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
(recessed pendent) 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
* Refer to chart below for specific temperature
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 ±1
1
⁄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)
OBSOLETE

CENTRAL GB Specifications

General

Brand	CENTRAL
Model	GB
Category	Irrigation System
Language	English

Summary

Product Description

Operation

Describes the glass bulb capsule operating mechanism and its function.

Technical Data

Temperature Ratings and Bulb Color

Lists temperature ratings and corresponding bulb colors.

Ordering Length for Dry Pendent Heads

Flush Type Ordering Length

Details 'A' dimension measurement for flush types.

Recessed Type Ordering Length

Details 'A' dimension measurement for recessed types.

Extended Type Ordering Length

Details 'A' dimension measurement for extended types.

Dry Pendent Design Guidelines

Determine K-Factor Length

Steps to determine K-factor length based on sprinkler type.

Determine K-Factor from Table

How to find the K-factor using the provided table.

Use K-Factor in Calculations

Application of K-factor in branchline calculations.

Design Data

Design Requirements

Standard application requirements for GB/GB-QR sprinklers.

Installation

Installation Requirements

General requirements for installing GB/GB-QR sprinklers.

Installation Sequence

Step-by-step instructions for installing the sprinkler.

Care & Maintenance

Handling and Storage

Guidelines for careful handling and proper storage.

Sprinkler Alterations

Prohibits painting, coating, or altering sprinklers.

Maintenance Responsibilities

Owner's responsibility for operating condition and inspections.

System Inspection

Advises regular inspection by qualified services.

Post-Activation Procedures

Procedures for replacing operated or damaged sprinklers.

Discharge Pattern Integrity

Ensures nothing obstructs the sprinkler's discharge pattern.

Ordering Information

System Shutdown and Replacement

Steps for removing system from service and replacing units.

Post-Activation System Repair

Ensures systems are repaired and returned to service after activation.

Guarantee and Warranty

Details the company's repair/replacement warranty.

How to Order

Specifies information needed when placing an order.

Availability and Service

Information on product availability and how to contact for service.