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Baxi QAA73.110, Basic Documentation

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QAA73.110

Room Unit for Boiler Control with OpenTherm 

Interface

Basic Documentation 

Summary of Contents for QAA73.110

Page 1: ...QAA73 110 Room Unit for Boiler Control with OpenTherm Interface Basic Documentation ...

Page 2: ...ing 20 2 10 Operational faults 21 3 Description of enduser settings 22 User interface 22 3 1 Heating circuit operating modes 22 3 2 Operating mode of d h w heating 22 3 3 Occupancy button 23 3 4 Info button 23 Time of day 24 3 5 Time of day date and year 24 Setpoints 25 3 6 Nominal room temperature setpoint 25 3 7 Reduced room temperature setpoint 26 3 8 Frost protection setpoint of room temperatu...

Page 3: ...art control 46 4 20 Maximum forward shift for optimum stop control 46 D h w 47 4 21 Reduced setpoint of the d h w temperature 47 4 22 Release of d h w heating 47 4 23 Legionella function 48 4 24 D h w operating mode selector 49 4 25 Control of d h w circulating pump 49 General 49 4 26 Programming 49 4 27 Clock time master 51 4 28 Winter summertime changeover 51 4 29 Summer wintertime changeover 52...

Page 4: ... 6 1 2 Weather compensation with room influence 60 6 1 3 Room compensation 61 6 2 Automatic 24 hour heating limit 61 6 2 1 Without room influence 61 6 2 2 With room influence 62 6 3 Quick setback with room influence 63 6 4 D h w push 63 6 5 Frost protection 64 6 5 1 Frost protection for the building 64 6 5 2 Frost protection for the boiler and the d h w 64 7 Dimensions 65 8 Technical data 66 ...

Page 5: ...isplayed and thus acknowledged Yearly clock with automatic summer wintertime changeover One heating program per heating circuit with up to 3 heating periods per day can be selected on an individual basis D h w program with up to 3 heating periods per day can be selected on an individual basis Holiday program The heating programs and the d h w program can be reset to their default settings Programm...

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Page 13: ... by boiler control Only then is the full functionality of the QAA73 110 ensured so that the most common applications can be fully covered If a parameter is not supported by boiler control the display shows 3 strokes in place of a value 2 6 Parameter settings for the enduser The following settings can be made to meet the individual needs of the enduser Buttons Explanation Line 1 PROG Press one of t...

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Page 15: ... seconds This will take you to the programming level Heating engineer 51 3 PROG Press the line selection buttons to select the required line The parameter list on the next pages contains all available lines 51 98 4 Press the or button to set the required value The setting will be stored as soon as you leave the programming mode or change to another line The parameter list on the next pages contain...

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Page 18: ... access code If the combination of buttons is correct you reach the programming mode OEM Î Wrong code If the code has been entered incorrectly the display will change to the Parameter settings for the heating engineer 4 PROG Press the line selection buttons to select the required line The parameter list on the next 2 pages contains all available lines 100 199 5 Press the or button to set the requi...

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Page 20: ... TR and the manual reset safety limit thermostat STB Check wiring and fuse of boiler control Check the communication link to boiler control The room temperature does not agree with the required temperature level Does the room temperature setpoint agree with the required temperature level Is the required operating mode indicated Are weekday time of day and the displayed heating program correct Info...

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Page 23: ...ine selection buttons to select line 1 2 or 3 2 Press the buttons to set the current values Line Setting range Unit 1 2 3 00 00 23 59 1 Jan 31 Dec 2000 2094 Minute hour day month year Time of day date and year will be set to their current values These settings are important ensuring that the heating program the d h w program the holiday program and summer wintertime changeover of the room unit ope...

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Page 29: ...eriod the heating level will be reduced either to Reduced or Frost according to the parameter setting made on programming line 42 During the holidays d h w heating is locked On completion of the holiday period the current room unit settings apply again The dates of the start and the end of the holiday period will automatically be cleared when the holidays are over The entered holiday period is cle...

Page 30: ...lay changes to Yes Display Unit No yes In that case the individual settings will be lost The time settings for the time switch programs will be overwritten with standard values This applies to the following settings Switching times of time switch programs 1 and 2 11 16 or 21 26 Switching times for d h w program 31 36 Switching point Setting line TSP1 or 2 d h w Standard time Switch on time period ...

Page 31: ...ctive periods of time will be shortened or extended The change will only affect the heating circuit Entry Increase Winter operation will start earlier Summer operation will start later Decrease Winter operation will start later Summer operation will start earlier To determine changeover the setting of the summer winter changeover temperature a fixed switching differential is compared with the atte...

Page 32: ...d is always the fault with the highest priority most severe fault If other faults are present at the same time the next fault with the highest priority will be displayed after the present fault has been corrected In the case of a room unit specific fault or a fault of Siemens boiler control the error code and appropriate error text will be displayed 2284z25 Example of own fault display In the even...

Page 33: ...ectified Press the Info button to select Info line 3 If a status code is indicated the fault status code symbol flashes When pressing the Info button the relevant status code is displayed in clear text Display QAA73 110 Description of error None No service required Maintenance Boiler or burner service required Chimney sweep Chimney sweep function active Controller stop Controller stop function act...

Page 34: ...mperature that affects the room temperature Consideration is given to the building s thermal storage capacity The attenuated outside temperature is generated by the room unit It is continually calculated based on the prevailing outside temperature Operating line 53 automatically displays the actual value C of the attenuated outside temperature No direct setting can be made The generation of the at...

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Page 36: ...s to select line 56 Display Unit 0 16 l min 4 6 Actual boiler return temperature The current boiler return temperature is displayed Press the line selection buttons to select line 57 Display Unit 40 127 C 4 7 Actual value of the flue gas temperature The current flue gas temperature is displayed Press the line selection buttons to select line 58 Display Unit 40 500 C 4 8 Actual value of solar colle...

Page 37: ...ne signal to the boiler control for controlling the heat output In the event of fault boiler control signals Boiler Lock Out Fault to the QAA73 110 Press the line selection buttons to select line 62 Display Unit Lite Plus Directly after connection of OpenTherm the QAA73 110 ascertains whether boiler control supports the OpenTherm Plus or the OpenTherm Lite protocol The protocol currently used will...

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Page 41: ...ns Light Light building structures The room temperature will respond quicker to outside temperature variations Heavy building structures Buildings with thick walls or with external insulation Light building structures Buildings with a light envelope 4 16 Room influence Owing to the temperature checkback signal received from the room a constant room temperature is maintained and if required boost h...

Page 42: ...iler control Room influence must be enabled to act on the relevant heating circuits There may be no thermostatic radiator valves in the reference room If such valves are present they must be set to their fully open position 4 17 Switching differential of the room temperature It is used for room temperature limitation This function is recommended for pump heating circuits and prevents the rooms fro...

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Page 45: ...on calculates the changeover time such that at the start of occupancy the room temperature will have reached the nominal setpoint The switch on point for the heating system change to the nominal temperature level is selected such that at the start of occupancy according to the heating program the room temperature reached will be the setpoint minus 0 25 K Optimum start control only acts on the firs...

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Page 47: ... ensures that the d h w in the storage tank will periodically be raised to a temperature of at least 60 C thus making certain that potential legionella viruses will be killed Diese Funktion darf für Brauchwassersysteme mit Durchlauferhitzer nicht eingeschaltet sein 1 Press the line selection buttons to select line 92 2 Press the buttons to activate or deactivate the legionella function Setting ran...

Page 48: ...ctory setting Release of d h w Prog 2 D h w program Release of d h w according to d h w release The d h w circulating pump is activated and deactivated according to the d h w release selected on line 91 During that period of time the circulating pump operates continuously without giving consideration to actual d h w heating Prog 3 according to time switch program 3 The d h w circulating pump is co...

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Page 50: ...ly every 5 minutes from the boiler control In that case the time of day cannot be readjusted on the QAA73 110 4 28 Winter summertime changeover This function enables the yearly clock to automatically switch to wintertime 1 Press the line selection buttons to select line 97 2 Press the buttons to set the date of changeover Setting range Unit Factory setting 1 Jan 31 Dec dd mm 25 March On the Sunday...

Page 51: ...arly clock to automatically switch to wintertime 1 Press the line selection buttons to select line 98 2 Press the buttons to set the date of changeover Setting range Unit Factory setting 1 Jan 31 Dec dd mm 25 Oct On the Sunday following the set date the time of day of the room unit will switch to wintertime For that purpose the time of day is shifted backward by one hour Description Line 98 Effect...

Page 52: ...ain factor of room influence KORR Defines the influence of room temperature setpoint deviations on the controlled system The room influence can be activated and deactivated operating line 75 1 Press the line selection buttons to select line 102 2 Press the buttons to set the gain factor Setting range Unit Factory setting 0 20 4 Changing this setting has the following impact Increase Authority of r...

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Page 55: ... be more accurate 1 Press the line selection buttons to select line 106 2 Press the buttons to select the required correction of the sensor characteristic Setting range Unit Factory setting 3 3 ºC 0 The sensor characteristic is displaced parallel by the selected value When entering a negative value the temperature measured will be lowered by that value when entering a positive value it will be rai...

Page 56: ...at least the period of time set here Setting range Unit Factory setting 0 360 min 0 Function deactivated no dwelling time The dwelling time starts as soon as the legionella setpoint is reached During the entire dwelling time the temperature may not fall below the legionella setpoint by more than the set LMU d h w switching differential standard setting 5K 2K The legionella function is terminated w...

Page 57: ...is displayed for only 8 minutes After that period of time the display will return to the standard display actual room temperature time of day and time pointer Continuously The information selected last with the Info button will be continuously displayed 5 12 Frost warning A frost warning can be generated depending on a selectable outside temperature 1 Press the line selection buttons to select lin...

Page 58: ...can apply to both heating circuits 1 Press the line selection buttons to select line 153 2 Press the buttons to select the required function Setting range Unit Factory setting On HC1 HC2 on HC1 On HC1 HC 2 When pressing the occupancy button in automatic or continuous operation either both heating circuits or only heating circuit 1 is acted upon 5 15 Software version The software version installed ...

Page 59: ...quate flow temperature The colder the weather the quicker the building cools down and the greater the heating circuit s heat demand With this type of compensation it must be ensured that the heating curve is correctly set because the room unit gets no feedback from the space whether the amount of heat supplied meets the demand of the users The room influence line 75 must be set to None and in addi...

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Page 65: ...nation environment to EN 60730 Operation IEC 721 3 3 class 3K 5 Temperatures 0 0 50 C Humidity 85 r h Transport IEC 721 3 2 class 2K 3 Temperatures 25 70 C Humidity 95 r h Storage IEC 721 3 1 class 1K 3 Temperatures 25 70 C Humidity 95 r h conformity EMC directive 89 336 EEC Immunity EN 50 082 1 EN 50 082 2 Emissions EN 50 081 1 EN 50 081 2 Low voltage directive 73 23 EEC Electrical safety EN 60 7...

Page 66: ... faults 33 info button 23 info display 58 L language 33 legionella function 48 dwelling time 57 effect on circulating pump 57 light building structures 42 limitation of rate of increase of flow temperature setpoint 56 M maximum d h w setpoint TBWmax 56 maximum forward shift for optimum start control 46 maximum forward shift for optimum stop control 46 maximum limitation of setpoint rise 60 maximum...

Page 67: ...ummer operation 32 switching differential of the room temperature 43 switching times 29 T technical data 66 time of day date and year 24 time switch program for space heating 28 type of building construction 42 W weather compensation 60 weather compensation with room influence 60 winter summertime 51 winter operation 32 ...

Page 68: ...ged 20 Setting lines 132 133 added Setting line 152 Function text changed 23 Info button line 3 changed 28 Description changed 29 Entry of individual days HC2 to TSP changed Chapter Switching times HC2 to TSP changed 31 Block Effect and standard values Changed to TSP 34 Title Maintenance indication changed to Boiler status code Table Boiler changed to maintenance lines Floor curing and modem added...

Page 69: ... QAA73 110 Room unit CE1P2284en Landis Staefa Division 06 06 2002 Siemens Building Technologies AG HVAC Products Gubelstrasse 22 CH 6301 Zug Tel 41 41 724 24 24 Fax 41 41 724 35 22 www landisstaefa com Siemens Building Technologies AG Subject to alteration ...

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