Johnson Controls Tyco DV-5a Series Manual page 6

TFP1425
Page 6 of 34
SYSTEM PIPING WITH AUTOMATIC SPRINKLERS - NORMALLY DRY
AUTOMATIC
SUPERVISORY
AIR/NITROGEN
SUPPLY
8 TO 12 PSI
SUPERVISORY
LOW PRESSURE
ALARM SWITCH
CHAMBER SUPPLY
SYSTEM AIR
PRESSURE CONTROL VALVE
(NORMALLY OPEN)
GAUGE
SINGLE INTERLOCK PREACTION WET PILOT ACTUATION SCHEMATIC DIAGRAM
opens to constantly vent the DV-5
phragm Chamber to hydraulically latch
the DV-5 in the tripped position until
a
manually reset.
In standby mode, the integrity of the
system piping is supervised by a low
pressure alarm switch.
Refer to the following three sections for
additional information regarding actua-
tion options:
• Wet Pilot Actuation
• Dry Pilot Actuation
• Electric Actuation
WET PILOT SPRINKLER
DETECTION SYSTEM
(MINIMUM 1/2" PIPE AND
AUTOMATIC SPRINKLERS)
WATERFLOW
PRESSURE
DIAPHRAGM CHAMBER
PRESSURE GAUGE
RESTRICTION
MANUAL RESET
ACTUATOR
DIAPHRAGM
DIAPHRAGM CHAMBER
SUPPLY CONNECTION
Wet Pilot
Dia-
a
Actuation
The Wet Pilot Actuation Trim forms a
part of the laboratory approval of the
DV-5 Valves and is necessary for their
a
proper operation.
With reference to Figure 4, the Wet Pilot
Actuation Trim provides for connec-
tion of a detection system consisting
of wet pilot line sprinklers (heat detec-
tors) and Manual Control Stations inter-
connected with minimum 1/2 in. (DN15)
steel pipe. The pilot line is connected to
the Wet Pilot Line Connection.
Dimensions are provided in Figure 13.
Pilot sprinklers are to be minimum
5.6 K-factor (80 K-factor) orifice
approved automatic sprinklers. Manual
Control Stations are to be the Model
MC-1 described in Technical Data
Sheet TFP1382.
NOTE: For Single Interlock Preaction
Systems with Wet Pilot Actuation, the
system designer typically selects wet
DV-5A
VALVE
ALARM
SWITCH
DRAIN
WATER SUPPLY
PRESSURE
GAUGE
FIGURE 4
DV-5 VALVE
a
INSPECTOR'S
TEST CONNECTION
(AT MOST HYDRAULICALLY
DEMANDING LOCATION OF
WET PILOT LINE)
REMOTE
MANUAL
CONTROL
STATION
DRAIN
(WHEN
SPECIFIED)
SYSTEM DRAIN VALVE
(NORMALLY CLOSED)
MAIN
DRAIN VALVE
(NORMALLY
DRAIN
CLOSED)
LOCAL
MANUAL
DRAIN
CONTROL
STATION
MAIN
CONTROL VALVE
(NORMALLY
WATER
OPEN)
SUPPLY
pilot sprinklers that will operate sooner
than the automatic sprinklers chosen
for use on the sprinkler piping.
The maximum height of a wet pilot
line above the DV-5 Valve must not
a
exceed the limitations shown in Table
B as a function of the minimum water
supply pressure to the DV-5
an equivalent length (pipe plus fittings)
of the pilot line up to 500 ft (150 meters)
to the most remote pilot sprinkler.
Provision must be made for install-
ing a 5.6 K-factor (80 K-factor) orifice,
Inspector's Test Connection at the
most hydraulically demanding location
of a wet pilot line (usually adjacent to
the highest and most remote wet pilot
sprinkler or Manual Control Station).
NOTES: Wet Pilot Lines must be main-
tained at a minimum temperature of
40°F (4°C).
At a minimum, it is recommended that
internally galvanized pipe and fittings
be used for wet pilot lines.
DRAIN
DRAIN
Valve for
a