3
3 3/16"
ELO .64
1 3/4"
Figure 3
ELO-231 S.A. GB Upright Sprinkler
Figure 4
ELO-231 S.A. GB Pendent Sprinkler
ELO .64
3 3/16"
1 1/4"
5.
1
⁄
2
" thread must only be used on
retrofit applications.
Factory Mutual's Loss Prevention
Data Sheets contain the requirements
for designs that differ from NFPA.
Product
Description
The Model ELO-231 x
1
⁄
2
" Sprinkler
incorporates the “center-strut” actuating
assembly or a glass bulb heat responsive
element.
Center Strut Operation: A fusible alloy
is sealed into a bronze center strut by a
stainless steel ball. When the alloy melts
at its rated temperature, the ball is forced
upward into the center strut, releasing the
two ejectors and operating the sprinkler.
Unlike most other sprinkler designs, the
alloy is not exposed to atmospheric
conditions that could affect its proper
functioning. It is also less susceptible to
mechanical damage since there are no
protruding elements, extending beyond
the sprinkler frame.
Glass Bulb Operation: The Model ELO-
231 now incorporates the latest in heat
responsive glass bulb technology. The
operating mechanism consists of a liquid-
filled 5mm diameter frangible capsule that
is only 2.0 cm in length. The glass bulb
capsule operating mechanism contains a
heat sensitive liquid that expands upon
application of heat. At the rated tempera-
ture, the frangible capsule ruptures
thereby releasing the orifice seal, thus
operating the sprinkler.
Installation
All Central Model ELO-231 sprinklers
must be installed according to current
NFPA 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.
The system piping must be properly
sized to insure the minimum required flow
rate at the sprinkler. Check for the proper
model, style, orifice size, and temperature
rating prior to installation. Install sprin-
klers after the piping is in place to avoid
mechanical damage; replace any
damaged units.
Finish
Wax Over
Brass Chrome White Wax Lead Lead
ELO-231
(strut)
x
x
x
x
x
SSU
165
°
, 212
°
, 286
°
ELO-231
(strut)
x
x
SSU
165
°
, 212
°
, 286
°
ELO-231
(GB)
x
x
‡x
*x
x
*x
SSU & SSP
155
°
, 200
°
, 286
°
FM Approvals
‡ Upright only.
* Available upon special request.
UL & ULC Listings
Finish
Wax Over
Brass Chrome White Wax Lead Lead
ELO-231
(strut)
x
x
x
x
x
SSU & SSP
165
°
, 212
°
, 286
°
ELO-231
(GB)
x
x
x
SSU & SSP
155
°
, 200
°
, 286
°
Note: White, wax, lead and wax-over-lead are UL Listed as corrosion resistant.
OBSOLETE
