UV-PRC001-EN 21
Circuit Setter Manual Balancing Valve
Factory installed piping packages that include the circuit balancing valve
(OPTION C or D) feature incorporate a circuit balancing valve.
The circuit balancing valve is available in both 1/2-and 3/4-inch (nominal)
piping packages. This flow mechanism is a combination of service shut-
off, balancing, and flow measuring device. The flow measurement is
achieved by means of a fixed geometry venturi-style orifice. Two pres-
sure reading schrader ports are provided for system balancing. The
memory stop allows return of the stem/ball to its original set position af-
ter use as a servicing shut-off device. The balancing valve stem has
wrenching flats for normal setting. The valve stem is capable of opera-
tion by a 4:1 turn ratio for stem positioning. The balancing valve is de-
signed for use at 300 psi up to 250 F. See Figure 22 for circuit setter
balancing valve.
Note: The circuit setter is used as a return shut-off valve. It is not available
when selecting the 2-position isolation valve option.
Piping
Factory Installed Piping
Figure 22: Circuit setter
balancing valve
Water Pressure Drops in (feet) for Unit Vent 2-way and 3-way Piping Packages
Table 16: 1.8 Cv rated valves in 1/2" piping packages
Piping Pkg Cv Rating 2 GPM 3 GPM 4 GPM 5 GPM 6 GPM 7 GPM
A Basic Pkg 1.8 3.2 7.1 12.6 19.5 28.0 38.1
C w/ CBV 1.8 5.2 11.7 20.7 32.3 46.4 63.1
D w/ Strainer & CBV 1.8 5.5 12.4 22.0 34.2 49.2 66.8
Table 17: 4.6 Cv rated valves in 1/2" piping packages
Piping Pkg Cv Rating 5 GPM 6 GPM 7 GPM 8 GPM 9 GPM 10 GPM 11 GPM 12 GPM 13 GPM 14 GPM
A Basic Pkg 4.6 4.5 6.3 8.5 11.0 13.7 16.8 20.2 23.9 27.9 32.1
C w/ CBV 4.6 17.2 24.7 33.5 43.6 55.1 67.9 - - - -
D w/ Strainer & CBV 4.6 19.1 27.4 37.2 48.5 61.3 75.5 - - - -
Table 18: 7.3 Cv rated valves in 3/4" piping packages
Piping Pkg Cv Rating 9
GPM
10
GPM
11
GPM
12
GPM
13
GPM
14
GPM
15
GPM
16
GPM
17
GPM
18
GPM
19
GPM
20
GPM
A Basic Pkg 7.3 4.8 5.9 7.1 8.4 9.8 11.4 13.0 14.8 16.7 18.7 20.8 23.0
C w/ CBV 7.3 16.8 20.7 25.1 29.8 34.9 40.5 46.5 - - - - -
D w/ Strainer & CBV 7.3 21.2 26.2 31.7 37.7 44.2 51.2 58.8 - - - - -
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