Typical Piping Arrangements; Heating - Hot Water End Of Cycle Valve Piping; Cooling - Chilled Water End Of Cycle Valve Piping - Daikin AVS Installation Manual

Typical Piping Arrangements

Heating valve actuators should be mounted in an upright position above
the centerline of the valve body and should be piped normally open to
the coil. Modulating valve actuators for hot water applications may be
positioned above the valve body a maximum of 75º from the vertical.
For steam applications only, mount the modulating valve actuator above
the valve body at 45º from the vertical. Two-position, end-of-cycle
(EOC) valves used with face and bypass damper controlled units may
be positioned above the valve body a maximum of 85º from the vertical.
All control valves are shipped loose to help avoid shipping damage
to the piping or the coil connection stub from the weight of the valve,
and to provide the installing contractor with maximum flexibility in
making the field piping connections. Refer to Daikin factory instruction
sheet shipped with the unit for port orientation and a piping schematic.
Control valves must be installed on the units in which they are shipped.
Indiscriminate mixing of valves among units can result in valves not
properly sized for the desired flow rate. Control valves should be
installed so that there is 2" minimum clearance to remove the actuator
from the valve body. As a future service consideration, provide unions
for removal of the unit coil and/or the control valve.
Heating – Hot Water End of Cycle Valve Piping
The 2-way EOC 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 shuts off the water flow.
Figure 66 - 2-way EOC, Normally Open, Hot Water or 2-pipe CW/HW
Valve Piping
Return
Balancing and Shutoff Valve
2-way EOC
S5 Sensor
(2-pipe CW/HW Units Only)
Supply
The 3-way 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 the water to bypass the
coil.
Figure 67 - 3-way EOC, Normally Open, Hot Water or 2-pipe CW/HW
Valve Piping
Return
Bypass
3-way EOC Valve
S5 Sensor
(2-pipe CW/HW Units Only)
Supply
Page 24 of 60
Valve
Unit Coil
Return
A
B
Supply
Unions
Shutoff Valve
Balancing and Shutoff Valve
Union
Unit Coil
Return
Balancing
Valve
Supply
B A
AB
Union
Shutoff Valve
Cooling – Chilled Water EOC Valve Piping
The 2-way EOC CW valve is furnished normally closed to the coil.
When the valve is de-energized (off) there is no flow through the coil.
Energizing the valve allows flow through the coil.
Figure 68 - 2-way EOC, Normally Closed, Chilled Water Valve Piping
Return
Balancing and Shutoff Valve
2-way EOC
A
Shutoff Valve
Supply
The 3-way EOC CW valve is furnished normally closed to the coil. When
the valve is de-energized (off) the flow bypasses the coil. Energizing
the valve allows flow through the coil.
Figure 69 - 3-way EOC, Normally Closed, Chilled Water Valve Piping
Return
Balancing and Shutoff Valve
Balancing Valve
Bypass
3-way
EOC Valve
A
Supply
For 2-pipe systems use 3-way End of Cycle Valve (EOC) so supply
water is running through the circuit. The S5 sensor should be mounted
on the supply water pipe.
Valve
Unit Coil
Return
B
Supply
Unions
Union
Unit Coil
Return
Supply
B
Union
AB
Shutoff Valve
IM 817-4