maintained below -20°F/-29°C. See
Technical Data Sheet TFP1241.
It is recommended that internally gal-
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
that separately indicates operation of
the detection system is recommended
and may be required by the authority
having jurisdiction. A dual setting low
pressure alarm switch, such as the
Potter Electric PS40-2A, is suitable for
the service. The recommended pres-
sure settings are as follows:
• Low pressure alarm setting at ap-
proximately 6 psi (0,4 bar) below the
minimum pilot line service pressure
requirement shown in Graph C.
• Fire alarm setting at approximately
15 psi (1,0 bar) below the minimum
pilot line service pressure require-
ment shown in Graph C.
The Pressure Relief Valve (Ref. Item
D6 - Fig. 6) 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.
Page 9 of 20
TFP1350
GRAPH C
2-1/2 INCH (DN65) MODEL DV-3 DELUGE VALVE
— DRY PILOT LINE PRESSURE REQUIREMENTS —
WATER S
PPLY PRESS
RE IN PSI
AIR PRESSURE IN PSI
20 17540 60 80 100 120 140 160
30
20
10
0
40
MINIMUM SYSTEM AIR PRESSURE
RANGE OF ACTUATOR OPENING PRESSURE
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