WarmFlow GS25A User manual

TR05A140.B1107

Boiler Manual

Incorporating: User Instructions

Installation Instructions

Commissioning Instructions

Maintenance Instructions

Commissioning Certificate

Service Record

High Efficiency

Condensing Gas Boilers

Model covered by this manual:

G-Series GS25A

Gas premix system boiler

SEDBUK

TR05A140.B1107

CONTENTS

TR05A140.B1107

1 USER INSTRUCTIONS 3

1.1 Boiler controls 3

1.1.1 Control panel layout 3

1.1.2 Operating the appliance 3

1.2 Topping up the system (Error Code H20) 4

1.3 If you smell gas 4

2 GENERAL INFORMATION 5

2.1 General warnings 5

2.2 Information 5

2.3 Product conformity 7

3 TECHNICAL CHARACTERISTICS 8

3.1 Technical data 8

3.2 Dimensions 9

3.3 Internal components 10

3.4 Function diagram 11

3.5 Circulation pump performance curves 12

3.6 Control panel and display 13

3.6.1 Layout 13

3.6.2 Boiler operation 13

3.6.3 Function codes 14

4 INSTALLATION 15

4.1 Reference standards 15

4.2 Unpacking 16

4.3 Installing the boiler 17

4.3.1 Compartment ventilation 17

4.4 Water connections 18

4.4.1 Central heating circuit 19

4.4.2 Filling the central heating system 19

4.5 Condensate drain 20

4.6 Gas connection 21

4.7 Electrical connections 22

4.7.1 General warnings 22

4.7.2 Power supply 23

4.8 Flue connections 24

4.8.1 Flue position 25

4.8.2 Horizontal coaxial balanced flue – Ø 60/100 (Kit K) 26

4.8.3 Horizontal coaxial balanced flue – Ø 80/125 27

4.8.4 Vertical coaxial balanced flue – Ø 60/100 (Kit V) 28

4.8.5 Vertical coaxial balanced flue – Ø 80/125 29

4.8.6 Twin pipe flue system – Ø 80/80 (Kit H) 30

5 COMMISSIONING 31

5.1 General warnings 31

5.2 Filling the system 32

5.3 Flushing the system 33

5.4 Filling the condensate trap 33

5.5 Starting the boiler 34

5.6 Control parameters 35

CONTENTS

TR05A140.B1107

5.7 Control parameter adjustment 36

5.7.1 Accessing the parameters menu 36

5.7.2 Adjusting the parameters 37

5.8 Gas data 42

5.8.1 Technical reference tables 42

6 MAINTENANCE 43

6.1 General warnings 43

6.2 Boiler inspection 43

6.3 Accessing the boiler 44

6.3.1 Front panel removal 44

6.3.2 Side panel removal 44

6.3.3 Control panel access 44

6.4 Draining the central heating system 45

6.5 Flushing the central heating system 45

6.6 Maintenance operations 46

6.6.1 Primary heat exchanger and burner unit 47

6.6.2 Ignition and ionisation electrodes 48

6.6.3 Safety thermostat 48

6.6.4 Heating sensor 48

6.6.5 Gas valve 49

6.6.6 Circulating pump motor body 49

6.6.7 Electric fan 50

6.6.8 Expansion vessel 50

6.6.9 Modulation circuit board 51

6.6.10 Electric fan circuit board 51

6.6.11 Primary heat exchanger replacement 51

6.7 Wiring diagram 52

6.8 Troubleshooting 53

6.8.1 Error codes 53

6.9 Parts lists 54

6.9.1 Main components 54

7 OPTIONAL CONTROLS 55

7.1 External controls, programmers and room thermostats 55

7.1.1 Appliance connections 55

7.1.2 S-Plan wiring schematic 56

GENERAL INFORMATION

TR05A140.B1107

3

1 USER INSTRUCTIONS

1.1 Boiler controls

1.1.1 Control panel layout

1. ON/OFF button

2. Central Heating Control knob

3. button

4.

S

button

5. button

6. Mains supply terminal board

7. Digital LCD display

8. Programmer location (N/A)

1.1.2 Operating the appliance

Operation Instruction

Switching the boiler on

Press the ON/OFF button (1)

Adjusting the Central Heating temperature

Turn the Central Heating Control knob (2):

- the temperature setting will appear on the display

Switching the boiler off

Press the ON/OFF button (1)

Table 1: Control panel display

Figure 1: Control Panel

1 2

ON / OFF

3 4 5 6

78

GENERAL INFORMATION

TR05A140.B1107

4

1.2 Topping up the system (Error Code H20)

If the water pressure in the central heating circuit falls below 0.3 bar, the boiler will go to lock out (stop

working) and Error Code H2O will appear on the display. This could be caused be a leak in the system,

if air is bled from a radiator or if a radiator is replaced. The system will then need to be topped up.

To top up the system:

• Let the boiler and radiators cool down;

• Connect the filling loop (usually located near the boiler);

• Open the filling loop valve (or valves);

• Fill the system until the pressure gauge (located on the underside of the boiler) reads 1 bar;

• Switch the boiler off then on again using the ON/OFF button on the Control Panel;

• Check that Error Code H2O is no longer shown on the Control Panel display;

• Close the filling loop valve (or valves) and disconnect the filling loop.

The boiler should now fire and continue to work normally.

If a lot of water was required to fill the system (such as after a radiator is replaced) it may be necessary

to repeat the process a few times over a period.

1.3 If you smell gas

• DO NOT operate any electric switches, telephones or any other equipment that may cause sparks;

• Open doors and windows immediately to create a current of air and ventilate the room;

• Shut off the main gas supply valve (either at the meter or on the cylinder in the case of bottled gas);

• From a safe location, telephone the following 24 hour gas emergency numbers:

Great Britain 0800 111 999

Northern Ireland 0800 002 001

Republic of Ireland 1850 20 50 50

GENERAL INFORMATION

TR05A140.B1107

5

2 GENERAL INFORMATION

2.1 General warnings

This appliance must only be installed and commissioned by professionally qualified personnel in

accordance with current laws and standards and in line with the manufacturer’s instructions.

In the United Kingdom, the installation must be carried out by a CORGI Registered Installer. To check for

authorised qualified engineers please contact CORGI on 0870 401 2300. The installation must be carried

out in accordance with the relevant requirements of:

- The Gas Safety Regulations;

- The appropriate Building Regulations – either the Building Regulations, the Building Regulations

(Scotland) or the Building Regulations (Northern Ireland);

- The Water Fittings Regulations or Water Byelaws in Scotland;

- The current I.E.E. Wiring Regulations.

Where no specific instructions are given, reference should be made to the relevant British Standards

Code of Practice.

In the Republic of Ireland, the installation must be carried out by a competent person and in accordance

with the current edition of I.E. 813 ‘Domestic Gas Installations’, the current Building Regulations and the

current ETCI rules for electrical installations.

The appliance must be used solely for the purpose for which it has been designed and manufactured:

central heating and domestic hot water production. Any other use is deemed as improper and as such

dangerous. Under no circumstances will the manufacturer be held responsible for damage or injury to

persons or animals caused by errors in the installation and/or use of the appliance, or through non-

compliance with current local and national standards and/or the manufacturer’s instructions.

This instruction manual forms an integral and essential part of the product and must be kept with the

appliance, in a safe place, available for future reference. This manual, along with the Benchmark

commissioning booklet, must be left with the end user as per Regulation 29 of the HSC Gas Safety

(Installation and Use) Regulations 1998.

The warnings contained in this chapter have been written for the appliance user, the installer and the

service engineer.

This instruction manual must be read carefully as it provides information on the operation and the

operating limits of the appliance.

This appliance is only suitable for use in a sealed central heating system.

2.2 Information

• After the removal of all the packaging, check that the appliance has not been damaged. In case of doubt, do not

attempt to use the product but refer to the supplier. Packing materials (cardboard box, wooden crate, nails, staples,

plastic bags, polystyrene, etc.) must not be left within reach of children as these items represent a potential hazard

and must be disposed of in a responsible manner.

• Before carrying out any cleaning or maintenance operations, isolate the appliance from the electricity supply by

switching off at the main switch and/or any other isolating device.

• Do not obstruct the air intake or flue exhaust terminals.

• In the case of a fault and/or malfunction in the appliance, shut down the system. Do not interfere with or attempt to

repair the appliance. Contact your commissioning engineer in the first instance or contact the Warmflow Customer

Care Centre on 028 9262 1515.

• Any warranty repairs to the appliance must be carried out exclusively by the manufacturer’s authorised service centre

using original spare parts. Non-compliance with this requirement may compromise the safety of the appliance and

invalidate the warranty. In order to guarantee the efficiency of the appliance and its correct operation, it must be

serviced regularly by professionally qualified personnel in line with the manufacturer’s instructions.

GENERAL INFORMATION

TR05A140.B1107

6

• When the appliance is no longer required for use, any parts that may constitute potential sources of danger must be

rendered harmless.

• Only original accessories or optional extras (including electrical parts) may be used with the appliance.

• Should there be a smell of gas present in the room where the appliance is installed, DO NOT attempt to activate any

electric switches, telephones or any other equipment that may cause sparks. Open doors and windows immediately to

create a current of air and ventilate the room. Shut-off the main gas supply valve (either at the meter or on the cylinder

in the case of bottled gas), then telephone the following 24 hour gas emergency numbers:

Great Britain 0800 111 999

Northern Ireland 0800 002 001

Republic of Ireland 1850 20 50 50

• Before starting the boiler for the first time, make sure that it is connected to a water supply and central heating system

compatible with its performance characteristics.

• Check the technical data displayed on the packing and on the data plate located on the inside of the front casing.

Also check that the burner is appropriate for the type of gas to be used.

• Make sure that the pipes and fittings used for the gas service are perfectly tight and that there are no gas

leaks.

• Prior to start-up, the central heating pipes should be flushed to remove any residues that could compromise the

operation of the appliance.

• The appliance can be regarded as being electrically safe when it has been connected to an effective earth system

installed in accordance with the requirements of current safety standards. This fundamental safety requirement must

be checked and verified. In case of doubt, have the electrical system checked by a qualified electrician. The

manufacturer will not be held liable for any damage or injury caused as a result of an ineffective or non-existent earth

system.

• The domestic power supply must be checked by a qualified electrician to ensure that it can support the maximum

power absorption of the appliance, as indicated on the appliance data plate (positioned on the inside of the front

casing). In particular, make sure that the cable ratings are adequate for the power absorbed.

• Do not use adapters; multiple sockets or extension leads to connect the appliance to the mains power supply.

• The appliance must be connected to the mains power supply through an appropriate electrical isolator in accordance

with the current wiring regulations.

• When using an electrical appliance, a few fundamental rules must be observed:

Do not touch the appliance with damp or wet parts of the body or when barefoot;

Do not pull on the electric wires;

Do not leave the appliance exposed to atmospheric elements (rain, sun, etc,) unless these conditions have been

expressly provided for;

Do not allow the appliance to be used by children or anyone unfamiliar with its operation.

• The user must not replace the power supply cable.

• If the cable is damaged in any way, switch off the appliance and have the cable replaced by a suitably qualified

electrician.

• When the appliance is no longer required for use, switch off the main power supply to deactivate all the

electrical components (circulating pump, burner, etc.)

GENERAL INFORMATION

TR05A140.B1107

7

2.3 Product conformity

Warmflow declares that all its products are manufactured to a high specification and in compliance with the relevant

standards.

All Warmflow gas boilers are CE certified and possess technical and functional characteristics that comply with the

following directives and standards:

GAS APPLIANCES DIRECTIVE 90/396 CEE for CE compliance

LOW VOLTAGE DIRECTIVE 73/23 CEE

ELECTROMAGNETIC COMPATIBILITY DIRECTIVE 89/336 CEE

BOILER EFFICIENCY DIRECTIVE 92/42 CEE

UNI EN 297 for GAS-FIRED CENTRAL HEATING BOILERS TYPE B OF NOMINAL HEAT INPUT ≤ 70 kW

EN 483 for GAS-FIRED CENTRAL HEATING BOILERS TYPE C OF NOMINAL HEAT INPUT ≤ 70 kW

UNI EN 677 for GAS-FIRED CENTRAL HEATING BOILERS: SPECIFIC REQUIREMENTS FOR CONDENSING

BOILERS WITH NOMINAL HEAT INPUT ≤ 70 kW

Warmflow will not be responsible for the consequences of non-observance of the instructions contained

within this manual where actions not specifically described herein are undertaken.

TECHNICAL CHARACTERISTCS

TR05A140.B1107

8

3 TECHNICAL CHARACTERISTICS

3.1 Technical data

Model

GS25A

Appliance Type C13, C33, C43, C53, C63, C83

Appliance Category II2H3+

Heat Input max

kW 25

Heat Input min

kW 9

Heat Output max (50/30°) kW 26.67

Efficiency 100% (full load 50/30°) % 106.7

Efficiency 30% (partial load 50/30°) % 106.3

Heat Output max - 80/60°C (Non condensing) kW 24.6

Heat Output min - 80/60°C (Non condensing) kW 8.73

Efficiency 100% (full load 80/60°) % 98.4

Efficiency 30% (partial load 80/60°) % 100.1

GAS DIRECTIVE 92/42/ECC - Efficiency marking stars 4

SEDBUK band A

Central Heating (CH) Circuit

CH water temperature setting (min-max) °C 30-80

Max. CH working temperature °C 80

Expansion vessel capacity litres 8

Max. CH working pressure bar 2.5

Min. CH working pressure bar 0.3

Dimensions

Width mm 410

Height mm 730

Depth mm 285

Weight (net) kg 46

Hydraulic Connections

CH Flow connection Ø 3/4" (22mm tail supplied)

CH Return connection Ø 3/4” (22mm tail supplied)

Gas connection Ø 3/4” (22mm tail supplied)

Flue Systems

Horizontal Concentric flue system Ø mm 60/100

Max. Flue length m 5

Horizontal Concentric flue system Ø mm 80/125

Max. Flue length m 7

Vertical Concentric flue system Ø mm 60/100

Max. Flue length m 5

Vertical Concentric flue system Ø mm 80/125

Max. Flue length m 7

Twin Pipe flue system Ø mm 80/80

Max. Flue length m 50

Gas Supply

Natural gas (Methane) G20

Inlet pressure mbar 20

Gas consumption m

3

/h 2.65

Butane G30

Inlet pressure mbar 30

Gas consumption kg/h 1.97

Propane G31

Inlet pressure mbar 37

Gas consumption kg/h 1.94

Electrical Specifications

Power supply V/Hz 230/50

Electrical power consumption W 170

Electrical protection IP X4D

Table 2: Technical data

TECHNICAL CHARACTERISTCS

TR05A140.B1107

9

110137163

285

132

730

HF

G

HR

14849 182 31

285

730

111.5187111.5

48.5 313 48.5

105

ON / OFF

3.2 Dimensions

LEGEND

HR HEATING RETURN 22mm

HF HEATING FLOW 22mm

G

GAS 22mm

SC CONDENSATE DRAIN 25mm

Figure 2: Dimensions

TECHNICAL CHARACTERISTCS

TR05A140.B1107

10

3.3 Internal components

LEGEND

1. PRIMARY CONDENSING HEAT EXCHANGER

2. PREMIX BURNER UNIT (GAS MANIFOLD + BURNER)

3. HEAT EXCHANGER CONDENSATE DRAIN CONNECTION

4. IONISATION ELECTRODE

5. IGNITION ELECTRODE

6. FAN

7. VENTURI

8. IGNITION TRANSFORMER

9. ELECTRONIC GAS VALVE

10. 3 BAR PRESSURE RELIEF VALVE – HEATING CIRCUIT

11. AUTOMATIC AIR VENT VALVE

12. HEATING SAFETY THERMOSTAT

13. HEATING SENSOR

14. PUMP WITH AIR VENT

15. WATER PRESSURE SWITCH

16. FLUE HOOD

17. FLUE SAFETY THERMOFUSE

18. EXPANSION VESSEL

19. ROOM SEALED CHAMBER BULKHEAD

20. CONDENSATE TRAP

21. WATER PRESSURE GAUGE

22. SYSTEM DRAIN VALVE

23. CONDENSATE DRAIN PIPE

24. AUTOMATIC BYPASS

25. PRIMARY HEAT EXCHANGER MANUAL AIR VENT VALVE

Figure 3: Internal components

13

24

19

5

15

17

3

2

16

23

9

18

1

12

21

20

7

6

10

14

22

11

8

4

1

11

9

19

14

12

6

5

4

16

2

25

TECHNICAL CHARACTERISTCS

TR05A140.B1107

11

3.4 Function diagram

LEGEND

1. PRIMARY CONDENSING HEAT EXCHANGER

2. PREMIX BURNER UNIT (GAS MANIFOLD &

BURNER)

3. HEAT EXCHANGER CONDENSATE DRAIN PIPE

4. IONISATION ELECTRODE

5. IGNITION ELECTRODE

6. FAN

7. VENTURI

8. IGNITION TRANSFORMER

9. ELECTRONIC GAS VALVE

10. 3 BAR PRESSURE RELIEF VALVE - HEATING

CIRCUIT

11. AUTOMATIC AIR VENT VALVE

12. HEATING SAFETY THERMOSTAT

13. HEATING SENSOR

14. PUMP WITH AIR VENT

15. WATER PRESSURE SWITCH

16. FLUE HOOD

17. FLUE SAFETY THERMOFUSE

18. EXPANSION VESSEL

19. ROOM SEALED CHAMBER

20. CONDENSATE TRAP

21. WATER PRESSURE GAUGE

22. AUTOMATIC BYPASS

23. CONDENSATE DRAIN PIPE

24. SYSTEM DRAIN VALVE

Figure 4: Function diagram

5

16

2

3

17

18

19

23

G HFHR

SC

4

22

12

1

13

21

14

10

11

20

9

6

8

15

7

HR HEATING RETURN 22mm

HF HEATING FLOW 22mm

G

GAS 22mm

SC

CONDENSATE DRAIN 25mm

TECHNICAL CHARACTERISTCS

TR05A140.B1107

12

3.5 Circulation pump performance curves

Figure 5: Pump performance curves

I

II

I

II

III

14001200 1600

70

50

60

40

1000

800400 600

30

10

20

0

200

III

Appliance Loss

Available head at minimum speed

Available head at second speed

Available head at maximum speed

Flow l/h

Head (kPa)

TECHNICAL CHARACTERISTCS

TR05A140.B1107

13

3.6 Control panel and display

The appliance MUST be supplied with a permanent live in order for the boiler’s protective functions to

operate. These functions include frost protection, post-ventilation, pump overrun and pump & 3-way

valve inactivity protection. On first connection to the power supply, the appliance must be switched on

using the ON/OFF button on the control panel to activate all of the above protective features. The

appliance can then be switched off but the protective features will remain active.

3.6.1 Layout

1. ON/OFF button

2. CH Control knob

3. DISPLAY button

4.

S

SERVICE button

5. MODE button

6. Mains supply terminal board

7. Digital LCD display

8. Programmer location (N/A)

3.6.2 Boiler operation

Mode / Control Input Display will show:

Boiler switched off

OFF

Press ON/OFF button (to switch the boiler on)

Primary circuit temperature in ºC

Icon – lit when appliance switched on

CH controls call for heat

Primary circuit temperature in ºC

Icon – flashes whilst CH mode is active

CH Control knob turned

CH set point temperature in ºC – displayed for 3 seconds

SERVICE button pressed & held for 7 seconds

Function Code 07 – flashes whilst activated

(see Section 3.6.3)

Boiler protection function activated

(automatically)

Function Code 08 – flashes whilst activated

(see Section 3.6.3)

Boiler locked out

Error Code – flashes whilst locked out

(see Section 6.8.1)

Table 3: Control panel display

Figure 6: Control Panel

1 2

ON / OFF

3 4 5 6

78

TECHNICAL CHARACTERISTCS

TR05A140.B1107

14

3.6.3 Function codes

Code Function Description

07 Commissioning Mode

Operates the boiler at maximum CH output for 15 minutes

without modulation.

Activated by pressing and holding the

S

button for 7 seconds.

Deactivated by switching the appliance off.

08

CH Frost Protection Mode

Operates the boiler at minimum CH output in Heating Only

Mode.

Activated when the CH sensor detects below 5°C.

Deactivated when the CH sensor detects above 30°C.

Table 4: Function codes

INSTALLATION INSTRUCTIONS

TR05A140.B1107

15

4 INSTALLATION

4.1 Reference standards

In the United Kingdom, the installation of this appliance must be carried out by a CORGI Registered

Installer. To check for authorised qualified engineers contact CORGI on 0870 401 2300. The installation

must be carried out in accordance with the relevant requirements of the:

- Gas Safety Regulations;

- The appropriate Building Regulations – either the Building Regulation, the Building Regulations

(Scotland) or the Building Regulations (Northern Ireland);

- The Water Fittings Regulations or Water Byelaws in Scotland;

- The current I.E.E. Wiring Regulations.

Where no specific instructions are given, reference should be made to the relevant British Standards

Code of Practice.

In the United Kingdom, the following Codes of Practice apply:

BS 5440: Part 1 Flues

BS 5440: Part 2 Air Supply

BS 5546 Installation of hot water supplies for domestic purposes

BS 5449 Forced circulation hot water systems

BS 6700 Installation of cold water supplies for domestic purposes

BS 6798 Installation of gas-fired hot water boilers

BS 6891 Gas Installation

BS 7074 Expansion Vessels and ancillary equipment for sealed water systems

BS 7593 Treatment of water in domestic hot water central heating systems

BS 7671 IEE wiring regulations

In the Republic of Ireland, the installation must be carried out by a competent person and in accordance with the

current edition of I.E. 813 ‘Domestic Gas Installations’, the current Building Regulations and the current ETCI

rules for electrical installations.

Failure to install a gas appliance correctly and in accordance with the above standards could result in

prosecution.

INSTALLATION INSTRUCTIONS

TR05A140.B1107

16

4.2 Unpacking

■ The materials (cardboard) used for packing the appliance are fully recyclable.

■ It is recommended that the packing material is only removed when the appliance is ready to be installed.

The manufacturer will not be held responsible for damage caused by incorrect storage of the product.

■ Packing materials (plastic bags, polystyrene, nails, etc.) must not be left within reach of children, in that

these items represent a potential hazard.

A. With the packed appliance on

the floor (see Figure 7), remove

the staples and open out the four

flaps on the end of the box;

B. Stand the boiler up on its end

as shown, supporting it from

underneath;

C. Lift off the box and remove all

packaging.

STORAGE & HANDLING

Please note that prior to

installation, the boiler should be

stored in the horizontal position

with no more than 5 boilers to a

stack;

Ensure that the boilers are stored

in dry conditions and be aware

that the carton is a two-man lift.

B

C

A

Figure 7: Unpacking instructions

INSTALLATION INSTRUCTIONS

TR05A140.B1107

17

4.3 Installing the boiler

■ The appliance must only be

installed on a flat vertical solid wall

capable of supporting its weight.

■ The boiler should be fitted within the

building unless otherwise protected by

a suitable enclosure i.e. garage or

outhouse.

■ If the boiler is sited in an unheated

enclosure, a permanent live supply

must be provided in order for the frost

protection function to operate. The

appliance can still be switched off

using the ON/OFF button on the

control panel.

■ If the boiler is installed in a room

containing a bath or shower, it must

have a room sealed flue and reference

must be made to the relevant

requirements.

In order to allow access to the interior of

the boiler for maintenance purposes, it is

important that the necessary clearances

indicated in Figure 8 are respected.

For ease of installation, the boiler is

supplied with a template to enable the pipe

connections to be positioned prior to fixing

the appliance to the wall.

To install the boiler, proceed as follows

(see Figure 9):

1 Use a spirit level to mark a horizontal

line on the wall where the boiler is to be

fitted.

2 Position the top of the template along

the line. Mark the centres of fixing

locations and the positions of the water

and gas pipes.

3 Remove the template and install the

gas supply pipe and the central heating

pipes using the fittings supplied with the

boiler.

4 Install the hanging bracket then fix the

boiler to the wall and connect the pipes.

4.3.1 Compartment ventilation

Where the appliance is installed in a compartment, no air vents are required.

BS 5440: Part 2 refers to room sealed appliances installed in compartments. The appliance will run sufficiently cool

without ventilation.

Figure 9: Mounting procedure

Figure 8: Access clearances

X Y L H

10004506060

A B

200 300

H

A

X

L

Y

Model

RKR 29

X Y L H

10004106060

B

A B

200 300

MINIMUM DISTANCE IN m m

X Y L H

10004106060

A B

200 300

INSTALLATION INSTRUCTIONS

TR05A140.B1107

18

14849 182 31

HR G HF

105

4.4 Water connections

In order to comply with the Terms &

Conditions of warranty, the system

must be hot-flushed to remove any

impurities (especially oil and grease)

from the pipes and radiators.

The CH pipes must be adequately

earthed. However, the appliance must

also be provided with an adequate

earth. Pipe work is NOT suitable for this

purpose.

Isolation valves must be installed on

the CH circuit in order to facilitate all

maintenance and service operations

where the boiler needs to be drained.

The boiler is supplied with a fittings kit

(see Figure 11) complete with isolation

valves and copper tails.

■ To prevent vibration and noise coming from

the system, do not use pipes of reduced

diameter, short radius elbows or severe

restrictions.

Figure 11: Fittings kit

HR

G

HF

Ø 22 mm

Ø 15 mm

Ø 22 mm

LEGEND

HR HEATING RETURN 22mm

HF HEATING FLOW 22mm

G

GAS 22mm

CD

CONDENSATE DRAIN 25mm

Figure

10

: Location of connections

22

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