Baxi QAA73.110 Operator's manual

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

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Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en
HVAC Products Contents 19.06.2002
Contents
1 Summary........................................................................................................6
1.1 Features ..........................................................................................................6
1.2 Range of products...........................................................................................7
1.3 Field of use......................................................................................................7
1.4 Product liability ................................................................................................7
1.5 Environmental compatibility.............................................................................7
2 Handling.........................................................................................................8
2.1 Engineering .....................................................................................................8
2.2 Installation .......................................................................................................8
2.3 Electrical installation......................................................................................11
2.4 Operation.......................................................................................................12
2.5 Communication with boiler control.................................................................14
2.6 Parameter settings for the enduser...............................................................14
2.6.1 Overview of enduser parameters ..................................................................15
2.7 Parameter settings for the heating engineer .................................................16
2.7.1 Overview of heating engineer parameters.....................................................17
2.8 Parameter settings for the OEM....................................................................19
2.8.1 Overview of OEM parameters.......................................................................20
2.9 Commissioning..............................................................................................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 temperature (TRF)....................................26
3.9 Nominal d.h.w. temperature setpoint.............................................................27
Time switch programs TSP1 and TSP2 and d.h.w........................................28
3.10 Preselecting the
weekday..............................................................................28
3.11 Switching
times..............................................................................................29
Holidays.........................................................................................................30
3.12 Holiday setting...............................................................................................30
3.13 Heating circuit operating level during holidays..............................................30
General..........................................................................................................31
3.14 Standard times..............................................................................................31
3.15 Summer / winter changeover temperature....................................................32
3.16 Language.......................................................................................................33
3.17 Indication of
faults..........................................................................................33
3.18 Boiler status code..........................................................................................34
4 Description of the heating engineer settings ...........................................35
Service values...............................................................................................35

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4.1 Current room temperature setpoints..............................................................35
4.2 Attenuated outside temperature.....................................................................35
4.3 Composite outside temperature.....................................................................36
4.4 Actual value 2 of d.h.w. temperature .............................................................37
4.5 D.h.w.
flow rate..............................................................................................37
4.6 Actual boiler return temperature ....................................................................37
4.7 Actual value of the flue gas temperature .......................................................37
4.8 Actual value of solar collector temperature....................................................37
4.9 Actual value of solar storage tank temperature .............................................38
4.10 OpenTherm mode..........................................................................................38
4.11 Current flow temperature setpoint HC1 and HC2..........................................38
Space heating................................................................................................39
4.12 Heating curve
slope.......................................................................................39
4.13 Minimum and maximum limitation of flow temperature HC1 and HC2 ..........40
4.14 Parallel displacement of heating curve HC1/HC2..........................................41
4.15 Type of building construction.........................................................................42
4.16 Room influence..............................................................................................42
4.17 Switching differential of the room temperature ..............................................43
4.18 Adaption of the heating curve........................................................................44
4.19 Maximum forward shift for optimum start 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
5 Description of the OEM settings ................................................................53
Space heating OEM.......................................................................................53
5.1 Maximum setpoint (TRwMax) and minimum setpoint (TRwMin) of room
temperature....................................................................................................53
5.2 Gain factor of room influence (KORR)...........................................................53
5.3 Constant for quick setback (KON) .................................................................54
5.4 Boost of the room temperature setpoint (DTRSA).........................................55
5.5 Limitation of rate of increase of flow temperature setpoint ............................56
5.6 Measured value correction of room temperature...........................................56
D.h.w. OEM....................................................................................................56
5.7 Maximum d.h.w. setpoint (TBWmax).............................................................56
5.8 Setpoint of the legionella function..................................................................57
5.9 Dwelling time at legionella function setpoint..................................................57
5.10 Effect of legionella function on the circulating pump......................................57
Service functions OEM ..................................................................................58
5.11 Info display.....................................................................................................58
5.12 Frost warning.................................................................................................58
5.13 Operation.......................................................................................................59
5.14 Action occupancy button................................................................................59
5.15 Software
version............................................................................................59

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6 Functions .....................................................................................................60
6.1 Types of compensation .................................................................................60
6.1.1 Weather compensation..................................................................................60
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

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1 Summary
The QAA73.110 is a digital multi-functional room unit for one or 2 heating circuits and
d.h.w. control.
Boiler control delivers the outside temperature and other information to the QAA73.110
room unit via the OpenTherm communication interface. Based on the outside
temperature, the room temperature and a number of other parameters, the interface
calculates the required flow temperature setpoints for one or 2 heating circuits and
transmits them to the boiler control. In addition, the d.h.w. temperature setpoint is
transmitted to the boiler control.
The optimization functions offer energy savings without sacrificing comfort. The room
sensor required for that purpose is integrated in the unit.
1.1 Features
•Operating sections (operating levels) based on ergonomic and functional
considerations
•Clear assignment of basic functions:
−Operating mode, setpoint adjustment and occupancy button
−A number of actual values can be accessed via the Info button
−Additional functions can be programmed after opening the cover
−Special service level with protected access
•Every setting or change is displayed 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
•Programming lock (e.g. for child-proofing)
•Clear text display in a number of selectable languages
•Special mode for setting the parameters of Siemens boiler control systems
•Weather-compensated flow temperature control while giving consideration to the
building’s thermal dynamics
•Weather-compensated flow temperature control with room compensation
•Pure room temperature control
•Effect of room temperature deviation can be adjusted
•Optimum start / stop control
•ECO functions (24-hour limit switch, automatic summer / winter changeover)
•Room temperature switching differential for limiting the room temperature
•Adjustable maximum limitation of the flow temperature (especially in connection with
floor heating systems)
•Limitation of the rate of increase of the flow temperature setpoint
•Frost protection for the building, frost warning
•D.h.w. control with release and preselection of setpoint for the boiler controller
•Legionella function
•Integrated yearly clock with a reserve of at least 12 hours
Brief description
Operating functions
Functions