Mytherm RS Series Guide

TECHNICAL MANUAL AND USER’S INSTRUCTIONS
GAS / OIL STEELBOILERS
Series RS

Dear customer,
Thank you very much for your preference for selecting Mythem “GAS / OIL STEEL BOILER, SERIES
RS” from other products available on the market, as well as, for your confidence in the Mytherm
industry.
Please read this manual carefully before installing and using the unit and follow the recommendations and
instructions that apply to it.
Mytherm
Industrial area ofSindos
B.B. 49, Entrance D
57022Thessaloniki
GREECE
Telephone: [phone]
Fax: [phone]
E-Mail:[email protected]
www.mytherm.gr

Long lasting steel boilers of high efficiency, series RS
*picture of 30 kw model
Boilers RS made of steel St 37-2, with seamless tubes from steel St 40, three routes exhaust and
horizontal construction. This unique design passes the hot combustion gases three times through the
boiler under negative pressure. This maximizes the gases contact with the boiler's water transfer surface
area. The result: High Efficiency, Burns Clean, Zero Smoke
The design and the generally excellent workmanship demonstrated for several decades both in practice
and testing laboratory control (for obtaining the European mark of conformity CE) their high efficiency
class with more than 91%. It has a certificate type EK(92/42/EOK).
The perfect combustion enable us to offer a technologically high-quality boiler.
They are made of special steel sheet ST 37-2 1N17100
Combustion chamber with seamless tubes (Mannesman) with three-way exhaust gas
turbulators
Thermal insulation of fiberglass and aluminumcoating
Set of painted covers–electrostaticpainting
Combined with operation controlpanel
Easy to Maintain
The front open door , together with the back exit of the exhaust
gases, provides instant access to all of the boilers' interior surfaces.
All service and cleaning can be completed easily and fast, creating additional savings.
A clean boiler is a more efficient boiler.

●Thistechnicalmanualispartoftheindividualunitthatyoupurchased.Itisaddressedto
thetechnicianswhowillinstalltheunitaswellastotheenduserwhowilluseit.Pleaseread the
instructions carefully before you start on the unit. You must keep this manual in a
secureplaceforfutureuse.
• Iftheowneroftheunitwillbechangedortheuseroftheunit,makesurethatyouhave
beeninformedofthistechnicalmanual.
Thissignalindicatesprocedureswhich,ifexecutedincorrectly,cancause injury
or propertydamage.
• Installationshouldonlybecarriedoutbyqualifiedtechnicians.
• Installationoftheunitmustbecarriedoutinaccordancewiththismanualandthe
manufacturer'sinstructions.
• Observethemanufacturer'sinstructionsfortheoilburner
• Incorrectorimproperinstallationmayresultinpersonalinjuryorpropertydamage.The
Companydeclaresthatithasnoliabilityintheeventofdamagecausedbyincorrector
incorrectinstallationorfailuretofollowtheinstallationinstructions.
• Atleastoneannualinspectionandservicebyaqualifiedtechnicianisrequiredtomaintain
theinstallationinaccordancewiththespecificationsandtheinitialsetting.
• Incaseofleakageoftheunit,callanauthorizedtechnician.Anypartsreplacementofthe
unit must be done using original spare parts.
• Beforeanycleaningormaintenanceworkontheunit,theelectricalsupplyofallappliances
connectedtotheboiler(burner,pump,etc.)mustbeinterruptedbyclosingtheunitON / OFF switches.
• Duetothecontinuousimprovementoftheproduct,thedatapresentedinthismanualmay
differslightlyfromtheactualproduct.
NOTES

E.U. DIRECTIVES
Thefollowingdirectivesandstandardsaremetduringtheconstructionoftheunit:
1. Directive92/42/EECPerformancerequirementsfornewhot-waterboilersfiredwithliquid or
gaseousfuels.
2. Directive2014/30 / EUDirectiveonelectromagneticcompatibility.
3. Directive2014/35 / EUDirectiveonelectricalequipmentintendedforusewithincertain voltagelimits.
4. Directive2009/125 / ECEcodesignrequirements.
5. Regulation813/2013EcodesignRegulations.
6. EN303-1Heatingboilers-Part1:Heatingboilerswithforceddraftburners-Terminology,
generalrequirements,testingandmarking.
7. EN303-2Heatingboilers-Part2:Heatingboilerswithforceddraftburners-Special
requirementsforboilerswithoil-firedburners.
8. EN303-4Heatingboilers-Part4:Heatingboilerswithforceddraftburners-Special
requirementsforforceddraftboilerswithapayloadofupto70kWandamaximumoperating
pressureof3bar-Terminology,specialrequirements,testingandmarking.
9. EN304:1992Testcodeforheatingboilersforoilburnerswithmechanicalsprayingoffuel.
10. EN267Monoblocktypepressurizedboilers-Tests.
11.EN60335-1,Safetyofhouseholdandsimilarelectricalappliances.
12. EN 60335-2-102 Safety of household and similar electrical appliances. Special requirements
for gas, oil or solid fuel combustion appliances which have electrical connections.
13. EN 55014-1, EN 55014-2 Electromagnetic compatibility - Requirements for household
appliances,powertoolsandsimilardevices.
EC DECLARATION OF CONFORMITY, CE
ThisproductconformstoitsconstructionandoperationwiththerelevantEUdirective
s. The product features and assembly conditions are described in this
manual.
TheECdeclarationofconformityisavailablebye-
mailtotheMYTHERMindustryat : export@mytherm,.com

CONTENTS
No
DESCRIPTION
PAGE
1
General Information
3
1.1
Proper use
3
1.2
Safety warnings
3
1.3
Data Label
3
1.4
Document information
3
2
Technical characteristics
4
2.1
Technicalfeatures
4
2.2
Function
4
2.3
Working
5
2.4
Technical characteristics RS series
6
2.5
Fuel
7
3
Boiler Mounting
7
3.1
Transportation and delivery
7
3.2
Boiler Room
8
3.3
Chimney
10
3.4
Typical installation
11
4
Expansion vessel
11
5
Safetyfeatures
12
6
Returned Temperatureprotection
12
7
Filling the system
12
8
Central heating installation overview
13
9
Generalinstructions
14
10
Service
15
10.1
Cleaning the boiler
15
10.2
Cleaning the chimney box
15
10.3
After long stop
16
10.4
Basic service
16
11
Troubleshooting
17
12
Warranty
18

3
1. GENERAL INFORMATION
1.1. Proper use
Before you make use of this appliance make sure you have read and fully understood the
instructions included in this manual.
The installation and use of the appliance must be performed according to the instructions
indicated in this manual in combination with the current national safety regulations.
The appliance is designed for use in pumped hot water central heating systems. Any other use
is considered improper and is prohibited. MIK EUROPE PC declines any responsibility for
damages or injuries caused by improper use, in this case the risk is completely at the user’s
responsibility.
To ensure an efficient and flawless function of the appliance, it is strongly recommended that
you have performed an annual service by a qualified technician.
1.2 Safetywarnings
All installation and maintenance procedures must be carried out by professional and authorized
personnel, in compliance with the indications in the present manual and national regulations.
Any failure to correctly install this appliance could cause damage or injuries!
Do not make modifications to parts of the appliance, unless you have contacted the company
and an authorized service contractor.
Only original accessories and spare parts must be used to ensure correct and safe function.
Make sure you respect the cleaning and maintenance procedures on the corresponding
intervals. Failure to do so can cause malfunction to the appliance and possible damages.
The boiler is design to function on the fuels indicated in the corresponding paragraph. Any
other fuel is prohibited. Do not use explosive or flammable substances! Do not store such
substances inside the boiler room.
The working pressure varies according to the model. Make sure you use the appropriate water
pressure. Working in a pressure higher than the one indicated in this manual is
strictly prohibited anddangerous!
1.3 Datalabel
The data label of the appliance is placed on the boiler’s side cover, on the external part. Make
sure that it is properly placed and readable.
On the label it is indicated the serial number and the manufacturing year of the appliance.
1.4 Documentinformation
This document is an integral and indispensable part of the product and must be retained in
good condition by the user. Keep it in a safe place for future reference.
If the appliance is sold or transferred to another person, this manual has to always follow the
appliance and handed to the new user or installer.

4
2. TECHNICAL CHARACTERISTICS
2.1 Technicalfeatures
The RS boiler is made of steel, as a monobloc construction, with horizontal tubed heat
exchanger and pressurized fire chamber. It functions on the principle of reversed flame, with
three passes of burned gases: two passes in the combustion chamber and one pass in the
exhaust tubes. The heat transfer is performed through radiation at the first two passes and
through conduction at the third pass of the tubes.
It is appropriate for light oil combustion and gas combustion.
The boiler is designed for maximum working temperature of 95oC.
DESCIPTION OF COMPONENTS
 Steel boiler body with horizontal tube exchanger
 High efficiency stainless steelturbolators
 Removable rear smoke box with inspection cleaningdoor
 Front door insulated with refractory material, equipped with a flange for burner mounting
and a flame inspectionpipe
 Rockwool body insulation of 50 mm up to 100 mmthickness (depends the model)
 Electrostatically painted externalcovers
 Control panel for electromechanical operation(optional)
2.2 Function
Pic 1. Boiler function
*according the model IN-OUT connections can be different
The function of the boiler is based on the counter-pressure that is created by the returnable
flame in the combustion chamber and by the transmission of heat with radiation. The burned
gases reverse their course at the bottom of the fire chamber, surrounding this way the flame,
which does not get into immediate contact with the surrounding walls.
The burned gases are then guided towards the smoke box through the fire tubes where the
heat transfer is mainly through conductivity, and afterwards evacuated to the chimney. The
smoke box is equipped with an inspection and cleaning door, which also actions as an
explosion relief. The turbinators in the tubes create turbulence to the burned gases, so as to
get into a continuous contact with the walls of the tubes and increase the heat transfer
efficiency.

The results a complete and perfect combustion with a small excess of air, and uniform heat
charge of the surfaces.
The door has an insulation cord to ensure air-tight closing. The door is equipped with a flange
for burner mounting and an inspection eye for flame inspection.
2.3 Working
The maximal temperature of the water is 95ºC. The minimal temperature of the return water is
65ºC for nominal decrease of temperature ∆t=20ºC in a device of heat performance.
The boiler is appropriate for open and closed heating systems with maximal operation pressure
4 or 6 bars according the model. The maximal operation pressure of the boilers with power
bigger than 455 kW is 6 bars.
The quality of the heating plant water is an important element for the performance of the
system. The water that enters the heating plant must be clean, transparent and free from salts
and chemical substances. It must be filtered, so as no quantity of sand or mud from the water
supply comes into the boiler.
The hardness of the water must be within permissible limits. In regions where the water is
hard, it is necessary to use water softeners.
Properties of the water for use:
 Appearance: clean-transparent
 Total hardness: Max20ºf
 Free oxygen: Max 0,05mg/lit
 Organic substances: Max 0,5mg/lit
 PH: min8,5
5

2.4 TECHNICAL CHARACTERISTICS RS SERIES
Hot water , steel boilers, Series RS is in conformity with the European directive 92/42/EEC and it
is tested and examined with the norm EN 303-3
TYPE
KW
HYDRAYLIC
CHIMNEY
WIDTH
LENGTH
HEIGHT
WEIGHT
kw
Inch.
mm
mm
mm
mm
kg
30
30
1 1/4''
140
610
820
710
118
40
40
1 1/4''
140
610
920
710
140
50
50
1 1/4''
140
610
1020
710
162
60
60
1 1/4''
140
610
1170
710
182
70
80
2''
180
720
1100
840
273
90
100
2''
180
720
1200
840
293
110
120
2''
180
720
1300
840
313
130
140
2''
200
720
1350
840
322
150
160
2''
200
720
1550
840
367
180
180
2''
200
880
1400
1030
486
210
200
2 1/2''
250
880
1500
1030
514
250
250
2 1/2''
250
880
1600
1030
544
290
300
3''
250
880
1650
1030
563
340
350
3''
250
980
1650
1080
693
400
400
3''
300
980
2000
1080
805
465
455
4''
300
980
2200
1080
844
540
520
4''
300
1200
2150
1280
998
610
600
4''
300
1200
2350
1280
1078
700
700
4''
350
1300
2350
1350
1356
800
800
4''
350
1300
2450
1350
1401
1000
1000
4''
350
1300
2450
1350
1450
CE
The working pressure is :
•4 bars up to 400 kWand
•6 bars from 455 up to 1000 kWboilers
(Higher working pressure is possible under your specific construction demands)
 High efficiency, over 92%
 Temperature of the gases evacuated on chimney, 190-2300C
 Compatibility with any gas/ oil fuel pressureburners
OPTIONAL :
Control panel for one/two stages burners, with :
 ON/OFFswitch
 ON/OFFlamp
 Water’sthermostat
 Pump’sthermostat
 Safety thermostat(distance)
6

2.5Fuel
The RS boiler is designed for function with the following fuels:
1. Natural Gas, according to DIN 4756 and 4788, with lower calorific power 8.500 kcal/Nm3.
The delivery conditions of natural gas to the burner are stabilized by the Norm for natural
gas I 6-98, for gas with low pressure (p=500mmCA)
2. Light oil fuel, according to DIN 4755 and 4787, with a viscosity of 4, 5 cSt at 20oC and
lower calorific power 9.900kcal/kg.
3. Light oil fuel with lower calorific power 9.650kcal/kg.
No other fuel than the ones mentioned should be used with this boiler! If you
wish to use an alternative fuel, please contact themanufacturer.
When liquid fuel is used, pay attention at the following:
When filling the fuel tank, avoid any water or dust entering together with the fuel in the tank.
When the room temperature of the location where the boiler is mounted is lower than 0oC, it is
recommended the use of a pre-heater.
3. BOILER MOUNTING
Transportation anddelivery
The boiler is delivered complete with the metal covers, well packaged. The loading and
unloading of the boiler must be performed with a forklift or a crane. A special hook is provided
on the upper part of the boiler for lifting.
The boiler is heavy. Do not try to lift by hands or other unsuitable equipment.
Danger of injury! Perform all moves with extreme attention and care.
Remove the boiler packaging with attention. Keep the packaging material away from
children since it can be dangerous. After having unpacked everything, make sure that the
appliance is intact and undamaged. In case of doubt do not use the appliance and inform the
supplier.
The RS boiler is delivered with the following equipment already fitted and mounted:
 Boiler steel body
 Rockwool insulation mounted on the boiler body and tightened with plastictapes
 Metal covers mounted on the boilerbody
 Turbinators positioned inside the firetubes
The following accessories are positioned inside the boiler body. Remove them carefully by
opening the middle door.
 Cleaningtools
 Drainagevalve
 Control panel(optional)
In the documentation folder you will find:
 Technicalmanual
 Warrantyleaflet
 Declaration of conformity
7

Boilerroom
Generalrequirements
The boiler must be installed in a special and separate room. This room must be chosen so that
it offers easy access for fuel transport, air supply and exhaust gas evacuation. The doors of the
boiler room must be metallic, open outwards, and have at least 0,9 m width.
The boiler installation is prohibited in rooms with extensive dust, dangerous
gases, and moistspaces.
For the correct boiler function it is necessary that the boiler room has openings for natural
ventilation and combustion air supply. It is recommended that two different openings are used
for this purpose, positioned on opposite walls and diagonally to ensure good air circulation. The
cross section of the openings can be estimated by the following formula:
F=Q*8 /1000
Where F=Surface of the opening in cm² (with grid)
(Without grid by receiving 2/3 of the F)
Q=Heating power of the boiler in kcal/h
The boiler room must be provided with a drainage channel. All safety devices must be
connected to this channel.
The boiler room must have an appropriate fire extinguishing system, according to the
regulations in force. In case that the building is designed with a fire alarm system, a smoke
detector must be positioned on top of every boiler.
The fuel storage is prohibited in the boiler room. If so, the storage must be separated from the
boiler with a non-flammable wall, and proper distanced from the boiler.
8

1... Boiler room dimensions
The boiler must be placed on a horizontal plane, with adequate mechanical resistance to
support the boiler’s weight. The boiler must be positioned in the room in such a way so that it
is easily accessible from all the sides. The following dimensions are recommended (see Fig 3):
Distance from the front wall (N):
For boilers up to 100 kW –minimum 1,5 m
For boilers bigger than 100 kW –minimum 2 m
Distance from the rear wall (L):
Appropriate distance for maintenance access. Minimum 0,6 m.
Distance from side walls (M):
For boiler up to 300 KW –minimum 0,6 m
For boilers bigger than 300 kW –minimum 1 m
Boiler room height (H):
For boilers up to 70 kW –minimum 2 m
For boilers 70 to 230 kW –minimum 2,4 m
For boiler 230 to 400 kW –minimum 3m
For boiler bigger than 400 kW –minimum 3,5 m
Distance between two boilers (P) must be at least 1m.
9

Chimney
The chimney installation must supply sufficient draught, air tightness and protection against
condensation.
The appropriate chimney installation is very important for the boiler’s efficient
and safefunction!
The chimney must be positioned in the interior of the building. It must be vertical, with no
changes in the direction. The cross-section of the chimney can be round or rectangular. If the
chimney is installed in the exterior, it must beinsulated.
The horizontal part connecting the boiler’s chimney pipe with the vertical chimney must have
maximum length 2 m. If this distance is bigger, it is recommended to have a 15-30oinclination
upwards. The connection with the boiler’s chimney pipe must be air-tight.
The chimney must be equipped with a cleaning door at its base. Also cleaning doors are
recommended where there are changes in direction and ash can be accumulated. Tactical
cleaning is recommended (every 3 months) for efficient boiler function.
A chimney terminal must be installed at the end of the chimney for protection against weather
effects and foreign objects entrance. In areas with strong winds a special anti-downdraught
terminal is recommended.
The chimney height must exceed the roofline by at least 1 m. If there are other obstacles
positioned on the roof, the chimney height must exceed them by at least 1 m. If there are
multiple chimneys, minimum distance between them is 0,3m.
Each boiler should be connected to an independent chimney. Connection of multiple boilers to
the same chimney is not recommended.
10

3.4 TYPICAL INSTALLATION
Legend
1.
Burner
2.
Control panel
3.
Manometer
4.
Safety kit
5,7,8.
Safety valve
6.
Air relief valve
9.
Drainage valve
10.
Ball valve
11,13,15.
Pump
12.
One-way valve
14.
Expansion vessel
4. Expansion vessel
The RS boiler is recommended to be connected with closed expansion vessel. The volume of the
expansion vessel is calculated according to the quantity of the water in the installation and the static
height. When choosing the expansion vessel, it should never be chosen marginal size, but a size
greater.
The expansion vessel should be connected at the return line of the boiler (when pump is in front).
Before the installation, the pressure inside the expansion vessel should be regulated according to its
geometrical height from the point of its position up to the highest point of the installation. If this height
is lower than8 m, then the pressure is adjusted at 0,8 bar. If the boiler room is on a rooftop, the
pressure on the tank should be adjusted at 0,5 bar.
The automatic filling valve must be installed next to the expansion tank and it is adjusted so that, when
the installation is cool, there is a pressure equal to the geometrical height mentioned above plus 2 m. In
areas where high-pressure distributing networks are present, a pressure reducing gear must be placed.
11

5. Safetyfeatures
Install a safety kit, which shall be connected to the corresponding safety connection pipe. The
kit consists (minimum pc) of a safety valve, an air relief valve and a thermomanometer.
Additional safety equipment can be mounted on the outlet line, at a distance less than 1,5 m
from the boiler.
Type
Safety kit*
EN 15-50
½”
EN 60-80
¾”
EN 100-120
1”
EN 140-160
1¼”
*Safety kit is not included. Contact the
manufacturer for further information.
Fig 6. Boiler safety kit
6.Returntemperatureprotection
For the correct function of the boiler and for protection against condensation and corrosion it is
very important to ensure steady temperature at the return of the boiler of at least 55oC.
This can be ensured by installing a recirculation pump between the boiler outlet and return
(see connection diagrams). An alternative variation is by installing at the return of the boiler a
three-way thermostaticvalve.
7.Fillingthesystem
After completing all the hydraulic connections, the circuit may be filled with water. After filling
the system, open the radiators air valves to get rid of the air in the installation.
Verify that the installation pressure is according to the technical feature of the boiler. The
pressure must be verified through the boiler’s manometer. An additional manometer should be
installed on the cold water inlet to verify the cold pressure, at the lowest point of the
installation, at a point close to the boiler.
The whole installation must remain under nominal pressure for at least 10 minutes. During this
period, check that all the connections are tight and there are no water leakages. Make sure
that during this period no pressure dropappears.
After firing the boiler, make sure the network functions properly at working temperature and
pressure.
The hardness of the mains water supply affects the boiler’s life span. It is
recommended to use a water softener if water hardness exceeds 15of.
Do not fill the system at the working pressure! When the boiler will be heated,
the water pressure will raise. Filling pressure must be at least 1 bar lower
than working pressure!
12

8.Central heating installation overview (recommended)
Legend
1.
Boiler
15.
Water filter
2.
Burner
16.
Radiators
3.
Burner filter
17.
Radiators valves
4.
Pump
18.
Expansion vessel
5.
Fuel tank
19.
Automatic water filler
6.
Water-level indicator
20.
Burner thermostat
7.
Tank ventilator
21.
Pump thermostat
8.
Tank alimentation
22.
4-way mixing valve
9.
Tank plug
23.
Control panel
10.
Fuel valve for the burner
24.
External temperature sensor
11.
Electromagnetic oil valve
25.
Chimney
12.
Water return
26.
Chimney cleaning door
13.
Outlet water collector
27.
Drainage
14.
Return water collector
13

9.Generalinstructions
All electrical connection must be performed by an authorized professional, in conformity with
the local regulations and the indications of this manual. Connections must be done according
to norms EN 60529 and EN 60335-1, and protection norms IP 40 and IP44.
All wiring must be waterproof insulated. Exposed cables should be protected within plastic
channel. The main electrical supply of the boiler must be connected to an independent safety
of max 16A. The boiler room lighting must be on a separatecircuit.
The user is obliged to connect the boiler to an efficient grounding system.
MYTHERM declines any liability for damage caused to people, animals and
goods, due to defects caused by faulty electrical
connections or lack of connecting the boiler to an efficient grounding system.
14

10.SERVICE ANDMAINTENANCE
10.1 Cleaning theboiler
The boiler should be maintained and cleaned once a year. To clean the boiler follow the next
steps:
 Switch off the main switch in the boilerpanel.
 Disconnect the burner (ifnecessary).
 Open the boilerdoor.
 Remove the turbolators from the firetubes.
 Clean the fire chamber and the fire tubes by using a properbrush.
 Clean theturbolators.
 Assemble the pieces again and close thedoor.
 Connect the burner again (if you had disconnectedit).
The boiler function must be stopped before cleaning! Make sure all the devices
arestopped,andtheboilerhascooleddown.Itisstrictlyprohibitedtoclean
the boiler while in function!
10.2 Cleaning the chimneybox
To ensure efficient and safe function of the boiler, you must clean the chimney box once a
year.
The ash box is equipped with a cleaning door for this purpose. In order to open the door,
unscrew the wing nuts, remove the washers and springs that keep it in place.
Clean the interior of the chimney box and remove all the ash and residues. Put back the door
the same way as removed.
The springs must not be omitted! They act as safety in order of explosion of
exhaust gases in the chimney box.
15

17
10.3 After longstop
It is necessary to perform a general maintenance and cleaning of the boiler after the heating
season. Check the doors and the sealing cord. Make sure the contact with the boiler is air-
tight. Check that the door is correctly regulated and closes tight.
Remove the turbolators from the heat exchanger and check their condition.
It is recommended that you clean the chimney box of the boiler and the chimney pipes at least
once a year, in order to assure efficient and safe function of the boiler. The cleaning interval
depends on the type of fuel used (oil/gas, etc.)
Clean thoroughly all the surfaces of the boiler as described in the corresponding paragraph.
Also clean the chimney box, and all the chimney parts where ash might be deposited.
After long stop of the boiler, before you put in function you need to perform the following
checks:
 Check the condition of the electric cables and the sensors. Make sure they are not
damaged. Check that the thermometer indicates the correct temperature and all the
thermostats function properly. Make sure the bulbs are properly positioned in thecase.
 Make a general check of the chimney and make sure it is clean and free ofobstacles.
 Verify the pressure in the heating network and theboiler.
Do not empty the water of the boiler and the heating installation after the
heating season! It will corrupt all the installation and especially the boiler.
 Check that all the valves are working properly. Replace them if necessary. Pay special
attention so that all the safety equipment of the boiler functionsproperly!
 Make sure all the ball valves of the boiler and other relative equipment areopen.
 Check the function of the pumps. They might be blocked after longstop.
 Check that there have been no modifications to the installation and the boiler room
(ventilation openings, chimney anddoors).
 Check the burner function and clean fromdust.
10.4 Basic service procedures
Service after overheating
If overheating occurs, the safety valves of the boiler must open. Make sure the boiler pump is
working. In case of blackout, the burner will stop operation and the temperature will soon fall.
Open some valves of the system if necessary to decrease the boiler temperature faster.
All safety devices must lead to drainage! After overheating, make sure that all the water from
the safety devices has drained, and the system has filled with cold water. Check the pressure
and the temperature of the boiler.
At overheating, the safety thermostat will activate, and cut electrical supply to the burner. In
that case, you need to manually reset the safety thermostat and put the system back in
function. Unscrew the plastic cover of the safety thermostat and press the switch. Put the
plastic cover back.
Verify the causes of the overheating! If it happens again, check the installation
and function of the pumps and safety devices!
16