Typical Water Coil Piping-Eoc Valve Piping; Steam-Typical Modulating Valve Piping - Daikin AVS Installation Manual

Typical Piping Arrangements
Table 20 - Descriptions
Three-way End of Cycle control valve (
1
Coil air vent (Daikin)
2
Coil drain (Daikin)
3
4 Shutoff valve (Others)
Balancing shutoff valve(s) (Others)
5
6
Supply
7
Return
8 Unions (Others)—Must disconnect below floor line
Two-way, End of Cycle two-position valve (Daikin)
9
10 Union: Half attached to coil, half attached to valve
Modulating control valve (Daikin)
11
All piping, fittings and unions by others (not Daikin) except as noted
12
Steam check valve and pressure equalizing line (Daikin)
13
14
Float and thermostatic steam trap (Others)
Supply and return coil connection and stub-up unions by others
15
Typical Water Coil Piping - EOC Valve Piping
Figure 70 - Face and Bypass With 3-way End-of-Cycle Valve
(Piping Within Unit End Compartment)
8
4
6
7
S5 Sensor
Figure 71 - Face and Bypass With 3-way End-of-Cycle Valve
(Piping Outside Unit End Compartment)
15
15
4
5
6
7
S5 Sensor
IM 817-4
)
Daikin
1
2
15
3
5
1
2
15
3
Steam – Typical Modulating Valve Piping
The optional factory supplied Daikin MicroTech II™
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.
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 may result.
The valve should be installed 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 II controls, they must be opposite end. The modulating
valve accessory must be field installed on the unit for which it was
selected.
Figure 72 - Typical 2-Way Steam Modulating Valve Piping
Supply
Shutoff Valve
Steam Trap
Equalizing Line
Shutoff Valve
Return
Figure 73 - Same End Connections – Model AV 68/69 Coils
Vacuum Breaker
(by Daikin)
Steam Trap (by Others)
1⁄4" Flare by 1⁄2" MPT
Half-Union and 1⁄4" Flare
(by Daikin)
Tee (by Others)
Union
Unit Coil
Supply
Return
Control Valve: Install On
Center Coil Connection
Vacuum Breaker Tube
(by Daikin)
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