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• Apartments • Single-family houses • Autonomous light commercial applications The RRV851 controller is designed for central ducted HVAC systems that require easy Applications operation by the building occupant. The MMI to be connected to the controller is the QAX850 master room unit. Fan, heating and / or cooling outputs control the temperature in the building.
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• QAH11.1 Cable temperature sensor Note The QAX850 is the master MMI for the RRV851 and must be ordered as a separate item. Any additional remote temperature sensors must also be ordered separately. Terminal covers are included in the RRV851 box.
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(HB+ HB–) wires to the QAX850 from terminals HB+ and HB–. The LED on the QAX850 will flash if a communication error exists between RRV851 and QAX850 for longer than 5 seconds. RS-485 The RS-485 connections are only suitable for downloading manufacturer specific (TX+, TX–)
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DIP switch positions. DIP switches are located on the top of the controller. An adhesive label is included in the RRV851 packaging box for the final recording of the DIP switch positions. This can be placed on the DIP switch block to avoid unauthorized changes.
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0.1 K. The range is ±3 K. The RRV851 controller is operational after the DIP switch settings have been made and Commissioning power is connected. Default parameter settings are based on the application selected and may be modified if required.
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Mounting and installation notes The RRV851 controller can be mounted in any orientation using the following fixing options: DIN rail mounting Surface mounting The housing base is designed for snap- There are 2 drill holes for screw-mounting mounting on DIN rails conforming to (refer to “Dimensions”).
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(operational insulation) Y1x⇔Y2x⇔Y3x⇔Q7x⇔Q8x⇔Q9x AC 1250 V, to EN 60 730-1 HCC bus proprietary protocol Interfaces (S+, SG) Bus power supply voltage DC 12 V, +10, –15% (supply to room unit QAX850) 7/11 Siemens Temperature Controller RRV851 CE1N2725en Building Technologies 27.08.2007...
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EN 61 000-6-3 -conformity EMC directive 89/336/EEC Low-voltage directive 73/23/EEC N474 conformity to Australian EMC framework Radio Communication Act 1992 Radio interference emission Standard AS/NZS 4251.1 Excluding packaging approx. 0.735 kg Weight 8/11 Siemens Temperature Controller RRV851 CE1N2725en Building Technologies 27.08.2007...
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External supply line fusing, max. 10 A 1-speed fan RRV851 controller QAX850 master room unit Reversing valve Cooling output Heating output Auxiliary heating, emergency heating or 2 stage cooling Valve actuator, AC 24…230 V 9/11 Siemens Temperature Controller RRV851 CE1N2725en Building Technologies 27.08.2007...
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AC 24 /230V Heat pumps (application A5) (For single compressor heat pumps, CR2 is not connected) Note: Contact your local Siemens representative for application-specific wiring diagrams and information. • External supply line fusing must be used. Note STOP • All input and bus terminals are not protected against connection to AC 230 V.