IM 830-6
38 www.DaikinApplied.com
2-Way Modulating, Normally Open, Hot
Water or 2-pipe CW/HW – Typical
The 2-way Modulating hot water (or 2-pipe CW/HW) valve is
furnished normally open to the coil. When the valve is de-
energized (off) there is full flow through the coil. Energizing the
valve reduces the volume of water flow in a modulating fashion.
Figure 68: 2-Way Modulating Valve Control, Normally Open, Hot
Water or 2-pipe Chilled Water/Hot Water Piping
Unit Coil
A
AB
2-Way
Modulating
Valve
Return
Supply
Unions
Balancing and Shutoff Valve
Shutoff Valve
Supply
Return
OCT Sensor
(2-pipe CW/HW
Units Only)
Note:
Actuator to be configured for
A
port to be normally open.
3-Way Modulating, Normally Open, Hot
Water or 2-pipe CW/HW – Typical
The 3-way Modulating hot water (or 2-pipe CW/HW) valve is
furnished normally open to the coil. When the valve is de-
energized (off) there is full flow through the coil. Energizing the
valve allows a varying amount of water to bypass the coil.
Figure 69: 3-Way Modulating Valve Control
Unit Coil
A
AB
3-Way
Modulating
Valve
Return
Supply
Union
Balancing and Shutoff Valve
Shutoff Valve
Supply
Return
B
Union
Balancing Valve
OCT Sensor
(2-pipe CW/HW
Units Only)
Note:
The
A
port is always piped to the coil. Actuator to be configured
for
A
port to be Normally Open.
Figure 70: 3-Way Modulating Valve Control (Hot Water Coil Shown)
Table 33: Descriptions for
1 Three-way modulating control valve (Daikin)
2 Coil (Auto) air vent (Daikin)
3 Coil drain (Daikin)
4 Shutoff valves (Provided by Others)
5 Balancing shutoff valve(s) (by Others)
6 Supply-coil connection and stub-up union
7 Return-coil connection and stub-up union
8 Flexible hoses swivel connections (Provided by Others)