Typical Piping Arrangements; Heating - Hot Water End Of Cycle Valve Piping - Daikin AVV Installation And Maintenance 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 75° from the vertical.
For steam applications only, mount the modulating valve
actuator above the valve body at 45° 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 End of Cycle 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 78: Typical 2-Way End of Cycle Valve, Water Piping
Return
OCT Sensor
(2-pipe CW/HW Units Only)
Supply
Note: For Erie E.O.C. water valves, always have the
direction of water flow piped to the B-port of the valve.
IM 817-7
Balancing and Shutoff Valve
2-way EOC
Valve
Unit Coil
Return
A
B
Supply
Unions
Shutoff Valve
3-Way End of Cycle, Normally Open, Hot
Water or 2-pipe CW/HW Valve Piping
(typical)
The 3-way End of Cycle 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.
Return
Bypass
3-way EOC Valve
OCT Sensor
(2-pipe CW/HW Units Only)
Supply
3-way End of Cycle, Normally Closed,
Chilled Water Valve Piping (typical)
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.
Return
Balancing and Shutoff Valve
Balancing Valve
Bypass
3-way
EOC Valve
A
Supply
30
Balancing and Shutoff Valve
Union
Unit Coil
Return
Balancing
Valve
Supply
B A
AB
Union
Shutoff Valve
Union
Unit Coil
Return
Supply
B
Union
AB
Shutoff Valve
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