3
Design Requirements—Standard Applications
The Model A-1 Flush, Recessed, Extended and Concealed Adjustable Dry
Pendent Sprinklers are intended for standard area coverages and standard flow
and pressure requirements as specified in current NFPA Standards.
Installation
Technical
Data
obtained by applying the sprinkler
head wrench and turning either
clockwise or counterclockwise. Note
that no locking is required when the
sprinkler is in its desired position.
Step 5. To install the recessed
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.
To install the concealed ceiling
cover plate, align the dimples of the
support ring assembly with the slots
of the upper support shell assembly.
Push upward and twist to the right.
Do not over- or under-tighten the
sprinkler to compensate for inaccu-
rate escutcheon plate adjustment.
Caution: 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.
Combination Wrench Part #1106
Universal Wrench Part #1122
not attached to the sprinkler assem-
bly in the factory as this fitting must
be made into the sprinkler line fitting
first. Warning: Do not over-tighten
special cast iron fitting into the
branch line fitting or breakage will
result. The sprinkler assembly is
attached to the special cast iron fitting
by screwing the threaded connector
tightly. This is done by using a pipe
wrench on the threaded connector.
Never wrench on the sprinkler head
itself for tightening the threaded
connector into the special cast iron
fitting. The Model 1106 (recessed) or
the Model 1122 (concealed) sprinkler
wrench may be used on the sprinkler
for adjustment purposes only (see
Step #4).
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. Adjustment in length is
All Model A-1 Adjustable Dry
Pendent Automatic Sprinklers must
be installed according to current
NFPA 13 Standards.
Deviations from these require-
ments 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.
For standard applications the
system piping may be hydraulically
calculated or pipe-scheduled. 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 new pipe joint
compound or tape, and reinstall.
Installation Sequence
Step 1. The unit must be installed in
a pendent position.
Step 2. The special cast iron fitting is
OBSOLETE
