4 714 ACVATIXTM Modulating refrigerant valves with magnetic actuator, PS45 MVL661..-.. Hermetically sealed, for safety refrigerants • • • • • • • • • One valve type for expansion, hot-gas and suction throttle applications Hermetically sealed towards outside Selectable standard interface DC 0/2...10 V or DC 0/4...
Type summary Type reference DN MVL661.15-0.4 15 MVL661.15-1.0 15 MVL661.20-2.5 MVL661.25-6.3 MVL661.32-10 MVL661.32-12 1) 20 25 32 32 kvs [m3/h] kvs reduced 1) [m3/h] ∆pmax [MPa] 0.40 0.25 1.0 0.63 2.5 2.5 1.6 6.3 4 10 1.6 6.3 12 0.2 8 Q0 E [kW] Q0 H [kW] Q0 D [kW] 38 11 1.6 24 6.9 1.0 96 27 4.1 61 17 2.6 242 69 10 155 44 6.6 610 176 26 387 111 16 969 279 41 610 176 26 2) 2) 49 2) 2) 33 63% of kvs, refer to "kvs reduction" on page 4 MVL661.32-12.
Function / mechanical design • 4 selectable standard signals for setpoint and measured value • DIP switch to reduce the kvs value to 63% of the nominal value • • • • Drive Spring return facility Operator controls and indicators in the electronics housing Potentiometer for adjustment of minimum stroke for suction throttle applications Automatic stroke calibration Forced control input for “Valve closed” or “Valve fully open” LED for indicating the operating state The MVL661..-..
Minimum stroke setting Stroke 100 % 80 % 0% 0% 100 % Y-input In the case of a suction throttle valve, it is essential that a minimum stroke limit be maintained to ensure compressor cooling and efficient oil return. This can be achieved with a reinjection valve, a bypass line across the valve, or a guaranteed minimum opening of the valve. The minimum stroke can be defined via the controller and control signal Y, or it can be set directly with potentiometer Rv.
Indication of operating state LED Green Red Both Connection type 1) Indication Function Control mode Remarks, troubleshooting Automatic operation; everything o.k.
Engineering notes Depending on the application, additional installation instructions may need to be observed and appropriate safety devices (e.g. pressostats, full motor protection, etc.) fitted.
Mounting notes The valve should be mounted and commissioned by qualified staff. The same applies to the replacement electronics and the configuration of the controller (e.g. SAPHIR or PolyCool). 90° 4716Z16 90° 00441 • The refrigerant valves can be mounted in any orientation, but upright mounting is preferable. • Arrange the pipework in such a way that the valve is not located at a low point in the plant where oil can collect.
Technical data Functional actuator data Power supply • AC 24 V Extra low-voltage only (SELV, PELV) Operating voltage Frequency Typical power consumption Pmed Standby Rated apparent power SNA Required fuse External supply line protection • DC 24 V Signal inputs Signal outputs Positioning time Electrical connections Product data valve Operating voltage Current draw Control signal Y Impedance DC 0/2...10 V Impedance DC 0 / 4...
Materials Pipe connections Dimensions and weight Norms and directives Stroke resolution H/H100 Hysteresis Mode of operation Position when deenergized Orientation Valve body and parts Seat / piston Sealing disk Sleeves Dimensions Weight Electromagnetic compatibility (Application) Product standard EU Conformity (CE) RCM Conformity EAC Conformity Electrical safety Protection class Degree of pollution Housing protection Upright to horizontal Vibration 4) 1 : 1000 (H = stroke) Typically 3 % Modulating Contro
Connection terminals Connection diagrams Terminal assignment for controller with 4-wire connection (to be preferred!) Common transformer Separate transformer Terminal assignment for controller with 3-wire connection Common transformer Separate transformer U Indication of valve position (only if required). DC 0...10 V → 0...100% volumetric flow V100 Twisted pairs. If the lines for AC 24 V power supply and the DC 0...10 V (DC 2...10 V, DC 0... 20 mA, DC 4...
Dimensions H3 H1 H2 D H4 min. 100 Dimensions in mm L Type reference DN D [inch] D [mm] L [mm] H1 [mm] H2 [mm] H3 [mm] H4 [mm] T [mm] M [kg] MVL661.15-0.4 15 MVL661.15-1.0 15 5/8" 16 140 44 36 113 160 103 4.4 5/8" 16 140 44 36 113 160 103 4.4 MVL661.20-2.5 MVL661.25-6.3 20 7/8" 22 150 41 41 119 160 103 4.5 25 1 1/8" 28 160 40 47 126 160 103 4.6 MVL661.32-10 32 1 3/8" 35 190 43 54 142 160 103 6.1 MVL661.
Valve sizing with correction factor The applications and tables on the following pages are designed for help with selecting the valves.
Note on interpolation In practice, the KE, KH or KS value can be estimated because the theoretical kvs-value ascertained will be rounded off by up to 30% to one of the ten available kvs-values, allowing you to proceed directly at Step 4. Step 1: For tc = 45, calculate the value for to = 0 between values 40 and 60 in the table; result: 63.
Capacity control a) Refrigerant valve MVL661..-.. for capacity control of a dry expansion evaporator. Suction pressure and temperature are monitored with a mechanical capacity controller and reinjection valve. • Typical control range 0...100% • Energy-efficient operation with low loads • Ideal control of temperature and dehumidification 40155A MVL661 * b) Refrigerant valve MVL661..-.. for capacity control of a chiller. • Typical control range 10...
Correction table KE Expansion valve R32 1) tc \ to °C -30 -20 -10 R134a tc \ to 0 10 20 °C -30 -20 -10 0 10 0 125 126 30 - - - 20 57 59 62 43 - - 20 154 156 158 159 98 - 40 64 68 71 74 77 73 40 175 178 180 182 184 184 60 65 69 73 77 81 85 60 - - - - - 190 80 54 59 64 69 74 78 10 R290 1) tc \ to R448A tc \ to °C -40 -30 -20 -10 0 10 °C -40 -30 -20 -10 0 0 71 67 23 - - - 20 64 66 45 - - - 20 83 86 90 93
Use of the MVL661..-.. as a hot-gas valve The control valve throttles the capacity of a compressor stage. The hot gas passes directly to the evaporator, thus permitting capacity control in the range from 100% down to approximately 0%. + Indirect hot-gas bypass application 70179 Suitable for use in large refrigeration systems in air conditioning plant, to prevent unacceptable temperature fluctuations between the compressor stages.
Correction table KH Hot-gas valve Condenser Bypass R32 1) tc \ to °C -30 -20 -10 10 20 °C -30 -20 -10 0 10 0 17 16 8.2 - - - 20 9.9 9.7 9.3 7.5 - - 30 30 29 28 20 - 40 16 15 15 15 15 13 40 - - 46 45 44 42 60 24 23 23 22 22 21 60 - - - - - 61 80 - - 32 31 30 29 10 R290 1) R448A tc \ to °C -40 -30 -20 -10 0 10 °C -40 -30 -20 -10 0 0 11 10 0 - - - 0 9.6 9.2 7.
Use of the MVL661..-.. as a suction throttle valve + Typical control range 50...100%. Minimum stroke limit control: To ensure optimum cooling of the compressor, either a capacity controller must be provided for the compressor, or a minimum stroke must be set via the valve electronics. The minimum stroke can be limited to a maximum of 80%. At zero load, the minimum stroke must be sufficient to ensure that the minimum gas velocity in the suction line is > 0.7 m/s and that the compressor is adequately cooled.
Correction table KS Suction throttle valve ∆pv100 R32 1) tc ∆pv100 tc °C R134a bar °C -30 -20 -10 0 10 20 bar -30 -20 -10 0 10 0.2 20 2.8 3.5 4.3 5.1 6.1 - 0.06 20 0.69 0.90 1.1 1.4 - 0.2 55 - - 3.2 3.8 4.5 5.3 0.06 60 0.43 0.57 0.75 0.95 1.1 0.7 20 4.6 6.1 7.6 9.3 11.1 - 0.3 20 1.1 1.7 2.3 3.0 - - 0.7 55 - - 5.7 6.9 9.8 0.3 60 0.99 1.1 1.5 2.0 2.5 3.1 ∆pv100 tc ∆pv100 tc 8.3 R290 1) 20 1.
Revision numbers Product number Valid from rev. no. MVL661.15-0.4 C MVL661.15-1.0 C MVL661.20-2.5 D MVL661.25-6.3 C MVL661.32-10 A MVL661.32-12 C Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a 6300 Zug Switzerland Tel. +41 58-724 24 24 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd, 2011 Technical specifications and availability subject to change without notice.
