄2" (63.5 mm) to less than 101⁄8" (76.4 mm) 5.3 (76.4)
101⁄8" (254.1 mm) to less than 175⁄8" (75.0 mm) 5.2 (75.0)
175⁄8" (447.7 mm) to less than 251⁄4" (73.5 mm) 5.1 (73.5)
251⁄4" (641.4 mm) to less than 323⁄4" (72.1 mm) 5.0 (72.1)
323⁄4" (831.9 mm) to less than 403⁄8" (70.7 mm) 4.9 (70.7)
403⁄8" (1025.5 mm) to less than 48" (1219.2 mm) 4.8 (69.2)
K-Factor Table
Finished Ceiling
LIne
1" (25 mm)
Thread
“A”
Dimension
(order length)
Main Tube
2 1/2" (63.5 mm)
±1/8" (3.8 mm)
Ceiling Opening
1 15/16"
(49.2 mm)
Inner Cup Dia.
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3
Design Requirements—Standard Applications
The Model GB or GB-QR Dry Pendent Sprinklers are intended for stan-
dard area coverages and standard flow and pressure requirements as
specified in current NFPA Standards.
Design
Data
All Model GB and GB-QR Dry
Pendent Automatic Sprinklers must
be installed according to current
NFPA 13 Standards. Deviations from
these requirements and standards or
any alteration to the sprinkler itself
will void any warranty made by
Central Sprinkler Company. In
addition, installation must also meet
local government provisions, codes
and standards as applicable.
Dry pendent sprinklers are
designed to prevent water from
accumulating in drops to sprinklers.
To accomplish this, they have a fitting
that protrudes into the branch line
that allows the plug to sit above the
water line, if there is any residual
water, and operate without the
potential of freezing. Always install
dry sprinklers in a threaded tee.
Check for the proper model, style,
orifice size, and temperature rating
prior to installation. Install sprinklers
after the piping is in place to avoid
mechanical damage; replace any
damaged units.
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
into a threaded, cast iron, ductile
iron, or malleable iron tee only. It
may be installed into the run or
outlet of this tee. Do not install
into an elbow or mechanical tee.
Step 2. Use only a non-hardening
pipe joint compound or Teflon* tape.
Apply only to the male threads.
*Teflon is a trademark of the DuPont Corp.
Step 3. Hand tighten the sprinkler
into the fitting. Use the appropriate
Central Sprinkler Wrench to tighten
the unit in 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" (150 mm)
handle will deliver adequate torque.
Torque levels over 40 ft. lbs. (54.4
Nm) may twist the head in the main
tube, damaging the seal. The Model
GB Dry Pendent can be installed by
using the correct wrench on either the
sprinkler wrench boss or the barrel of
the dry pendent.
Step 4. To install the escutcheon
plate, align it with and push it over the
sprinkler body and into the upper
support piece until the outer edge of
the escutcheon meets the mounting
surface. The recessed escutcheon
tool may be used to install the
escutcheon plate easily from the floor.
Do not over- or under-tighten the
sprinkler to compensate for
inaccurate escutcheon plate
adjustment.
Caution: If installing in a CPVC
system, appropriate adaptation must
be made to insure that the dry pen-
dent is being installed into a threaded,
cast iron, ductile iron, or malleable iron
tee only. Special care must be taken
when installing with a CPVC system.
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
installing with a copper system.
Sprinklers must be installed only after
the inside of the sprinkler 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.
Care &
Maintenance
Sprinklers must be handled care-
fully. They must not be transported
or stored where ambient temperature
may exceed 100°F/38°C. For best
results, store them in a dry, cool
location in the original shipping
package.
Do not install sprinklers that have
been dropped or visibly damaged,
such as a crack in a glass bulb or a
loss of liquid from the bulb. Sprinklers
should never be painted, coated,
plated or altered in any other way
from manufactured condition or they
may not function properly. Any
sprinklers altered in such a manner
must be replaced.
The owner is responsible for the
proper operating condition of all fire
protection devices and accessories.
The NFPA standard 25 entitled,
“Inspection, Testing and Maintenance
of Water-Based Fire Protection
Systems” , contains guidelines and
minimum maintenance requirements.
Furthermore, the local Authority
Having Jurisdiction may have addi-
tional regulations and requirements
for maintenance, testing, and inspec-
tion that must be obeyed.
It is advisable to have sprinkler
systems inspected regularly by a
qualified inspection service. Length
of time between such inspections can
vary due to accessibility, ambient
atmosphere, water supply, and site
activity.
Do not attempt to reassemble or
otherwise reuse a sprinkler that has
operated. Replace any sprinkler
exhibiting corrosion or damage;
always use new sprinklers of the
same orifice, style, 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 should be installed to
maintain the protection level.
Installation
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©1998 Central Sprinkler Company
Printed in U.S.A.
Central Sprinkler Company
451 North Cannon Avenue, Lansdale, PA 19446
Phone: [phone]
FAX: [phone] GB Dry Pendent.2
Ordering Information: When
placing an order, indicate the full
product name. Please specify the
quantity, model, style, orifice size,
temperature rating, sprinkler finish,
and escutcheon finish.
Order dry pendents by the “A”
dimension.
Availability and Service: Central
sprinklers, valves, accessories and
other products are available through-
out the U.S. and Canada, and interna-
tionally, 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.
Ordering
Information
Do not attempt to replace sprinklers
without first removing the fire protec-
tion system from service. Be certain
to secure permission from all Authori-
ties Having Jurisdiction , 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,
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 replacement, using only the
recommended 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 repaired and returned to
service immediately. Inspect the
entire system for damage and replace
or repair as necessary. Sprinklers
that did not operate but were sub-
jected to corrosive elements of
combustion or excessive tempera-
tures should be inspected, and
replaced if need be. The Authority
Having Jurisdiction will detail mini-
mum replacement requirements and
regulations.
Guarantee: Central Sprinkler
Company will repair and/or replace
any products found to be defective in
material or workmanship within a
period of one year from the date of
shipment. Please refer to the current
Price List for further details of the
warranty.
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