CENTRAL GB Manual

GB & GB-QR Dry Pendent
Standard and Quick Response
Flush, Recessed and Extended
Glass Bulb Sprinkler
Manufactured by: Central Sprinkler Company
451 North Cannon Avenue, Lansdale, Pennsylvania 19446
Product
Description
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 ±1
1
⁄ " (38.1 mm) in the
2
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
Technical
Data
Model: GB & GB-QR Dry Pendent
Style: Flush, Recessed & Extended
Wrench:
Offset (flush & extended) Part #1068
Universal (recessed pendent) Part #1069
1
Orifice Size: ⁄ "
(12.7 mm)
2
K-Factor: See K-Factor Table on page 2.
Thread Size 1" N.P.T.
(25 mm)
*Temperature Ratings & Bulb Color:
135°F/57°C
155°F/68°C
175°F/79°C
200°F/93°C
250°F/121°C
286°F/141°C
360°F/182°C
* Refer to chart below for specific temperature
Listings.
Approvals: U.L., U.L.C.
U.L. & U.L.C. Temperature Listings
GB Flush & Extended GB Recessed GB-QR Flush & Extended GB-QR Recessed
135, 155, 175, 135, 155, 175
200, 286, 360
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
Orifice
Orange
Dry Pendent
Red
Yellow
Green
Automatic
Blue
Blue
Sprinklers
Purple
135, 155, 175,
200 200, 250
Corrosion-Resistant Coatings (U.L.
Only) : white and black painted
Ceiling Opening: 2 1/4" (57.2 mm)
1-98
(12.7 mm)
135, 155, 175
200
No. 5-5.0