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FCU thermostat Modbus
RDF230MB
A6V13602117_en--_b
2024-03-22
Fan coil unit thermostat Modbus
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Slim (8.6 mm thickness) touch button design
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AC 230 V operating voltage, large LCD backlit display
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Fan coil applications
– 2-pipe fan coil, on/off valve output with 3-speed fan
– 2-pipe FCU for cooling + floor heating
– 4-pipe fan coil, on/off valve output with 3-speed fan
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Operating modes: ON, ECO and OFF
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Room temperature or temperature setpoint display
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Room temperature display via built-in sensor, external sensor or RS485
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Temperature setpoint adjustment
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Minimum and maximum setpoint limitation
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Fan mode: Auto and manual
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Automatic or manual heating/cooling changeover
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1 multifunctional input X1 for external sensor, etc.
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Fan type selection: 1-speed or 3-speed
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Simple delay-off timer up to 23 hours
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Keylock function
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Returning to previous operating mode, ON (Normal mode) or OFF for power down
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Adjustable commissioning and control parameters
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Communication with Modbus RTU client
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Mounting on recessed square 86 mm conduit box with 60.3 mm fixing centers and
min. 60 mm depth
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Summary of Contents for Siemens RDF230MB
- Page 1 FCU thermostat Modbus RDF230MB Fan coil unit thermostat Modbus ● Slim (8.6 mm thickness) touch button design ● AC 230 V operating voltage, large LCD backlit display ● Fan coil applications – 2-pipe fan coil, on/off valve output with 3-speed fan –...
- Page 2 Enable delay-off timer: up to 23 hours (P31) ● Reset parameters (P89) Mechanical design The thermostat consists of three parts: ● LCD display ● Decoration frame ● Mounting plate to fit onto a square conduit box with 60.3 mm fixing centers. Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 3 RDF230MB S55770-T500 AC 230 V FCU Thermostat Modbus White Ordering When ordering, specify both product number / stock number and name: e.g. RDF230MB / S55770-T500 FCU Thermostat Modbus Order valve actuators and external sensors separately. Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 4 (only available in AP, UAE, SA and IN) Electromotive ON/OFF actuator SFA21... N4863 Zone valve actuator (only available in AP, SUA... A6V10446174 UAE, SA and IN) All documents can be downloaded from http://siemens.com/bt/download. Product documentation Title Document ID Mounting instruction A6V13602128 Operating instruction A6V13602130...
- Page 5 Disconnect from supply before removing the unit from its mounting plate. ● Isolate the cables of all SELV terminals for AC 230 V, e.g., Modbus communication input A+, B- and REF for AC 230 V. Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 6 2-pipe 2-pipe FCU for cooling + floor heating 4-pipe For manual changeover with 4-pipe applications, see 4-pipe fan coil unit [▶ ● 4-pipe manual changeover (P02 = 3) means activating either cooling or heating outputs Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 7 The diagrams below show the control sequence for On/Off control. On/Off control Floor heating mode FCU cooling mode T[°C] Room temperature Control command "Valve" (floor heating) Room temperature setpoint Control command "Valve" (FCU cooling) Switching differential "Heating" Switching differential "Cooling" (P40) (P41) Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 8 Cooling mode with manual selection (P02 = 3) (P02 = 3) T[°C] Room temperature Control command "Valve" (heating) Room temperature setpoint Control command "Valve" (cooling) Dead zone (P42) Switching differential "Heating" (P40) Switching differential "Cooling" (P41) Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 9 Press + or - (< or >) to access the desired parameter and the value of the selected parameter is displayed at the same time. Press ( ) to edit the value of the required parameter. Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 10 0 = OFF 1 = Standard display temperature in different unit (C/F) 2 = Temperature setpoint 3 = Temperature via bus 4 = Time of day (12h) via bus 5 = Time of day (24h) via bus Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 11 3 = Window open detection 6 = Fault contact 7 = Monitor the state of an external switch 8 = Monitor the state of an external sensor 9 = Presence detection 10 = Hotel key card Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 12 Test mode for checking Q1 output OPE = Output Q1 forced opening CLO = Output Q1 forced closing Test mode for checking Q2 output OPE = Output Q2 forced opening CLO = Output Q2 forced closing Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 13 The users desired setpoint and the unit controls the room temperature accordingly. Keylock Keylock can be activated or deactivated via parameter P15 (see Control parameters [▶ when the unit is in ON and OFF mode. Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 14 3 seconds to view the remaining time. - Use + or - to change the time and press ( ) to confirm the new value. - The timer runs according to the new value. Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 15 => 'Siemens Security Advisories' Warranty Technical data on specific applications are valid only together with Siemens products listed under "Equipment combinations". Siemens rejects any and all warranties in the event that third-party products are used. Siemens...
- Page 16 SELV signal (A, B, Ref, X1, M1) 0.5…1.5 mm Wire Solid or prepared stranded Output 1-/3-speed fan Q1…Q3 Type On/Off Voltage AC 230 V Maximum current 5(3) A Valve output Y11, Y12 (N.O.) Voltage AC 230 V Maximum current 5(3) A Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 17 - 5.0...+5.0 K Resolution of settings and display - Temperature setpoints 0.5 °C - Current temperature value displayed 0.5 °C Note: The standard range is 5...40 °C. Customization is available upon request (e.g. 0…50 °C). Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 18 Directive 2011/65/EU restriction of the use of certain hazardous substances in electronic equipment Environmental compatibility The product environmental declaration (A5W00277728A *) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal). Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 19 General Weight without/with package 154.9 g / 272 g Materials ● Front cover ● ● Mounting base ● PC + 10% GF Housing flammability class according to UL94 The documents can be downloaded from http://siemens.com/bt/download. Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 20 Diagrams Connection terminals RDF230MB L, N, N AC 230 V power supply, mains and neutral Fan control output (relay output), Q1-low (AC 230 V) Fan control output (relay output), Q2-middle (AC 230 V) Fan control output (relay output), Q3 -high (AC 230 V)
- Page 21 Bit0: (BUS) communication error Bit1: (AL1) External fault input 1 Bit2: (Er1) Built-in sensor error Bit3: (Er2) TOUCH IC and EEPROM error Bit4: (Er3) External input X1 error, e.g., sensor or switch is broken or removed Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 22 0x03 0x06 0 = Unlock 1 = Lock (all lock) 2 = Setpoint adjustable 3 = Setpoint lock 4 = Fan lock 5 = Operating mode lock 0011 1 0x03 0x06 5 ℃ 5...(P21-1) °C Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 23 9 = Presence detection (DI) 10 = Hotel key card (DI) 0024 1 0x03 0x06 0 = Open 1 = Close 2 = NTC 3k 3 = NTC 10k 0025 1 0x03 0x06 16 °C 10...25 °C Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 24 0 = Close Window state 1 = Open Room operating mode: 0107 1 0x03 0x06 0 = Inactive Presence detector 1 = Active Room operating mode: 0108 1 0x03 0x06 0 = Inactive Keycard 1 = Active Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 25 * The parameter is visible only when P01 = 0 or invisible (actual output is On/Off 2-wire valve) when P01 = 1 or ** As the resolution is in 10 hours, when value "1" displays, it stands for 10 fan operation hours. Siemens A6V13602117_en--_b...
- Page 26 2-pipe FCU for cooling + floor heating YHC Heating/cooling valve actuator M1 1-speed or 3-speed fan YH Heating valve actuator YC Cooling valve actuator B1 Return air temperature sensor or B2 Changeover sensor (optional) external room temperature sensor (optional) Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 27 Dimensions (mm) Siemens A6V13602117_en--_b Smart Infrastructure 2024-03-22...
- Page 28 Issued by © Siemens 2023 Siemens Switzerland Ltd Technical specifications and availability subject to change without notice. Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug +41 58 724 2424 www.siemens.com/buildingtechnologies Document ID A6V13602117_en--_b Edition 2024-03-22...
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