Siemens Building Technologies M3FB…LX… Series Technical Instructions
M3FB…LX… Series
Modulating Control Valve
for Hot Gas Control
Technical Instructions
Document No. CA2N4721E-P25
Rev. 1, February, 2000
Description
Features
Application
Product Numbers
Valves with magnetic actuator for modulating capacity control of refrigeration units and
for heat recovery.
•
Quick positioning time (approx. 1 second)
•
High resolution (> 1 : 200)
•
High rangeability
•
Hermetically sealed
•
Versatile electrical inter f ac e
•
Low friction
•
Port 1 → 3 closed when de-energized
•
Heavy-duty and maintenance-free
The M3FB...LX... three-way or straight-through valves with magnetic actuator are used
for modulating capacity control of refrigeration units and for heat recovery. They may be
used as hot gas diverting or straight-through valves.
Suitable for safety refrigerants suc h as R22, R13 4a, R40 4A, R40 7C and R507 .
See
Warning/Caution Notations
Table 1.
WARNING:
CAUTION:
Personal injury/loss of life may occur if a procedure is not
performed as specified.
Equipment damage may occur if the user does not follow a
procedure as specified.
Siemens Building Technologies, Inc.
Technical Instructions M3FB…LX… Series Modulating Control Valve
Document Number CA2N4721E-P25 for Hot Gas Control
Rev. 1, February, 2000
Ordering
The M3FB...LX... valve and the ZM... or ZM.../A module must be ordered separately.
When placing an order, specify the quantity, product number and product description.
Example :
1 M3FB15LX/A control valve and 1 ZM101/A module.
Table 1. Product Numbers.
N
Valve Product Number
(Without ZM...)
Line Size
[in]
1
Cv
→→→→
3
∆∆∆∆
1
max
p
v
3
→→→→
P
[VA]
P
[VA]
[gpm]
[psi] [bar]
M3FB15LX06/A
M3FB15LX15/A
M3FB15LX/A
M3FB20LX/A
M3FB25LX/A
M3FB32LX
1/2 0.7 319 22 26 6
1/2 1.8 319 22 26 6
1/2 3.5 319 22 26 6
3/4 5.9 261 18 26 6
1 9.4 174 12 40 10
1-1/4 14.0 116 8 40 10
Key :
max
∆
p
= Max. admissible pressure differential
v
N
P
P
= Nominal power
med
= Mean operating power
Cv = Flow rate tolerance ±10 %
med
Technical Design
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. Therefore, leakage losses common
with moving parts are 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 connections
easy.
The control signal is converted in the ZM.../A module 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, counterspring, 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 valve is normally closed. A spring closes the valve automatically if the power is
switched off or fails.
Page 2
Siemens Building Technologies, Inc.
M3FB…LX… Series Modulating Control Valve Technical Instructions
for Hot Gas Control Document Number CA2N4721E-P25
Rev. 1, February, 2000
Sizing
Table 2
See
NOTE:
.
Correct valve sizing (to ensure a sufficiently large pressure drop ∆p
100
v
across
the fully 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 that follow show the recommended pressure drop
in each case.
Refrigeration capacity in tons
Nominal capacity in tons at evaporation temperature t
c
= 41°F (5 °C)
Table 2. Selection Table for Hot-Gas Applications.
(Approximate Guide to Valve Size)
Refrigerant
R407C (R22) R134a (R12) R404A / R507
Condensation temperature tc [°F]
v100
p
∆∆∆∆
Valve Product
122 104 86 122 104 86 122 104 86
Number
0.5 bar M3FB15LX06/A 1.3 1.1 1.0 1.1 0.9 0.8 1.1 0.9 0.8
(7.2 psi) M3FB15LX15/A 3.1 2.8 2.5 2.7 2.4 2.1 2.6 2.3 2.1
M3FB15LX/A 6.3 5.7 5.1 5.4 4.8 4.0 5.1 4.6 4.0
M3FB20LX/A 10.5 9.4 8.5 9.1 8.0 6.8 8.8 7.7 6.8
M3FB25LX/A 16.8 15.1 13.7 14.5 12.5 10.8 13.9 12.2 10.8
M3FB32LX 25.3 22.8 20.5 21.6 19.1 16.2 21.1 18.5 16.5
1.0 bar M3FB15LX06/A 1.8 1.6 1.4 1.5 1.3 1.1 1.5 1.3 1.1
(14.5 psi) M3FB15LX15/A 4.6 4.0 3.4 3.7 3.1 2.8 6.5 3.1 2.8
M3FB15LX/A 8.8 8.0 7.1 7.4 6.5 5.7 7.4 6.5 5.7
M3FB20LX/A 14.8 13.1 11.7 12.5 10.8 9.4 12.2 10.8 9.4
M3FB25LX/A 23.6 21.1 18.8 19.9 17.4 14.8 19.6 17.4 15.1
M3FB32LX 35.6 31.6 28.2 30.2 26.2 22.2 29.3 25.9 22.8
4.0 bar M3FB15LX06/A 3.2 2.8 2.4 2.6 2.1 1.7 2.7 2.4 2.0
(58 psi) M3FB15LX15/A 8.0 7.1 6.0 6.5 5.4 4.3 6.8 6.0 5.1
M3FB15LX/A 16.2 14.2 12.0 13.1 10.8 8.3 13.7 11.7 10.0
M3FB20LX/A 27.0 23.6 19.9 21.6 17.9 13.7 22.8 19.6 16.5
6.0 bar M3FB15LX06/A 3.7 3.1 2.5 2.8 2.2 1.7 3.1 2.7 2.2
(87 psi) M3FB15LX15/A 9.4 8.0 6.3 7.1 5.4 4.3 8.0 6.5 5.4
M3FB15LX/A 18.5 15.7 12.8 14.2 10.8 8.3 15.7 13.4 11.1
M3FB20LX/A 30.7 26.2 21.1 23.6 17.9 13.7 26.2 22.2 18.2
8.0 bar M3FB15LX06/A 4.0 3.1 2.5 2.8 2.2 N/A 3.4 2.8 2.2
(116 psi) M3FB15LX15/A 10.0 8.0 6.3 6.8 5.4 NA 8.5 7.1 5.4
M3FB15LX/A 19.6 15.9 12.8 13.9 10.8 N/A 17.1 13.9 11.1
M3FB20LX/A 32.7 26.8 21.1 23.1 17.9 N/A 28.5 23.3 18.2
100
∆
p
= Pressure drop across the fully open valve
v
Siemens Building Technologies, Inc.
Page 3
Loading...