Daikin AVS - Cooling Modulating Valve Piping

Page 28 of 60 IM 817-4
Cooling – Chilled Water Modulating
Valve Piping
2-way Modulating, Normally Closed, Chilled
Water Valve Piping (typical)
The 2-way Modulating chilled water valve is furnished normally
closedtothecoil.Whenthevalveisde-energized(off)thereisnoow
throughthecoil.Energizingthevalveallowsowthroughthecoilin
a modulating fashion.
3-Way Modulating, Normally Closed, Chilled
Water Valve Piping (typical)
The 3-way Modulating chilled water valve is furnished normally closed
tothecoil.Whenthevalveisde-energized(off)theowbypassesthe
coil.Energizingthevalveallowsowthroughthecoilinamodulating
fashion.
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
2-way Modu-
lating
Valve
Unit Coil
Unions
Return
Shutoff Valve
Supply
Supply
3-way
Modulating
Valve
Union
Balancing Valve
N.C.
N.O.
Return
Unit Coil
Union
Common
Balancing and Shutoff Valve
Figure 84 - 3-way Modulating Valve Control
(Piping Within Unit End Compartment)
11
2
3
4
5
6
7
8
15
S5 Sensor
Refer to the arrows 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.
Figure 82 - 2-way Modulating, Normally Closed Chilled Water Valve
Piping
(Piping Outside Unit End Compartment)
See page 25 for number designation descriptions.
Figure 81 - 2-way Modulating Valve Control, Normally Closed, Chilled
Water Piping
Figure 83 - 3-way Modulating Valve Control, Normally Closed, Chilled
Water Piping
15
3
15
15
4
5
6
7
2
11
S5 Sensor
See page 25 for number designation descriptions.
CAUTION