Daikin AVV - Steam - Typical Modulating Valve Piping

IM 817-7 32 www.DaikinApplied.com
Steam – Typical Modulating Valve
Piping
The optional factory supplied Daikin controls with a
2-way Modulating steam valve is furnished normally
open to the coil. When the valve is de-energized (off)
there is full ow through the coil. Energizing the valve
reduces the steam ow in a modulating fashion
CAUTION
Refer to the arrow on the modulating valve body to determine the
direction of ow. If the valve is mounted improperly, the unit will
not operate properly and damage to the valve may result.
The valve should be installed so that there is a 2"
(51mm) minimum clearance to remove the actuator form
the valve body. Provide unions for removal of unit coil
and/or control valve as a future service consideration.
Steam connections may be same end as cooling coil
connections, but are recommended to be opposite end
to facilitate piping. When using Daikin factory controls,
they must be opposite end. The modulating valve
accessory must be eld installed on the unit for which it
was selected.
Figure 82: Typical 2-Way Steam Modulating Valve Piping
Unit Coil
A
AB
Return
Supply
Unions
Shutoff Valve
Shutoff Valve
Equalizing Line
Return
Supply
Steam Trap
Figure 83: Same End Connections – Model AV 68/69 Coils
Figure 84: 2-Way Steam Modulating Valve Control - Same
End Drain Connection (Piping Within Unit End
Compartment)
In Steam Systems:
The optional factory-supplied Daikin controls Modulating
Control Valve for steam applications is the 2-way type. It
is shipped separately from the unit ventilator to help avoid
shipping damage, yet provide the installer with maximum
exibility in making the eld piping connection. Before
proceeding, see Figure 82 through Figure 87 on page
33, as well as the job-specic piping drawings.