Wolf MKS 500 Quick start guide

1
Technical Guide
and
Installation Instructions
MKS / MUS Steel boiler
70 - 550 kW
The installation instructions for the Unit pressure jet oil burner is included in the pressure
jet oil burner pack.
The control unit installation and service instructions
included in the control unit pack.
Wolf GmbH · 84048 Mainburg · Postfach 1380 · Telephone [phone] · Fax [phone]
Partno.3048034 03/03 TV GB

2
Suitable for heating systems in accordance with DIN 4751 part 1 and 2 with maximum
flow temperatures up to 120 °C.
Oil- and gas-fired steel boilers
TypeMKS
Oil-fired Unit steel boilers
with two-stage pressure jet oil burner
TypeMUS
Oil- and gas-fired steel boiler for pressure jet combustion in accordance with EN 303
and EC Directive 90/396/EEC (gas consuming equipment), 73/23/EEC (Low Voltage
Directive),89/336/EEC(EMCDirective),92/42/EEC(HotWaterBoilerEfficiency)and93/
68/EEC (Identification Directive) for heating systems with heating circuit pumps and
flowtemperaturesupto110°Cand4barpermissibleoperatingpressureinaccordance
with DIN 4751 and max. DHW cylinder pressure 10 bar in accordance with DIN 4753.
The NOxlimits required by the 1st BImSchV §7(2) are maintained.

3
Specification
Boiler type MUS 85 100
MKS 85 100 140 190 250 340 420 500
Output range oil/gas (MKS) kW 70-100 85-120 110-160 160-230 200-300 280-380 360-460 420-550
Recommended range (MKS) kW 70-85 85-100 110-140 160-190 200-250 280-340 360-420 420-500
Upper range oil (MUS) kW 70-85 85-100 - - - - - -
Setoutput UNIT burnerMUS kW 85 100 - - - - - -
Flue gas temperatures1) from/to °C 145-165 145-165 145-165 145-165 145-165 150 -170 150-165 155-170
1st stage flue gas temperature °C 120 120 120 120 120 120 120 120
Flue gas mass flow rate 1)
FueloilEL CO2=13% kg/h 127-142 142 -168 184-235 269-319 336-420 470-571 605-706 706-840
Flue gas mass flow rate 1)
Natural gas E CO2=9.5% kg/h 125-151 151-178 196-249 285-338 356-445 498-605 641-748 748-890
Flue gas mass flow rate 1)
Natural gas LL CO2=9.0% kg/h 129-157 157-185 203-259 296-351 370-462 517-628 665-776 776-924
Flue gas mass flow rate 1)
LPG CO2=11% kg/h 120-146 146-172 189-240 274-326 343-429 480-583 618-721 721-858
Relative standby loss qB% 0.7 0.7 0.6 0.5 0.5 0.4 0.4 0.3
Total weight MKS kg 406 413 524 730 772 908 975 1035
Total weight MUS kg 426 433 - - - - - -
Boilerdim. Width mm 796 796 796 976 976 1036 1036 1036
Height2) mm 1335 1335 1335 1500 1500 1680 1680 1680
Length MKS mm 1415 1415 1760 1950 1950 2085 2085 2085
Length MUS mm 1825 1825 - - - - - -
Flue pipe Ø mm 178 178 195 195 195 250 250 300
Burner aperture MKS mm 130 130 130 2453) 2453) 3053) 3053) 3053)
Minimumblasttube lengthMKS mm 170 170 170 215 215 125 125 125
Foundation / plinth Height mm 80/80 80/80 80/80 80/80 80/80 80/- 80/- 80/-
Width mm 800/850 800/850 800/850 1000/950 1000/950 1100/- 1100/- 1100/-
Length mm 1360/1300 1360/1300 1700/1500 1850/1500 1850/1500 2000/- 2000/- 2000/-
Boiler flow
(flange) DN 65 65 65 80 80 100 100 100
Safety flow, air-vent valve
(male thread) R 1¼" 1¼" 1¼" 1½" 1½" 2" 2" 2"
Boiler return
(flange) DN 65 65 65 80 80 100 100 100
Filling, draining, safety return
(male thread) R 1½" 1½" 1½" 1½" 1½" 1½" 1½" 1½"
Boiler water content l 216 213 288 508 494 697 665 635
Boiler gas content l 140 143 206 333 346 428 445 460
Heating surface m23.5 3.8 5.2 8 8.4 10.6 12.5 14.2
Flue gas resistance1) mbar 0.3 0.4 0.8 1.1 1.4 2.0 2.0 2.0
Heating water resistance (at Dt=20K)1) mbar 1.2 1.7 3.5 4.5 5.5 9.0 14.0 19.0
Combustion cham. dia. Length mm 808 808 1158 1292 1292 1496 1496 1496
Diameter mm 447 447 447 547 547 588 588 588
Type approval ID 02-226-626
ÖVGW-Reg.-Nr. G2,416
CEdesignation CE-0085AR0034
Electrical connection 230V / 50Hz / 10A
Max. perm. temperature4) °C 120
Max. boiler pressure bar 4
1) At a mean boiler water temperature of 60 °C for the upper and lower output of the recommended range.
2) Including control unit
3) Plain burner plate, drill on-site.
4) Adjustable high limit safety cut-out: 120/110/100 °C at R31 STAV, R32, R33 and R33/4 (not applicable to installations in Austria).
The chimney stack dimensions must be calculated in accordance with DIN 4705, or local regulations. For flue gas temperatures below 160 °C,
combustion equipment must be connected to highly insulated chimney stacks (heat conductivity resistance class I acc. to DIN 18160 T1) or use
suitable, moisture-resistant, type-tested, flue gas systems.

4
These installation instructions apply exclusively to WOLF oil- and gas-fired boilers as
well as to WOLF Unit steel boilers.
Authorised personnel should read these instructions before any installation,
commissioningor maintenance work. Adhere to the instructions given inthis document.
Non-adherence to these installation instructions voids WOLF warranty.
The following symbols and references are used in these installation instructions:
Non-observance of these references can put individuals at risk.
Non-observance of these references can lead to damage to the oil/gas-fired boiler or
the Unit boiler.
In addition to the installation instructions, operating instructions and adhesive labels
are included or fitted to the boiler. These must also be observed.
Observe the enclosed references for heating system installers.
Only qualified and trained personnel may install, commission and maintain these
boilers.
In accordance with VDE 0105 part 1, work on electrical components (e.g. control unit)
may only be carried out by qualified electricians.
The regulations of VDE/ÖVE and those of your local electricity supplier as well as all
other local regulations are apply to electrical installation work.
Only operate the boiler within its output range which is stated in the specification
supplied by WOLF.
Appropriate use of the boiler refers to the exclusive use in hot water heating systems
in accordance with DIN 4751.
Never remove, bypass or otherwise disable any safety and monitoring equipment.
Only operate the boiler in perfect technical condition.
Any faults and damage with a potential impact on safety, which might limit the safe use
of the equipment, must be remedied immediately by a qualified contractor.
Replace faulty components or equipment only with original WOLF spare parts.
The boilers described in these installation instructions are low-temperature boilers
according to HeizAnlV and 92/42/EEC (Hot Water Boiler Efficiency).
In accordance with the Heating System Order, heating systems above 70 kW may not
be operated in single stage mode.
Retain the enclosed operating instructions clearly visible in the boiler room. Insert all
further documentation in a clear wallet and clip to the boiler side casing.
Your boiler and burner should be maintained and cleaned on an annual basis by a
heatingcontractor,to ensurethereliableand economicfunctionofyour heating system.
We would recommend a maintenance contract.
Boilers may only be installed and operated in boiler rooms which are suitable according
to the Landes-FeuVo [or local regulations].
General
Reference symbols
Safety instructions
Standards and regulations
Safety instructions
Please note:

5
Installation references
Positioning
The boiler should be installed on a level surface which is substantial enough to carry
its weight.
It is recommended to place the boiler on a foundation or plinth. For dimensions see
the specification.
During the boiler installation observe all building regulations, the FeuVo and VDI 2050
[in Germany] and local regulations, particularly regarding the size of the boiler room,
the fresh air and exhaust air ventilation as well as the chimney stack connection.
Only install the boiler in boiler rooms which are free from frost and where adequate
ventilation is ensured.
Drain the boiler, the DHW cylinder and the entire heating system if there is a danger of
frost, if the system has been shut down.
Position the boiler horizontally or slightly rising towards the back to ensure adequate
venting of any trapped air.
Boilers should not be installed in areas subject to aggressive vapours or very dusty/
highly humid conditions (workshops, washrooms, hobby rooms etc).
The combustion air must be free from halogenated hydrocarbons (e.g. as contained
in sprays, solvents and cleaning fluids, paints and adhesives) and high dust
concentration.
Clearances towards walls and combustible materials must comply with local fire
regulations. The above clearances are recommended.
Keep the flue pipe connection as short as possible and inclined towards the chimney
stack.
Thoroughly seal-in the flue pipe.
Use flue pipe bends with clean-out covers to facilitate the cleaning of the flue pipe.
Repositioning the fixing screws enables the boiler door to be opened in the opposite
hand.
Please note:
Please note:

6
1 Thermalinsulation: Position (overlapping) around the boiler block and secure with spring clips.
2 Spacers: Secure on the boiler with nuts enclosed.
(MKS-85 to 500) Four spacers at the real panel.
(MKS-85 to 140) Two bottom spacers per side.
(MKS-190 to 500) Three bottom spacers per side and one central top spacer.
3 Thermalinsulation: Loosely fitted to the rear boiler wall.
4 Rearpanels: Centrally locate both parts and secure with self-tapping screws and with the screws (M8x16)
supplied on the rear boiler wall spacers.
5 Thermalinsulation: Insert from the top between door and boiler front and locate on the boiler front.
6 Thermalinsulation: Fit loosely to the boiler front and secure with spring clips.
7 Thermalinsulation: Fit loosely to the boiler front and secure with adhesive strips.
8 Sidepanels: Push the l.h./r.h. casing over the rear panel and secure with the screws
(MUS-85 to 100 / MKS-85 to 140) (M8x16) supplied to the lower two spacers.
8 Sidepanels: Secure the l.h./r.h. front and rear panels with screws (M6x10) then push over the rear panel
(MKS-190 to 500) and secure with the screws (M8x16) supplied on the lower three spacers.
9 Wolflabel: Hook into the front panel lid (10).
10 Frontpanellid: Locate and click into the panel with fitted control unit.
Onlycompletethe fitting ofthe casing after thecontrol unit hasbeeninstalled (page 7).
10 Panellidl.h.rear: Locate on the panel and click into place.
10 Panellidr.h.rear: Locate on the panel and click into place.
13 Typeplate: Affix to the boiler in a clearly visible position.
Accompanyingdocumentation: Affix with the clips supplied to the side of the boiler.
Casing installation
Burner cables
1st stage
2nd stage
Boiler sensor
Control unit cable

7
Control unit installation
High limit safety cut-out
Ensure, during the control unit installationthat the sensor capillaries are not kinked or
twisted and have only been pulled out of the boiler casing as far as necessary.
Do not route on-site cables for outside temperature and flow temperature sensors
together with mains power cables.
Electrical wiring in accordance with the wiring diagram enclosed.
Ensure that cables which are not required are secured against contact.
R31-STAVcontrolunit
Control accessories
Please note:
Installation and electrical wiring according to the wiring diagram supplied with the
control accessories.
If Wolf boilers are equipped with control units not supplied by Wolf or if technical
modifications are carried out on Wolf control units, Wolf will not be liable for any
consequential losses which may occur.
The high limit safety cut-out (STB) is factory-set to 120 °C.
Change the setting of the STB, if required.
Such changes are irreversible.
Disconnect the control unit from its power supply.
Remove the control unit lid with a screwdriver.
Unscrew the plastic cap and locking nut.
Remove the high limit safety cut-out.
Adjust the setscrew in accordance with the scale.
Install in reverse order.
Changingthesettingofthe highlimit
safety cut-out (STB) for R31-STAV
Observe the respective installation and operating instructions for
R32, R33 and R33/4 control units.
Burnercable 1st stage
2ndstage
Boilersensor
Mainssupplycable
Heatingcircuitpumpcable
Loadingpumpcable
DHWcylindercable
Adjustingtheboiler thermostat If necessary, the boiler thermostat can be adjusted from 80 °C to 90 °C. To do this, turn
the boiler thermostat clockwise to its end-stop (80 °C); pull out the rotary selector approx.
3 mm and continue to turn clockwise to its end-stop (90 °C).
Please note: The boiler thermostat must not be set to 90 °C if the high limit safety
cut-out has been adjusted to 100 °C.
Controlunit
Guide the cable through the casing lid cut-out, and secure the control unit housing on
the casing lid with the self-tapping screws supplied.
Guide the burner cables
through the boiler front cut-out.
Push the boiler sensors
in any order into the boiler sensor well.
Guide the mains supply cable, and the heating circuit pump cable
through the boiler back cut-out.
Guidetheloadingpumpcable
(for DHW cylinder connection accessories) through the boiler back cut-out.
Guidethe DHWcylindercable
(for DHW cylinder connection accessories) through the boiler back cut-out.
Please note:

8
Installation / maintenance
Connections
Venting
Safety flow
Flue pipe connection
Draining, filling
Boiler flow Boiler return
Connect the heating flow and return to the respective boiler fittings. For connections,
see above.
Install a check valve behind the boiler circuit pump(s) to prevent incorrect circulation.
Install a safety equipment assembly.
The pipework between the boiler and the safety valve must not be able to be shut off.
Connect underfloor heating via a four-way mixer.
Provide system separation by means of a heat exchanger, when using pipes which are
not impermeable to oxygen.
The boiler and central heating system may only be filled, if a type-tested safety valve
(opening pressure max. 3 bar) has been installed at the "ventilation“ connection of the
boiler.
Install a filling/drain valve to fill the central heating system at the "drain, filling“
connection, and connect a water hose.
Observe the pressure gauge in the safety equipment assembly when filling the system
with water.
Check the safety valve function.
Ventilate the boiler (automatic air-vent valve).
Shut down the heating system and let it cool down.
Open the drain valve on the boiler.
Open the radiator bleed valves.
Pipework
Centralheatingboiler
Fillingtheheatingsystem
Draining the heating system
Please note:

9
tKmin = min. boiler temperature
tRmin = min. return temperature
Please note: A weather-compensated control unit is equipped with soft boiler start, which prevents condensate being formed
during the start-up phase.
System Fuel Oil Gas
Control unit R31, R32 R31, R32
R33, R33/4 R33, R33/4
Radiator central heating tKmin °C 38 50
less than 20l/kW tRmin °C 30 40
Design 80/60 Return temp. raising 1-3 2/3
acc. to sys. example
Low-temp. central heating tKmin °C 38 50
with less than 20l/kW; tRmin °C 30 40
Design temperature Return temp. raising 1-3 2/3
55/45 and above acc. to sys. example
Systems with more than tKmin °C 38 50
20l/kW underfloor/ tRmin °C 30 40
low-temp. central heating
Design temperature Return temp. raising 2/3 2/3
under 55/45 acc. to sys. example
Minimum return temperatures To prevent falling below the dewpoint, the following measures for raising the return
temperature are required in order to maintain the minimum temperatures tRmin listed
in the table.
Sizingshuntpump The flow rate of shunt pump V is calculated according to the following formula:
QNx 3600
V = in m3/h
cpx∆txρW
V = Shunt pump volume flow in m³/h
QN= Rated boiler output in kW
cp= Specific energy 4.2 kWs/kgK
ρW= Specific weight of water 1000 kg/m³
∆t = Temperature differential between the flow temperature and bypass
temperature (recommended design temperature differential 30k)
The shunt pump head results from the boiler pressure loss at the selected volume
flow, the pipework pressure loss as well as all individual boiler circuit pressure
losses.
A return temperature limit stat T switches the shunt pump ON, when the permissible
return temperature is no longer maintained.
A return temperature limit stat T1 switches the shunt pump ON, when the minimum
return temperature is no longer maintained.
If the return temperature falls further, the return temperature limit stat T2 signals to
the control unit R, which throttles the heat transfer via one or several mixers M in the
heating circuit.
A return temperature limit stat T regulates a distribution valve M, so that if the
permissible return temperature is no longer maintained, the heating circuit flow will
be partially or fully closed.
After the boiler has been heated up, the distribution valve M will open as wide as the
permissible return temperature requires.
The distribution valve M, can also be installed as mixer into the return.
System example
Minimum return temperatures /
return temperature raising facility

10
MKS MUS
Type 85 100 140 190 250 340 420 500 85 100
Output range kW 70-100 85-120 110-160 160-230 200-300 280-380 360-460 420-550 70-85 85-100
Min. boiler output
burner stage 1 kW 51 60 84 114 150 204 252 300 51 60
Fill water / burner connection
Fillwater Water guidelines for heating systems in accordance with VDI 2035 at operating
temperatures up to 100 °C:
Burnerconnection Observe the TRD 411 (oil combustion) and TRD 412 (gas combustion) guidelines.
The gas installation and operation of heating systems must comply with the DVGW
Code of Practice "Gas" and the technical connection conditions of your gas supply
company and/all local regulations.
Burner size MKS-85-140 Acc. to EN 226 adjustable to burner size
connection MKS-190 - Burner plate in acc. with blast tube dia.
MKS-500 cut-out and tap thread.
Match the door insulation to the blast tube diameter of the burner.
The blast tube must protrude into the combustion chamber at least 25 mm beyond the
door installation.
Use fixing screws for the burner flange, which cannot the inserted into the boiler
door more than 15 mm.
Connect the ventilation fitting at the sight glass with the burner fitting.
After the control unit installation, plug the burner cable into the burner.
Ensure that the combustion output matches the rated boiler output.
Observe the details provided by the burner supplier.
To prevent the system falling below the dewpoint, the following minimum boiler output
for two-stage burners are required for the first stage:
Minimumboileroutput
*) for exceptions see VDI 2035
(+) may be required, see VDI 2035
Water guidelines for heating systems in accordance with VdTÜV guidelines at
operating temperatures above 100 °C:
Filling and
top-up water Circulating water
Residual hardness
mval/kg pH value Diamide Na2SO3
p value
mval/kg
<0.03 0.5-1.5 8.5-10.0 0.5-25 10-40
Group Total of rated
boiler output Q Filling and top-up
water Heating water
Total alkaline
earths in mol/m³ pH value Diamide Na2SO3
Excess in mg/kg
0Q≤ 100 -*) - - -
1 100 < Q ≤ 350 1 to 3 8 to 9.5 - -
2 350 < Q ≤1000 1 to 2 8 to 9.5 2 to 5(+) 5 to 20(+)
kW
Excess in mg/kg

11
Electrical connection
Mains power connection 230V 50 Hz 10 A
To the control unit
Heating system
emergency
stop switch
(on site)
Heatingcircuitpump(s) / return shuntpumpconnection
Return limit thermostat
Heating circuit
pump on-site
Return
shunt pump
Burner two-stage without socket part
Burnerplug
plug into the
control unit Burner plug on the
control unit
Burner with socket part
Burner socket part Burner socket part
1st stage 2nd stage
Connection for on-site safety equipment
To the control unit To the burner
Terminals for
low water indicator
Terminals for
safety pressure
switch
Control unit
junction box Terminals for
remote pressure
monitoring
Burnerconnection
To the control unit To the control unit
ye/gn
PE bl
N
br
L1
PE L 1 N
br
L1
bl
N
ye/gn
PE
blk ye/gn blu br w gr r 2 3 4 1
blk ye/gn bl br w gr r
To the control unit
Remove the burner plug from the control unit, connect the black to
the brown core and connect the white core to the burner phase.
Electricalconnection Connect the heating circuit pump(s), the return shunt pump and the DHW cylinder
loading pump(s) on-site via contactors, if:
- three-phase pumps (400 V) are connected.
- burner and pump draw more than 2 A each.
- the total control unit power consumption is exceeded.
3 x 1.523 x 1.02
7 x 1.024 x 1.02
y
blk
blk
yblk y
y
blk
7 x 1.024 x 1.02

12
Safetyequipment
Expansion vessels of sealed heating systems are provided with a standpipe as safety
equipmentinaccordance with DIN4750ora safety valveinaccordancewith TRD 721.
Install an expansion vessel compliant with DIN 4807 T2 for each boiler system at its
highest point.
A thermometer with sensor well is fitted to the flow of each boiler.
Each boiler is equipped with a water level indicator which is visible from the boiler
control position, which enables the static pressure of the heating system to be
checked that any time.
Mark the lowest permissible water level on the water level indicator.
The pipework between the boiler, the expansion vessel and the safety valve must not
beable to be shut off. A valve which has been protected against unauthorised closure,
e.g. a cap valve, would also be acceptable.
Thesystemdiagramonlyindicatesthesafetyrequirementsbutisnotarecommendation
for specific types of heating network control.
Fresh air
ventilation/
exhaustion
Cap valve
Safety valve
Expansion vessel
Test line
Heat consumer
Shut-off valve
Boiler fill and
drain valve
Safetyvalve
Expansion vessels
Thermometer
Water level indicator
Please note:
Thermometer
Safety equipment
acc. to DIN 4751 part 1
Scope:
Open and sealed, physically
protected heat generator systems
with flow temperatures up to 100 °C.

13
Safetyequipment
Safety equipment
acc. to DIN 4751 part 2
Scope:
Sealed, thermostatically
protected heat generator systems
with flow temperatures up to 120 °C.
Thermometer
Heat. circ. pump
Safety valve
Pressure
gauge
Heat consumer
External pressure
monitoring
Fresh air
ventilation/
exhaustion
Cap valve
Expansion vessel
Drain valve
Minimumpressure
switch
Boiler fill and drain valve
Every boiler must be protected against exceeding the permissible operating pressure
by a diaphragm safety valve or other spring-biased safety valves. Safety valves must
comply with TRD 721. A maximum of three safety valves may be applied to each heat
generator. A flash trap must be installed immediately next to each safety valve for
boilers with a rated output in excess of 350 kW. The installation of flash traps is not
required for hot water heating systems, if each heat generator is equipped with one
or an additional STB and one or an additional pressure switch.
Sizes and internal diameters of diaphragm safety valves, dimensions of supply lines
and blow-off lines.
Safetyvalve
Diaphragm
safetyvalve Blow-off output in kW 50 100 200 350 600
Size, internal diameter, DN 15 20 25 32 40
Fitting thread for supply line G½" G ¾" G 1" G 1¼" G 1½"
Fitting thread for blow-off line G ¾" G 1" G 1¼" G 1½” G 2"
The water and gas chamber of pressure expansion valves must be calculated in
accordance with DIN 4807 part 2.
If the permissible operating pressure is lower than the highest working pressure of
the pressure dwell valve, protect the expansion vessel by suitable type-tested safety
valves against excessive pressures. Size open expansion vessels for a minimum
pressure of 2 bar.
Arrange all expansion vessels with shut-off facilities towards the heating system.
Ensure that the shut-off equipment is sufficiently protected against unintentional
closure (e.g. cap valve protected with a wire and seal).
Equip each boiler with a type-tested low-water indicator. A low-water indicator is not
required for boilers up to 350 kW, since excessive heating at low water conditions is
prevented.ThiswasverifiedaspartofthetypetestingoftheSTBinstalledinthecontrol
unit.
Expansion vessels
Low water indicator
Open flash trap
Lowwater indicator
Maximum pressure
limiter

14
Install a temperature indicator and a facility for checking the flow temperature into the
boilerflowline,sothat the actual heating water flowtemperaturecanberecorded.The
permissible flow temperature must be permanently marked on the display scale.
The boiler must be equipped with a pressure gauge with immediate connection to
the water chamber or in immediate proximity of the flow, as well as a suitable
connection for the pressure testing device according to DIN 16263 or DIN 16271. The
response pressure of the boiler safety valve and the minimum system pressure must
be permanently marked on the display scale.
Equip every boiler, which is protected above 3 bar or which has a rated output higher
than350 kW, with a maximumpressure switch (type-tested according to VdTÜV Code
of Practice Issue 100/l).
Monitor the operating pressure of hot water heat generator systems with a minimum
pressure switch, type-tested in accordance with the VdTÜV Code of Practice Issue
100/I, in order to prevent water evaporating inside the heating system as a result of
insufficient external pressure.
Install a check valve downstream of the boiler circuit pump to prevent incorrect
circulation.
The pipework between the boiler, the safety valve and the low-water indicator must
not be able to be shut off.
Thesystemdiagramonlyindicate thesafetyrequirements,but isnotarecommendation
for specific types of heating network control.
Thermometer
Pressure gauge
External pressure monitoring
Please note:
Safetyequipment

15
Approximate sizing of
chimney cross-sections
Approximatecalculation:
Circular cross-sections
Rated output in kW
Required chimney size
in cm x cm
Effective chimney height in m
Effective chimney height in m
Rated output in kW
Please note: We recommend that you let your chimney manufacturer design the chimney.
Square cross-sections
Required chimney diameter
incm

16
Part numbers
1 Thermal insulation
2 Spacers
3 Thermal insulation
4 Back panels
5 Thermal insulation
6 Thermal insulation
7 Thermal insulation
8 Side panels
9 Wolf label
10 Front panel lid
11 Left-hand rear panel lid
12 Right-hand rear panel lid
13 Type plate
MKS
Steel boiler MKS / MUS 70 up to 550 kW Part no. 85 100 140 190 250 340 420 500
Packing cord for boiler door, 3200 mm long 16 41 401 X X X X X X X X
Gasket for clean-out aperture 39 03 000 X X X X X X X X
Flat seal/flue gas collector box to approx. 3rd quarter of ’98 16 08 015 X X X - - - - -
Flat seal/flue gas collector box to approx. 3rd quarter of ’98 16 08 016 - - - X X - -
Flat pack./flue gas collector box to approx. 3rd quarter of ’98 16 08 017 - - - - - X X X
Sight glass flat packing 39 01 040 X X X X X X X X
Cleaning brush 24 40 240 X X - - - - - -
Cleaning brush 24 40 241 - - X - - - - -
Cleaning brush 24 40 242 - - - X X - - -
Cleaning brush 24 40 243 - - - - - X X X
Sight glass 24 00 125 X X X X X X X X
Sensor well (up to model M 2850) 45 00 150 X X X X X X X X
Sensor well (from model M 2851) 24 25 070 X X X X X X X X
Turbulators 89 00 150 X X - - - - - -
Turbulators 89 00 151 - - X - - - - -
Turbulators 89 00 152 - - - X X - - -
Turbulators 89 00 153 - - - - - X X X
Jamb brick 16 10 415 X X X - - - - -
Jamb brick 16 10 416 - - - X X - - -
Jamb brick 16 10 417 - - - - - X X X
Casing and insulation from approx. 3rd quarter of ’98 89 00 557 X X - - - - - -
Casing and insulation from approx. 3rd quarter of ’98 89 00 561 - - X - - - - -
Casing and insulation from approx. 3rd quarter of ’98 89 00 562 - - - X X - - -
Casing and insulation from approx. 3rd quarter of ’98 89 00 570 - - - - - X X X

17
Fault Cause Remedy
Burner does not start No voltage present Check fuse, electrical connections, position of ctrl.unit,
or enters fault state ON/OFF switch and heat. system emerg. stop switch
Oil tank empty / Fill oil tank /
Gas supply line shut off Open gas supply line
Burner fault Press the reset button at the boiler control unit
(see burner installation instructions)
High limit safety cut-out Press the reset button on the control unit.
has switched OFF
Oil filter clogged Replace oil filter
Heating circuit System in summer mode Check summer/winter switch position
pump does not start Heating circuit pump locked up Turn the pump shaft with a screwdriver
Heating circuit pump faulty Replace the heating circuit pump
Cylinder loading pump DHW cylinder thermostat faulty Check the DHW cyl. thermostat and replace, if nec.
does not run DHW loading pump locked up Turn the pump shaft with a screwdriver
Cylinder loading pump faulty Replace the DHW loading pump
The heating system operates, Maximum boiler temperature Raise maximum boiler temperature.
but room temp. too low set too low
Troubleshooting

18
Notes

19
Notes

20
Declaration of Conformity
inaccordancewiththe97/23/ECPressureDeviceDirectiveAppendixVII
Product designation: Steelboiler
type MKS, MUS
Appliedconformity ModuleB+C1
assessment procedure:
Name and address TÜVSüddeutschland Bauund BetriebGmbH
of the named body: Westendstraße 199
80686Munich
ID of the named body: CE0036
Applied standards TRD702
and specifications: DINEN297and656
We,WolfGmbH,Industriestraße1,84048Mainburg,herebydeclarethattheaboveboilercomplieswiththeappropriateregulations
laid down in the 97/23/EC Directive, when the safety temperature has been set to > 110 °C.
This declaration loses its validity, if the product is modified without our express permission. Observe the safety instructions in the
documentation and the operating instructions.
Mainburg,11.06.2002
pp. Steppe