IM 830-6
36 www.DaikinApplied.com
The 3-way EOC Chilled Water 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 63: 3-way EOC, Normally Closed, Chilled Water Valve Piping
Union
3-way
EOC Valve
Shutoff Valve
Balancing & Shutoff Valve
Unit Coil
Return
Supply
Return
Supply
A
B
Union
AB
Balancing Valve
Bypass
Typical Water Coil Piping - EOC Valve Piping
Notes:
1.
All piping, fittings and unions by others (not Daikin) except as noted.
2.
Supply and return coil connection and stub-up unions by others
Figure 64:
Face and Bypass With 3-way End-of-Cycle Valve
Note:
Chilled water piping shown. Refer to coil connection arrange-
ment drawings to identify supply and return connections for other
hydronic coils.
Table 30: Descriptions for
1 Three-way End of Cycle 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 Unions (Provided by Others)
9 2-way End of Cycle valve (EOC)
10 Modulating control valve (Daikin)
11 Steam check valve and pressure equalizing line (Daikin)
12 Float and thermostatic steam trap (by Others)
Typical Steam – Modulating Valve Piping
The optional factory supplied Daikin MicroTech® 2-way
Modulating steam 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 steam flow in a
modulating fashion. Before proceeding, see
through
, as well as the job-specific piping drawings.
CAUTION
!
Refer to the arrow on the modulating valve body to determine the
direction of flow. If the valve is mounted improperly, the unit will not
operate properly and damage to the valve can result.
Install the valve so that there is a 2" (51mm) minimum
clearance to remove the actuator form the valve body. Provide
unions for removal of unit coil and/or control valve as a future
service consideration.
Steam connections may be same end as cooling coil
connections, but are recommended to be opposite end to
facilitate piping. When using MicroTech controls, they must be
opposite end. The modulating valve accessory must be field
installed on the unit for which it was selected.
Figure 65: Typical 2-Way Steam Modulating Valve Piping
Unit Coil
A
AB
Return
Supply
Unions
Shutoff Valve
Shutoff Valve
Equalizing Line
Return
Supply
Steam Trap