Riello TAU 35 UNIT User manual

cod. 20103686 rev. 2 05/16
TAU 35 UNIT
EN USER MANUAL

2
The following symbols are used in this manual:
9 = Identies actions that require caution and
adequatepreparation
0 = IdentiesactionsthatyouMUSTNOTdo
Thismanual,Code20103686Rev.2(05/16)ismadeupof
20pages.
CONTENTS
GENERAL ................................... 4
Precautions .......................................4
General safety information ...........................4
USER ...................................... 5
Controlpanel......................................5
Programming levels .................................8
Information levels ..................................8
Preparingforinitialstart-up ..........................11
Initialstart-up.....................................11
Temporaryshutdown............................... 13
Preparingforextendedperiodsofdisuse ............... 13
Errorcodes ...................................... 14
Completelistofparameters ..........................17
Cleaning ........................................ 18
Maintenance ..................................... 18

3
Dear heating engineer,
CongratulationsonhavingchosenaRboiler.Youhaveselectedamodern,qualityproductthatisdesignedtogive
dependable,efcientandsafeserviceandtoprovidecomfortinthehomeformanyyearstocome.Thismanualpro-
videsinformationthatisessentialtotheinstallationoftheappliance.Usedinconjunctionwithyourownknowledge
andexpertiseitwillenableyoutoinstalltheappliancequickly,easily,andcorrectly.
Onceagain,pleaseacceptourthanksandourcongratulationsonyourchoiceofproduct.
RielloS.p.A.

4
GENERAL
1.2 General safety information
0 Donotallowchildrenorin-
rm persons to operate
theboilerunsupervised.
0 Do not operate any
electrical devices or
equipment, including
switches or domestic ap-
pliances, etc., if you can
smell fuel or fumes. If you de-
tectanysuspicioussmells:
−Ventilate the room by opening all doors and
windows;
−Closethefuelshut-offcock;
−ReportthefaultimmediatelytotheRTechni-
calAssistanceServiceoraprofessionallyquali-
edheatingengineer.
0 Never clean or service theboilerwithout rst di-
sconnectingitfromthemainselectricitysupplyby
turningthemainpowerswitchOFF.
0 Neverpull,disconnect,ortwisttheelectricalcables
coming from the boiler even if it is disconnected
fromthemainselectricitysupply.
0 Do no obstruct or restrict the vents in the room
wheretheapplianceisinstalled.Adequateventi-
lationisessentialforcorrectcombustion.
0 Do not leave ammable sub-
stances or containers in the
room where the boiler is
installed.
0 Do not touch the boiler
when barefoot or wet.
0 Do not switch the boiler
off if outside temperature
dropsbelowZERO(riskoffre-
ezing).
9 This instruction manual and that for the installer
andTechnicalAssistanceServiceareintegralparts
of the boiler. They must be kept safe and must
ALWAYS accompany theboiler,evenif itissoldto
another owner or user or transferred to another in-
stallation. If you damage or lose this manual, order
a replacement immediately from your local R
TechnicalAssistanceCentre.
9 Thissystemmustbeinstalledbyalegallyqualied
heatingengineer(inItaly,thelawregulatingpro-
fessional heating engineers is Law 46 of the 5th
March 1990). On completion of
the installation, the installer
must issue the owner with
adeclaration of conformity
conrmingthattheinstal-
lationhasbeencompleted
to the highest standards
incompliancewiththein-
structions provided by R
in this instruction manual,
and that it conforms to all ap-
plicablelawsandstandards.
9 Ifyounoticeanywaterleakingfromtheboiler,di-
sconnectitimmediatelyfromthemainselectricity
supply,shutoffthewatersupply,andnotifyyour
localRTechnicalAssistanceCentreoraqualied
heating engineer immediately.
9 Periodicallycheckthatoperating
pressureinthewatercircuitis
over 1 bar. If water pressure
is consistently low, contact
R's Technical Assistance
Service or a professionally
qualiedheatingengineer.
9 If the boiler is not going to be
usedforanextendedperiodof
time,proceedasfollowstoprepa-
reitforshut-down:
−TurnthemainpowerswitchOFF
−Close the boiler's fuel cock and heating circuit
watercock
−Drain the central heating circuit if there is any
riskoffreezing.
9 Theboilermustonlybeusedforthepurposespeci-
edbyRandforwhichitisdesigned.Thema-
nufacturer declines all responsibility, contractual
orother,fordamagetopropertyorinjurytoper-
sons or animals caused by improper installation,
adjustment,maintenanceoruse.
Theoperationofanyappliancethatuseselectricalpowerdemandsthatanumberoffundamentalsafetyprecautions
berespected.
1 GENERAL
1.1 Precautions

5
USER
1 2 4 7 11 12 13 15143 5 8 9 106
1 Burnerlockoutindicator
2 DHWmodeselector(forusewithremotestoragecylinder:accessory)
3 Centralheatingorroomtemperaturesettingkey
4 DHWtemperaturesettingkey
 (forusewithremotestoragecylinder:accessory)
5 Resetkey.
 Restoresnormalfunctioningafterasafetyshutdown.
6 Chimneysweepmodeselection.
Pressandholdkeys3and4(forbetween3and6seconds)toenterchimneysweepmode.
7 Parameterselectionkeys
8 Parameterselectionkeys
9 Valuedecrement/incrementkeys
10 Valuedecrement/incrementkeys
11 Infokey
12 Display
13 Functioningmodeselectionbutton.
Alineappearsunderthesymbols:
s Automatic:theboilerfunctionsaccordingtothesetprogram
o Daytime:theboileroperatesatdaytime(comfort)setpoint
l Night-time:theboileroperatesatnight-time(reduced)setpoint
b Stand-by
14 Housingforcontroller(accessory)
15 Mainswitch
2 USER
2.1 Controlpanel
CONTROL PANEL AND SYMBOLS

6
USER
DISPLAY
A B H
D
C
FG E
A Water pressure reading (not used)
B Large numeric display
Displays current value.
C Chimney sweep or Service Required symbol
D Display symbols:
vDHW temperature or DHW mode active
rCH or room temperature setpoint, or CH mode active
cOutdoor temperature
oDaytime CH mode
lNight-time CH mode
fFlame detected
nError
E Small numeric display
Displays time, parameters and error codes
F Central heating modes:
sAutomatic: the boiler functions according to the set program
oDaytime: the boiler operates at daytime (comfort) setpoint
lNight-time: the boiler operates at night-time (reduced) setpoint
bStand-by
G DHW mode: ON or OFF
H Current time display

7
USER
F1 E1 H1
A1 FC1 D1B1
G1 I1
L1
A1 Functioningmode.
Press the Mkeytoactivatethevariousmodes,asshownbythelineunderthe
 correspondingsymbol.
B1 DHW mode.
Press the VkeytoactivateanddeactivateDHWmode.
C1 Daytime CH mode
D1 Time of day
E1 Currentboilertemperature
F1 Waterpressure(notused)
G1 Flamedetected
H1 Current time bar
I1 CHmodeactive
L1 DHWmodeactive
MAIN SCREEN
Notesonfunctioning
ThecontrolpanelontheTAU UNITboilercontrolsthefollowingfunctions:
−TheDHWpriorityfunction. This ensures that the
boiler can still serve the central heating circuit
evenwhendomestichotwaterisdrawnoff.
−Thefrostprotectionfunction.
 Thisstopswaterfreezinginsidetheboiler.If
boilertemperaturefallsbelow5°C,theburner
ignitesandrunsatfullpoweruntiltemperature
reaches10°C.
 Thefrostprotectionfunctionisonlyactiveif
anoutdoortemperaturesensorisconnected.
Ifoutsidetemperaturedropsbelow-5°Cthe
pumpsareswitchedon.Ifoutsidetemperature
isbetween-4°and1.5°C,thepumpsare
switchedonfor10minutesatintervalsof6
hours.Ifoutsidetemperatureisabove1.5°Cthe
pumpsareswitchedoff.
−Overtemperaturedispersalfunction. If the tem-
perature threshold thermostat trips (86°C) the
boilershutsdownandaccumulatedheatisdi-
spersed by switching on the central heating
pump.Ifboilertemperaturerisesto89°C,thefan
isswitchedontoo.
−The cascade control function. The addition of a
controller (accessory) allows you to connect a
numberofboilersincascade,sharingheatou-
tputbetweenanumberofburnersandimpro-
vingoverallsystemefciency.
−Boiler switching differential. This establishes a
minimumofftimefortheburner,tostopitigni-
ting and shutting down repeatedly. The boiler
willonlystartupagainifthedifferencebetween
the setpoint and the actual boiler temperature
exceedsapredeterminedvalue.

8
USER
2.2 Programming levels
Therearethreeprogramminglevels:
−End user
−Installer
−Manufacturer.
Youmustfollowaprecisesetofinstructionstoaccessanyoftheselevels.Therelevantinstructions,completewitha
listofthekeystopress,areprovidedinthetablesbelow.
END USER LEVEL
Thislevelprovidestheparametersneededbytheenduser.Forexample,itcontainsparametersforsettingCHandDHW
functioningtimesandSummer/Wintermodeswitchingtemperature.
Seethe“Completelistofparameters”sectionforfurtherdetails.
Key Explanation
1 DU  PressoneofthesekeystoaccesstheENDUSERprogramminglevel
2DU  Pressoneofthesekeysuntilyoureachtheparameteryourequire:theexamplehere 
   showstheparameterPxx
3+-  Pressthesekeystochangethecurrentvalue.
To memorise the new value, you need to move on to another parameter.
4
M V  Pressoneofthesekeystoexittheenduserprogramminglevel.
Any new settings are not stored in memory.
5
I Pressthiskeytoexittheenduserprogramminglevel.Anynewsettingsarestoredinmemory.
Note1: Ifnokeyispressedforabout8minutes,thedisplayautomaticallyreturnstothemainscreen.Anynew
settings made will not be saved.
Note2: anychangesaresavedifyouswitchtoanotherprogramminglevel
2.3 Information levels
BASIC INFORMATION LEVEL
Press the Ikeytoenterthebasicinformationlevel.PresstheIkeyagaintoscrollthroughthevalues
listed below.
Key Explanation
1 v  DHWtemperature
2 t   Waterpressure(notused)
t
t
t
3 X.   Functioningphase(seetable1)
4 c  Outdoortemperature
5 Ex   (Accessory)controllererrorcodes(seethe“Errorcodes”section)
6 r  Boilertemperature
7 MV Pressoneofthesekeystoreturntothemainscreen

9
USER
Functioning phases (table 1)
Displayed Description
00 Standby
 01 Ignitionprevented
 02 Fanstart
 03 Pre-ventilation
04 Wait time
 05 Pre-ignitiontime
 06 Safetytime,constant
07 Safety time, variable
10 Central heating mode
 11 Domestichotwatermode
12 Simultaneous CH and DHW mode
 20 Post-ventilationwithlastcontrolused
 21 Post-ventilationatpre-ventilationlevel
22 Home run (*)
 99 Burnerlockout(errorcodedisplayed)
(*) Home run = Boiler status after reset.
EXTENDED INFORMATION LEVEL 1: temperatures
Press the Ikey .
Press and hold both DUkeysforatleast3seconds.
Press one of the +-keysuntilyoureachtherequiredparameter.
Temperature
Nr Description
 b0 Controlboarderrorcode
 b1 Boilerreturntemperature
b 2 Not used
 b3 Fluegastemperature
 b4 Outdoortemperature
 b5 Compoundoutdoortemperature
 b6 Attenuatedoutdoortemperature
b 7 Not used
b 8 Reserved
 b9 Reserved

10
USER
EXTENDED INFORMATION LEVEL 2: process values
Press the Ikey.
Press and hold both DUkeysforatleast3seconds.
Press the Ukey.
Press one of the +-keysuntilyoureachtheparameteryourequire.
Process values
Nr Description
C 0 Reserved
 C1 Ionisationcurrent
 C2 Fanspeed
 C3 Fancontrolcurrent(PWM)
 C4 Relativeboilerheatoutput
 C5 Pumpsetpoint
 C6 Differentialcontrol
C 7 Reserved
C 8 Reserved
 C9 Reserved
EXTENDED INFORMATION LEVEL 3: assistance
Press the Ikey.
Press and hold both DUkeysforatleast3seconds.
Press the Ukeytwice.
Press one of the +-keysuntilyoureachtheparameteryourequire.
Assistance
Nr Description
d 0 Reserved
 d1 Twostageormodulatingcontrolsetpoint(PID)
 d2 Currentboilersetpoint
 d3 Roomtemperaturesetpoint
 d4 DHWsetpoint
 d5 Maximummodulationincentralheatingmode
 d6 Maximumfanspeedatmaximumcentralheatingpower
d 7 Reserved
d 8 Reserved
 d9 Reserved

11
USER
Itisessentialtoperformthefollowingchecksbeforestartinguportestingthefunctioningoftheboiler.
−Checkthatthewaterandfuelshut-offcocksare
open.
−Check that the water pressure gauge shows a
pressureover 1barwiththesystemcold.Check
alsothatthewatercircuitisproperlyde-aerated.
−Checkthattheexpansionvesseliscorrectlypre-
charged.
−Checkthattheelectricalconnectionshavebeen
madecorrectly.
−Check that the vent and air intake pipes have
beencorrectlyinstalledandconnected.
9 IfyouneedtoconverttheboilerfromMETHANEto
LPG,contactr’sTechnicalAssistanceService.
−Switch the electricity supply ON at the system’s
mainswitchandatthecontrolpanel.
−Theboilerswitchesonandthedisplayshowsthe
softwareversionofthemaincontrolboard.
−The display shows the system status and the
temperaturemeasuredbytheboilertemperatu-
re sensor.
2.4 Preparingforinitialstart-up
2.5 Initialstart-up

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−Settheroomthermostattothedesiredtempe-
rature(20°C).
−Press the Tkey:
−If an outdoor temperature sensor is con-
nected,settheroomtemperaturesetpoint
−If no outdoor temperature sensor is con-
nected,setthecentralheatingcircuittempe-
raturesetpoint.
Press the + -keystoadjustthesetpoint
Pressanyofthekeystoexit:RTMV.
The new setting is stored in memory.
Ifaremotestoragecylinder(accessory)ispresent,con-
nect the storage cylinder temperature sensor to the
controlpanelandsetthemanufacturerlevelparameter
“558b2”=0(seethe“Manufacturerlevel”section):
−Press the Rkey
Press the + -keystoadjustthesetpoint.
Pressanyofthekeystoexit:
R T M V .
The new setting is stored in memory.
Iftheremotestoragecylinderhasitsownthermostat,
leavethemanufacturerlevelparameter“558b2”=1(see
the“Manufacturerlevel”section).
−Ifanoutdoortemperaturesensorisinstalled,set
installerparameter“532Heatingcurveslopehe-
atingcircuit1”asinstructedinthesection“Set-
tingfunctioningparameters”.
Ifanyboilerignitionorfunctioningerrorsaredetected,
thedisplayshowsthetypeoferror.
Errorscanbeoftwotypes:
−PERMANENT errors are those that can only be
cancelledbypressingtheSkey.
−TRANSIENTerrorsarethosethatareautomatically
cancelled as soon as the cause is rectied (see
“Errorcodes”onpage16).

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Ifyouaregoingtobeawayforashortperiodoftimelike
aweekendorashortholiday,etc.proceedasfollows:
−Press and hold the Mkeyuntilthebar(1)appe-
ars under"Stand-by"mode.
Providedpowerto theboilerremains switchedon,as
shownbythe green LED, and thefuel supplyremains
open,theboilerremainsprotectedbythefrostprotec-
tionfunction.
Boilerfrostprotection:Ifboilertemperaturefallsbelow
5°C,theburnerignitesandrunsatfullpoweruntiltem-
peraturereaches10°C.
CHfrostprotection:Thisfunctionisonlyactiveifanout-
sidetemperature sensorisconnected.Ifoutsidetem-
peraturedropsbelow-5°Cthepumpsareswitchedon.
If outside temperature is between -4° and 1.5°C, the
pumpsareswitchedonfor10minutesatintervalsof6
hours.Ifoutsidetemperatureisabove1.5°Cthepumps
areswitchedoff.
Iftheboilerisnotgoingtobeusedforanextendedpe-
riodoftime,proceedasfollowstoprepareitforshut-
down.
−Turn the control panel power switch OFF and
makesurethatthedisplaygoesout
−Turnthesystem’smainspowerswitchOFF
−Closethefuelshut-offcockandthecentralhea-
tingandDHWcircuitshut-offcocks.
9 Under these conditions the system is not pro-
tected against frost. Drain the central heating cir-
cuit and domestic hot water circuit if there is any
risk of freezing.
2.6 Temporaryshutdown
2.7 Preparingforextendedperiodsofdisuse

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TEMPORARY ERROR DISPLAY
2.8 Errorcodes
−Ifatemporaryerroroccurs,thedisplayalterna-
tesbetweendisplayingthetimedisplayandthe
errorcode.
−Press the I key to displaytheerror codeon
themaindisplay.
−Press and hold the Uand Dkeyssimulta-
neouslyfor3seconds.Theinternalerrorcodeis
displayed.
−Press the Ikeytoaccesstheinformationle-
vel.
−Press the Vor Mkeytoreturntothemain
screen.

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PERMANENT ERROR DISPLAY
−If a permanent error occurs, the error code
ashesonthemaindisplay.Thecontrollerper-
formsasafetyshutdown.Example:E154.
−Press the I key to displaytheerror codeon
themaindisplay.
−Press and hold the U and Dkeyssimulta-
neouslyfor3seconds.
 Theinternalerrorcodeisdisplayed.Example:
435.
−Press the Ikeytoaccesstheinformationle-
vel.
−Press the Vor Mkeytoreturntothemain
screen.
Note:Onceyouhaveeliminatedthecauseoftheerror,
pressSto reset the boiler.

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ERROR TABLE
Error Type Description
0Noinputcode
10 Outdoortemperaturesensorerror
20 Boiler sensor 1 error
28 Fluegassensorerror
32 CHowsensor2error
40 CH return sensor 1 error
50 DHW1temperaturesensorerror
52 DHW 2 sensor error
61 Room unit 1 error
62 Roomunit1ortimerconnectionerror
73 Solarcollectorsensorerror(ifsolarclip-inoptionisinstalled-accessory)
77 Airpressureswitcherror
78 Waterpressureswitcherror
81 LPBcommunicationerror
82 LPB address error
91 EEPROMdataloss
92 Electronicdeviceerrors
95 Invalid date
100 Twomasterclocksfound
105 Maintenancemessage
110 Permanent Safetythermostattripped(SLT)
111 Safety shutdown Thresholdthermostattripped
113 Permanent Fluegasthermostattripped
117 Waterpressuretoohigh
118 Waterpressuretoolow
119 Permanent Fluegasthermostattripped
128 Noameduringfunctioning
129 Comburent air system error
130 Safety shutdown Fluegastemperaturethresholdexceeded
132 Safety shutdown Gasfeedpressureswitch(GPS)tripped(notused)
133 Noame
140 Illegal LPB address
148 Interface/baseunitLPBincompatibility
151 Internalcontrolboarderror
152 Parameter setting error
153 Lockoutcausedbyunit
154 Genericerror
160 Fanspeedthresholdnotreached
161 Maximumfanspeedexceeded
162 Airpressureswitchcontactsnotclosed
164 Waterpressureswitch/CHcircuitowswitcherror
166 Airpressureswitchdoesnotopen
180 Chimneysweepfunctionactive
181 Servicerequestfunctionactive
183 Controlboardinparametersettingmode
184 Modemfunctionactive
185 Floorcuringfunctionactive

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2.9 Completelistofparameters
LIST OF END USER LEVEL PARAMETERS
N° Description Range U/M Default
www
1Time of day 0…23.59 h/min ---
Setpoints
5 (*) Line 5 will be hidden when using an additional room unit:
Reducedroomtemperaturesetpoint 10…30 °C 20
Reducedboilertemperaturesetpoint 30...boilertemperaturesetpoint
CH circuit 1 program
11 Switch-ontime1stphase 00:00…24:00 hh:mm 06:00
12 Switch-offtime1stphase 00:00…24:00 hh:mm 22:00
13 Switch-ontime2ndphase 00:00…24:00 hh:mm 24:00
14 Switch-offtime2ndphase 00:00…24:00 hh:mm 24:00
15 Switch-ontime3rdphase 00:00…24:00 hh:mm 24:00
16 Switch-offtime3rdphase 00:00…24:00 hh:mm 24:00
DHW program (only used in conjunction with a storage cylinder)
31 TimeprogramDHW,1stphaseon 00:00…24:00 hh:mm 06:00
32 TimeprogramDHW,1stphaseoff 00:00…24:00 hh:mm 22:00
33 TimeprogramDHW,2ndphaseon 00:00…24:00 hh:mm 24:00
34 TimeprogramDHW,2ndphaseoff 00:00…24:00 hh:mm 24:00
35 TimeprogramDHW,3rdphaseon 00:00…24:00 hh:mm 24:00
36 TimeprogramDHW,3rdphaseoff 00:00…24:00 hh:mm 24:00
45 StandardtimeprogramsforHCandDHW No/Yes --- No
(presssimultaneouslybuttons -and +for3seconds)
516 Summer/winterchangeovertemperature 8…30 °C 20
(30=changeoverdeactivated)
520 PARAMETERFIXEDINTHISMODEL
DONOTCHANGESETTING 10
629 Endusercanacknowledgeapendingmaintenancealarmviathis
parameter
(0 / 1 = disabled/ena-
bled) 0
726 Maintenancecodecontainsenumerationvalueofmaintenance
alarm(exactcause) 0…255 0
(*) Outdoortemperaturesensorconnected:settheroomtemperaturereducedsetpoint.
 Outdoortemperaturesensornotconnected:settheboilertemperaturereducedsetpoint.

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2.10 Cleaning
2.11 Maintenance
Useaclothdampedinsoapywatertocleantheboiler's
externalcasing.Toremovestubbornmarks,useacloth
dampedina50%mixofwateranddenaturedalcohol
orasuitablecleaningproduct.
Wipetheboilerdryaftercleaningit.
9 Removetheprotectivelm(F)fromthefrontpanel
andcontrolpanelbeforeyoustartcleaningtheboi-
ler'scasingpanels.
9 Thecombustionchamberanduesmustbeclea-
nedperiodicallybyR'sTechnicalAssistanceSer-
viceorbyaqualiedheatingengineer.
0 Donotuseabrasiveproducts,petrolortriethylene.
0 Never clean or service the boiler without rst di-
sconnectingitfromthemainselectricitysupplyby
turningthemainpowerswitchOFF.
F
PleaserememberthatTHEPERSONRESPONSIBLEFORSY-
STEM MANAGEMENT MUST ENSURE THAT PROFESSIONALLY
QUALIFIEDHEATINGENGINEERSUNDERTAKEPERIODICMAIN-
TENANCEANDCOMBUSTIONEFFICIENCYMEASUREMENTS.
R'sTechnicalAssistanceServiceisqualiedtosatisfy
these legal requirements and can also provide useful
informationonMAINTENANCEPROGRAMMESdesignedto
guarantee:
−greater safety
−compliancewithapplicablelegislation
−freedomfromtheriskofnesintheeventofspot
checks.

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RIELLO S.p.A.
37045 Legnago (VR)
Tel. [phone] - Fax [phone] - www.riello.it
As part of the company’s ongoing commitment to perfecting its range of products, the appearance, dimensions, technical data,
equipment and accessories may be subject to variation.