Dwyer RDCV - Manual (Page 3)

Wiring Connections
(For DCV units)
Wire in accordance with the National Electrical Code and local regula-
tions. To aid in wiring the solenoid on the DCV may be rotated 360°. It is
recommended to use 18 AWG copper wire rated at 90°C or greater.
Wiring the DCV with DIN connector. See Figure 1.
1. Remove center screw and pull wiring assembly from the body.
2. Remove gasket and place small screwdriver in slot to pry out the ter-
minal block from the cover.
3. Thread wire through the gland nut, gland gasket, washer and connec-
tor cover.
4. Connect wires to proper terminals on the terminal block.
5. Snap terminal block back into the cover. The connector cover may be
rotated in 90° increments to position the cable entry as needed for the ap-
plication. Reinstall the center screw and screw back into the solenoid
body.
MAINTENANCE
Warning: To prevent the possibility of death, serious injury or property
damage, turn off electrical power, depressurize system and unit, and vent
fluid to a safe area before servicing.
The DCV/RDCV should be cleaned periodically. The amount of time be-
tween cleanings depends on the application. Preventive Maintenance in-
cludes keeping media clean of material and oil free, and periodic testing
to ensure proper operation and to look for wear or damage. Replacement
diaphragm assemblies are available from the factory.
OPERATION
Series DCV includes an integral solenoid and Series RDCV needs to be
used with a remote pilot solenoid valve. Both are normally closed valves.
When the remote pilot solenoid valve or integral solenoid opens, pres-
sure is released (exhausted) from the top of the diaphragm in the pulse
valve. This allows the line pressure on the bottom of the diaphragm to
push the diaphragm up and open the main orifice of the pulse valve.
When the solenoid then closes the pressure on the bottom and the top
of the diaphragm equalize closing the main orifice of the pulse valve.
INSTALLATION
Warning: Before installation make sure all air pressure has
been released, electric power has been turned off, and air pres-
sure source has been closed. Turn power on and increase pres-
sure only after installation is complete.
LOCATION
Select a location that will not exceed the ambient temperature specifica-
tions of the valve. The system must be located in an enclosure that
meets relevant safety standards and electrical codes of the environment.
MOUNTING
The DCV/RDCV can be mounted in any position. For optimum life and
performance it is recommended that the unit be mounted vertically and
upright to reduce the chance of foreign matter accumulating in the valve.
For DCV in weatherproof applications it is recommended that the cable
gland be positioned face down to avoid possible rainfall or water from
entry.
PROCESS CONNECTIONS
For DCV/RDCV with coupling connections:
1. Connect piping so that pneumatic input is the bottom connection and
the outlet is the side connection at 90°.
2. Stub pipe (blow tube) must be free of burrs, rust, oil, and other debris.
3. Disassemble compression fittings and place the retaining nut, retain-
er, and gasket onto the piping. Make sure that the beveled edge of the
gasket faces the valve body.
4. Connect fittings to the valve body. Make sure that the pipe is inline with
the valve ports. Nut and seals are for connection only and should not be
used for support purposes.
Notes:
• Make sure pipes are anchored securely to avoid separation from the
valve.
• Do not use the valve for leverage when connecting piping.
• Do not over-tighten retaining nut or valve damage may result. Tighten
retaining nuts just sufficiently for sealing to prevent leakage. This is a
gasket seal and does not require excessive turning of the nut.
For DCV/RDCV with NPT connections:
1. Connect piping so that pneumatic input is the bottom connection and
the outlet is the side connection at 90°.
2. Stub pipe (blow tube) must be free of burrs, rust, oil, and other debris.
3. Thread piping into the valve body. Make sure that the pipe is inline with
the valve ports. If using tape or pipe compound, apply to the male piping
threads and use sparingly as it may come loose and affect valve opera-
tion. Do not apply tape or pipe compound directly to the female valve
body threads.
Notes:
• Make sure pipes are anchored securely.
• Do not use the valve for leverage when connecting piping.
Pressure Connection from Remote Pilot Solenoid Valve
(For RDCV units)
The RSV, remote pilot solenoid valve, should be mounted as close as
possible to the RDCV pulse valve. The maximum distance is 9.8 ft (3 m).
Tubing from the remote solenoid valve is connected to the exhaust port
on the top of the RDCV pulse valve. If using tape or pipe compound,
apply to the male piping threads and use sparingly as it may come loose
and affect valve operation. Do not apply tape or pipe compound directly
to the female valve body threads.
Figure 1
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