Ultrasonic heat and cooling 2WR6.. energy meters Ultrasonic heat and cooling energy meters to measure flow and energy in hydronic heating or cooling circuits. • Non-wearing due to non-moving parts • Approved in accordance with EN 1434 and MID accuracy class 2 • Mounting position optional (horizontal or vertical), in return or flow • Metering range for flow 1:100 as per EN1434 (total range 1:500) • No inlet or outlet settling paths required • Optical interface as per EN 62056-21 • M-bus communication • Self-diagnostics Building Technologies

The types of ultrasonic heat meters Place of installation Rated pressure Length of control cable Sensor mounting Temperature sensor type Power supply Temperature sensor cable length Communication Approval Energy unit listed below are equipped as follows: Return PN 16 1.5 m Return sensor, integrated in the flow measuring section Pt500, 0 5.2 mm, length = 45 mm Pt500, DS M10x1, length = 27.5 mm Battery with a life of 11 years or AC/DC 24 V 1.5 m M-bus EN 1434 class 2 MID 2004/22/EG kWh/MWh Siemens Building Technologies Ultrasonic heat and cooling energy meters 2WR6..

Siemens Building Technologies Ultrasonic heat and cooling energy meters 2WR6..

Read and parameterization software The UltraAssist Light read and parameterization software is free and available on request. Programming accessories Optical read head with USB plug for PC interface Siemens Building Technologies Ultrasonic heat and cooling energy meters 2WR6..

When ordering, please give quantity, description, product no. and stock number. Order numbers Scope of delivery The 2WR6.. is supplied complete with Mounting Instructions in different languages, 2 gaskets and a seal. Languages The Mounting Instructions are supplied in 18 languages: Bulgarian, Chinese, Croatian, Czech, Dutch, English, French, German, Greek, Hungarian, Italian, Norwegian, Polish, Russian, Slovakian, Slovenian, Spanish and Turkish. Siemens Building Technologies Ultrasonic heat and cooling energy meters 2WR6..

The 2WR6.. has an easy-to-read 7-digit LCD to show different readings (e.g. energy or volume). The meter’s display is arranged in the form of 2 loops: - User loop - Service loop When making a short press (<2 seconds), the user loop appears, showing line by line. After the last line, the first line reappears. When making a long press (>10 seconds), the service loop returns to the first line. Short presses then show the loop’s individual lines. The service loop can be quit by pressing the button (3 seconds), or automatically after 30 minutes. User loop LOOP 0 Service loop LOOP 1 Siemens Building...

Monthly values Standard parameters The processor stores the meter readings of energy, volume and missing time with their date stamps on a yearly due day. The due day for previous year values can be parameterized. The processor stores the meter readings of energy, volume and missing time with their date stamps for up to 15 months on the due day of each month. The 2WR6.. comes programmed as follows: • Due day [TT.MM]: 01.01 Siemens Building Technologies Ultrasonic heat and cooling energy meters 2WR6..

Mounting Flow measuring section Note The meter’s mounting position is optional, the place of installation (return or flow) must correspond to the type of meter used. The flow measuring section must always be installed in the return. Inlet or outlet settling paths are not required. If the meter is installed in the common return of 2 heating circuits (e.g. space heating and DHW), the place of installation must have an adequate distance from the T-piece (min. 10 x DN) to allow the different water temperatures to properly mix. Before installing the meter, the system must be thoroughly flushed. Install...

Transducer cover Permissible mounting position when metering cooling energy Processor The ambient temperature at the processor must not exeed 55 °C. Direct sunlight must be avoided. For water temperatures between 10 °C and 90 °C, the processor can be left on the flow measuring section or can be secured to the wall (detached mounting). To reposition the processor, remove it from the flow measuring section, turn it by 90° or 180° and replace it on the adapter plate until it snaps into place. For water temperatures above 90 °C or below 10 °C, the processor must be secured to the wall (split mounting)....

Processor Power supply alternatively - Battery Battery type Battery voltage Battery service life Lithium battery (cannot be replaced) 3.6 V 11 years Via external SELV - Voltage range - Frequency - Maximum power consumption - Length of connecting cable - Galvanic separation Function data Measuring range (national approvals may differ) Range of temperature differential A© Temperature response threshold Thermal coefficient Temperature measuring error without sensor Temperature sensors Sensing element Flow measuring section Function data Temperature range (national approvals may differ) Max. temperature...

Optical interface - Design - Protocol M-bus interface - Voltage Vmax. - Current draw - Addressing - Permissible average reading frequency 50 V 1.3 M-bus loads Primary or secondary 1x every 3 hours @ 2400 Bd 1x every 24 hours @300 Bd as per EN 13757-2/-3 Pulse output - Pulse valency - Pulse duration - Voltage - Current - Classification - Voltage drop - Dielectric strength Cable length Protection data Housing protection data Control cable 1 pulse per kWh or MJ/1 pulse/100 liters 100 ms Max. 30 V Max. 30 mA OB (as per EN 1434-2) Approx. 1.3 V at 20 mA 500 Veff against ground as per EN 1434-2 1 m...

Connection diagram Power supply AC/DC 24 V and M-bus Battery power supply and M-bus 13 / 14 Siemens Building Technologies Ultrasonic heat and cooling energy meters 2WR6..

Temperature sensor 45 mm for protection pocket mm for direct fitting Protection pocket Mounting sensor adapter set 14 / 14 Siemens Building Technologies Ultrasonic heat and cooling energy meters 2WR6..