Wolf CGG-1K-24 User manual

1
3062087_0207
die dem Menschen dient.Technik,
Installationand
operatinginstructions
Gas fired wall mounted boiler
CGG-1K-24/28
Part no. 30 62 087 Subject to modifications
WolfGmbH·Postfach1380·D-84048Mainburg·Tel.[phone]·Fax[phone]·Internet:www.wolf-heiztechnik.de
02/07 GB

23062087_0207
Index
General information
Safetyinstructions / Standardsand regulations.............................................. 3-4
Operation
Control /Function/ Operation ........................................................................... 5
Installation
Dimensions / Installationdimensions ................................................................ 6
LayoutCGG-1K-24/28 ................................................................................... 7-8
Positioninginformation/Installation .................................................................. 9
Installation
Onfinished walls ............................................................................................ 10
Onunfinished walls .........................................................................................11
Fluegas butterfly orificeplate / Routingventilation air /flue gas ................. 12-13
Powerconnection........................................................................................... 14
Commissioning
Fillingthe system............................................................................................ 15
Commissioning / Checking the gas supply pressure ...................................... 16
Boiler settings and matching
Displaying/ modifying controlparameters ...................................................... 17
Limiting the maximumoutput .......................................................................... 18
Selectingthe pump stage .......................................................................... 19-20
Commissioningreport .................................................................................... 21
Inspection and maintenance
Inspectionand maintenance /Service report .................................................. 22
Service report ................................................................................................. 23
Service ...................................................................................................... 24-25
Additionalinformation
Conversionto other gastypes ................................................................... 26-31
Flue gas test................................................................................................... 32
Wiringdiagram ............................................................................................... 33
Specification ................................................................................................... 34
Fault / Cause / Remedy.................................................................................. 35
ECDeclaration of Conformity ......................................................................... 36

3
3062087_0207
The following symbols are used in conjunction with these
important instructions concerning personal safety as well
as operational reliability.
Safety instructions
This indicates technical instructions that you
must observe to prevent material losses and
boiler malfunctions.
NB
Danger through 'live' electrical components.
NB Switch OFF the ON / OFF switch before
removing the casing.
Never touch electrical components or contacts
when the ON / OFF switch is in the ON position.
This results in a risk of electrocution that may
lead to injury or death.
The main supply terminals are 'live' even when
the ON / OFF switch is in the OFF position.
"Safetyinstructions"areinstructionswithwhich
you must comply exactly, to prevent injury and
material losses.
Fig.:Terminal box: Danger fromelectriccurrent
Fig.:Gasconnection: Escaping gasmaycause poisoning ortherisk of
explosion
Fig.: Ignition transformer, high voltage ignition electrode, combustion
chamber
Riskofelectrocution,risk of burning through hotcomponents
Fig.:Gascombination valve
Dangerfromelectric current
Escaping gas may cause poisoning or the risk of explosion

43062087_0207
Safetyinstructions/Standardsandregulations
Pleasefollow these safety instructions closely to preventaccidents and material losses.
Commissioning - Commissioning must only be carried out by the system installer or a commissioning
engineer designated by him.All actual values must be recorded in a commissioning/
servicereport that should be keptwith these instructions.
Safety regulations - Observeallnational safety regulationsandinstallation requirements.
- Installation,commissioning, inspection, maintenanceand repairs mustonlybe carried
outby a competentperson (heating engineer/installation contractor).
- Beforeworking on theequipment / heating system, switchOFF the powersupply (e.g.
by removing a separate mains fuse or by means of a main electrical isolator) and
safeguardagainstunauthorised reconnection.
- Disconnect the system by means of a device that isolates all non-earthed conductors
simultaneouslywith at least 3 mm contact separation.
- Itis not permitted to carryout repairson parts that fulfil asafety function.
- Use only original WOLF replacement parts or those that are equivalent and that have
beenapprovedby the manufacturer.
Instructing the system user - Thesysteminstallermusthandtheoperatinginstructionstothesystemuserandinstruct
him/herin the operation of thesystem.
Standards and regulations Category: II2H3B/P, <PL>II2ELw3B/P, II2H3P
NOx class: 3
Efficiency:  (3 stars acc. to 92/42/EEC)
Fluetypes: C12x, C32x, C42x,C52, B32
Operating mode: Open flue / balanced flue
To beconnected to: Chimney /balanced flue chimney/ balancedflue
Standards Directives
EN297 90/396/EEC
EN483 2004/108/EC
EN60335-1 73/23/EEC
EN 50 165 92/42/EEC
EN55014
EN61000-3-2/-3
- Obtainthepermissionof your mains gassupplierandall relevant authorities priortothe
installationof Wolf gas fired combiboilers.
- Open flue gas fired boilers must only be installed in a room that complies with the
appropriateventilationrequirements.

5
3062087_0207
Control / Function / Operation
ON / OFF switch DHW
temperature
selector Pressure
gauge
Reset
button
Heating water
temperature selector
Illuminated
signalring
Thermometer
In conjunction with the accessory controllers BM /AWT/ ART, the settings at the boiler
relatingto DHW andheating water aredisabled.
Note:
Signal ring as
status display Display Explanation
Flashinggreen Standby(power supply ON, burner OFF)
Constantgreen light Heat demand: pumprunning, burner OFF
Flashingyellow Emissions test mode
Constantyellowlight Burner ON, flamesteady
Flashingred Fault
9
1
28
3
7
4
6
5
DHW temperature selector
The settings 1-9 correspond to a DHW temperature of 40 to 60 °C. Combined with a
control thermostat for wall mounted gas fired boilers, the adjustment at the DHW
temperatureselector is disabled;insteadthe temperature isselected at theboiler control
thermostat.
28
3
7
4
6
5
Heating water temperature selector
Thesettingrange2-8 correspondstoaheatingwatertemperatureof40 to80°C.Combined
witha control thermostat forwall mounted gasfiredboilers, the adjustmentatthe heating
water temperature selector is disabled; instead the temperature is selected at the boiler
controlthermostat.
Emissions test mode
Turningtheswitchtoposition letstheboileroperateatmaximumoutput.Theilluminated
signalringflashes yellow for15minutes or untilthemaximum flow temperaturehasbeen
exceeded.
Summermode
Switchsetto circulationpumpOFF(heating OFF); only DHW heating, frostprotection,
pumpanti-seizingprotectionenabled, i.e. the circulationpumprunsforapprox. 30 s every
24hours.
°C
0 120
bar
04
2
13
Thermometer/pressure gauge
Theheating water temperatureis displayed inthe upper half, the heatingsystem water
pressurein the lower half.
Setting Winter mode (position 2 to 8)
Thecirculation pump operatesin heating mode.

63062087_0207
Dimensions / Installation dimensions
1 Heatingflow
2 DHW
3 Coldwater
4 Heatingreturn
5 Gasconnection
Min.200Min.200
Min.40
Minimumclearances
190 393
855
73134
5
2
31 4
176
440
170
694
2
5
7
.
5
39 49
344
5
12
3
4

7
3062087_0207
Layout
CGG-1K-24/28
Fluegas fan
Combustionchamber
Internalfillingfacility
(optional)
Gas combination
valve
Expansionvessel
Three-waydiverter
valve
Flow sensor 2
Limitthermostat
LAFconnection flue gas
butterflyorificeplate
Monitoring
electrode Ignitionelectrode
Heatingwaterheat
exchanger
Differential
pressure switch
Safetyvalve
Drainvalve
DHW flow &
temperaturesensor
Flow sensor 1
Fluegas
collectorbox
Gasburner
Heating circuit
strainer
Coldwater strainer
withthroughputlimiter
Heatingcircuit pump
Airventvalve
Bypass

83062087_0207
Layout
Heatingwaterheat
exchanger
Gasburner
Gascombination
valve
Expansionvessel
Airvent
Heatingcircuit
pump
DHWheat
exchanger
Safetyvalve
Drainvalve
Heatingcircuit
strainer
Coldwater strainer with
throughputlimiter
Limitthermostat
Flow sensor 2
Flow sensor 1
Three-waydivertervalve
DHWflow
&temperature sensor
Bypassvalve
Hydraulic
assembly
Overflowvalve

9
3062087_0207
Positioning information / Installation
- Determine the installation location for the gas fired boiler;
maintain the specified minimum clearances (see the r.h.
diagram).
- Fittheinstallationtemplate(paperposter)suppliedtothewall.
- Transferthe fixinghole and connection positions markedon
theinstallation template tothe wall (e.g.with a powerdrill).
- Removetheinstallation template.
- DrillØ 12 mmholes forthe mounting bracketand secure the
bracket using the rawl plugs and screws supplied. (Before
securing the bracket, check that the rawl plugs are suitable
forthe wall construction.)
- Remove the casing lid of the gas fired boiler. For this, pivot
the control unit lid down, hook in the r.h. and l.h. turn buckle,
undothe bottom ofthe casinglid and unhookat the top.
- Hangthegasfiredboilerwiththehook-inbraceonthebackof
theboiler into the mountingbracket.
General
The gas fired boiler may only be installed in rooms that are
protectedfrom frost.
During the boiler installation ensure that all fixings
aresufficientlystrongtocarryitsweight.Alsoconsider
the wall consistency, otherwise gas or water may
escapewhichcouldlead to explosionsandflooding.
During the boiler installation, ensure that no
contaminants (e.g. drilling swarf) enter the gas
fired boiler otherwise faults may develop.
The combustion air supplied to the boiler must be
freefromchemicals,e.g.fluoride,chlorineorsulphur.
Suchmaterialsarecontainedinsprays,solventsand
cleaning agents. Under the most unfavourable
conditions,these may leadto corrosion, evenin the
flue gas system.
Balanced flue gas fired boilers must only be
installed in a room that complies with the
appropriateventilation requirements. Otherwise
thereisariskofasphyxiationorpoisoning.Read
these installation and operating instructions
before installing the gas fired boiler. Also take
the technical guide into consideration.
Fig.:Installationtemplate
200
40
Forinstallationofthe gas fired boilerinsideacupboard note the
following: Never install the gas fired boiler on the back wall of
the cupboard, as this component may not be
substantial enough to carry the boiler weight. This
would create the risk of water and gas leaks which
inturnwouldresultinariskof explosion and flooding.
- Removethe back wall of thecupboard
Minimum clearance between the gas fired boiler and the cupboard
sides 25 mm.
Installation inside a cupboard
l.h.turnbuckle r.h.turnbuckle
Fig.:Openingthe turnbuckle
NB

10 3062087_0207
Installation
Gas connection
Laying the gas pipe as well as making the gas
connections must only be carried out by a licensed
gas fitter. Close the gas ball valve on the gas fired
combi boiler to pressure test the gas pipe.
Removeall residues fromtheheating pipework and
thegas pipeprior to connecting the gas fired boiler,
particularlyin older systems.
Prior to commissioning, test all pipe and gas
connectionsfor leaks.
Inappropriate installation or using unsuitable
components or assemblies may lead to gas
escaping, which results in a risk of poisoning and
explosion.
The gas valve can be subjected to a maximum
pressure of 150 mbar. Higher pressure may
damage the gas valve, resulting in a risk of
explosion, asphyxiation or poisoning. Close the
gas ball valve on the gas fired boiler to pressure
test the gas pipe.
Install a tested and certified pressure reducer,
if the cold water supply pressure is above the
maximumpermissibleoperatingpressureof10bar.
Otherwise water could escape resulting in a risk
of flooding.
Fig.:Cold water connectionin accordance withDIN 1988
Drain
Drain
Shut-offvalve
Pressurereducing valve
Shut-offvalve
Coldwater inlet
Pressuregauge port
Drinkingwater filter
Safetyvalve
Cold water and DHW connection
For the cold water and DHW connection, we recommend the
installationin accordance with DIN1988.
- Wolf connection sets (accessories) are available for
installationon finished andunfinished walls. Theconnection
pipesare Cu 18x1.
Hydraulic connections
Note: As standard, a combined cold water strainer with
throughput controller is fitted at the cold water
connectionof theboiler.(seeFig.)


Fig.:Throughput controller withcold water strainer
Installation on finished walls
Fig.:Frontview,connectionset for installationonfinishedwalls
(partno. 86 12188)
Heatingflow
DHW
Coldwater
Heatingreturn
Gasconnection

11
3062087_0207
Installation
Installation on unfinished walls
Fig.:Frontview,connectionsetforinstallationonunfinishedwalls
(partno. 86 12189)
Fig.:Viewfrombelow,connectionsetfor installation on finished
walls(part no.86 12 188)
Fig.: View from below, connection set for installation on
unfinishedwalls (part no.86 12 188)

12 3062087_0207
Flue gas butterfly orifice plate / Routing
ventilation air / flue gas
Fluegas
butterflyorifice
plate
- Prior to installing the flue gas system, check using the
appropriate tables, which of the flue gas butterfly orifice
plates suppliedshould be used. This issubject to thelength
ofthebalanced flue pipe.
Selection of the flue gas butterfly orifice plate
General information:
From a length of 3 m upwards, we recommend the
installationof a condensate trap.
Never exceed the maximum lengths specified
in the tables, otherwise incompletecombustion
mayresult.
Calculating the flue length 60/100 mm
Calculated flue length = length of straight pipes + 1.0 m per 90° bend / tee + 0.5 m per 45° bend
If the CO content in the flue gas is higher than
300 ppm (free of air), remove the cause;
otherwise do not continue to operate the gas
fired boiler, as there would be a risk of flue gas
escaping, resulting in the danger of poisoning.
Wolf boilers are certified as one unit with the
original Wolf balanced flue system. Use only
original Wolf balanced flue systems. Using
alternative accessories can lead to incorrect
functions. Material losses and injuries cannot
then be prevented.
Type C32x
Roofoutlet(balanced flue)
concentric vertical system 60/100 mm
calculated pipe length min. / max. = 0.3 / 5.0 m
Boiler Calculated Flue gas butterfly
CGG-1K length orifice plate no. Ø
24 ≤3 m 1 (38.0 mm)
>3 m 2 (39.8 mm)
≤5 m
28 ≤2 m 2 (39.8 mm)
>2 m 3 (42.5 mm)
≤5 m
Type C12x
Outsidewall connection (balancedflue)
concentric horizontal system 60/100 mm
calculated pipe length min. / max. = 0.3 / 5.0 m
Boiler Calculated Flue gas butterfly
CGG-1K length orifice plate no. Ø
24 ≤3 m 1 (38.0 mm)
>3 m 2 (39.8 mm)
≤5 m
28 ≤2 m 2 (39.8 mm)
>2 m 3 (42.5 mm)
≤5 m

13
3062087_0207
Balanced flue system
Type C42x
Connectionto a roomsealed balanced flue
concentric system 60/100 mm
Boiler Calculated Flue gas butterfly
CGG-1K lengthA + B orifice plate no. Ø
24 ≤2 m 1 (38.0 mm)
28 ≤2 m 2 (39.8 mm)
Room sealed balanced flue / duct sizing through calculation
according to EN 13384 or country-specific standard as
atmospheric pressure system with an inlet pressure = 0 Pa
Type B32
Connectionto a chimney;
ventilation air directly via the boiler or through a horizontal
concentricsupply line (openflue)
concentric system 60/100 mm
Boiler Calculated Flue gas butterfly
CGG-1K lengthA + B orifice plate no. Ø
24 ≤3 m 1 (38.0 mm)
28 ≤2 m 2 (39.8 mm)
Room sealed balanced flue / duct sizing through calculation
according to EN 13384 or country-specific standard as
atmospheric pressure system with an inlet pressure = 0 Pa
Type C52
Connection to the flue in a duct and ventilation air through an
externalwall (balanced flue) system 80/80mm
Boiler Calculated length Flue gas butterfly
CGG-1K A + B + C + D orifice plate no. Ø
24 ≤13 m 39.8 mm
28 ≤12 m 42.5 mm
Room sealed balanced flue / duct sizing through calculation
according to EN 13384 or country-specific standard as
atmospheric pressure system with an inlet pressure = 0 Pa

14 3062087_0207
Power connection
The mains terminals in the terminal box are 'live'
even when the ON / OFF switch has been
switched OFF. Non-observance can result in a
risk of electrocution, which may be detrimental
to health or lead to death.
- Connection, outside temperature sensor
Theoutside temperature sensorfor digital controlaccessory
(e.g. BM) may be connected to the terminal strip of the gas
firedboiler or theterminal strip ofthe BM.
- Connection of digital Wolf control accessories (e.g.ART,
AWT, MM, BM)
Only connect control units from the Wolf accessory range.
Eachaccessoryis supplied withitsown connection diagram.
Use a 2-core cable (cross-section > 0.5mm²) as the
connectingcablebetween the controlunitaccessory and the
gasfiredboiler.
- Connection, room thermostat 230 V
Connect the room thermostat cable at the terminals in
accordancewith the wiring diagram; firstremove the jumper
betweenthe respective terminals.
Connection,
outside
temperature
sensor
Connection,
digital Wolf control
accessories
Connection,
room
thermostat
Connection,
powersupply
230VAC/50Hz
Installation information
Power connection
- Isolatethe system fromthe power supplybefore opening.
- Pivotthe control unitto the side.
-Open the terminal box.
- Insertthe strain reliefintothe holes provided.
- Stripapprox. 70 mm offthe power supplycable insulation.
- Pushthe cable throughthe strain reliefand secure thestrain
relief.
- Pushthe insertsback intothe terminalbox casing.
- Terminate theappropriate cores insidethe terminal box. Terminal box
Only qualified electricians must carry out the
electrical installation; that installer will be
responsible for compliance with all current
standards and directives.

15
3062087_0207
Filling the system
Filling the system Fill the system and vent it thoroughly to safeguard the perfect function
of the gas fired boiler.
The heating water must not be mixed with inhibitors or antifreeze;
otherwise leaks and flooding could result.
- Beforeconnecting the gasfired boilerto the heatingsystem, flush theentire system to
removeresidues suchas weldingpearls, hemp,putty,etc. from the pipework.
- Fill the DHW system of the boiler until water flows out of a DHW draw-off point.
- Openthecap oftheautomaticair-ventvalve ontheheatingcircuitpumpbyonerevolution,
butdo notremove the cap.
- Openall radiator valvesand the shut-offvalveson the heatingwater sideof the boiler.
Procedure for boilers with internal
fillingfacility - Fill the entire heating system and boiler viathefillingfacilityoranon-sitefill&drainvalve
upto approx. 1.5bar,whilstsimultaneouslyventingtheheating system.
- Closethe shut-off valveson theheating water sideof the boiler (flow andreturn).
- Pushthe drain hoseonto thedrain valve ofthe hydraulic assembly.
- Flush all air out of the heat exchanger by simultaneously opening the internal filling
facilityand the drainvalveon the hydraulicassembly.
Procedure for boilers without
internalfilling facility - Fill the entireheatingsystem and boilerviaan on-site fill &drainvalve up toapprox.1.5
bar,whilstsimultaneouslyventingthe heating system.
- Closethe return shut-offvalve on theheating water sideof theboiler.
- Pushthe drain hoseonto thedrain valve ofthe hydraulic assembly.
- Flushall air out ofthe heat exchangerbysimultaneously opening theon-site fill &drain
valveand the drain valveon the hydraulicassembly.
- Removethe drain hoseand open theboiler shut-off valveson the heatingwater side
again.
- Openthe gas ballvalve.
- Starttheboiler,set the heatingwater temperature selectorto position "2" (pump
running,illuminated signal ring (statusdisplay) constantly green).
- Ventthepump; for this,briefly open andthen retightenthe air ventscrew.
Top up with water when the system pressure falls severely.
- Openthe gas shut-off valve. Press the resetbutton.
- Inconstantoperation, the heatingcircuit will be automaticallyvented via the heating
circuitpump.
Internalfilling
facility
(option)
Drainvalve

16 3062087_0207
Commissioning/
Checking the gas supply pressure
Prior to installation, ensure that the boiler corresponds to the
gastypeavailable.
Only qualified personnel must carry out the
commissioning and boiler operation as well as
the user instruction to prevent dangers and
injuries as well as material losses.
Gastype Wobbe index Ws
kWh/m³ MJ/m³
NaturalgasH 12.7 - 15.2 45.7- 54.7
LPG 20.3- 24.3 72.9 -87.3
À
- Open the gas connections.
- The boiler and system must be fully vented and must be
absolutelytight.
- Check that all flue gas accessories have been correctly
installed.
- Removethe casing cover.
- Release the plug at test nipple and vent the gas supply
pipe.
- Retightentheplug.
- Starttheboiler.
- Checktheignition andtheregularflamestructureoftheburner.
- If the system water pressure falls below 1.5 bar, top up with
water up to 1.5 to max. 2.5 bar.
Check test nipple 

 for soundness, otherwise
gas may escape, resulting in a risk of explosion,
asphyxiationor poisoning.
Remove the test equipment:
- Shutdowntheboiler.Closethegasshut-offvalve.
- Pullthehose offandtightenthetestnippleagain.Openthegas
shut-offvalve.
Check the test nipple for soundness, otherwise
gas may escape, resulting in a risk of explosion,
asphyxiationor poisoning.
Connect the test equipment
- The gas fired boiler must be switched OFF. Open the gas
shut-off valve.
- Remove the casing lid.
- Release the plug at test nipple .
- Connect the hose to the pressure test device at test nipple
and check against atmosphere.
- Start the boiler and read off the indicated value.
- Enter the value in the commissioning report.
Nevertake the boilerinto use ifthe actual valuefalls outside
thespecified limits.
→Notifyyour gas supply company.
Gas type Nom.supplypressure Permissiblerange
Natural gas H 20mbar 18*-25 mbar
LPG B/P 50mbar 43-57 mbar
LPG B/P 29mbar 25-35 mbar
* 13 mbar in Russia; this may result in a reduction in boiler output by
up to 2 kW.

17
3062087_0207
Displaying / modifying control parameters
If parameterA09 (frost protection limit) is set lower than the factory setting, frost protection is no longer ensured.
This can lead to heating system damage.
The settings in column 1 apply to control accessories ART, AWT.
The settings in column 2 apply to Wolf control systems with programming module BM.
1 2 Parameters Unit Factory set. Min. Max.
GB 01 HG 01 Burner switching differential K8 525
HG02 Min. modulation current HTG / DHW % 1 1 100
Min.modulationcurrentofthegasvalveforHTG/DHW
HG03 Max. modulation current DHW % 100 1 100
Max. modulation current of the gas valve for DHW
GB 04 HG04 Max. modulation current HTG % 100 1 100
Max.modulationcurrentofthegasvalveforHTG
GB 06 HG06 Pump operating mode -0 01
0 > Pump ON in winter mode
1 > Pump ON during burner operation
GB 07 HG07 Pump run-on time HTG min. 1 0 30
Heating circuit pump run-on time in minutes in htg. mode
GB 08 HG08 Max. flow temperature °C 80 40 90
Applicabletoheatingoperation
GB 09 HG09 Cycle block min 7 1 30
Applicabletoheatingoperation
HG11 DHW quick start temperature °C 10 10 60
Temp.of the plate-type heat exchanger in summer mode
HG12 Gas type -1 01
1 > NG (natural gas)
0 > LPG (LPG)
GB05 A 09 Frost protection limit °C 2 -20 10
withconnectedoutsidetemperaturesensorand
insufficienttemperature> pump ON
HG21 Min.flow temperature for heating operation °C 40 20 60
Modifications must only the carried out by a
recognised heating contractor or by the Wolf
customer service to prevent a risk of injury,
equipment damage and incorrect functions.
NB

18 3062087_0207
Limiting the maximum output
Theoutput setting can be modifiedwith Wolf controlaccessories witheBUS capability viaparameter HG04.
Theheatingoutputwillbedeterminedby the modulation current ofthethegasvalve.Byreducingthe modulation current in accordance
withthe table,themaximum output will be matchedat 80/60°C to natural gas Hand LPG.
0
2
4
6
8
10
12
14
16
18
20
22
24
26
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Output [kW]
Modulation current [%]
Output change CGG-1K-24 G31 / G30 / G20
Output [kW]
Modulation current [%]
Output change CGG-1K-28 G31 / G30 / G20
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Output[kW] 10.9 14 18 22 26 28
I Mod [%] 1 22 38 56 73 100
Output[kW] 9.4 12 15 18 21 24
I Mod [%] 1 22 39 54 69 100

19
3062087_0207
Selecting the pump stage
The boiler is equipped with a three-stage pump that is set to
stage2 in the deliveredcondition.
The minimum circulation volume is ensured by a connection
line between the flow and return.An automatic overflow valve
anda manually adjustablebypass valve areintegratedinto the
connectionline.
In the delivered condition, the bypass valve is fully opened to
"MAX". Closing the valve can increase the residual head (see
diagram).
Fig.: Pump rate stages at the heating circuit pump
Bypassvalve
Stage 1
Stage 2
Stage 3

20 3062087_0207
Selecting the pump stage
Bypass valve fully opened (delivered condition)
Residual head [mbar]
Pump rate [l/h]
0
50
100
150
200
250
300
350
400
450
500
550
600
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
1 2 3
Bypass valve closed
Residual head [mbar]
Pump rate [l/h]
0
50
100
150
200
250
300
350
400
450
500
550
600
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
1 2 3