3
Design
Data
The Central GB4-EC and GB4-
QREC must be installed in conform-
ance with current NFPA 13 Standards
and this data sheet. Deviations from
these requirements and standards, or
any alteration to the sprinkler assem-
bly itself will void any warranty made
by Central Sprinkler Company. In
addition, installation must also meet
local government provisions, codes
and standards, as applicable.
The system piping must be prop-
erly sized to ensure the minimum
required flow rate at the sprinkler.
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. Wet pipe systems
must be protected from freezing.
Upon completion of the installation,
the system must be tested per
recognized standards. In the event of
a thread leak, remove the unit, apply
Installation
Listing/
Sprinkler
Coverage Area Min. Flow Min. Pressure
Approval
Designation
(sq. ft.)
(
gpm)
(psi)
Temperature
UL, cUL, MEA
GB4-EC
16' x 16'
26
21.6
155
°
F & 200
°
F
UL, cUL, MEA
GB4-EC
18' x 18'
33
32.7
155
°
F
Design Requirements - Extended Coverage Applications
155
°
F/68
°
C and 200
°
F/93
°
C 5mm Bulb
The Model GB4-EC Royal Flush™ Concealed Pendent Sprinklers are UL, cUL and
MEA Listed for Extended Coverage applications in light hazard occupancies only.
new pipe joint compound or tape, and
reinstall.
Installation Sequence
Step 1. The unit must be installed in
the pendent position.
Step 2. The face of the sprinkler fitting
should be installed a nominal 2" (
±
1
⁄
4
")
behind the finished ceiling line. Ad-
justments, to compensate for varia-
tions in fitting face to ceiling height,
may be made by threading the cover
plate retainer in and out of the unit’s
support cup.
Step 3. 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 4. Hand tighten the sprinkler into
the fitting. Avoid making contact with
the deflector when using the Central
Sprinkler GB4 or Universal Wrench to
tighten the unit into the fitting. The
Universal Wrench is designed to mate
with the frame’s wrench bosses, inside
Listing/
Sprinkler
Coverage Area Min. Flow Min. Pressure
Approval
Designation
(sq. ft.)
(
gpm)
(psi)
Temperature
UL, cUL, MEA
GB4-QREC
16' x 16'
26
21.6
155
°
F & 200
°
F
UL, cUL, MEA
GB4-QREC
18' x 18'
33
32.7
155
°
F & 200
°
F
The Model GB4-QREC Royal Flush™ Concealed Pendent Sprinklers are UL, cUL and
MEA Listed for Quick Response Extended Coverage applications in light hazard
occupancies only.
Design Requirements - Quick Response Extended Coverage Applications
155
°
F/68
°
C and 200
°
F/93
°
C 3mm Bulb
GB4 Wrench (Part #1075)
the threaded support cup. A leak
tight joint requires a only 7 to 14 ft.
lbs. of torque. Torque levels greater
than 21 ft. lbs. may distort the orifice
seal, resulting in leakage.
Step 5. To install the ceiling cover
plate, manually thread the cover
retainer into the support cup. Con-
tinue threading until the cover
retainer’s flange rests against the
surface of the ceiling.
Caution: Special care must be
taken when installing with a CPVC
system. Sprinklers must be installed
after the manufacturer's recom-
mended 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.
The minimum distance between sprinklers does not differ from NFPA 13. (6'-0")
Ceiling cover plates are available in a variety of metallic or painted finishes. For custom painted finishes, the customer
must furnish a quick-drying paint, preferably lacquer-based, to ensure proper color duplication. One quart of paint is
required for each 200 plates.
OBSOLETE
