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Buderus RC20, Installation And Service Instructions Manual

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Buderus RC20 Installation And Service Instructions Manual Download Page 12

Installation

3

12

Installation and service instructions RC20 room controller • Issue 08/2006

We reserve the right to make any changes due to technical modifications.

3.3.2

Making the electrical connections

z

Feed the cable ends through the opening in the mounting plate.

z

Connect the two-core bus cable from the Energy Management 
System (EMS) to the "RC" cable terminals (Fig. 4). There is no 
fixed polarity.

Fig. 4

Making electrical connections

Item 1:

"RC" connection to the EMS (boiler)

Item 2:

"EXT" connection (no function on RC20)

1

2

6304 5126-02.0K

USER NOTE

It is not possible to connect an external temperature sensor to the 
"EXT" (Fig. 4,

Item 2

) cable terminals. The "EXT" cable terminals 

have no function on the RC20 room controller.

Summary of Contents for RC20

Page 1: ...7 747 006 248 08 2006 GB For heating engineers Please read carefully prior to commissioning or servicing Installation and service instructions RC20 room controller ...

Page 2: ...7 2 2 Standards and guidelines 7 3 Installation 8 3 1 Tools required 8 3 2 Requirements 8 3 3 Installation and connections 10 4 Switching on and off 14 4 1 Start up 14 4 2 Shutdown 14 4 3 Operating tips 15 5 Service 16 5 1 Using the service level 16 5 2 Parameter overview 18 5 3 Adjusting parameters 19 5 4 Address 1 19 5 5 Heating system 20 5 6 Room temperature compensation 21 5 7 DHW heating 21 5...

Page 3: ...ntents 3 We reserve the right to make any changes due to technical modifications Installation and service instructions RC20 room controller Issue 08 2006 6 Troubleshooting 26 7 Setup report 29 8 Index 30 ...

Page 4: ...t not be used with the control devices of the Logamatic 2000 3000 4000 family 1 2 Please observe these safety instructions The RC20 room controller has been designed and built in accordance with currently recognised standards and safety requirements However material damage resulting from inappropriate handling of this device cannot be completely excluded z Only use the room controller for the purp...

Page 5: ...uctions are handed over to the customer and stored in the vicinity of the heating system CAUTION SYSTEM DAMAGE through frost The heating system can freeze up in cold weather if it is shut down z Protect your heating system against freezing by draining the heating system and DHW pipework at the lowest possible point z Please read the note on frost protection see section 4 3 Operating tips page 15 T...

Page 6: ...fied personnel Only use the RC20 room controller in combination with the accessories and spare parts specified in these instructions Use alternative accessories and wearing parts only if these are specifically designed for the intended application and impair neither the performance nor infringe the mandatory safety requirements USER NOTE All modifications and settings made on the RC20 room control...

Page 7: ...ll local regulations and the regulations of the energy supply company applicable to the electrical installation Unit RC20 Supply voltage V 16 V DC Power consumption W 0 15 Dimensions Width Height Depth mm 108 90 35 Weight g 140 Operating temperature C 0 to 50 Storage temperature C 0 to 70 Relative humidity 0 to 90 Tab 1 Specification for the RC20 room controller Applicable product standards Safety...

Page 8: ...room To ensure the heating control unit works properly the RC20 room controller must be installed in a suitable reference room see User Manual Alternative heat sources sunlight or other heat sources such as an open fire in the reference room affect the control function of the RC20 If there are alternative heat sources in the reference room rooms without alternative heat sources may be too cold USE...

Page 9: ...om controller and the distance from the door are important in order to obtain accurate measurement results 3 2 3 Connection cable The cable used to connect the RC20 room controller to the heating system Energy Management System EMS must meet the following specifications Fig 1 Installation position for the RC20 room controller in the reference room dimensions in metres Item 1 Free space Number of c...

Page 10: ...lease button on the bottom of the mounting plate Fig 2 step 1 z Remove the mounting plate in the direction shown by the arrow Fig 2 step 2 Fig 2 Removing the room controller from the mounting plate 2 1 USER NOTE The mounting plate can be affixed directly to the plaster or to a flush mounted box If you mount the room controller on a flush mounted box ensure that any draught from the box cannot dist...

Page 11: ...Fig 3 z Insert the supplied wall plugs into the drilled holes Fig 3 Item 1 z Fix the mounting plate using the screws supplied Fig 3 Item 2 Fig 3 Fixing the mounting plate to the wall surface Item 1 Hole drilled in the wall Item 2 Screws supplied for installation on plastered walls Item 3 Vertical fixing holes for installation on a flush mounted box Item 4 Horizontal fixing holes for installation o...

Page 12: ...ting plate z Connect the two core bus cable from the Energy Management System EMS to the RC cable terminals Fig 4 There is no fixed polarity Fig 4 Making electrical connections Item 1 RC connection to the EMS boiler Item 2 EXT connection no function on RC20 1 2 6304 5126 02 0K USER NOTE It is not possible to connect an external temperature sensor to the EXT Fig 4 Item 2 cable terminals The EXT cab...

Page 13: ...he RC20 room controller to the mounting plate in the direction shown by the arrow Fig 5 step 1 z Push the bottom of the RC20 room controller against the mounting plate in the direction shown by the arrow until it clicks into place Fig 5 step 2 3 3 4 Removing the RC20 room controller z Unclip the RC20 room controller from the bottom of the plate Fig 5 step 2 and unhook from the top Fig 5 Fitting th...

Page 14: ...s a corresponding error message is displayed see section 6 Troubleshooting page 26 4 2 Shutdown The RC20 room controller can be switched off by switching off the heating system USER NOTE 1 On commissioning the system for the first time during initialisation the address parameter is used to specify whether the room controller is to be installed as the sole programming unit or as a remote control un...

Page 15: ...d night mode Switch off is not possible in night mode temperature reduction only Important If the room temperatures have been set below 10 C there is no absolute frost protection because for example pipes routed through external walls could freeze up even though the temperature in the reference room is substantially higher than 5 C due to external heat sources Pump kick 2 In all operating modes al...

Page 16: ...evel During commissioning various parameters need to be set or checked These parameters are set at the service level The service level is operated using the pin button and the rotary selector Calling up the service level Press the pin button to call up the service level Release the pin button Fig 6 Pin button Item 1 Rotary selector Item 2 Pin button Item 3 Pin to press the pin button 2 1 3 ...

Page 17: ...in either direction to scroll through the service level menu Fig 7 Hold down the pin button to display the parameter value Hold down the pin button and turn the rotary selector at the same time to change the value displayed Release the pin button to save the value Fig 7 Service level menu structure Value Value Value Press the AUT button or turn the rotary selector until appears and then press the ...

Page 18: ...ss always 1 P2 Adjusting the heating system only if master P1 0 P3 Calibrating the room temperature always P4 Installing DHW only if master P1 0 P5 Setting pump type for boiler only if master P1 0 1 P6 Setting pump run on time only if internal boiler pump P5 1 1 P7 Setting standard display always P8 Adjusting time only if master P1 0 P9 Setting pasteurisation thermal disinfection only if master an...

Page 19: ...on to call up the service level Use the rotary selector to select the required parameter P1 Hold down the pin button and turn the rotary selector to set the address 2 USER NOTE All other parameters can be set in the same way P1 Setting Explanation 0 Sole programming unit factory setting RC20 operates independently without any other programming units in the system RC20 is master on the EMS bus Only...

Page 20: ... in rooms other than the reference room to be compensated for 2 Room output Room temperature control that responds dynamically to deviations between the temperature setting and the actual room temperature by changing the boiler output Set P2 to 2 if there are no major variations in load and only the reference room is to be controlled e g open plan house This means that changes in the heat output d...

Page 21: ... thermometer directly adjacent to the room controller If the RC20 room controller measures a temperature that is 0 1 C below the value measured by the thermometer then enter 0 1 C as the calibration value The RC20 room controller then displays a temperature that is 0 1 C higher than the measured value 5 7 DHW heating Here you can specify whether you require instantaneous water heating from the boi...

Page 22: ...0 RC35 P5 Setting Explanation 0 No pump 1 Internal pump factory setting In the event of a DHW or heat demand from the UBA3 MC10 the internal pump is switched on at the same time as the burner and switches off again after the preset pump run on time If a low loss header or a three way changeover valve is installed you must select 1 2 Heating circuit pump The heating circuit pump is started by the U...

Page 23: ...y Parameter P7 enables one of the following values to be selected as the standard display P6 Setting Explanation 0 60 Run on time for internal pump factory setting 5 min 24 h Internal pump in constant operation USER NOTE Parameter P6 is only available with internal pumps P5 1 P6 is hidden if No pump P5 0 or Heating circuit pump P5 2 is selected P7 Actual room temperature factory setting Outside te...

Page 24: ...an be used to correct it If the clock in the RC20 room controller is slow e g by two seconds a day enter 2 as the correction value P8 Input range Factory setting P8 adjusting the time 30 to 30 s day 0 s day USER NOTE This parameter is not shown if the room controller is installed as a remote control unit P1 0 The time of day and the day of the week are taken automatically from the RC30 RC35 where ...

Page 25: ...process the circulating pump runs constantly P9 is not shown if the RC20 is installed as a remote control unit P1 0 In this case adjust the thermal disinfection on the programming unit e g RC30 RC35 as described in the RC30 RC35 User Manual 5 13 Displaying the software version The RC20 software version is stored in parameter P10 For example 2 00 denotes version V2 00 P9 Setting Explanation 0 No pa...

Page 26: ...heck sensor connection and sensor cable Check mounting of sensor on storage cylinder Compare resistance value with sensor curve A01 810 1 DHW remains cold The system constantly tries to heat the hot water cylinder to the hot water temperature setting DHW priority is switched OFF after the error message is displayed Constant drawing or system leak If necessary fix the leak Sensor connected or mount...

Page 27: ...ict RC30 RC35 and RC20 control both HC1 and DHW Depending on the heating programs selected and the room temperature required the heating system may no longer operate correctly Faulty operation of DHW heating RC20 logged in the system as sole programming unit master with RC30 RC35 as master Change the address parameter P1 in the RC20 or remove RC30 RC35 from the EMS A18 806 Room temperature sensor ...

Page 28: ...rve the right to make any changes due to technical modifications USER NOTE System faults do not require a reset If you cannot rectify the system fault please contact your service engineer or your local Buderus sales office Refer to the boiler documentation for information on how to remedy other faults ...

Page 29: ... compensation 5 0 C to 5 0 C 0 0 C always P4 DHW heating 0 no 1 yes 0 only if master P1 0 P5 Pump type 0 no pump 1 internal pump 2 heating circuit pump 1 only if master P1 0 1 P6 Pump run on time 0 60 min 24 h 5 min only if internal boiler pump P5 1 1 P7 Standard display Room temperature outside temperature time Room temperature always P8 Adjusting the time 30 to 30 s day 0 only if master P1 0 P9 ...

Page 30: ...ult table 26 Flow temperature changing 20 Frost protection 15 H Heat emission 20 Heating circuit pump 22 Heating system 20 I Installation position 9 M Master function 15 O Outside temperature 23 P Parameter overview 18 Pin button 16 Programming unit sole 19 Pump internal 22 Pump kick 15 Pump run on time 23 Pump type 22 R Reference room 8 20 Remote control 19 Reset 28 Room flow 20 Room output 20 Ro...

Page 31: ...Notes 31 We reserve the right to make any changes due to technical modifications Installation and service instructions RC20 room controller Issue 08 2006 ...

Page 32: ...don Worcester WR4 9SW Tel 01905 752794 Fax 01905 753130 www buderus commercial co uk In the UK Buderus is a trading name of BBT Thermotechnology Ltd BBT Thermotechnik GmbH D 35573 Wetzlar www heiztechnik buderus de info heiztechnik buderus de ...

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