Operation
When exposed to heat from a fire, the
Cover Plate, which is normally sol-
dered to the Retainer at three points,
falls away to expose the Sprinkler As-
sembly. At this point the Deflector sup-
ported by the Guide Pins drops down
to its operational position.
The glass Bulb contains a fluid that
expands when exposed to heat. When
the rated temperature is reached, the
fluid expands sufficiently to shatter the
glass Bulb, activating the sprinkler and
allowing water to flow.
Design
Criteria
The RFII (TY3551 & TY3504), 5 mm
Bulb Type, Concealed Pendent Sprin-
klers are UL and C-UL Listed as stand-
ard response - standard spray sprin-
klers for use in accordance with the
current NFPA standard. They are FM
Approved as standard response -
standard spray sprinklers for use in
accordance with the current FM Loss
Prevention Data Sheets.
The RFII (TY3531 & TY3505) 3 mm
Bulb Type, Concealed Pendent Sprin-
klers are UL and C-UL Listed as quick
response - standard spray sprinklers
for use in accordance with the current
NFPA standard. They are FM Ap-
proved as standard response - stand-
ard spray sprinklers for use in accord-
ance with the current FM Loss
Prevention Data Sheets.
The Series RFII Concealed Pendent
Sprinklers are only listed and ap-
proved with the Series RFII Concealed
Cover Plates having a metallic or white
painted finish.
The Series RFII must not be used in
applications where the air pressure
above the ceiling is greater than that
below. Down drafts through the Sup-
port Cup could delay sprinkler opera-
tion in a fire situation.
Installation
The Series RFII must be installed in
accordance with the following instruc-
tions:
NOTES
Do not install any bulb type sprinkler if
the bulb is cracked or there is a loss of
liquid from the bulb. With the sprinkler
held horizontally, a small air bubble
should be present. The diameter of the
air bubble is approximately 1/16 inch
(1,6 mm) for the 155°F/68°C and 3/32
inch (2,4 mm) for the 200°F/93°C tem-
perature ratings.
A leak tight 1/2 inch NPT sprinkler joint
should be obtained with a torque of 7
to 14 ft.lbs. (9,5 to 19,0 Nm). A maxi-
mum of 21 ft.lbs. (28,5 Nm) of torque
is to be used to install sprinklers.
Higher levels of torque may distort the
sprinkler inlet with consequent leak-
age or impairment of the sprinkler.
Do not attempt to compensate for in-
sufficient adjustment in the Sprinkler
Assembly by under- or over-tightening
the Sprinkler/Support Cup Assembly.
Readjust the position of the sprinkler
fitting to suit.
Step 1.
The sprinkler must only be
installed in the pendent position and
with the centerline of the sprinkler per-
pendicular to the mounting surface.
Step 2.
Remove the Protective Cap.
Step 3.
With pipe thread sealant ap-
plied to the pipe threads, hand tighten
the sprinkler into the sprinkler fitting.
Step 4.
Wrench tighten the sprinkler
using only the RFII Sprinkler Wrench
(Ref. Figure 3). The RFII Sprinkler
Wrench is to be applied to the Sprin-
kler as shown in Figure 3.
Step 5.
Replace the Protective Cap
(Ref. Figure 4) by pushing it upwards
until it bottoms out against the Support
Cup. The Protective Cap helps prevent
damage to the Deflector and Arms dur-
ing ceiling installation and/or during
application of the finish coating of the
ceiling. It may also be used to locate
the center of the clearance hole by
gently pushing the ceiling material up
against the center point of the Protec-
tive Cap.
NOTE
As long as the Protective Cap remains
in place, the system is considered to
be “Out of Service”.
Step 6
. After the ceiling has been com-
pleted with the 2-1/2 inch (63,5 mm)
diameter clearance hole and in prepa-
ration for installing the Cover Plate As-
sembly, remove and discard the Pro-
tective Cap, and verify that the
Deflector moves up and down freely. If
the Sprinkler has been damaged and
Page 2 of 4
TFP181
FIGURE 1
SERIES RFII CONCEALED SPRINKLER
ASSEMBLY
GUIDE
DEFLECTOR
(DROPPED
POSITION)
PINS (2)
SCREW
COMPRESSION
DEFLECTOR
ROLL FORMED
THREADS
CUP WITH
SUPPORT
FRAME
1/2" NPT
CAP
BULB
SEALING
ASSEMBLY
SPRINKLER/SUPPORT CUP
ASSEMBLY
RETAINER
WITH THREAD
DIMPLES
SPRING
EJECTION
TABS (3)
SOLDER
COVER PLATE/RETAINER
ASSEMBLY
COVER
PLATE
THREAD INTO
UNTIL MOUNTING
SUPPORT CUP
SURFACE IS
FLUSH WITH
CEILING
* Registered Trademark of DuPont
OBSOLETE
