Data Sheet for Product

M3FB…LX… Series Modulating Control Valve Technical Instructions
for Hot Gas Control Document Number CA2N4721E-P25
December 4, 2019
Siemens Industry, Inc. Page 5
Mounting Notes
Mounting instructions are enclosed with the valve (Document Number 35548). Wiring
instructions are included with the ZM Terminal Housing Module (Document Number
35541).
The refrigerant valves can be mounted in any orientation, but upright mounting is
preferable.
Figure 2. Acceptable Mounting Positions.
Arrange the piping so that the valve is not located at a low point where oil could collect.
The pipes should be fitted so that the alignment does not distort the valve connections.
Support the valve body so that it cannot vibrate. Vibration can lead to burst piping
connections. Before soldering the pipes, ensure that the direction of flow through the
valve is correct.
Figure 3. Piping Alignment.
The pipes must be soldered with care. The flame should be large enough to ensure that
the junction heats up quickly and the valve does not get too hot. The flame should be
directed away from the valve. Cool the valve body with a wet cloth while soldering.
Port 2 must be sealed off when the valve is used in a straight-through application.
CAUTION:
Always switch off the power supply before connecting or disconnecting the
ZM... module.
Maintenance Notes
The M3FB…LX… valves are maintenance-free. The low friction and robust design
ensure long product life. The valve cannot be repaired; it must be replaced as a
complete unit.
Specifications
Electrical
Electrical interface Only allowed with low voltage
(Class 2)
Supply voltage 24 Vac for 0 to 10 Vdc and 4 to 20 mA
Maximum voltage tolerance +15/–10%
Frequency 50 to 60 Hz
Control signals
ZM101/A 0 to 10 Vdc or 0 to 20V phase cut
ZM121/A 4 to 20 mA or 0 to 20V phase cut
Input resistance
0 to 10 Vdc > 100K ohm
4 to 20 mA < 150 ohm
Connection terminals Screw terminals for 12 AWG wire