Johnson Controls Tyco DV-5a Series Manual page 7

SYSTEM PIPING WITH AUTOMATIC SPRINKLERS - NORMALLY DRY
LOW
PRESSURE
ALARM
DRY PILOT
SWITCH
ACTUATOR
DRAIN
AUTOMATIC
AUTOMATIC
SUPERVISORY
AIR/NITROGEN
AIR/NITROGEN
MAINTENANCE
DEVICE
8 TO 12 PSI
SUPERVISORY
LOW PRESSURE
ALARM SWITCH
CHAMBER SUPPLY
SYSTEM AIR
PRESSURE
(NORMALLY OPEN)
GAUGE
DV-5 VALVE - SINGLE INTERLOCK PREACTION DRY PILOT ACTUATION SCHEMATIC DIAGRAM
a
Dry Pilot
Actuation
The Dry 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 5, the Dry Pilot
Actuation Trim provides for installation
of a detection system consisting of pilot
sprinklers (heat detectors) and Manual
Control Stations interconnected with
a minimum length of 56 ft (17,1 m) of
1/2 in. (DN15) steel pipe equivalent to
207 in. (3400 cm ). The dry pilot line,
3 3
which is to be pressurized with air or
nitrogen, is connected to the Dry Pilot
Line Connection.
Dimensions are provided in Figure 14.
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 Dry Pilot Actuation, the
system designer typically selects dry
pilot sprinklers that will operate sooner
than the automatic sprinklers chosen
for use on the sprinkler piping.
DRY PILOT SPRINKLER
DETECTION SYSTEM
(MINIMUM 1/2" PIPE AND
AUTOMATIC SPRINKLERS)
SUPPLY
DIAPHRAGM CHAMBER
PRESSURE GAUGE
RESTRICTION
MANUAL RESET
DIAPHRAGM
CONTROL VALVE
DIAPHRAGM CHAMBER
SUPPLY CONNECTION
Provision must be made for installing
a 5.6 K-factor (80 K-factor) Inspector's
Test Connection at the most remote
location on the dry pilot line.
The Dry Pilot Actuation Trim is pro-
vided with a Model DP-1 Dry Pilot
Actuator, which is described in Tech-
nical Data Sheet TFP1380. The Actua-
tor is rated for use at a maximum pilot
service pressure of 50 psi (3,4 bar) and
a maximum water supply service pres-
sure of 250 psi (17,2 bar).
Graph B 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 AMD-1 Air Maintenance
Device (pressure reducing type), refer
to Technical Data Sheet TFP1221
• Model AMD-2 Air Maintenance
Device (compressor control type),
refer to Technical Data Sheet
TFP1231
• Model AMD-3 Nitrogen Maintenance
Device (high pressure reducing
type), refer to Technical Data Sheet
TFP1241
WATERFLOW
DV-5A
PRESSURE
VALVE
ALARM
SWITCH
DRAIN
WATER SUPPLY
PRESSURE
ACTUATOR
GAUGE
FIGURE 5
Page 7 of 34
INSPECTOR'S
TEST CONNECTION
(AT MOST REMOTE
LOCATION FROM
DV-5A VALVE)
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
Supervision of the pressure in the dry
pilot actuation system and an alarm
that separately indicates operation of
the detection system is provided by
a Low Pressure Alarm Switch set as
follows:
• Low pressure alarm setting at
approximately 6 psi (0,4 bar) below
the minimum pilot line service pres-
sure requirement shown in Graph B
• Fire alarm setting at approximately
15 psi (1,0 bar) below the minimum
pilot line service pressure require-
ment shown in Graph B
The Dry Pilot Air Pressure Relief Valve
provided in the trim 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.
The dry pilot line is to be provided with
low point drains to enable draining of
condensate.
Note: At a minimum, it is recom-
mended that internally galvanized pipe
and cast iron fittings be used for dry
pilot lines.
TFP1425
DRAIN
DRAIN