Product Overview
MXG461…U, MXF461…U Modulating Control Valves Technical Instructions
With Magnetic Actuators Document Number CA1N4455E-P25
May 8, 2009
Siemens Building Technologies, Inc. Page 3
Manual Control
The valve control path (ports A → AB) can be opened
mechanically up to 95% of the full stroke by pressing the
handwheel inward and turning it clockwise (to the
MANUAL position). This disables the control signal from
the controller.
To disable automatic control of the valve, press the
handwheel inward and turn it counterclockwise (to the
OFF position). The valve will close.
For automatic control, the handwheel must be set to the
AUTO position (the handwheel will spring out).
OFF
AUTO
MANUAL
Sval0006R1
Figure 3. Selecting
Automatic Control.
Sizing
Table 1. MX.461…U - Valves Sizing.
Maximum Wire Gauge
Line
Size
Close-off
Product Numbers
C
V
Δ P
max
Pressure
S
NA
1
P
med
1
I
N
1
18 16 14 12
(in) (gpm) (psi) (bar) (psi) (VA) (W) (A) Cable Length L (ft)
MXG461.15-0.6U 1/2 0.7 44 3 44 29 5 3.15 108 213 361 525
MXG461.15-1.5U 1/2 1.7 44 3 44 29 5 3.15 108 213 361 525
MXG461.15-3.0U 1/2 3.5 44 3 44 29 5 3.15 108 213 361 525
MXG461.20-5.0U 3/4 5.8 44 3 44 29 5 3.15 108 213 361 525
MXG461.25-8.0U 1 9.3 44 3 44 29 5 3.15 108 213 361 525
MXG461.32-12U 1-1/4 14.0 44 3 44 29 5 3.15 108 213 361 525
MXG461.40-20U 1-1/2 23.0 44 3 44 44 6 4.00 66 118 197 328
MXG461.50-30U 2 35.0 44 3 44 44 6 4.00 66 118 197 328
MXF461.65-50U 2-1/2 58.0 44 3 44 46 6 5.00 49 98 164 262
Key:
ΔPmax = Maximum permissible differential pressure across the valve’s control path,
valid for the entire actuating range of the motorized valve.
S
NA = Nominal apparent power for selecting transformer
P
med = Typical power consumption
I
N = Required slow fuse
C
V
= Flow rate to IEC534-2-4
Control path A → AB (normally closed): Tolerance ±5%
Control path B → AB (normally open): Tolerance ±10%
L = Maximum cable length. With four-wire connections, the maximum
permissible length of the separate 16 AWG Cu (copper) signal cable is
656 feet. With three-wire connections, the maximum permissible cable
length is reduced to 1/3 of the values shown in the table.
1 = All data relates to a 24 Vac supply.