Siemens Building Technologies M3FK..LX.. Data Sheet
722
4
Modulating refrigerant
M3FK..LX..
valves with magnetic
actuator, PN 32
hermetically sealed, for condenser control
• Mixing or straight-through valves with magnetic actuator for modulating
capacity control of condensers.
• Short positioning time (approx. 1 s)
• High resolution
• High rangeability
• Hermetically sealed
• Versatile electrical interface
• Friction-free
• Port 1 -> 3 closed when de-energized
• Robust and maintenance-free
Use
CE2N4722en
08.06.2010
The M3FK..LX.. mixing or straight-through valves with magnetic actuator can be used
for modulating capacity control of condensers. They may be used for liquid or gas
control.
Suitable for safety refrigerants such as R22, R134a, R404A, R407C, R507, etc.
Building Technologies
Type summary
Accessories /
ZM.. terminal housing
Order
Type reference DN kvs Δp
Liquid Gas
[m3/h] [MPa] [bar] [VA] [W]
M3FK15LX06
M3FK15LX15
M3FK15LX
M3FK20LX
M3FK25LX
M3FK32LX
M3FK40LX
M3FK50LX
= Maximum permissible differential pressure across the valve’s control path 1 → 3 valid for the
Δp
max
entire actuating range
= Rated apparent power for transformer selection
S
NA
P
= Typical power consumption
med
k
= Nominal flow rate of cold water through the fully open valve (H
vs
100 kPa (1 bar), to VDI 2173
15 0.6 13 3
15 1.5 13 3
15 3.0 13 3
20 5.0 16 4
25 8.0 16 4
0.2 0.8
32 12.0 20 5
40 20.0 40 10
50 30.0
SNA P
max
40 10
) by a differential pressure of
100
med
Type reference Operating voltage Positioning signal Working range Data sheet
ZM101/A AC 24 V DC 0…10 V DC 4…8 V
ZM121/A AC 24 V DC 4…20 mA DC 8…16 mA
ZM111 DC 0…20 V Phs DC 10…15 V Phs
For the ZM101/A and ZM121/A types also the DC 0…20 V Phs positioning signal is possible without
operating voltage.
N4591
The M3FK..LX.. valve and the ZM.. or ZM../A terminal housing must be ordered
separately.
When placing an order, please specify the quantity, product description and type code.
Type reference Stock number Description
M3FK15LX M3FK15LX Refrigerant valve
ZM101/A ZM101/A Terminal housing
Delivery
Rev. no.
Valves and terminal housings are packed separately.
Overview table, see page 9.
Technical and mechanical design
The armature or magnetic core is designed as a floating component within the pressure
system, so that no external shaft gland is required. The leakage losses common with
moving parts are thus avoided. The valve cross-section allows for easy flow whether
the valve is fully or only partially open. This reduces pressure losses and ensures quiet
operation.
The valves are fitted with extended female solder unions, making pipe connection easy.
The control signal is converted in the ZM../A terminal housing into a phase cut signal,
which generates a magnetic field in the coil. This causes the only moving part, the
armature, to change its position in accordance with the interacting forces (magnetic
field, counter-spring, hydraulics etc.). The armature responds rapidly to any change in
signal, transferring the corresponding movement directly to the control disc, enabling
fast changes in load to be corrected quickly and accurately.
The force of the counter-spring closes the valve automatically (control path ports 1 -> 3)
if the power is switched off or fails.
2/10
Siemens Modulating refrigerant valves with magnetic actuator, PN 32 CE2N4722en
Building Technologies 08.06.2010
Sizing
Refrigeration capacity
Q
0
Selection table for
approximate guide to
valve size
Hot gas Liquid
R407C (R22) R134a (R12) R404A / R507 R407C (R22) R134a (R12) R404A R507
Condensation temperature tc [°C] Liquid temperature tfl [°C]
Valve type 30 40 50 30 40 50 30 40 50 30 40 30 40 30 40
M3FK15LX06 4.5 4.0 3.6 3.7 3.3 2.9 3.6 3.2 2.9 21 19 20 18 15 12
M3FK15LX15 11 10 8.9 9.2 8.2 7.2 8.9 8.0 7.2 54 49 51 45 37 31
M3FK15LX 22 20 18 18 16 14 18 16 14 107 97 102 91 74 62
M3FK20LX 37 33 30 31 27 24 30 27 24 179 162 170 151 124 103
M3FK25LX 59 53 48 49 44 38 47 43 38 286 259 272 242 199 165
M3FK32LX 89 80 72 74 66 57 71 64 58 429 389 408 364 298 248
M3FK40LX 149 134 119 123 109 96 119 107 96 715 648 681 606 497 413
M3FK50LX 223 201 179 184 164 143 178 160 144 1073 971 1021 909 745 619
Correct valve sizing (to ensure a sufficiently large pressure drop Δp
100 across the fully
v
open valve) is the key to the correct operation of a refrigeration unit. All the components
must be coordinated, and this can be ensured only by the refrigeration specialist.
The application examples on pages 5 and show the recommended pressure drop in
each case.
Pressure differential ∆p
in kW at an evaporation temperature t
= 0.5 bar across the fully-open valve. Nominal capacity Q0
V100
of 5 °C and a liquid temperature tfl of 30 °C.
o
Δp
= Differential pressure across the fully open valve (control path 1 → 3) by a volume flow
v100
V
100
3/10
Siemens Modulating refrigerant valves with magnetic actuator, PN 32 CE2N4722en
Building Technologies 08.06.2010
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