See section "I" on the next page. Prior
to installation, sprinklers must be
stored in a cool, dry place in their
original shipping container. Never in-
s ta l l sp ri nk l e rs th at ha ve be en
dropped, damaged in any way, or
have been exposed to temperatures
in excess of maximum ambient tem-
perature allowed. Such sprinklers
should be destroyed immediately.
C. Extended Coverage Horizon
®
Mi-
rage
®
Concealed Sprinklers must be
installed in neutral or negative pres-
sure plenums only.
D. Use care when locating sprinklers
near fixtures that can generate heat.
Do not install sprinklers where they
will be exposed to temperatures that
exceed the maximum recommended
ambient temperature for the tem-
perature rating used.
E. Viking Horizon
®
Mirage
®
Concealed
Sprinklers are not intended for use in
corrosive environments. Use only
sprinklers listed for corrosive environ-
ments when subject to corrosive at-
mospheres.
F. Adequate heat must be provided
when Viking Extended Coverage Ho-
rizon
®
Mirage
®
Concealed Sprinklers
are installed on wet pipe systems.
When installing Viking Extended
Coverage Horizon
®
Mirage
®
C on-
cealed Sprinklers on dry systems, re-
fer to appropriate installation guides.
G. The sprinklers must be installed after
the piping is in place to prevent me-
chanical damage. Before installing,
be sure to have the appropriate sprin-
kler model and style, with the correct
orifice size, temperature rating, and
response characteristics. Install the
sprinklers according to the following
steps:
1. Install all piping and cut the sprin-
kler drop nipple to position the
outlet of the reducing coupling at
the desired elevation. The drop
nipple must be perpendicular to
the ceiling and centered in a 2"
(50 mm) diameter opening in the
ceiling.
2. With the sprinkler in the plastic
protective shell, apply a small
amount of pipe-joint compound or
tape to the external threads of the
sprinkler only, taking care not to
allow a build-up of compound in
the sprinkler inlet.
3. Use only the special wrenches
designed for installing Viking Ho-
rizon
®
Mirage
®
Concealed Sprin-
klers. With the sprinkler in the
plastic protective shell, place the
unit into the wrench.
4. Turn the unit clockwise to thread
the sprinkler into the outlet of the
coupling. DO NOT use the fusible
link to start or thread the sprinkler
into a fitting.
H. After installation, the entire system
must be tested in accordance with
the recognized installation stand-
ards. The test is applied after the
sprinkler installation to ensure no
damage has occurred to the sprinkler
during shipping and installation, and
to make sure the unit has been prop-
erly tightened. If a thread leak should
occur, normally the unit must be re-
moved, new pipe-joint compound or
tape applied, and then reinstalled.
This is due to the fact that when the
joint seal leaks, the sealing com-
pound or tape is washed out of the
joint.
I. After testing, repairing all leaks, and
installation and painting of the ceiling,
the cover plate assembly may be at-
tached.
1. Remove the cover from the pro-
tective box, taking care not to
damage the cover plate assem-
bly.
2. Remove the plastic protective
shell from the sprinkler. NOTE: It
is recommended to retain a pro-
tective shell in the spare sprinkler
cabinet. The internal diameter of
the special Horizon
®
Mirage
®
Concealed Sprinkler Installation
Wrenches are designed for use
with the sprinkler contained in a
protective shell.
3. From below the ceiling, gently
place the base of the cover plate
assembly over the threaded body
of the sprinkler protruding through
the 2" (50 mm) diameter hole in
the ceiling.
4. Push the cover plate assembly
onto the sprinkler until the unfin-
ished brass flange of the cover
plate base touches the ceiling.
The maximum adjustment available
is 1/2" (12,7 mm). DO NOT MODIFY
THE UNIT. If necessary, re-cut the
sprinkler drop nipple.
J. DISASSEMBLY: The "thread off" de-
sign of the cover plate assembly al-
lows the cover plate assembly to be
removed and reinstalled to permit
temporary removal of ceiling panels
without taking the sprinkler system
out of service and removing the sprin-
kler. To remove the cover plate as-
sembly:
1. From below the ceiling, grasp the
cover plate and gently turn it
counterclockwise.
If it is necessary to remove the entire
sprinkler, the system must be re-
moved from service. See Mainte-
TECHNICAL DATA
Sprinkler 87 c
February 11, 1999
HORIZON
®
MIRAGE
®
EXTENDED COVERAGE
20 ft x 20 ft (6,1 m x 6,1 m)
CONCEALED SPRINKLERS
Figure E:
Installation of 3/4" (20 mm) NPT Sprinkler
Figure D:
Installation of 1/2" (15 mm) NPT Sprinkler
1/2"
(15 mm)
NPT
2-1/4"
(57,2 mm)
2" (50 mm)
diameter hole
required.
2-3/4"
(69,8 mm)
Maximum
2-1/4"
(57,2 mm)
Minimum
2-3/4"
(69,8 mm)
2" (50 mm)
diameter hole
required.
2-7/16"
(61,9 mm)
Minimum
2-3/4"
(69,8 mm)
3/4"
(20 mm)
NPT
2-7/16"
(61,9 mm)
2-15/16"
(74,6 mm)
Maximum
OBSOLETE
