Data Sheet for Product

ManualsBrandsSiemens ManualsControl Valves7/8" 2-Port PS43 Modulating Refrigerant Valve with Magnetic Actuator (5 Cv)

Siemens Industry, Inc.

M3FB…LX… Series

Technical Instructions

Document No. CA2N4721E-P25

December 4, 2019

Modulating Control Valve

for Hot Gas Control

Description

Modulating control valves with magnetic actuator for hot gas applications for capacity

control of refrigeration units and for heat recovery systems.

Features

• Quick positioning time (less than 1 second).

• High stroke resolution (> 1:200) and control accuracy.

• Hermetically sealed.

• Versatile electrical interface.

• Port AB → A closed when de-energized.

• Heavy-duty and maintenance-free.

Application

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 organic safety refrigerants such as R22, R134a, R404A, R407C and R507.

Not suitable for flammable refrigerants or ammonia (R717).

Product Numbers

See Table 1.

Warning/Caution Notations

WARNING:

Personal injury or loss of life may occur if you do not perform

a procedure as specified.

CAUTION:

Equipment damage may occur if you do not follow a

procedure as specified.

Summary of content (9 pages)

PAGE 1
Technical Instructions Document No. CA2N4721E-P25 December 4, 2019 M3FB…LX… Series Modulating Control Valve for Hot Gas Control Description Modulating control valves with magnetic actuator for hot gas applications for capacity control of refrigeration units and for heat recovery systems. Features • Quick positioning time (less than 1 second). • High stroke resolution (> 1:200) and control accuracy. • Hermetically sealed. • Versatile electrical interface. • Port AB → A closed when de-energized.
PAGE 2
M3FB…LX… Series Modulating Control Valve for Hot Gas Control Technical Instructions Document Number CA2N4721E-P25 December 4, 2019 Ordering The valve body and magnetic actuator form one integral unit and cannot be separated. The M3FB...LX... valve and the 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. Valve Product Number (Without ZM...
PAGE 3
M3FB…LX… Series Modulating Control Valve for Hot Gas Control Sizing Technical Instructions Document Number CA2N4721E-P25 December 4, 2019 See Table 2. NOTE: Correct valve sizing (to ensure a sufficiently large pressure drop pv100 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.
PAGE 4
M3FB…LX… Series Modulating Control Valve for Hot Gas Control Technical Instructions Document Number CA2N4721E-P25 December 4, 2019 Key : to Evaporation temperature [°F] tc Condensation temperature [°F] tfl Liquid temp. ( tc – degree of sub-cooling) [°F] Qo m Cvs pv Refrigeration capacity [tons] Mass flow of refrigerant [lbs/h] Flow rate [ft3/h] Admissible pressure differential [psi] Figure 1. Selection Chart for Hot-Gas Applications. Page 4 Siemens Industry, Inc.
PAGE 5
M3FB…LX… Series Modulating Control Valve for Hot Gas Control Mounting Notes Technical Instructions Document Number CA2N4721E-P25 December 4, 2019 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.
PAGE 6
M3FB…LX… Series Modulating Control Valve for Hot Gas Control Technical Instructions Document Number CA2N4721E-P25 December 4, 2019 Permissible operating pressure pemax Maximum 623 psi (43 bar) Pressure differential pvmax AB → A See Table 1 AB → B 116 psi (8 bar) Leakage (at 14.5 psi [1 bar]) Temperature of medium Valve characteristic (stroke, kv) AB → A Max. 0.05% CV AB → B Max. 0.5% kCv Organic safety refrigerants (R22, R134a, R404a, R40TC, R410A, R507, and so on).
PAGE 7
M3FB…LX… Series Modulating Control Valve for Hot Gas Control Application Examples Three-way Hot-gas Bypass Control Technical Instructions Document Number CA2N4721E-P25 December 4, 2019 The diagrams shown here are examples only, without installation-specific details. • For accurate control of evaporators, from 0 to 100% refrigeration capacity. • Suitable for test rooms, laboratory systems, small chilled water units and DX evaporators with a refrigeration capacity of up to approximately 11.
PAGE 8
M3FB…LX… Series Modulating Control Valve for Hot Gas Control Technical Instructions Document Number CA2N4721E-P25 December 4, 2019 Application Examples, Continued Direct Hot-gas Bypass The control valve throttles the capacity of a compressor stage. The gas is fed to the suction side of the compressor and cooled by a re-injection valve. Capacity control ranges from 100% to approximately 10%.
PAGE 9
M3FB…LX… Series Modulating Control Valve for Hot Gas Control Technical Instructions Document Number CA2N4721E-P25 December 4, 2019 Dimensions Valve Product Number Line Size [mm] [in] øD [in] L [in] H1 [in] H2 [in] H3 [in] A [in] B [in] C [in] W [lb] M3FB15LX06/A 15 1/2 5/8 5.91 2.56 0.98 7.24 3.15 3.31 2.64 9.5 M3FB15LX15/A 15 1/2 5/8 5.91 2.56 0.98 7.24 3.15 3.31 2.64 9.5 M3FB15LX/A 15 1/2 5/8 5.91 2.56 0.98 7.24 3.15 3.31 2.64 9.5 M3FB20LX/A 20 3/4 7/8 6.