which holds the Clapper down in the
set position is reduced to below the
valvetrippoint.
Dry pilot sprinklers are to be minimum
1/2 inch (15 mm) orifice listed or ap-
proved automatic sprinklers. Manual
Control Stations are to be either the
Model F180 or F184 described in Tech-
nical Data Sheet TD121.
Graph C shows the “minimum pilot line
service pressure” as a function of the
water supply pressure.The pressure in
the dry pilot actuation system must be
automatically maintained using one of
the following maintenance devices, as
appropriate.
• Model F324 Air Maintenance De-
vice (pressure reducing type), re-
fer to Technical Data Sheet
TD111.
• Model F326 Air Maintenance De-
vice (compressor control type), re-
fer to Technical Data Sheet
TD112.
• Model F328 Nitrogen Mainte-
nance Device (high pressure re-
ducing type), refer to Technical
Data Sheet TD113.
NOTES
The dewpointof thepilotlineair pres-
sure must be maintained below the
lowest ambient temperature to which
the dry pilot actuation system will be
exposed.Accumulation of water in the
pilot line connection to the Actuator
will lower the air pressure at which
the Actuator will open and possibly
prevent proper operation. Also, intro-
ductionofmoisture into thepilot lines
exposed to freezing temperatures can
createanice buildupwhichcouldpre-
vent proper operation of the Actuator.
An air dryer must be installed where
the moisture content of the air supply
is not properly controlled at less than
therequiredvalue.Thedesiccantdryer
with mounting accessories described
inTechnicalDataSheetTD135issuit-
able for use with a maximum inlet
pressure of 150 psi (10,3 bar) and for
drying system air down to a dewpoint
of less than -20°F/-29°C at a pressure
of 45 psi (3,1 bar).
It is recommended that an F328 Ni-
trogenMaintenanceDevicebe utilized
in dry pilot actuation system applica-
tions where the dewpoint must be
maintained below -20°F/-29°C. See
Technical Data Sheet TD113.
Itisrecommendedthatinternallygal-
vanized pipe and cast iron fittings be
used for dry pilot lines.
Supervision of the pressure in the dry
pilot actuation system and/or alarm
which separately indicates operation
of the detection system is recom-
mended and may be required by the
authority having jurisdiction. A dual
setting low pressure alarm switch,
such as the unit described in Technical
Data Sheet TD210, is suitable for the
service. The recommended pressure
settings are as follows:
• Low pressure alarm setting at
approximately 6 psi (0,4 bar)
below the minimum pilot line
service pressure requirement
shown in Graph C.
• Fire alarm setting at approxi-
mately 15 psi (1,0 bar) below
the minimum pilot line service
pressure requirement shown
in Graph C.
The Pressure Relief Valve (Ref. Item
D5 - Fig. D) is factory set to relieve at
a pressure of approximately 45 psi (3,1
bar); however, it may be field adjusted
to a lower pressure, if required.
Electric Actuation Trim
(Figure D, Items 1 through 38 plus
Items E1 through E5)
The Electric Actuation Trim is required
for electric operation of the F470H
Valve by a detection system consisting
of electrical devices such as heat sen-
sitive thermostats, smoke detectors,
and/or electric manual pull stations.
Information on the various types of So-
lenoid Valves that may be used with
this trim package is given in Technical
Data Sheet TD119. A listed and ap-
proved, 24VDC Solenoid Valve for
non-hazardous locations is supplied
as standard. Minimum clearance di-
mensions for the Electric Actuation
Trim are shown in Figure C.
NOTE
ApprovalbyFactoryMutualiscontin-
gent on the use of an FM Approved
24VDC Solenoid Valve. FM only ap-
proves solenoid valves for use in non-
hazardous locations.
The Electric Actuation Trim is only to
be used in conjunction with an electric
deluge valve releasing panel (auto-
matic control unit) that is listed or ap-
proved (as appropriate) for fire protec-
tion system releasing service. In
addition, the deluge valve releasing
panel is only to be operated by listed
or approved (as approriate) fire detec-
tors.
Operation of an electrical device such
as a heat sensitive thermostat, smoke
detector, or electrical manual control
station signals the deluge valve releas-
ing panel to energize the Solenoid
Valve. In turn, the energized Solenoid
Valve opens resulting in a rapid pres-
sure drop in the Diaphragm Chamber
of the F470H Valve, and the force dif-
ferential applied through the Clapper
Latch which holds the Clapper down in
the set position is reduced to below the
valvetrippoint.
NOTE
Consult with the Authority Having
Jurisdiction regarding installation
criteria pertaining to electric actua-
tion circuitry.
-5-
GRAPH C
DRY PILOT LINE PRESSURE REQUIREMENTS
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