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

• Page 2: Table Of Contents

  3.16 Language………………….. 33 3.17 Indication of faults………………33 3.18 Boiler status code ………………34 Description of the heating engineer settings ……….. 35 Service values ………………..35 3/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Contents 19.06.2002…

• Page 3
  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 4/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284de HVAC Products Contents 19.06.2002…
• Page 4
  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 Dimensions ………………..65 Technical data………………..66 5/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Contents 19.06.2002…

• Page 5: Summary

  Summary Brief description 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…

• Page 13: Communication With Boiler Control

  In OpenTherm Plus mode, the QAA73.110 can read or write various standardized objects via the bus − In OpenTherm Lite mode, the QAA73.110 delivers only one 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 •…

• Page 15: Parameter Settings For The Heating Engineer

  Info button. display Note If no button is pressed for about 8 minutes, the room unit will automatically return to the Info level. 16/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 18: Parameter Settings For The Oem

  Info button. Note If no button is pressed for about 8 minutes, the room unit will automatically return to the Info level. 19/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 20: Operational Faults

  • Set the right time of day, the right date and the year on the room unit if the QAA73.110 is the clock master • Set the correct time of day and the date on the clock master (if present)

• Page 23: Time Of Day

  • If, on line 96, the clock master was programmed for external, manual time settings via lines 1 to 3 are no longer possible 24/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined.

• Page 29: Holidays

  When using the ”Reduced” setting, the reduced room temperature setpoint (TRRw) is maintained during the holidays; when using the ”Frost” setting, the frost protection setpoint of the room temperature (TRF) is maintained. 30/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 30: General

  15 or 25 – – : – – Switch-off time period 3 16 or 26 – – : – – – – : Inactive 31/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 31: Summer / Winter Changeover Temperature

  SuWi -1 °C Changeover between summer and winter operation: TAged Attenuated outside temperature SuWi Summer / winter changeover temperature Temperature Time in days Heating 32/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 32: Language

  Alarm boiler temperature (too high) Burn lockout Fault burner OpenTherm Missing partner unit on LPB General BMU fault Interlock Boiler control interlocked AirPressSwi Fault air pressure switch 33/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 33: Boiler Status Code

  Unit is in parameter setting mode Floor Unit performes floor curing function Modem Standby by external BMU contact Service non-Siemens boiler control required 34/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 34: Description Of The Heating Engineer Settings

  The attenuated outside temperature affects directly only summer / winter changeover. The attenuated outside temperature acts indirectly on flow temperature control via the composite outside temperature. 35/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 36: Actual Value 2 Of D.h.w. Temperature

  The current solar collector temperature is displayed. Line 59 Press the line selection buttons to select line 59. Display Unit –40 … +250 °C 37/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 37: Actual Value Of Solar Storage Tank Temperature

  • In OpenTherm Plus mode, the QAA73.110 can read or write various standardized objects via the bus • In OpenTherm Lite mode, the QAA73.110 delivers only one 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…

• Page 41: Type Of Building Construction

  The setting will activate the room influence on the required heating circuits. Entry: None Room influence inactive: The measured room temperature will not affect temperature control 42/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 42: Switching Differential Of The Room Temperature

  Switching differential will become greater • The pumps are switched on and off less often • The room temperature varies within a wider band 43/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 45: Maximum Forward Shift For Optimum Start Control

  The maximum forward shift for optimum stop control can be set between 0 and 360 minutes. Setting 0 means that optimum stop control is deactivated. 46/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined.

• Page 47: Release Of D.h.w. Heating

  • This function is possible only when d.h.w. heating is released by the d.h.w. heating program. 48/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 48: Operating Mode Selector

  If the parameter values shall not be changed, entry can be locked. Line 95 Press the line selection buttons to select line 95. Press the + / – buttons to activate or deactivate programming. 49/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 50: Clock Time Master

  4.27 Clock time master The clock time of the QAA73.110 and the clock time of the connected boiler control can Description be synchronized. In that case, one of the units will be defined as the clock time master, and the other unit adopts the time of day from the master.

• Page 51: Summer- / Wintertime Changeover

  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. 52/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 52: Description Of The Oem Settings

  TRwk = 20 °C + 4 (20 °C – 22 °C) = 12 °C KORR Constant for room influence Actual value of the room temperature Room temperature setpoint TRwk Room temperature setpoint (readjusted) 53/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 55: Limitation Of Rate Of Increase Of Flow Temperature Setpoint

  Press the + / – buttons to adjust the maximum setpoint of the d.h.w. temperature. Setting range Unit Factory setting TBWw…80 °C TBWw Nominal d.h.w. temperature setpoint 56/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 56: Setpoint Of The Legionella Function

  If this function is deactivated, there is a risk that legionella viruses will return from the Important circulation piping to the d.h.w. storage tank right after the storage tank has been thermally desinfected. 57/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 57: Service Functions Oem

  If the outside temperature falls to the selected temperature level or drops below it, the Info display shows the actual outside temperature as a flashing value. 58/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined.

• Page 58: Operation

  The software version will automatically be displayed on this line. Example: 01.0 The first 2 digits give the software version The third digit gives the software revision (01.0) 59/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 59: Functions

  Weather compensation with room influence − Room compensation If no outside sensor is connected and the room sensor of the QAA73.110 fails, a fault Note status signal will be delivered. In that case, the room unit will change to emergency operation ”with no sensor”…

• Page 65: Technical Data

  0..00.45 °C Room sensor Other features Backup of time switch min. 12 h Software class A to EN 60 730 Weight approx. 0.17 kg 66/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Error! Style not defined. 19.06.2002…

• Page 66
  …………..58 software version …………59 standard times…………31 language …………..33 summer / winter changeover temperature ….32 legionella function …………. 48 summer- / wintertime……….52 dwelling time…………57 67/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Index 06.06.2002…
• Page 67
  ….. 60 technical data …………66 winter- / summertime ……….51 time of day, date and year………24 winter operation …………32 time switch program for space heating……28 68/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products Index 06.06.2002…
• Page 68
  Chapter «Operating lock for programming » changed Chapter «Dwlling time of legionella funkcion» and «Effect of legionella funkcion on circulating pump» added Section «Operating lock» added Panel thickness changed 69/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en HVAC Products 06.06.2002…
• Page 69
  © Siemens Building Technologies AG HVAC Products Subject to alteration Gubelstrasse 22 CH -6301 Zug Tel. +41 41-724 24 24 Fax +41 41-724 35 22 www.landisstaefa.com 70/70 Siemens Building Technologies Basic Documentation QAA73.110 Room unit CE1P2284en Landis & Staefa Division 06.06.2002…

• Page 1
  CONTROL QAA73 QAA73 INSTRUCTIONS FOR THE SERVICEMAN Installing, using and programming the QAA73 remote control Programming boilers Optima CB ed SB with QAA73 Application examples of a hydraulic installation Application examples of a hydraulic installation with additional zones Application examples of cascade systems…

• Page 2: Table Of Contents

  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions CONTENTS: 1 General description of the remote control pag. 3 OPTIMA connection wiring diagram pag. 26 ….

• Page 3: General Description Of The Remote Control

  Service instructions Service instructions GENERAL DESCRIPTION OF THE REMOTE CONTROL QAA73 is a high tech remote control built in complian- ce with standards , with a weekly timer feature (with annual date setting), boiler operation and pro- gramming control functions, zone detector, alarm si- gnalling and advanced diagnosis.

• Page 4: Technical Characteristics

  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions TECHNICAL CHARACTERISTICS — Remove the plinth from the front of the appliance as illustrated in figure 4-2 Auto — Secure the plinth to the wall using screws and the holes made on the same (fig.

• Page 5: Description Of The Controls

  11 (User parameters). PROGRAMMING THE DOMESTIC HOT WATER (D.H.W.) PRODUCTION PERIOD By modifying the parameters of the remote control QAA73, fig. 6-1 you can choose the type of D.H.W. production period pro- A — Current operating mode (horizontal black bars) gramming;…

• Page 6: Room Temperature Adjustmen

  QAA73 controls two circuits (HC1 and HC2, for example), the — Activate the D.H.W. production by pressing button 3 (a ho- value will be applied to both circuits.

• Page 7: Comfort/Economy Mode Selector Button

  8 minutes of inactivity. * — Absolute minimum and maximum temperature recorded on activation of the remote control QAA73; to reset the recording, press buttons +/- at the same time for 3 se- conds.

• Page 8: User Programming

  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 11 USER PROGRAMMING Push-button Indication Line Below is the generalised sequence of use of the buttons to modify Press the adjustment but- the parameters reserved for the user. tons to set the desired va- lue;…

• Page 9: Details Of The User Parameters

  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 11.2 DETAILS OF USER PARAMETERS LINE 15: the adjustment buttons (+) or (-) allow you to LINE 1: the adjustment buttons (+) or (-) allow you to set the starting time of the third heating period set the correct time: by keeping the buttons of the day or period selected in line 10: by kee- pressed, the minutes change quickly.

• Page 10
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions Once the set holiday period is over, the normal weekly pro- T (°C) TAged gramming will be restored. The dates indicating the beginning and the end of the holi- day are automatically reset when the holiday is over.

• Page 11: Installer Programming

  … with / without ECO GENERAL Operation blockage … OFF / ON Reference clock (master) QAA73 QAA73 QAA73/External Date of time change, from summer time to standard time (+1h) 25 mar 25 mar 01jan…31dec Date of time change, from summer time to standard time…

• Page 12
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 12.2 DETAILS OF INSTALLER PARAMETERS LINE 54: The mixed external temperature is the LINE 51: Reading of the value set for the current hea- combination of the actual external tempe- ting mode which is active in circuit 1 rature and the corrected external tempera- (comfort, economy or anti-frost protection).
• Page 13
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions LINE 70: the adjustment buttons (+) or (-) allow you tually influences the position of the set- to set the slope of the heating curve for the tings on the knob. heating circuit;…
• Page 14
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions Decrease = The commutation diffe- LINE 75: Influence of the room temperature, i.e. the rential takes on a lower shifts in values between the actual room value; the circulation pum- temperature and the reference room tem- ps are activated and perature are measured and taken into ac-…
• Page 15
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions LINE 77: The self-adjustment function takes into ac- The correction of the slope is balanced, count the different heating situations and within this range of temperatures, by the adapts the adjustment to the heating cir- factor f2 and the sensitivity to adjustment 2.
• Page 16
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions LINE 80: As for line 70, but for heating circuit 2 ACCORDING TO THE HEATING PROGRAMME LINE 81: As for line 71, but for heating circuit 2 LINE 82: As for line 72, but for heating circuit 2 LINE 83: As for line 73, but for heating circuit 2 LINE 90: Defines the minimum temperature limit va- lue at which the D.H.W.
• Page 17
  D.H.W. production deactivated. LINE 96: Determines the appliance to which the sy- stem refers in terms of the correct time. QAA73 = remote control QAA 73 Esterno= another appliance LINE 97 This function allows you to change the ti- me on the clock automatically, from stan- dard time to summer time.

• Page 18: Serviceman Programming

  … Frost warning (-.- = disabled) 3,0°C -10…+10 … Control (or reference value) knob free blocked/free … Effect of the COMFORT/ECONOMY mode commutation button onHC1+HC2 on HC1+HC2 … or on HC1 Remote control QAA73 software version 0…99.9 – 18 –…

• Page 19
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 13.2 DETAILS OF SERVICEMAN PARAMETERS LINE 100: Limits the maximum room temperature re- LINE 103: The accelerated drop constant takes advantage ference value (or reference room tempera- of the heat accumulation capacity of a building and modifies the duration of the rapid temperatu- ture).
• Page 20
  — Possibility to limit this setting for the end user. — Drop in the risk of scalding — Drop in the risk of limescale build-up Note: a D.H.W. reference temperature of a BMU, transmitted via OpenTherm, has prio- rity and replaces that of QAA73 regulator. – 20 –…
• Page 21
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions FUNCTIONS WITHOUT PARAMETERS REGULATION ACCORDING TO THE EXTER- NAL CONDITIONS AND WITH THE INFLUEN- CE OF THE ROOM TEMPERATURE The functions described below need to adjustments. They are carried out automatically and act on the sy- stem without any preliminary settings.
• Page 22
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions AUTOMATIC DAILY HEATING LIMITS PRO- AUTOMATIC HEATING LIMITS PROCESS WITH CESS THE INFLUENCE OF THE ROOM TEMPERA- TURE This is an economy function with a rapid effect. It in- This function acts on the basis of the current reference terrupts the heating process as soon as there is no room temperature.
• Page 23
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions ACCELERATED DOMESTIC HOT WATER FIL- ACCELERATED DROP OF THE COMFORT LING (D.H.W.) MODE WITH THE INFLUENCE OF THE ROOM TEMPERATURE In systems with a D.H.W. indirect cylinder, the availa- bility of domestic hot water is also ensured outside After the commutation on a lower reference room periods of occupation.
• Page 24
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions ANTI-FROST PROTECTION The anti-frost protection functions prevent too big a drop in the temperatures of the system and in the room temperature and also protect the central heating system and the premises or rooms against the risk of any frost.

• Page 25: Access To The Boiler

  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 14 ACCESS TO THE BOILER CONTROL To access the internal components of the boiler, pro- PANEL ceed as follows: — unplug the appliance BOILER — pull open the flap — remove the top screws A on the front panel — lift the panel slightly and pull it gently towards you.

• Page 26
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 15 BOILER CONNECTION WIRING DIAGRAM – 26 –…
• Page 27
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions – 27 –…
• Page 28
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions – 28 –…
• Page 29
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions – 29 –…
• Page 30
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions – 30 –…
• Page 31
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions – 31 –…

• Page 32: Remote Control

  43 ….CONTROLLING TWO ZONES WITH QAA73 pag. 37 ….

• Page 33: Temperatures

  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 18.1 A ZONE WITH A FIXED TEMPERATURE, WITH A ROOM THERMOSTAT, WITHOUT EXTERNAL SENSOR Plant code: n° 06 (CB mod.) n° 03 (SB mod.) BOILER SCHEDA CALDAIA BOARD X10-06 X10-05 X10-04…

• Page 34
  75 — room temperature regulation ON HC1 The boiler Tset depends on both parameters 71, 72, on the reference room temperature set on the QAA73 remote control knob and on the ∆t between the flow and return temperatures. The maximum temperature is limited by TKSnorm.
• Page 35
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 18.3 A ZONE WITH ADJUSTABLE TEMPERATURE, WITH A ROOM THERMOSTAT, WITH EXTERNAL SENSOR Plant code: n° 06 (CB mod.) n° 03 (SB mod.) BOILER SCHEDA CALDAIA BOARD X10-06 X10-05 X10-04 X10-03…
• Page 36
  The boiler Tset depends on both the external temperature, on parameters 70, 71, 72, 73, on thel ∆t between the flow and re- turn temperatures and on the reference room temperature set on the QAA73 remote control knob. – 36 –…
• Page 37
  Tset set on the QAA73 remote control knob. The variation in the temperature of the room Tset, using the QAA73 remote control knob modifies the flow temperature of the two central heating circuits HC1 and HC2.
• Page 38
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 18.5 CONTROLLING TWO ZONES, ONE OF WHICH IS MIXED AND THE OTHER DIRECT WITH A FIXED POINT, WITH ROOM THERMOSTATS, WITH OPTIONAL CLIP-IN, WITHOUT EXTERNAL SENSOR Plant code: n°…
• Page 39
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 18.6 CONTROLLING TWO ZONES, ONE OF WHICH IS MIXED AND THE OTHER DIRECT WITH ADJUSTABLE TEMPE- RATURE, WITH ROOM THERMOSTATS, WITH OPTIONAL CLIP-IN, WITH EXTERNAL SENSOR Plant code: n°…
• Page 40
  80 — heating curve HC2 slope ––.– The Tset value of the direct zone depends on the 71 and 72 parameter setting and the reference room temperature set by using the QAA73 remote control knob. The Tset value of the mixed zone depends on the TVSmin and TVSmax parameter settings.
• Page 41
  Allocation of the QAA73 hydraulic circuit KonfigHKS — Adjust to a value higher than or equal to the parameter set on line 46 of the QAA73 remote control See paragraph entitled “Using a room thermostat in one of the two circuits” on page 37…
• Page 42
  HydrSystem 54 (mod. CB) 54 (mod. CB) 51 (mod. SB) 51 (mod. SB) Allocation of the QAA73 hydraulic circuit KonfigHKS See paragraph entitled “Using a room thermostat in one of the two circuits” on page 37 QAA 73 MPOSTAZIONE PARAMETRI…
• Page 43
  Allocation of the QAA73 hydraulic circuit KonfigHKS — Adjust to a value higher than or equal to the parameter set on line 46 of the QAA73 remote control See paragraph entitled “Using a room thermostat in one of the two circuits” on page 37…
• Page 44
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 18.11 CONTROLLING TWO ZONES WITH ROOM THERMOSTATS, WITH OPTIONAL CLIP-IN, WITHOUT EX- TERNAL SENSOR Plant code: n° 38 (CB mod.) n° 35 (SB mod.) BOILER SCHEDA CALDAIA BOARD circuit 2 circuit 1 Circuito 2…
• Page 45
  OPTIMA CB — SB OPTIMA CB — SB Service instructions Service instructions 18.12 CONTROLLING TWO ZONES WITH REMOTE ROOM THERMOSTATS, WITH OPTIONAL CLIP-IN, WITH EXTERNAL SENSOR Plant code: n° 38 (CB mod.) n° 35 (SB mod.) BOILER SCHEDA CALDAIA BOARD circuit 2 circuit 1 Circuito 2…
• Page 46
  HydrSystem 38 (CB mod.) 38 (CB mod.) 35 (SB mod.) 35 (SB mod.) Allocation of the QAA73 hydraulic circuit KonfigHKS See paragraph entitled “Using a room thermostat in one of the two circuits” on page 37 QAA73 PARAMETERS VALUE ≥ 2,5 70 — heating curve HC1 slope 71 — Minimum flow temp.
• Page 47
  Allocation of the QAA73 hydraulic circuit KonfigHKS — Adjust to a value higher than or equal to the parameter set on line 46 of the QAA73 remote control See paragraph entitled “Using a room thermostat in one of the two circuits” on page 37…
• Page 48
  TRIANCO Thorncliffe, Chapeltown, Sheffield S35 2PZ Tel: Sheffield (0114) 257 2300 Fax: (0114) 257 1419 www.trianco.co.uk LB 1309t • 21/12/2003…