Cooling with CHW (fan coil Heating with LTHW radiator Modulating control of heating and cooling valve Automatic or manual fan control

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1 Fan coil with two-pipe system (cooling) and radiators FC8 Cooling with CHW (fan coil Heating with HW radiator odulating control of heating and cooling valve Automatic or manual fan control Plant diagram 7032 YC R D D2 YC Room temperature controller Room unit with temp sensor Return air sensor Window switch Occupancy sensor Fan ( 3-speed) Heating valve (radiator) Cooling valve (fan coil) O R D D2 Operating diagrams 00 Y[%] H C YC 0 SpH SpC R [ C] Y Output signal R Room temperature SpH Effective heating setpoint SpC Effective cooling setpoint H Heating sequence C Cooling sequence Heating valve (radiator) YC Cooling valve (fan coil) 4 Fan speed Q24 Fan speed 2 Q34 Fan speed 3 Y Q34 Q24 4 SpC 70297A C R [ C] Siemens Building echnologies DESIO RXC Applications ibrary CA2A386E8 / Building Automation Application FC8 /6

D D2 Operating diagrams 00 Y[%] H 70284 C YC 0 SpH SpC R [ C] Y Output signal R Room temperature SpH Effective heating setpoint SpC Effective cooling setpoint H Heating sequence C Cooling sequence

2 Functions For details refer to the FC description of functions at the beginning of this section (CA2A386E00) Application FC8 includes the following functions: Function wo-pipe system (cooling) and radiator heating Fan control emperature measurement Operating modes Brief description PID control wo proportional control sequences, heating and cooling Cooling: Control of thermic or motorised valve actuators (AC 24 V, PW or AC 24 V, 3-position) Heating: Control of thermic valve actuators (AC 24 V, PW) Valve exercising feature Single speed (RXC20) or 3 speeds (RXC2) automatic or anual with room unit Room temperature sensor or Return air sensor Comfort, Stand-by, Economy and Building protection Change of operating mode via /Auto switch on room unit, occupancy sensor, window contact or central command See CA2A386E00 Setpoint adjustment ocally via room unit or via central command 4 eneral functions Room units Compatible controllers Occupancy sensor Window switch aster/slave operation Boost, night cooling etc Available with temperature sensor, setpoint adjuster, switch for Off/Auto and fan speeds, CD display FC8 can be used in conjunction with RXC20 and RXC , 3 22, 84 22, , 87 9 Connection diagrams O D 2) D2 2) 3) YC 3) R QAX D D D2 Y Y2 CP CP+ B RXC20 4) AC 230 V CA2A386E8 / DESIO RXC Applications ibrary Siemens Building echnologies 2/6 Application FC8 Building Automation

actuators (AC 24 V, PW or AC 24 V, 3-position) Heating: Control of thermic valve actuators (AC 24 V, PW) Valve exercising feature Single speed (RXC20) or 3 speeds (RXC2) automatic or anual with room

3 YC2 3) Y Y2 O D 2) D2 2) 3) YC 3) R QAX Q24 Q34 D D D2 Y Y2 Y3 Y4 CP CP+ B RXC2 4) AC 230 V 2) ype of operation (/O or /C) can be selected 3) Do not exceed the max simultaneous load on outputs Y Y4: max 95 VA (see data sheet 3834) 4) Do not connect the fans in parallel (or use cut-off relays) ist of equipment Ref Description ype Data sheet Room temperature controller RXC20 ) 3834 RXC2 R Room unit QAX30 QAX3 QAX32 QAX33 QAX34 QAX39 Wireless room unit Reciever Return air sensor QAX90, QAX9 RXZ90 QA22 QAP Room temperature sensor QAA24 72 D Window contact 2) hird-party device D2 Occupancy sensor 2) hird-party device Single-speed or 3-speed fan hird-party device hermic heating valve, 2-position (PW) control 3) YC hermic cooling valve, 2-position (PW) control 3) YC2 otorised cooling valve, (RXC2 only) 3-position control 3) SE7 SA7 3W, 4W SE72 SQS8 SSB ) Only for use with a 2-position valve actuator 2) ype of operation (/O or /C) can be selected 3) Do not exceed the max simultaneous load on outputs Y Y4: max 95 VA (see data sheet 3834) Siemens Building echnologies DESIO RXC Applications ibrary CA2A386E8 / Building Automation Application FC8 3/6

ype Data sheet Room temperature controller RXC20 ) 3834 RXC2 R Room unit QAX30 QAX3 QAX32 QAX33 QAX34 QAX39 Wireless room unit Reciever Return air sensor QAX90, QAX9 RXZ90 QA22 QAP22 74 74 64 642 645

4 Configuration he parameters below are available with application FC8 hey are set in the RX0 commissioning and service tool in the Device, Configure, Settings menu option enu Parameter Values/range Basic setting emperature setpoints Comfort heating 0 35 C 2 C Comfort cooling 0 35 C 24 C Stand-by heating 0 35 C 9 C Stand-by cooling 0 35 C 28 C Economy heating 0 35 C 5 C Economy cooling 0 35 C 35 C Building protection heating 0 40 C 2 C Building protection cooling 0 40 C 40 C Fan control Fan speeds anual Single-stage 2-stage (RXC2 only) 3-stage (RXC2 only) Sequences 3-speed (RXC2) -speed (RXC20) in run-time 0 min 6 min emperature sensor Room air Return air ime interval, 0:00 :00 h Room air 0 Valve type Cooling Heating SE72 SQS8 (RXC2 only) SSB8 (RXC2 only) hird-party device (RXC2 only) SE7 Room unit Sensor correction 3 3K 0K Setpoint adjustment range ± 0 0 K 3 K Display of heating/cooling symbol emperature unit C or F C SE72 SE7 emperature display in normal mode one / room temp / setpoint room temp emperature display in setpoint shift mode Absolute or relative Absolute eneral functions Occupancy override time 0 90 min 30 min OARK bindings Receive heartbeat 0 05 min 60 min Send heartbeat 0 05 min 45 min Occupancy sensor Digital input or 2 o occ sensor ype of operation: Room occupied: Contact open or closed Closed Switch-off delay 0 90 min 5 min Switch-on delay 0 90 min 5 min Window switch Digital input or 2 o window switch ype of operation: Window closed: Contact open or closed Closed aster/slave aster or Slave aster Heating demand signal Cooling demand signal orning boost ight cooling Service ED Reset shift See the sections headed onark network variables and onark binding templates Disabled CA2A386E8 / DESIO RXC Applications ibrary Siemens Building echnologies 4/6 Application FC8 Building Automation

C Building protection heating 0 40 C 2 C Building protection cooling 0 40 C 40 C Fan control Fan speeds anual Single-stage 2-stage (RXC2 only) 3-stage (RXC2 only) Sequences 3-speed (RXC2) -speed

5 Ordering Example otes Example 2 otes Room controllers may be ordered either with the application described above or with the appropriate basic application Please state the quantity, DESIO RXC device name, type code and application 5 RXC20 individual room controllers with application FC8 RXC20/FC8 he controllers will be delivered with the basic settings shown above inimum order quantity: 0 controllers 2 RXC20 room controllers RXC20 / 0002 he controllers will be delivered with the basic application he application can be loaded into the controllers by means of the RX0 tool inimum order quantity: controller inimum order quantity: 0 controllers Siemens Building echnologies DESIO RXC Applications ibrary CA2A386E8 / Building Automation Application FC8 5/6

order quantity: 0 controllers 2 RXC20 room controllers RXC20 / 0002 he controllers will be delivered with the basic application he application can be loaded into the controllers by means of

6 CA2A386E8 / DESIO RXC Applications ibrary Siemens Building echnologies 6/6 Application FC8 Building Automation

Application Sheet Fan coil unit with staged fan, heating/cooling coil (2 pipe) on analog output

Application Sheet Fan coil unit with staged fan, heating/cooling coil (2 pipe) on analog output Heating with LHW and cooling with CHW changeover Modulating control of heating and cooling valve (2 pipe) on analog Automatic or manual 3-speed fan control Room temperature and fan speed operation via