TFP1416
Page 7 of 18
NOTES:
The dew point of the pilot line air pressure 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, introduction of moisture into the pilot lines
exposed to freezing temperatures can create an ice buildup
that could prevent 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 the
required value.
It is recommended that an AMD-3 Nitrogen Maintenance
Device be utilized in dry pilot actuation system applica-
tions where the dew point must be maintained below -20°F
(-29°C). Refer to Technical Data Sheet TFP1241.
• 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
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 recommended
thatinternally galvanized pipe and castiron
fittings be used for dry pilot lines.
Installation
The TYCO DV-5ASingle Interlock Pre-
action Dry Pilot Actuation Valve is to
be installed in accordance with this
section.
NOTICE
DV-5AAutomatic Water Control Valves
are designed to be used in freshwa-
ter systems. When the supply is from
an alternative source such as brackish
water, saltwater, or contains additives
such as foam, the limited warranty is
reduced to one year from the time of
installation. An increase in frequency of
inspections is required when the valve
is exposed to such supplies and other
corrosive conditions or chemicals that
could impact valve materials or the
operation of the assembly. The system
and all components must be designed
accordingly for the increased demand.
It is required to thoroughly flush the
valve and trim assembly with freshwa-
ter and reset to the set condition after
each operation.
Proper operation of the DV-5Asingle
interlock preaction dry pilot actua-
tion valve depends upon their trim
being installed in accordance with the
instructions given in this technical data
sheet. Failure to follow the appropriate
trim diagram may prevent the DV-5A
valve from functioning properly, as well
as void approvals and the manufactur-
er’s warranties.
The DV-5Avalve must be installed in a
readily visible and accessible location.
The DV-5Avalve, associated trim, and
wet pilot lines must be maintained at
a minimum temperature of 40°F (4°C).
Heat tracing of the DV-5Avalve or its
associated trim is not permitted. Heat
tracing can result in the formation of
hardened mineral deposits that are
capable of preventing proper operation.
Always open the system control valves
slowly to avoid a sudden rush of water
entering the system.
The DV-5Avalve is to be installed in
accordance with the following criteria:
Step 1. All nipples, fittings, and devices
must be clean and free of scale and
burrs before installation. Use pipe
thread sealant sparingly on male pipe
threads only.
Step 2. The DV-5Asingle interlock pre-
action dry pilot actuation valve must be
trimmed in accordance with the trim
illustrations shown in Figure 5.
Note:If the addition of an alarm control
valve is desired or required by the local
AHJ, the alarm control valve noted as
Item H in Figure 8 is to be a separately
orderedelectronicallysupervised normally
open valve.
Step 3. Care must be taken to ensure
that check valves, strainers, globe
valves, etc. are installed with the flow
arrows in the proper direction.
Step 4. Drain tubing to the drip funnel
must be installed with smooth bends
that will not restrict flow.
Step 5. The main drain and drip funnel
drain may be interconnected provided
a check valve is located at least 12 in.
(300 mm) below the drip funnel.
Step 6. Suitable provision must be
made for disposal of drain water. Drain-
age water must be directed such that
it will not cause accidental damage to
property or danger to persons.
WATER SUPPLY PRESSURE IN PSI
100
RANGE OF ACTUATOR OPENING PRESSURE
MINIMUM SYSTEM AIR PRESSURE
20 60
15
0
30
140 180
200
GRAPH B
DV-5AVALVE SINGLE INTERLOCK PREACTION SYSTEM
DRY PILOT LINE AIR PRESSURE REQUIREMENTS
