www.DaikinApplied.com 35
IM 830-6
Typical Piping Arrangements
Mount heating valve actuators in an upright position above
the center line of the valve body and pipe actuators normally
open to the coil. Modulating valve actuators for hot water
applications may be positioned above the valve body
a maximum of 75 degrees from the vertical. For steam
applications only, mount the modulating valve actuator above
the valve body at 45 degrees 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 85° 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. Install control valves so that there is a
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 Chilled Water/Hot Water
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 60: 2-way EOC, Normally Open, Hot Water or 2-pipe Chilled
Water/Hot Water Valve Piping
Unions
2-way
EOC Valve
OCT Sensor
(2-pipe CW/HW Units Only)
Balancing & Shutoff Valve
Unit Coil
Return
Supply
Return
Supply
A
B
Shutoff Valve
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 61: 3-way EOC, Normally Open, Hot Water or 2-pipe
Chilled Water/Hot Water Valve Piping
Union
Union
3-way
EOC Valve
Shutoff Valve
(Bypass)
Balancing &
Shutoff Valve
Unit Coil
Return
Supply
Return
Supply
OCT Sensor
2-pipe CW/HW Units Only)
Balancing Valve
A
AB
B
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 62: 2-way EOC, Normally Closed, Chilled Water Valve Piping
Unions
2-way
EOC Valve
Shutoff Valve
Balancing & Shutoff Valve
Unit Coil
Return
Supply
Return
Supply
A
B