Buderus Ecomatic HS 2105 User manual

Service Manual
Ecomatic HS 2105
Save These Instructions !
5647 488 5/98 USA

1
TABLE OF CONTENTS
Introduction 3-4
Mounting Instructions 5-6
Testing the Manual Reset High Limit (STB) 7
Key Code 8
Program Overview and Description of the Installation Level
Entry Process 9-10
Installation Entries 11-30
Display of Heating Curve(s) 31
Testing of Relays 32
LCDTest 33
Total System Reset 34
Version Number 35
Trouble Shooting Procedures 36
Parameter Settings at the Installation Level 37
Sensor Curves 38-39
Wiring Diagrams 40-46
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2
3
4
5
6
7
8
9
10
11
12
13
14
15

Introduction 1
Brief Description of Control Operation
TheHS2105isaheatingsystemcontrollerintegratingthe
functionsofspaceheatingonoutdoorresetusinganoutdoor
sensor,priority domestichotwaterheating (DHW) ofan
indirectfiredwaterheater,periodicoperationofaDHW
recirculationpump as well as offeringprogrammablenight
setbackfor customizedoperation.Optionalmodules provide
2-stageor dual burner control andoutdoorresetcontrolofa
motorizedmixing valve for floor heatingapplications.
Note:Buderus HydronicSystems,Inc.strongly
recommendsthe use of a thermostaticvalveonthe
outletof the DHW storage tanktopreventscalding
whenoperating the HS2105 in manualoverride mode.
Two different controlmethodscanbe utilized withrespectto
spaceheating. Parameterslistedin boldareseton thecontrol.
Referto relevant sections in thismanualformoredetails.
Case1: All heatingzones are controlledby on/off
thermostats.
Thespace heating operates along aheatingcurve;
figure1 showsatypical curve.Theslopeisset bythe
“REF TEMP” value;the heating curvecanbeshifted
upor down with the“OFFSET”.The boiler maintains
temperaturewithin thedashedlinesof the burner
differential.Thecontrolusesthedifferencebetweenthe
specified“DAY TEMP” and“NIGHT TEMP” values
tocompute a lowerheatingcurvefornight mode operation.
OnacallforDHW,thecontrolcanfiretheburnerup
tothe “MAX TEMP 1” settingfor maximum recovery.
Thecontrol temporarily interrupts pump operationwith
theburner running when the boilerwatertemperature
dropsbelow the “PUMPLOGIC” settingforcondensation
protection.
3
Fig. 1: Typical heating curves for the HS2105 without a room sensor
MAX TEMP1 Heating Curve
(day mode)
Heating Curve
(night mode)
Burner
Differential
Pump Logic
Offset
200
180
160
140
120
100
80
60
RefTemp
70 60 50 40 30 20 14 10 0 -10 -20 -30
OUTSIDETEMPERATURE (˚F)
2

Mounting Instructions 2
5
• Removethe front panel oftheboiler.
• OnlynecessarywiththeG124X, G224E, G234X and G334X
boilers.
• Removethe two screwsandhousingfromthetop of the
Ecomatic.
• Insertthe two frontfeetofthecontrol into theholesprovided
onthe top of the boiler.Then,firmlypush downontherear of
thecontrol until it snaps intoplace.
•Thesensor bundle consists of onethermistor(FK),two
capillariesand aspacer.Mount thesensorsper thefollowing
boilerspecific instructions. Thechromewellis supplied with
the Ecomatic.
G115, G205, G305: Replace brasswellwithchrome Ecomaticwell.
Thesensor bundle must be fullyinsertedintotheEcomaticwell.
G124X: Unwrap the sensor bundle. Removespacers fromthechrome
wellontheboiler.Removethecoppersleeve from oneofthecapilaries.
Installall 3probesinwith the Honeywellcapillary.
G224E/G234X/G334X: Thetridicator assembly should be movedto
thesupply piping and replaced withthechromeplatedEcomaticwell.
Thesensorbundlemustbeinsertedintothiswell.
• Fastenthe controltotheboiler jacketusingthetwo screwsas
shown.
1 Introduction
4
Case2: Multiple zoneswith the mainzone on
constant circulation
Theheating curveis setinasimilarwayas in Case 1. A
roomsensor is required in theconstantcirculationzoneto
provideroom temperature compensation for fine-tuningof
theheating curve.Themain zonesetsthewatertemperature
availableto allsecondaryzones.Specified day andnight
temperatureson the room sensor areusedinternallyto
computea heating curveduringnightmode.
Case3 : Multiple Temperatures
Theheating curvefor thehightemperaturezone(s)
isset on CIRCUIT1.CIRCUIT2 definesthelow
temperatureheating curveusingamotorizedmixingvalve.
TheHS2105 controlpositionsthemixing valve based
onthe outside andsupplytemperaturemeasured byastrap-on
sensor.Eachheatingcircuit canbeequippedwithanoptional
room sensor.
Fig.2:HS2105heating curvewithroom sensoradjustment
Fig.3:Highandlow temperatureheatingcurves; requiresmodule FM241
MAX TEMP1 Heating Curve
(day mode)
Heating Curve
(night mode)
Burner
Differential
Pump Logic
Offset
200
180
160
140
120
100
80
60
RefTemp
70 60 50 40 30 20 14 10 0 -10 -20 -30
OUTSIDETEMPERATURE (˚F)
Room Sensor
Compensation Effect
Room Sensor
Compensation Effect
MAX TEMP1
Heating Curve Circuit 2
(day mode)
Heating Curve Circuit 2
(night mode)
Heating Curve Circuit 1
(night mode)
Heating Curve Circuit 1
(day mode)
Burner
Differential
Pump Logic
MaxTemp2
Offset
200
180
160
140
120
100
80
60
RefTemp
RefTemp
70 60 50 40 30 20 14 10 0 -10 -20 -30
OUTSIDETEMPERATURE (˚F)

Mounting Instructions 2
5
• Removethe front panel oftheboiler.
• OnlynecessarywiththeG124X, G224E, G234X and G334X
boilers.
• Removethe two screwsandhousingfromthetop of the
Ecomatic.
• Insertthe two frontfeetofthecontrol into theholesprovided
onthe top of the boiler.Then,firmlypush downontherear of
thecontrol until it snaps intoplace.
•Thesensor bundle consists of onethermistor(FK),two
capillariesand aspacer.Mount thesensorsper thefollowing
boilerspecific instructions. Thechromewellis supplied with
the Ecomatic.
G115, G205, G305: Replace brasswellwithchrome Ecomaticwell.
Thesensor bundle must be fullyinsertedintotheEcomaticwell.
G124X: Unwrap the sensor bundle. Removespacers fromthechrome
wellontheboiler.Removethecoppersleeve from oneofthecapilaries.
Installall 3probesinwith the Honeywellcapillary.
G224E/G234X/G334X: Thetridicator assembly should be movedto
thesupply piping and replaced withthechromeplatedEcomaticwell.
Thesensorbundlemustbeinsertedintothiswell.
• Fastenthe controltotheboiler jacketusingthetwo screwsas
shown.
1 Introduction
4
Case2: Multiple zoneswith the mainzone on
constant circulation
Theheating curveis setinasimilarwayas in Case 1. A
roomsensor is required in theconstantcirculationzoneto
provideroom temperature compensation for fine-tuningof
theheating curve.Themain zonesetsthewatertemperature
availableto allsecondaryzones.Specified day andnight
temperatureson the room sensor areusedinternallyto
computea heating curveduringnightmode.
Case3 : Multiple Temperatures
Theheating curvefor thehightemperaturezone(s)
isset on CIRCUIT1.CIRCUIT2 definesthelow
temperatureheating curveusingamotorizedmixingvalve.
TheHS2105 controlpositionsthemixing valve based
onthe outside andsupplytemperaturemeasured byastrap-on
sensor.Eachheatingcircuit canbeequippedwithanoptional
room sensor.
Fig.2:HS2105heating curvewithroom sensoradjustment
Fig.3:Highandlow temperatureheatingcurves; requiresmodule FM241
MAX TEMP1 Heating Curve
(day mode)
Heating Curve
(night mode)
Burner
Differential
Pump Logic
Offset
200
180
160
140
120
100
80
60
RefTemp
70 60 50 40 30 20 14 10 0 -10 -20 -30
OUTSIDETEMPERATURE (˚F)
Room Sensor
Compensation Effect
Room Sensor
Compensation Effect
MAX TEMP1
Heating Curve Circuit 2
(day mode)
Heating Curve Circuit 2
(night mode)
Heating Curve Circuit 1
(night mode)
Heating Curve Circuit 1
(day mode)
Burner
Differential
Pump Logic
MaxTemp2
Offset
200
180
160
140
120
100
80
60
RefTemp
RefTemp
70 60 50 40 30 20 14 10 0 -10 -20 -30
OUTSIDETEMPERATURE (˚F)

1. Switchthe control on
withthe main power
switch(IPosition).
2. Enterthe key code
(Seepage 8).
3. Turn the dial until “RELAYS”appearsinthedisplay.
4. Press and hold the button.Turnthe dial until
the displayshows “BURNER ON”.Theburnerstarts.
Heatingpumpswillnotrunduringtheburnertest.
Allowthe burner torununtilburner shuts offatthe
setpointon the aquastat dial.
5. Removethe black aquastat dial.
6. Push the green button inwithscrewdriverorsimilar
instrumentto bypasstheadjustableboiler aquastat.
Holdthe green button until theSTBormanualreset
highlimittrips.This happensatapproximately 230°F.
7. Runcirculatorstoremoveexcessheat.Then,to reset
theSTB,removethe safety nut.Pressinthereset
buttonunderneath.Thiswillreturnthecontrolback
tonormal operation.
ToResumeNormalOperation:
PresstheAUTbutton.
Testing the Manual Reset High Limit (STB) 3
BURNER ON
Aquastat Dial
Green Button
Safety Nut
180
7
RELAYS
oF
70
oF
70
2 Mounting Instructions
6
• Electricalconnections must bemadeaccordingto the wiring
diagram(See pages 40-46).
• Allthe wires should be routedthroughthecableracewayat the
rearof theboiler.Rearpanel jacketmaybemodified perlocal
code.Route the wiresontopofthe insulation tothebackof the
control.
• Usethe white strain reliefs providedtolockall cables into place
onthe back of the control.
• Replacethe top housingofthecontrol and fastenthetwo screws.
Thecontrol isreadytobe placed intooperation.
• Tiltthe display to the desiredposition.

1. Switchthe control on
withthe main power
switch(IPosition).
2. Enterthe key code
(Seepage 8).
3. Turn the dial until “RELAYS”appearsinthedisplay.
4. Press and hold the button.Turnthe dial until
the displayshows “BURNER ON”.Theburnerstarts.
Heatingpumpswillnotrunduringtheburnertest.
Allowthe burner torununtilburner shuts offatthe
setpointon the aquastat dial.
5. Removethe black aquastat dial.
6. Push the green button inwithscrewdriverorsimilar
instrumentto bypasstheadjustableboiler aquastat.
Holdthe green button until theSTBormanualreset
highlimittrips.This happensatapproximately 230°F.
7. Runcirculatorstoremoveexcessheat.Then,to reset
theSTB,removethe safety nut.Pressinthereset
buttonunderneath.Thiswillreturnthecontrolback
tonormal operation.
ToResumeNormalOperation:
PresstheAUTbutton.
Testing the Manual Reset High Limit (STB) 3
BURNER ON
Aquastat Dial
Green Button
Safety Nut
180
7
RELAYS
oF
70
oF
70
2 Mounting Instructions
6
• Electricalconnections must bemadeaccordingto the wiring
diagram(See pages 40-46).
• Allthe wires should be routedthroughthecableracewayat the
rearof theboiler.Rearpanel jacketmaybemodified perlocal
code.Route the wiresontopofthe insulation tothebackof the
control.
• Usethe white strain reliefs providedtolockall cables into place
onthe back of the control.
• Replacethe top housingofthecontrol and fastenthetwo screws.
Thecontrol isreadytobe placed intooperation.
• Tiltthe display to the desiredposition.

Movingaround theMainMenus
•Thekey codeallowsaccessto the mainmenus.
• Toaccessdifferentmenus,turnthedial.
• Toaccessasubmenu,pressandreleasethe buttonfrom
themainmenu.
• Tomoveaboutthatspecificsubmenuandreviewthespecific
entries,turnthedial.Eachentryinthatspecificsubmenu
appearsnowinthedisplayasthedialisturned.
• Tochangethevalueofaspecificentryinthe submenu,firstget
thatentryinthedisplaybyturningthedial,thenpushand
holdthe button.Thedisplayshowsthespecificentry
blinkingwithitscurrentvalue.Turnthedialtoselectthe
desiredvalue.Releasethe button.Thiswillsavethenew
value.
• Tomovetothenextentryinthisspecificsubmenu,turnthedial.
• To movebackto themainmenu,pressand releasetheRETURN
button.
• Toreturntothestandarddisplay,pressandreleasetheAUTbutton.
Note:TheHS2105controlautomaticallygoesbacktothestandarddisplayif
noentriesaremadewithinfiveminutes.
Program Overview 5
+
+
AMERICAN
PERIM-HTG
PERIM -HTG
REF TEMP
REMOTE 1
BLR TEMP
CIRCUIT1
CIRCUIT1
CIRCUIT1
TheInstallation level consists of amaximumof12mainmenus. Each main menu addressesaspecificsetoffeatures
ofa certaincomponentof theheatingsystem.These featuresarecontained insubmenus.Mostvaluesarechangedatthe
submenulevel,notatthemainmenulevel.
Notice:Anumberofentrieswillonlyappearwhentheircorrespondingmodulesareinsertedinthecontrol.
Thesemodulesandtheirfunctionsare:
ModuleFM241: Mixingvalvecontrolmodule.
ModuleFM242: Two stagefiringcontrolmodule.
ModuleKM271: Communicationsmodule.CurrentlynotavailableintheU.S.A.
Whenanyofthesemodulesareinstalled,theHS2105control automaticallyrecognizesthemandreleasesaccesstothe
correspondingmenus,submenusandtheirentries.
9
Key Code
Theaccess to the installation leveloftheHS2105control
isprotected against unauthorized use byaspecialkey
code.Entry in this level allowsyoutochangesettings
describedin this manual.
Thisinstallation level should only beaccessedbyaheating
contractororatrained operator.Entriesatthislevel
identifyto the control the differentcomponentsofthe
heatingsystem, specify how these componentsaretobe
operatedand set up the properheatingcurve(s).These
entriesin generaldonotrequire any adjustment.Any
adjustmentsmust be performed by aheatingcontractor
ora trained operator.
4 Key Code
KeyCodeAccess Procedure for access to the
Installation Level
• Pressand hold the lowerlefthandENTER
button.
• Inserta pointed object into theholedirectly
tothe right of the ENTER button.
• Releaseboth buttons.Thedisplayreads
“DEUTSCH”(GERMAN).
DEUTSCH
To change the language selection:
•Enterthekeycode.Theword“DEUTSCH”
(GERMAN)appears inthe display.
• Pressand holdthe button.
•Turnthedialtoselectthe“AMERICAN”
language selection.
Returnedto the Standard Display:
• PresstheAUTbutton.
Note:The controlresumesautomatic operationifno
entriesare madeforaperiod of 5minutes.
8
AMERICAN

Movingaround theMainMenus
•Thekey codeallowsaccessto the mainmenus.
• Toaccessdifferentmenus,turnthedial.
• Toaccessasubmenu,pressandreleasethe buttonfrom
themainmenu.
• Tomoveaboutthatspecificsubmenuandreviewthespecific
entries,turnthedial.Eachentryinthatspecificsubmenu
appearsnowinthedisplayasthedialisturned.
• Tochangethevalueofaspecificentryinthe submenu,firstget
thatentryinthedisplaybyturningthedial,thenpushand
holdthe button.Thedisplayshowsthespecificentry
blinkingwithitscurrentvalue.Turnthedialtoselectthe
desiredvalue.Releasethe button.Thiswillsavethenew
value.
• Tomovetothenextentryinthisspecificsubmenu,turnthedial.
• To movebackto themainmenu,pressand releasetheRETURN
button.
• Toreturntothestandarddisplay,pressandreleasetheAUTbutton.
Note:TheHS2105controlautomaticallygoesbacktothestandarddisplayif
noentriesaremadewithinfiveminutes.
Program Overview 5
+
+
AMERICAN
PERIM-HTG
PERIM -HTG
REF TEMP
REMOTE 1
BLR TEMP
CIRCUIT1
CIRCUIT1
CIRCUIT1
TheInstallation level consists of amaximumof12mainmenus. Each main menu addressesaspecificsetoffeatures
ofa certaincomponentof theheatingsystem.These featuresarecontained insubmenus.Mostvaluesarechangedatthe
submenulevel,notatthemainmenulevel.
Notice:Anumberofentrieswillonlyappearwhentheircorrespondingmodulesareinsertedinthecontrol.
Thesemodulesandtheirfunctionsare:
ModuleFM241: Mixingvalvecontrolmodule.
ModuleFM242: Two stagefiringcontrolmodule.
ModuleKM271: Communicationsmodule.CurrentlynotavailableintheU.S.A.
Whenanyofthesemodulesareinstalled,theHS2105control automaticallyrecognizesthemandreleasesaccesstothe
correspondingmenus,submenusandtheirentries.
9
Key Code
Theaccess to the installation leveloftheHS2105control
isprotected against unauthorized use byaspecialkey
code.Entry in this level allowsyoutochangesettings
describedin this manual.
Thisinstallation level should only beaccessedbyaheating
contractororatrained operator.Entriesatthislevel
identifyto the control the differentcomponentsofthe
heatingsystem, specify how these componentsaretobe
operatedand set up the properheatingcurve(s).These
entriesin generaldonotrequire any adjustment.Any
adjustmentsmust be performed by aheatingcontractor
ora trained operator.
4 Key Code
KeyCodeAccess Procedure for access to the
Installation Level
• Pressand hold the lowerlefthandENTER
button.
• Inserta pointed object into theholedirectly
tothe right of the ENTER button.
• Releaseboth buttons.Thedisplayreads
“DEUTSCH”(GERMAN).
DEUTSCH
To change the language selection:
•Enterthekeycode.Theword“DEUTSCH”
(GERMAN)appears inthe display.
• Pressand holdthe button.
•Turnthedialtoselectthe“AMERICAN”
language selection.
Returnedto the Standard Display:
• PresstheAUTbutton.
Note:The controlresumesautomatic operationifno
entriesare madeforaperiod of 5minutes.
8
AMERICAN

▲
11
Freeze Protection: “FREEZTEMP”
Toprevent the heating systemfromfreezing,the control willautomatically
permitthe heating circulators to runcontinuouslyinthenightmode when
theoutside temperaturedropsbelowthe “FREEZTEMP” valueirrespective
ofthe selected setback mode.
Thefactorysettingis41˚F;the range is 0˚F to 50˚F.
To change the FREEZTEMP:
• Enterthe key code.
• Turn thedialuntil theword“BLR TEMP”appearsinthedisplay.
• Pressthe button and release.
Thedisplaywillshow“FREEZTEMP”.
• Pressand hold the button.
Thecurrent valueofthe“FREEZTEMP” isblinking.
• Turn the dial until thedesired“FREEZTEMP”valueappearsin the display.
Returnto the mainmenu:
• Pressthe return.
RETURN TO THE STANDARDDISPLAY:
• PresstheAUTbutton.
Note: Thecontrolresumesautomatic operationifnoentries aremadefora
periodof five minutes.
Note 1: The“FREEZTEMP”settingisthe determiningvaluewhenusing
the“OASETBACK”setbackmode.Thecirculatorswillnotoperateinnight
modewhen theoutsidetemperature exceedsthe“FREEZTEMP” value.The
circulatorswill run constantly for outsidetemperaturesbelowthe
“FREEZTEMP” value.
Note2: The“FREEZTEMP”settingis alsoofsignificancein termsof
pumpoperation duringthenightmode whenusingroom sensors.Theheating
circulators(on circuits 1 and 2)willstopwhentheactual room temperature
exceedsthe desirednighttemperature ANDtheoutside temperatureexceeds
the“FREEZTEMP” value.
Installation Entries 6
BLR TEMP
FREEZTEMP ˚F
40
❅
FreezeProtection:“FREEZTEMP” 0˚Fto50˚F 41˚F
Range Factory Setting Current Setting
BURNER
BURNER2*1),MODBNR*2
HTG1 PUMP
HTG2 PUMP
MIXVALVE*5)
DHW PUMP*6)
RECIRPUMP*6)
10
5 Program Overview
ListingofEntries at theInstallation Level
Accessto the installation is doneusingthekeycode.
Display Read-out +
DEUTSCH Language selection
BLR TEMP
CIRCUIT1
CIRCUIT2
Boiler parameters
HeatingZone1InstallationParameters(unmixedzone)
HeatingZone2InstallationParameters(mixedzone)*5
Frost protection temperature
Buildingheatstoragecapacity
Burner operation details
Minimumfiringrateforamodulatingburner*2
Modulationtimeforfullmodburner*2
WatertemperaturesettingforPumplogic
Maximumelectronichighlimitforboilertemperature
Fluegaswarningtemperature*3
Identifiesnatureofhightempzone(baseboard,radiatorsetc.)
ReferenceTemperatureforspecifyingboilerzoneresetcurve
Roomsensorpresentforunmixedzoneyes/no
Room temperature compensation*4
Setback mode selection
Offset,verticalshiftofresetcurve
Identifiesnatureoflowtemperaturemixedzone
ReferenceTemperatureforspecifyingboilerzoneresetcurve
DHW priorityonmixedzone*6
Maximumelectronichighlimitformixedzone
Roomsensorpresentformixedzoneyes/no
Room temperature compensation*4
Setback mode selection
Offset,verticalshiftofresetcurve
Domestichotwateryes/no
DHW recirculation pump
Heatingcurveforunmixedzone
Heatingcurveformixedzone
Burner Relay
Burner2Relay*1),Modulationhigher/lower*2)
Boilerzonepump(unmixedheatingcircuit)
Mixedzonepump(mixedheatingcircuit)
Mixing valve open/close*5)
Tank charging pump*6)
DHW recirculation pump*6)
LCD test
Generalsystemresettofactorysettings
Control version number
PERIM-HTG
REF TEMP
REMOTE 1
ROOM COMP*4
OASETBACK
OFFSET
FREEZTEMP
BLDG RESP
TWO STAGE*1
MIN MOD*2
MOD TIME*2
PUMPLOGIC
MAX TEMP1
FLUE TEMP*3
FLOOR-HTG
REF TEMP
DHWPRIOR
MAX TEMP2
REMOTE 2
ROOM COMP*4
OASETBACK
OFFSET
RELAYS
LCD- TEST
RESET
VERSION
DHWPROD
RECIRPUMP
HTGCURVE 1
HTGCURVE 2
Relaytestondifferentsystemcomponents
*1 AppliesonlywithmoduleFM242installedand2stageburnerselected.
*2 AppliesonlywithmoduleFM242installedandmodulatingburnerselected.
*3 AppliesonlywithmoduleKM271.
*4 Appliesonlywithremotesensorinstalled.
*5 AppliesonlywithModuleFM241installed.
*6 Appliesonlywithdomestichotwaterinstalled.
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