WATER SUPPLY PRESSURE IN PSI
GRAPH B
DOUBLE INTERLOCK PREACTION SYSTEM
AIR PRESSURE REQUIREMENTS
tween the system air pressure and the
Dry Pilot Actuator is made directly
through the Accelerator Trim. The
F311 Accelerator automatically ad-
justs to small as well as slow changes
in system pressure, but trips when
there is a rapid and steady drop in
pressure (such as will occur when a
sprinkler operates). Upon tripping, the
F311 Accelerator will relieve system
air pressure from the Dry Pilot Actuator
faster than it can be replenished
through the 3/32 inch (2,4 mm) diame-
ter orifice in the clapper of the l/2 inch
(15 mm) Swing Check Valve (E - Fig.
C), resulting in quick opening of the
Dry Pilot Actuator following a sprinkler
operation.
The Model F311 Accelerator is de-
scribed in Technical Data Sheet
TD109.
The deluge valve, swing check valve,
and all interconnecting piping must be
installed in a readily visible and acces-
sible location and in an area which can
be maintained at a minimum tempera-
ture of 4O’F/4’C.
NOTE
Heat tracing is not permitted for the
deluge valve, swing check valve, or
any of the interconnecting piping.
Heat tracing will promote the forma-
tion of hardened mineral deposits
which can prevent valve operation.
Heat tracing can also result in dam-
age to the F470 Deluge Valve Dia-
phragm Assembly.
The 4 and 6 inch (100 and 150 mm)
Electric/Pneumatic Double Interlock
Preaction Systems must be installed in
accordance with the following instruc-
tions. Proper operation of the Double
Interlock Preaction System depends
upon it being installed in accordance
with the instructions given below. Fail-
ure to follow these instructions may
prevent the devices from functioning
properly as well as void listings, ap-
provals, and the manufacturer’s war-
ranties.
1. All pipe thread connections must
be free of scale and burrs before
installation. Use pipe thread seal-
ant sparingly on male pipe threads
only.
2. The F470 Deluge Valve must be
installed vertically as shown in Fig-
ure B and C.
3. To attach the lower flange of the
F520 or F5201 Check Valve to the
upper flange of the F470 Deluge
Valve, as shown in Figure B, at
least four out of the eight required
flange fasteners must be stud bolts
and nuts. The stud bolts must be
5/8”-11 UNC x 3-l/4” long for4 inch
(100 mm) valves and 3/4”-10UNC
;a;;3f” long for 6 inch (150 mm)
4. Install the (Wet Pilot) Actuation
Trim as specifie.d by TDl16 and
then the Double Interlock Preac-
tion Trim as shown in Figure C.
Care must be taken to make sure
that check valves, globe valves,
etc. are installed with the flow ar-
rows in the proper direction.
Drain tubing to the Drip Funnel
must be installed with smooth
bends that will not restrict flow.
5. Attach the Model F470 Double In-
terlock Label (11 - Fig. C) to the 2
inch high x 4 inch (50 x 200 mm)
wide nameplate mounting pad on
-5-
the Handhole Cover of the
F52OIF5201 Swing Check Valve.
Place the Label over the man-
ufacturer’s logo nameplate, if one
is located on the pad.
6. The Diaphragm Chamber Supply
Connection (Fig. C) must be con-
nected to the water supply side of
the System Main Control Valve to
facilitate setting of the F470 Del-
uge Valve.
7. Connect the Air Supply Connec-
tion to an air or nitrogen supply.
Use of an automatic air or nitrogen
maintenance device is recom-
mended and may be required by
the Authority Having Jurisdiction.
Refer to Graph B for Double Inter-
lock Preaction System air pressure
requirements.
An air dryer, when specified, is to
be installed as required by the Au-
thority Having Jurisdiction.
8. Install, as applicable, the optional
Double Interlock Accelerator Trim
as shown in Figure C.
The drain tubing must be installed
with smooth bends that will not re-
strict flow.
The connection to the system pip-
ing must be located on the supply
side of the System Shut-off Valve
(Fig. A) and at least two feet above
the F52OIF5201 Check Valve, so
that drain back/condensate will not
flow into the Accelerator piping.
Connections to a feed or cross
main must be made either to the
side or top of the main.
After installing the F311 Accelera-
tor, close the Accelerator Control
Valve.
NOTES
Failure to follow the above in-
structions can result in accidental
tripping of the Accelerator.
The Accelerator Control Valve
must be closed during hydrostatic
testing of the system to prevent
internal damage to the F311 Ac-
celerator.
9. The Low Air Pressure Alarm
Switch (Fig. C) is to be adjusted to
operate on falling pressure at ap-
proximately 6 psi (0,4 bar) below
the minimum Double Interlock Dry
System air pressure requirement
shown on Graph B.
10. The Pressure Relief Valve (5 - Fig.
C) is factory set to relieve at a
pressure of approximately 45 psi
(3,l bar), which can typically be
used for a maximum system pres-
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