Daikin AVV - Typical Steam Coil Piping

www.DaikinApplied.com 33 IM 817-7
For steam applications, the 2-way, angle pattern valve
furnished is normally piped open to the coil. All steam
coils are 1-1/8" (34mm) female sweat connections. Coil
connections terminate 9" (229mm) from the end of the unit.
Steam coils have a factory-installed pressure equalizing
valve and a 24" (610mm) long pressure equalizing line
that terminates in a 1/2" M.P.T. tting.
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.
See Figure 83 through Figure 87 on page 33.
Connect the 1/4" (6.35mm) vacuum breaker tube to
the downstream return line. Make this connection
downstream of the trap outlet.
Figure 85: Opposite End Drain Connection – (78/79 Coils)
Left End View Right End View
Note: Left Hand Steam Supply and Right Hand Steam Return (Shown)
Typical Steam Coil Piping
Figure 86: Face and Bypass With 2-Way End-of-Cycle
Valve - Same End Drain Connection (Piping Within Unit
End Compartment)
14
13
4
6
7
8
15
9
Figure 87: Face and Bypass With 2-Way End-of-Cycle
Valve - Same End Drain Connection (Piping Outside Unit
End Compartment)
13
14
4
6
7
15
9
15
15
Table 30: Number Descriptions for Figure 86 & Figure 87
1 Three-way End of Cycle control valve (Daikin)
2 Coil air vent (Daikin)
3 Coil drain (Daikin)
4 Shutoff valve (by others)
5 Balancing shutoff valve(s) (by others)
6 Supply
7 Return
8 Unions (by others), must disconnect below oor line
9 Two-way, End of Cycle two-position valve (Daikin)
10 Union: Half attached to coil, half attached to valve
11 Modulating control valve (Daikin)
12 All piping, ttings and unions by others (not Daikin
except as noted)
13 Steam check valve and pressure equalizing line (Daikin)
14 Float and thermostatic steam trap (by others)
15 Supply and return coil connection and stub-up unions
(by others)