MHS Boilers EURON 24 Operating instructions

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Installation and Operation
Guide
EURON 24/30HG
EURON 30 HSG
Manual Ref: L307

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Contents ......................................................................... 2
General Information ......................................................................... 3
Regulations ......................................................................... 3
Conditions of warranty ......................................................................... 3
Quality of heating circuit water ......................................................................... 4
 5
Technical Data.................................................. 6 -7
Dimensions....................................................... 8
Minimum clearances ........................................ 9
Connection Kits................................................ 10
Access to Boiler / Case removal....................... 11
Connections..................................................... 12
 13
Ciculation Pump............................................... 14
Electrical Connections.................................... 15 -16
Connection of air/flue gas pipes....................... 17
Air/flue gas routing ........................................... 18
Flue variants and dimensioning ....................... 19
Commissioning Preparation for operation / Control Panel ......... 21-22
Parameter adjustment to control unit QAA73 . . 23
Flue gas Measurement and Adjustment........... 24 -27
Safety check of heating appliance.................... 28
Parameters....................................................... 29
Gas Changeover............................................... 30-32
Service and Maintenance Monitoring and checks...................................... 33 -34
Error Indication................................................. 35-36
Service Access to Boiler / Cover Removal....... 37
Dismantling burner and heat exchanger........... 38
Service Requirments........................................ 46
Appendix QAA 73 End User Parameters ...................... 40
QAA 73 Engineer Parameters ........................ 41
LMU 54 Engineer Parameters ........................ 42
LMU 54 Specialist Engineer Parameters ....... 43 - 44
Flue Termination Guidlines ............................... 45
Typical Hydraulic Schemes ............................... 46
Notes ......................................................................... 47
Contents

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General Information, Regulations
Conditions of warranty
General Information
Installation, assembly, gas
connection, electrical connection and
first commissioning must be carried
out by, and is the responsibility of, a
competent specialist(s).
Operator/End user Information
To ensure the continuing safety,
reliability and efficient functioning of
the boiler, the equipment must be
regularly serviced by a competent
specialist.
To ensure regular and essential
Servicing and Maintenance we would
recommend entering into a Service
Contract (Please contact MHS Boilers
Service Department for more details)
Clarification of Warranty
conditions
Faults arising from the following are
excluded from our warranty:
- Inappropriate or incorrect use
- incorrect installation i.e. not as per
MHS installation requirements
- Commissioning not carried out by
MHS Parts Only Warranty
- use of non-genuine spare parts
- Poor system water quality and
failure to maintain water treatment
- Use of inappropriate fuel
- Operation of boiler with excessive
or insufficient water pressure
- Operation of boiler using incorrect
power ratings
- Unauthorised modification or
alteration
- Failure to observe the information
in the manual and the instruction
plate on the burner equipment
Instructions, data badge and warning
labels on the boiler must never be
removed or altered. If damaged or
missing should be replaced as soon as
possible.
This appliance manual must be
handed to, and left with, the end
user following successful
completion of the installation.
This appliance should never be left
to operate with the outer casing
removed
Regulations and Standards
For safe, environmentally sustainable
and energy saving operation, observe
the following standards:
BS 5440-1:2008 Flueing and
ventilation for gas appliances of
rated input not exceeding 70 kW
net. Specification for installation of gas
appliances to chimneys and for
maintenance of chimneys
BS 5440-2:2000 Flueing and
ventilation for gas appliances of
rated input not exceeding 70 kW
net. Specification for installation and
maintenance of ventilation for gas
appliances.
BS 5449: Part 1 1977 Code of practice
for central heating for domestic
premises
BS 6798:2000 Specification for
installation of gas fired boilers of rated
input not exceeding 70 kW net.
BS 7671. Requirements for electrical
installations. IEE wiring regulations.
BS EN 12828: 2003 Heating systems
in buildings. Design for water-based
heating systems
Water Regulations (Water Fittings)
Regulations 1999.
Gas Safety (Installation & Use)
Regulations 1998.

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Heating circuit water quality
Heating circuit water quality
The composition and quality of the
system water have a direct influence on
the performance of the whole system
and the life of the boiler. On first filling,
and any subsequent refilling, a pH
balance of 7-8 should be maintained.
Please see the table below
The system must be flushed, cleansed
and treated with a good quality
corrosion inhibitor suitable for all the
materials in the system before the
boiler is put into use.
Failure to do this may affect the
boilers warranty.
No Chemical anti-corrosion medium
should be introduced to the system
Recommended Water treatment
Specialists:
Fernox
Forsyth Road
Sheerwater
Woking
Surrey
GU21 5RZ
www.fernox.com
Office Tel: [phone]
Technical Support: 0870 870 0362
Criterion
Appropriate Value
Effect of Deviation
PH - balance
7 - 8
Danger of corrosion for boiler and system
components.
Hardness
14dH
- Raised calcium deposits
- Low life expectancy of boiler
Chloride content
150 mg/l
Corrosion of alloyed materials

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Product Description
Overview
EURON HG
Legend
1 Air intake openings
2 Concentric air intake/flue gas connection
3 Manual air vent
4 Fluegas discharge / Flue hood
5 Burner Door / Burner
6 Stainless steel heat exchanger
7 Condensate drain hose
8 NTC Return sensor
9 NTC Flow Sensor
10 Condensate discharge Siphon
11 Low water pressure switch
12 Supply air hose
13 Heating system pressure gauge
14 Pump
15 Gas valve
16 Premix air/gas burner supply tube
17 Modulating burner fan
18 Ionisation electrode
19 Ignition electrode
20 Ignition transformer
21 STB flue gas 85 °C
22 Air/flue gas sampling points
EURON 30 HSG Combi
Legend
1 Air intake openings
2 Concentric air intake/flue gas connection
3 Manual air vent
4 Flue gas discharge connection
5 Burner
6 Stainless steel heat exchanger
7 Condensation drain hose
8 NTC Flow sensor
9 NTC Return sensor
10 3 way diverter valve
11 Condensate discharge Siphon
12 NTC domestic water sensor
13 Low water pressure switch
14 Supply air hose
15 Domestic hot water plate heat exchanger
16 Cold water inlet with filter
17 Hot water flow regulator
18 Heating system manometer
19 Pump
20 Gas valve
21 Premix air/gas burner supply tube
22 Modulating burner fan
23 Ionisation electrode
24 Ignition electrode
25 Ignition transformer
26 STB flue gas 85 °C
27 Air/flue gas sampling point
Euron 30 HSG

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Product Description
Technical Data –System Boiler
Units
HG 24
HG 30
Nominal Heat Output at 80° / 60° C
kW
5,8-22,8
6,9-28,1
Nominal Heat Output at 50° / 30° C
kW
6,1-23,6
7,2-29,2
Nominal Heat Input
kW
6,0-23,0
7,1-28,5
Normal supply level 75° / 60°C
%
107,2
107,1
Normal supply level 40° / 30°C
%
108,6
108,5
Standby loss TK = 70°C
%
0,1
0,1
Max. output pressure of Fan
Pa
110
90
Water content
L
1,8
2.5
Max. water pressure
bar
3.0
3.0
Max. flow temperature
°C
82
82
Condensate quantity at 40° / 30°C (22 kW)
ca. l/h
1,58
2,95
Gas Flow rate: Natural Gas G20
m3/h
2,43
3,01
Liquid Propane Gas LPG / G31
kg/h
1,81
2,25
Gas flow pressure: Nominal
mbar
20 Natural Gas
50 LPG
Gas flow pressure: min / max.
mbar
18 / 25 Natural Gas
50 LPG
Flue gas mass flow rate with Natural gas
g/s
10,19
12,47
Max Flue gas temperature
°C
74
71
Gas category
112H3B/P; 112E3P
Flue Classification
(B23 C13x C33x C43x C53x C63x C83x)
Electrical protection rating
IPX4D
NOx
Class 5
Ionisation min
uA
1
1
Connections: Air/flue gas hose
DN
80/125
80/125
Heating Flow / Return
mm
22
22
Gas connection
DN
3/4"
3/4"
Condensate hose connection
mm
28
28
pH balance - condensate
pH
3,2
3,2
Electrical Power consumption 230 V / VAC
W
129
129
CE - Identification number
0085BP0033
Width x height x depth
mm
450 x 750 x 378
Weight ca.
kg
35
37
Noise level Min./Max. load
dB (A)
36 -44
Product variables in calculating installation costs
according to DIN V4701-10:
Rated heat capacity

22,8
28,1
Efficiency at rated heat capacity

98,4
97,8
Part load efficiency
h3o% (%)
107,8
107,4
Return temp, on measurement of 30% part load efficiency
T30% (C)
30
30
Standby heat loss
q B.70 (%)
2,6
2,2
Electrical Consumption Max
W
129
129

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Product Description
Technical Data –Combi Boiler
Units
HSG 30 Combi
Nominal Heat Output at 80° / 60° C
kW
6,9-28,1
Nominal Heat Output at 50° / 30° C
kW
7,2-29,2
Nominal Heat Input
kW
7,1-28,5
Normal supply level 75° / 60°C
%
107,1
Normal supply level 40° / 30°C
%
108,5
Standby loss TK = 70°C
%
0,1
Max. output pressure of Fan
Pa
90
Service water temperature max./min.
°C
60/35
Hot water quantity AT=40°C
l/min./60°C
10,0
Minimum HWS Flow rate
l/min./60°C
2,5
Service water pressure max./min.
bar
6/0,8
Water content
I
2,5
max. water pressure
bar
3.0
max. flow temperature
°C
82
Condensate quantity at 40° / 30°C (22 kW)
ca. l/h
2,95
Gas Flow Rate: Natural Gas G20
m3/h
3,01
Liquid Propane Gas LPG / G31
Kg/h
2,25
Gas flow pressure norm
mbar
20 Natural Gas
50 LPG
Gas flow pressure min./max.
mbar
18 / 25 Natural Gas
50 LPG
Flue gas mass flow rate with Natural gas
g/s
12,47
Max Flue gas temperature
°C
71
Gas category
112H3B/P; 112E3P
Flue Classification
(B23 C13x C33x C43x C53x C63x C83x)
Electrical protection rating
IPX4D
NOx
Class 5
Ionisation flow min.
uA
1
Connections: Air/flue gas hose
DN
80/125
Heating Flow / Return
mm
22
Gas connection
DN
3/4"
Condensate hose connection
mm
28
pH balance - Condensate
pH
3,2
Electrical Power consumption 230 V / VAC
W
129
CE - identification number
0085BP0033
Width x Height x Depth
mm
450 x 750 x 378
Weight ca.
kg
37
Noise level Min./Max. load
dB (A)
36 44
Product variables in calculating Installation
costs according to DIN V4701-10:
Rated heat capacity

28,1
Efficiency at rated heat capacity
hioo% (%)
97,8
Part load efficiency
h3o% (%)
107,4
Return temp.on measurement of 30% part load efficiency
T 30% (C)
30
Standby heat loss
q B.70 (%)
2,2
Electrical Consumption max
W
129

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Product description
Dimensions
EURON24HG EURON 30 HG
Legend
A Flow 3/4"
C Gas inlet 3/4"
E Return 3/4"
G Condensation discharge 28 mm
H Siphon
(*) Water connection
(**) Gas connection
EURON 24 HSG Combi
EURON 30 HSG Combi
Legend
A Flow 3/4"
B Hot water outlet 1/2"
C Gas inlet 3/4"
D Cold water inlet1/2"
E Return 3/4"
G Condensation discharge 28 mm
H Siphon
(*) Water connection
(**) Gas connection

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Installation
Minimum clearances
Minimum clearances
For servicing of Boiler the
minimum clearances specified in the
diagram must be observed.
Wall mounting
Fix to the wall using the mounting
bracket and fixings supplied.

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Installation
Connection Kits
Connection Kit.
Each boiler comes with a connection
kit for gas, flow and return connections
on the system boiler and gas, flow,
return and Hot water service
connections for the Combi boiler.
These kits are there to aid installation
and remove the need for the installer
to provide isolation valves for the boiler
System Boiler Connection Kit
Combi Boiler Connection Kit
Important Note:
The Gas Isolation Valve, that is included as part of the connection bracket assembly (for Boiler
versions),  device.
The slam shut action of the valve is activated at 100ºC +/- 5K.
Installers should therefore avoid the use of soldered fittings in the gas line which are in close
proximity to the gas isolation valve.
If a fault occurs that indicates that no gas is able to pass through an isolation valve, then it should be
suspected that the thermal shut-off feature has been triggered. There is no possibility to reset a
triggered valve and it must be replaced.

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Installation
Access for Installation /Commissioning/ Servicing/Maintenence
Access to the Boiler is as follows:
Ensure boiler is switched off at the mains and Isolated from gas supply
Then to gain access to inside the boiler, complete the following steps:
Remove the 4 screws (1) from the
underside of the housing (2 either
side)
Open the Release clips on top of the
boiler Casing
Pull the Boiler casing towards you.
You will now have acces to the
internal components of the boiler
Hinge forward the Control panel (4) for access to the rear of the controller
and wiring. Removing the 5 screws (5) will enable the rear cover (6) to be
removed for access to wiring.
1
1
2
3
240v Connections
Low Voltage
Connections

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Installation
Connections
Gas connection
The Boiler is designed to belong to
the following categories for the use of
gas types.
Country
Categories
GB
II2H3P
II2H3B/P
Please check the Boiler name plate and
packaging to ensure that it is correct for
UK Operation and that the gas category
corresponds to one of the appropriate for
the UK.
The gas inlet must be manufactured and
measured according to the relevant
specific country regulations as well as the
maximum output of the equipment; check
also the correct calculation and
connection of the stop valve.
Before installation, the gas line should be
thoroughly cleaned, so that any residue
does not impair the functional efficiency
of the heating appliance.
Also ensure that the boiler is for the
correct type of gas to be used i.e. Natural
Gas or LPG (check the name plate in the
interior of the appliance).
Check the required gas pressure for
either natural gas or LPG.
Water connection
All connections for water and gas are
as per the illustration on page 8.
Ensure that the cold water main
pressure does not exceed 6 bar. If > 6
bar then a pressure limiter device must
be fitted.
The minimum pressure needed by the
appropriate devices for processing of
hot service water is about 0.2 bar.
On sizing the pipes and the heating
element of the Boiler, the residual
head pressure must be considered
depending on the required flow rate as
per the pump circulation curve (see
page 14)
With Combi Boiler (type HSG) flow
limiters are built into the water switch.
This ensures a constant flow of service
water
(EURON 24 HSG = 8 Litre/Minute
EURON 30 HSG = 10 Litre/Minute).
Underfloor heating
For underfloor heating, attach a
suitable safety thermostat to the
supply. (see page 15)
Note: High flow temperature leads to
an operating lockout of the Boiler both
in DHW and heating operation:
The error code "110" appears on the
display. Operation is resumed by
pressing RESET (6) key (see page 22),
after the flow temperature has
dropped.

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Installation
Hydraulic diagrams
EURON HG/HSG
Legend
1 Manual bleed valve
2 Stainless steel heat exchanger
3 Burner
4 Mixing channel air/gas
5 Modulating Fan
6 Venturi
7Gas valve
8 NTC-Appliance supply sensor
9 Motor of 3-way valve (Combi)
10 3-way valve (Combi)
11 Minimum pressure switch
12 NTC-Service water sensor (Combi)
13 Service water plate heat
exchanger (Combi)
14 Service water flow control (Combi)
15 Cold water filter (Combi)
16 Automatic heating bypass
17 3 bar safety valve
18 Pressure Gauge
19 Circulation pump
20 Automatic bleed valve
21 Condensate syphon
22 NTC-appliance return sensor
23 Flue Gas Collection Hood
24 Expansion tank (optional)
25 Flue Gas STB
A Flow 3/4"
B Hot water outlet 1/2" (Combi)
C Gas intake 3/4"
D Cold water intake1/2" (Combi)
E Return 3/4"
EURON HG
EURON HSG

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Installation
Circulation pump
Residual head pressure of the circulation pump at pump speed 2 + 3
24 HG
30 HSG/HG
Flowrate
V3
(mbar)
V2
(mbar)
V3
(mbar)
V2
(mbar)
1300
1200
127,5
1100
162,5
119
1000
221
190
900
280
83
252
800
325
142,5
308
102
700
373,5
207
361
165
600
419,5
269
409
231
500
459,5
320
463
287
400
491,5
365
503
343
300
522
408,5
548
394
200
547
440
561
440
100
568
470
588
467
0
584
494
601
491
Legend
V2 2. Pump stages
V3 3. Pump stages
Graphic representation of the residual head pressure of the circulation pump at pump speed 2 + 3 (please note that this graph
includes models not covered by this manual)
Stage 3
Stage 2

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Installation
Electrical connections
General Information
Electrical installation and connection
must be carried out by an authorised
installer in accordance with applicable
National Standards, Local Standards
and Regulations.
Mains connection and Customer
wiring
The appliance is designed for
permanent connection using cables
NYM 3x1.5 mm2 or H05W-F 3 x 1
mm2. The connection cable should not
be larger than 8 mm in diameter.
Connect the mains wiring to the
respective terminals, on the Boiler
Terminal strip, in the 240V section at
the rear of the control panel. (See
picture below)
A suitable mains isolator switch must
be fitted in the power supply, to the
boiler, and sited in the boiler room.
This can be used to switch off power
to the boiler for maintenance purposes
or in the event of a problem.
Mains voltage: 230 V, 50 Hz
Mains cable Connection
All external connection cables should
be stripped to a max. 30 mm. All
external Cables entering the Boiler
must be firmly clamped in the Cable
grip after connection
The length of the cables must be
designed accordingly. Additional
cables (e.g. for system integrations),
which are attached to the terminal strip
in the boiler, must be secured along
with mains lead via the Cable grip.
When connecting the boiler, ensure
the earth cable (yellow/green), which
is longer than the supply wires (see
illustration) is connected.
Multiple plug sockets, extension cable
and adapter are not appropriate. For
earthing of the appliance under no
circumstances use the piping of the
water supply installation, heating or
gas installation.
Please note the appliance is not
protected against damage from
lightning strikes.
If the mains fuses are to be changed,
use 2A Quick Blow fuses.
Note before any connections are
made below the boiler must be
switched Off.
Remote Operation (Volt Free)
A volt free enable to the Boiler for a
Thermostat, Time switch etc, is
possible via X10-02 (2)
Remote Operation (QAA73)
Connection (1) for a QAA73 must
be via a cable with at least. 2 x 0,5
mm2.
The "Bus" cable of the QAA73
(20-30 V) must be installed and
run separately from the 230 V/50
Hz cables. The QAA73 connects
to the X10-01 connector using
screened cable.
Note: If the QAA 73 remote
control is being used, the
thermostat bridge must be
disconnected from the X10-02 (2)
connection.
Note: Only one type of Boiler
enable can be used via either
X10-01 or X10-02
Ambient / External Sensor
(QAC34)
Connect the Outside Air
Temperature sensor (3), if
required, using a Screened Cable
with at least 2 x 0,5 mm2, with a
maximum length of 50m.
The sensor should be positioned
on a North Facing Wall at a height
of 2 2.5 m above the floor. Under
no circumstances must it be
directly exposed to sunlight.
Connect the ambient/external
sensor to the X10-06 (3)
connector (using screened cable).
Safety Thermostat for
Underfloor Heating
Remove the bridge loop from the
terminals on the right hand side of
the Terminal Block, on the 240v
connection side, and connect the
safety thermostat for the
underfloor heating.
The Connections on the boiler
wiring side will be pre-wired back
to X3-01 on the LMU unit.
Earth Block
240v Mains Power Connection
240V Connection.
1st TwoTerminals
Connection for
Underfloor limit
thermostat
Cable Grip

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Installation
Electrical connections
Controls Options / Accessories
OCI420 Clip in Module - For Multiple Boiler communication.
AGU2.514 Clip in Module For system incorporating pumped Heating circuit & Pumped HWS Primary (see P46 scheme 1)
AGU2.511 Clip in Module BMS Run / Fault Indication & 0 -10v input Clip
RVA47 Cascade Control - Cascade Controller for multiple boiler applications
RVA46 Zone Control
RVA63 Multi Zone Control

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Installation
General
Connection of air/flue gas pipes
Flue gas and supply air connection
The EURON is suitable for use as
conventional or balanced Flue. The
flue that is connected must be
removable.
As with all flue systems, it must be
ensured that there is no short circuit /
cross-contamination between the
supply air and flue gas.
For flue gas safety the EURON is
fitted with an flue gas temperature
safety limiter (set at 85°C), therefore
this does not need to be provided for
in the installation.
The combustion air supply must be
ensured. In areas such as in a laundry
or workshop, a hair salon, in areas with
electroplating,printing or metalworking.
In such or similar cases the supply air
must be supplied from a outside the
building.
Condensate connection
For every m3of natural gas burnt, 0.7
to 1.0 litres of condensate is produced,
as a consequence of the very high
utilisation of energy. This of course
must be discharged from the boiler.
Due to its acidic nature, plastic piping
must be used for draining the
condense. The condensate must be
able to run off freely into a tundish (or
neutralization tank), therefore avoiding
a back-up of condensate into the
boiler. Please Refer to BS6798:2000
for guidance.
(See picture to right)
Condensate created in the flue must
also be allowed to drain away freely
with the same considerations as for
the boiler condesate. Local regulations
must be observed. Prior to
commissioning the siphon in the
EURON must be filled with water .
Connection to air/flue gas routing
For concentric air/flue gas routing only
original MHS accessory parts should
be used.
Condense
Connection

18 of 49
Installation
Air-flue gas Installation
For the installation of concentric
air/flue gas systems the use of
original accessory parts by MHS is
recommended.
Connection kits for fluing of the air/
flue gas are supplied separately from
the appliance depending on the
various installation options.
This boiler comes ready for
connection to a concentric air/flue gas
system.
The flue connection to the boiler can
be either using 80/125mm concentric
flue or via double pipe 80/80mm flue.

19 of 49
Installation
Air/flue gas Installation
Combustion Air from the Boiler Room, Ø 80mm PPS
B23
Open Flue Appliance –Air Supply fgrom the room –Flue Gas discharge via
roof.
Room Sealed Appliance, Ø 80/125mm PPS / Alu
C13
Room sealed appliance –Connected to Concentric supply / flue discharge
through a wall
C33
Roome Sealed appliance –connected to concentric air supply / flue
discharge through the roof
C43
Room Sealed appliances, connected in cascade, connected to a common U
shaped concentric supply / flue discharge at the appliance
C53
Room sealed appliance, connected to a separate air supply and flue
discharge pipe, opening into different pressure areas.
C63
Room sealed appliance, sold without related connecting and/or discharge
fittings.
C83
Room sealed appliances in cascade, connected to separate air supplies
but common flue discharge through the roof.
Note: For Flue Gas Termination Guidance please refer to the diagram on page 44

20 of 49
Condense Connection
Commissioning
Preparation for operation
General
To ensure the safe and correct operation
of the boiler, commissioning must be
carried out by a suitably qualified
specialist.
Monitoring
Ensure condensate connection is
connected using the condense drain
hose supplied or using plastic piping.
Ensure that the Condense outlet is
piped to a suitable drain. Please refer to
BS6798 for ultimate guidance
First commissioning
Fill hydraulic circuits
Proceed as follows:
Open the boiler bleed valve and the
valve above the stainless steel heat
exchanger.
Loosen the closure of the automatic
bleed valve on the circulation pump.
Slowly open the system filling point
and shut the bleed valve on the
stainless steel heat exchanger, and
the boiler, as soon as water is
evident. Shut the filler valve, once
the pressure shown on the water
pressure gauge reaches 1.0 bar.
Ensure that:
The the automatic bleed valve on
the circulation pump is opened.
The boiler pressure, on the
manometer is 1 bar. The gas valve
is completely shut off. The electrical
connection has been correctly
made.
Ensure in every case, that the
green/yellow earth wire is connected to
a suitable earth.
To bleed the appliance, proceed as
follows:
Switch on boiler (10). This sets the
pump of the heating appliance in
operation and there are three
consecutive attempts to ignite the
burner. After the third attempt the
electronics lock the appliance, as
the gas supply is cut; the display
shows the readout "133".
Allow the pump to work until all the
air has left the appliance. Vent the
boiler. Check the appliance
pressure and refill with water in the
case of a drop in pressure, until
pressure again reaches 1 bar.
Check the flue gas system.
Ensure that any necessary room
ventilation openings are open.
Ensure the boiler condensation
siphon is filled with water.
(See illustration below centre).
If the appliance is unused for a long
period, the siphon must be filled
before switching on again. It is
dangerous not to refill the siphon with
water, as this can cause the flue gas
to escape from the condense drain.
Open the gas tap and check the
tightness of all connections. Unlock
the boiler by pressing the Reset key
"6". The burner will ignite. Should this
not happen, repeat the above
procedure, until the burner ignites.
Gas supply
Proceed as follows:
Ensure that the type of gas used
corresponds to the type of gas
indicated on the nameplate of the
boiler.
Power supply
Ensure that the voltage and frequency
of the power supply conform to the
data on the name plate of the boiler.
Ensure that the live and neutral
connections have been made and to
the correct terminals. Check that the
earth is connected.