Vokera Linea 726 User guide

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Linea

Installation & Servicing Instructions

THESE INSTRUCTIONS TO BE RETAINED BY USER

Contents

Design principles and operating sequence Page

1.1 Principle components 2

1.2 Mode of operation (at reset) 2

1.3 Mode of operation (Heating) 2

1.4 Mode of operation (DHW) 2

1.5 Safety devices 2

1.6 Optional accessories 2

Technical data Page

2.1 Central heating 3

2.2 Domestic hot water 3

2.3 Gas pressure 3

2.4 Expansion vessel 3

2.5 Dimensions 3

2.6 Clearances 3

2.7 Connections 3

2.8 Electrical 3

2.9 Flue details (concentric) 3

2.9A Flue details (twin pipes) 3

2.10 Efficiency 3

2.11 Pump duty 4

2.12 Emissions 4

General requirements (UK) Page

3.1 Related documents 5

3.2 Location of appliance 5

3.3 Gas supply 5

3.4 Flue system 5

3.5 Air supply 5

3.6 Water circulation 5

3.6.1 Pipework 6

3.6.2 Automatic by-pass 6

3.6.3 Drain cocks 6

3.6.4 Air release points 6

3.6.5 Expansion vessel 6

3.6.6 Filling point 6

3.6.7 Low pressure sealed system 6

3.6.8 Frequent filling 6

3.7 Electrical supply 6

3.8 Showers 6

3.9 Mounting on a combustible surface 6

3.10 Timber framed building 7

3.11 Inhibitors 7

General requirements (EIRE) Page

3.A1 Related documents 7

3.A2 Location of appliance 7

3.A3 Gas supply 7

3.A4 Flue system 8

3.A5 Air supply 8

3.A6 Water circulation 8

3.A6.1 Pipework 8

3.A6.2 Automatic by-pass 8

3.A6.3 Drain cocks 8

3.A6.4 Air release points 8

3.A6.5 Expansion vessel 8

3.A6.6 Filling point 8

3.A6.7 Low pressure sealed system 8

3.A6.8 Frequent filling 8

3.A7 Electrical supply 8

3.A8 Showers 8

3.A9 Mounting on a combustible surface 9

3.A10 Timber framed building 9

3.A11 Inhibitors 9

3.A12 Declaration of conformity 9

Installation Page

4.1 Delivery 9

4.2 Contents 9

4.3 Unpacking 9

4.4 Preparation for mounting the appliance 9

4.5 Fitting the flue 9

4.5.1 Concentric horizontal flue 9

4.5.2 Concentric vertical flue 11

4.5.3 Twin flue system 12

4.6 Connecting the gas and water 14

4.6.1 Gas 14

4.6.2 Flow and return 14

4.6.3 Cold water inlet 14

4.6.4 Hot water outlet 15

4.6.5 Safety valve 15

4.7 Electrical connections 15

4.7.1 Casing removal 15

4.7.2 Appliance terminal block 15

4.7.3 Connecting the mains (230V) input 15

4.7.4 Connecting the Vokera time clock 16

Commissioning Page

5.1 Gas supply installation 17

5.2 The heating system 17

5.3 Initial filling of the system 17

5.4 Initial flushing 17

5.5 Filling the hot water system 17

5.6 Pre-operation checks 17

5.7 Initial lighting 17

5.7.1 Checking burner pressures 17

5.8 Final flushing of the heating system 18

5.8.1 Inhibtors 18

5.9 Setting the boiler operating temperature 18

5.9.1 Setting the domestic hot water temperature 18

5.10 Setting the system design pressure 18

5.11 Regulating the hot water 18

5.11.1 Changing the flow restrictor 18

5.11.2 Regulating the central heating system 18

5.12 Final checks 19

5.13 Instructing the user 19

Servicing instructions Page

6.1 General 19

6.2 Routine annual servicing 19

6.4 Component removal procedure 20

6.5 Pump assembly 20

6.6 Safety valve 20

6.7 Automatic air release valve 20

6.8 Water pressure switch 20

6.9 Pressure gauge 21

6.10 Primary thermistors 21

6.11 H igh limit thermostat 21

6.12 Printed circuit board 21

6.13 Gas valve 22

6.14 Integral time switch 22

6.15 Electrode, burner thermostat, burner & injectors 22

6.16 Flue fan 22

6.17 Main heat exchanger 24

6.18 Air pressure switch 24

6.19 Flow restrictor 24

6.20 DHW flow switch 25

6.21 DHW heat exchanger 25

6.22 Valve actuator 25

6.23 Divertor valve assembly 25

6.24 Secondary thermistor 25

6.25 Automatic by-pass 26

6.26 DHW non-return valve 26

6.27 Expansion vessel 26

6.27.1 Expansion vessel removal 26

6.27.2 Expansion vessel removal 26

Checks, adjustments and fault finding page

7.1 Checking appliance operation 27

7.2 Appliance mode of operation 27

7.2.1 Selector switch in the off position 27

7.2.2 Selector switch in the hot water only position 27

7.2.3 Selector switch in the heating & hot water position 27

7.2.4 Appliance functions 27

7.2.5 Heating mode 27

7.2.6 DHW mode 28

7.3 Checking and adjusting burner pressure 28

7.3.1 Setting the maximum burner pressure 28

7.3.2 Setting the minimum burner pressure 28

7.4 Combustion analysis test 29

7.5 Checking the expansion vessel 29

7.6 External faults 29

7.6.1 Installation faults 29

7.7 Electrical checks 29

7.7.1 Earth continuity test 29

7.7.2 Short circuit test 29

7.7.3 Polarity check 29

7.7.4 Reversed polarity or supply fault 30

7.7.5 Resistance to earth check 30

7.8 Fault finding 30

7.8 Fault codes 31-38

Wiring diagrams Page

8.1 External wiring 39

8.2 Typical control applications 39

8.3 Vokera time clock 39

8.4 Vokera remote control 39

8.5 Vokera room thermostat 39

8.6 Other controls 39

Exploded diagrams Page

Table 1 43 Table 2 44 Table 3 45 Table 4 46 Table 5 47

L.P.G. instructions Page

10.1 Related documents 48

10.3 Converting the appliance gas type 48

10.4 Gas supply 48

10.5 Gas supply installation 48

10.6 Checking and adjusting burner pressure 48

10.6.1 Setting the maximum burner pressure 48

10.6.2 Setting the minimum burner pressure 48

INTRODUCTION

The Linea 7 range is comprised of 3 models of combination boiler – 726, 730, 735 – with outputs to heating & DHW of 26, 30 & 35 kW respectively. Each appliance – by design – incorporates electronic ignition, circulating pump, expansion vessel, safety valve, pressure gauge, and automatic by-pass.

The Linea 7 range are produced as room sealed, category II2H3+ appliances, suitable for internal wall mounting applications only. They are provided with a fan powered flue outlet with an annular co-axial combustion air

26 28

intake that can be rotated – horizontally – through 360 degrees for various horizontal or vertical applications. The Linea 7 range can also be used with the Vokera twin flue system.

The Linea 7 range is approved for use with C12, C22, & C32 type flue applications.

These appliances are designed for use with a sealed system only; consequently they are not intended for use on open vented systems.

Fig.1 General Layout

1 Flue Outlet 2 Air Intake

3 Differential analog Pressure Switch 4 Silicone Pressure Tube 5 Silicone Negative Pressure Tube 6 Expansion Vessel

7 Main Heat Exchanger 8 Electrode 9 Burner Temperature control

10 Transformer 11 Gas Valve 12 Modulator Coil

13 Domestic Heat Exchanger 14 Domestic Hot Water Flow Switch

15 Safety Valve

16 Pressure Switch

17 Diverter Valve Motor 18 Pump

19 Automatic Air Release Valve 20 Main Burner

21 Combustion Chamber 22 Fan Assembly 23 Air Chamber (with front removed) 24 Flue Gas Analysis Test Point 25 Hot Water Temperature Control 26 Mode Selector Switch 27 Status LED 28 Temperature Indicator 29 Central Heating Temperature Control 30 Combustion Switch 31 Timeclock Aperture (optional) 32 Pressure Gauge

Fig. 1

Linea

312730

SECTION 1 DESIGN PRINCIPLES AND OPERATING SEQUENCE

1.1 PRINCIPLE COMPONENTS

●●

● A fully integrated electronic control board fea-

●●

turing electronic temperature control, anti-cycle control, pump over-run, self-diagnostic fault indicator, full air/gas modulation.

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● Low-water-content, copper heat exchanger.

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● Electronic ignition with flame supervision

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● Integral high-head pump

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● Fan

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● Expansion vessel

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● Analogue pressure switch (PAD)

●●

● Water pressure switch

●●

● Two-stage gas valve

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● Pressure gauge

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● Safety valve

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● Burner Temperature control

●●

1.2 MODE OF OPERATION (at rest)

When the appliance is at rest and there are no requests for heating or DHW, the following functions are active:

●●

● Pre-heat function – the pre-heat function ena-

●●

bles the appliance to periodically light and maintain the temperature of the DHW heat exchanger. This “keep-hot” facility enables the appliance to provide an instantaneous response to DHW requests.

●●

● 2-stage frost-protection system – the frost-pro-

●●

tection system protects the appliance against the risk of frost damage. The first stage enables activation of the pump should the temperature of the appliance fall to 7oC. The second stage becomes active when the temperature has dropped to 3oC. Should the second stage become active, the appliance will function on minimum power until it reaches 30oC.

●●

● Anti-block function – the anti-block function ena-

●●

bles the pump and divertor valve actuator, to be energised for short periods, when the appliance has been inactive for more than 19-hours.

1.3 MODE OF OPERATION (Heating)

When there is a request for heat via the programmer/time clock and/or any external control, the pump and fan are started, the fan speed will modulate until the correct signal voltage is received at the control PCB. At this point an ignition sequence is enabled. Ignition is sensed by the electronic circuitry to ensure flame stability at the burner. Once successful ignition has been achieved, the electronic circuitry increases the gas rate to 75% for a period of 15 minutes. Thereafter, the boiler’s output will either be increase to maximum or modulate to suit the set requirement. When the appliance reaches the desired temperature the burner will shut down and the boiler will perform a three-minute anti-cycle (timer delay). When the request for heat has been satisfied the appliance pump and fan may continue to operate to dissipate any residual heat within the appliance.

ensure flame stability at the burner. Once successful ignition has been achieved, the electronic circuitry increases the gas rate to maximum or will modulate output to stabilise the temperature. In the event of the appliance exceeding the desired temperature the burner will shut down until the temperature drops. When the request for DHW has been satisfied the appliance pump and fan may continue to operate to dissipate any residual heat within the appliance.

1.5 SAFETY DEVICES

When the appliance is in use, safe operation is ensured by:

●●

● A water pressure switch that monitors system

●●

water pressure and will de-activate the pump, fan, and burner should the system water pressure drop below the rated tolerance.

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● A high limit thermostat that over-rides the tem-

●●

perature control circuit to prevent or interrupt the operation of the burner.

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● An analogue pressure switch (PAD) that checks

●●

the operation of the fan and flue thereby allowing safe operation of the burner.

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● A safety valve which releases excess pressure

●●

from the primary circuit.

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● Burner Temperature control

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1.6 OPTIONAL ACCESSORIES

The Linea 7 is suitable for use with a range of optional accessories that enable enhanced operation and/or applications. These include:

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● RC05 remote control – the RC05 remote con-

●●

trol enables the appliance to be controlled, adjusted, and monitored from another location or room. The RC05 can also be used as a room thermostat or programmable room thermostat.

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● External sensor – used in conjunction with the

●●

RC05 the external sensor enables the appliance to automatically adjust its outlet flow temperature in response to the outside temperature.

Air Intake

Flue Outlet

1.4 MODE OF OPERATION (DHW)

When there is a request for DHW via a hot water outlet or tap, the pump and fan are started, the fan speed will modulate until the correct signal voltage is received at the control PCB. At this point an ignition sequence is enabled. Ignition is sensed by the electronic circuitry to

Fig. 2

NOTE

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SECTION 2 TECHNICAL DATA

2.1 Central heating 726 730 735

Heat input (kW) 28.2 32.6 37.8 Maximum heat output (kW) 26.0 30.1 35.2 Minimum heat output (kW) 8.28 8.93 9.22 Minimum working pressure 0.45 bar Maximum working pressure 3.0 bar Minimum flow rate 350 l/h

2.2 Domestic hot water

Maximum input (kW) 28.2 32.6 37.8 Maximum output (kW) 26.0 30.1 35.2 Minimum output (kW) 8.28 8.93 9.22 Flow rate (35oC rise) 10.6 l/min 12.3 l/min 14.4 l/min Maximum inlet pressure 6.0 bar Minimum inlet pressure 0.15 bar Minimum flow rate 2.5 l/min

2.3 Gas pressures

Inlet pressure (G20) 20.0 mbar Burner pressure maximum 9.8 mbar 9.6 mbar Burner pressure minimum 1.1 mbar 0.8 mbar 0.7 mbar Maximum gas rate 2.98 m3/h 3.45 m3/h 4 m3/h Minimum gas rate 0.95 m3/h 1.02 m3/h 1.05 m3/h Injector size (quantity) 12 x 1.4 mm 14 x 1.4 mm 16 x 1.4 mm

2.4 Expansion vessel

Capacity 8-litres 10-litres Maximum system volume 76-litres 95-litres Pre-charge pressure 1.0 bar

2.5 Dimensions

Height 820mm Width 400mm 450mm 500mm Depth 350mm Dry weight (kg) 37.0 40.0 46.0

2.6 Clearances

Sides 12mm Top 150mm from casing or 25mm above flue elbow (whichever is applicable) Bottom 150mm Front 600mm

2.7 Connections

Flow & return 22mm Hot & cold water 15mm Gas 15mm Safety valve 15mm

2.8 Electrical

Voltage (V/Hz) 230/50 Power consumption 140W 150W 160W Internal fuse 2A External fuse 3A

2.9 Flue details (concentric)

Maximum horizontal flue length (60/100mm) 4.0m 3.4m 2m Maximum vertical flue length (60/100mm) 4.8m 4.2m 2.8m Maximum horizontal flue length (80/125mm) 10.0m 8.5m 5m Maximum vertical flue length (80/125mm) 10.8m 9.3m 5.8m

2.9A Flue Details (twin pipes)

Maximum horizontal flue length (80mm + 80mm) 14m+14m 14m+14m 7m+7m Maximum vertical flue length (80mm + 80mm) 14m+14m 14m+14m 7.8m+7.8m

2.10 Efficiency

SEDBUK (%) 80.3 80.3 80.3

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SECTION 2 TECHNICAL DATA

2.11 PUMP DUTY

Fig. 3 shows the flow-rate available – af-

600

ter allowing for pressure loss through the appliance – for system requirements.

500

When using this graph, apply only the pressure loss of the system. The graph

400

is based on a 20oC temperature differential.

300

200

Water pressure (mbar)

100

0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400

Fig. 3

2.12 Emissions

Appliance

726 730

NOx max/min 160/140 180/120 150/130

CO max/min 120/120 140/100 130/130

CO2 max/min 6.95/3.45 6.70/3.20 7.0/3.40

CO/CO2 ratio max/min 0.0017 to 1/0.0035 to 1 0.0021 to 1/0.0031 to 1 0.0019 to 1/0.0038 to 1

Fig. 4

Litres Per Hour

735

Key Location Minimum distance

A Below an opening (window, air-brik, etc.) 300 mm B Above an opening (window, air-brik, etc.) 300 mm C To the side of an opening (window, air-brik, etc.) 300 mm D Below gutter, drain-pipe, etc. 75 mm E Below eaves 200 mm

F Below balcony, car-port roof, etc. 200 mm G To the side of a soil/drain-pipe, etc. 150 mm H From internal/external corner or boundary 300 mm

I Above ground, roof, or balcony level 300 mm J From a surface or boundary facing the terminal 600 mm K From a terminal facing a terminal 1200 mm L From an opening in the car-port into the building 1200 mm

M Vertically from a terminal on the same wall 1500 mm N Horizontally from a terminal on the same wall 300 mm

P From a structure to the side of the vertical terminal 300 mm

Q From the top of the vertical terminal to the roof flashing As determined by the fixed collar

of the vertical terminal

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SECTION 3 GENERAL REQUIREMENTS (UK)

This appliance must be installed by a competent person in accordance with the Gas Safety (Installation & Use) Regulations.

3.1 RELATED DOCUMENTS

The installation of this boiler must be in accordance with the relevant requirements of the Gas Safety (Installation & Use) Regulations, the local building regulations, the current I.E.E. wiring regulations, the bylaws of the local water undertaking, the Building Standards (Scotland) Regulation and Building Standards (Northern Ireland) Regulations. It should be in accordance also with any relevant requirements of the local authority and the relevant recommendations of the following British Standard Codes of Practice.

3.2 LOCATION OF APPLIANCE

The appliance may be installed in any room or internal space, although particular attention is drawn to the requirements of the current I.E.E. wiring regulations and in Scotland, the electrical provisions of the Building Regulations, with respect to the installation of the appliance in a room or internal space containing a bath or shower.

3.3 GAS SUPPLY

The gas meter – as supplied by the gas supplier – must be checked to ensure that it is of adequate size to deal with the maximum rated input of all the appliances that it serves. Installation pipes must be fitted in accordance with BS 6891. Pipe work from the meter to the appliance must be of adequate size. Pipes of a smaller size than the appliance gas inlet connection must not be used. The installation must be tested for soundness in accordance with BS6891. If the gas supply serves more than one appliance, it must be ensured that an adequate supply is maintained to each appliance when they are in use at the same time.

3.4 FLUE SYSTEM

The terminal should be located where the dispersal of combustion products is not impeded and with due regard for the damage and discoloration that may occur to building products located nearby. The terminal must not be located in a place where it is likely to cause a nuisance (see fig. 4).

BS 5440 PART 1 FLUES

BS 5440 PART 2 FLUES & VENTILATION

BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS

BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PUR

POSES (2nd FAMILY GASES)

BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW

BS 6891 LOW PRESSURE INSTALLATION PIPES

BS 7074 PART 1 APPLICATION, SELECTION, AND INSTALLTION OF EXPANSION VES

SELS AND ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS

When an appliance is installed in a room or internal space containing a bath or shower, the appliance or any control pertaining to it must not be within reach of a person using the bath or shower. The location chosen for the appliance must permit the provision of a safe and satisfactory flue and termination. The location must also permit an adequate air supply for combustion purposes and an adequate space for servicing and air circulation around the appliance. Where the installation of the appliance will be in an unusual location special procedures may be Necessary, BS 6798 gives detailed guidance on this aspect. A compartment used to enclose the appliance must be designed and constructed specifically for this purpose. An existing compartment/cupboard may be utilised provided that it is modified to suit. Details of essential features of compartment/cupboard design including airing cupboard installations are given in BS 6798. This appliance is not suitable for external installation.

3.4 FLUE SYSTEM (Cont’d.)

In cold and/or humid weather, water vapour may condense on leaving the terminal; the effect of such pluming must be considered. If installed less than 2m above a pavement or platform to which people have access (including balconies or flat roofs) the terminal must be protected by a guard of durable material. The guard must be fitted centrally over the terminal. Refer to BS 5440 Part 1, when the terminal is 0.5 metres (or less) below plastic guttering or 1 metre (or less) below painted eaves.

3.5 AIR SUPPLY

The following notes are intended for general guidance only. This appliance is a room-sealed, fan-flued boiler, consequently it does not require a Permanent air vent for combustion air supply. When installed in a cupboard or compartment, ventilation for cooling purposes is also not required.

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3.6 WATER CIRCULATION

Detailed recommendations are given in BS 5449 Part 1 and BS 6798. The following notes are for general guidance only.

must be fitted with an approved non-return valve and stopcock for isolation purposes. The feed pipe should be connected to the return pipe as close to the boiler as possible.

3.6.1 PIPEWORK

It is recommended that copper tubing to BS 2871 Part 1 is used in conjunction with soldered capillary joints. Where possible pipes should have a gradient to ensure air is carried naturally to air release points and that water flows naturally to drain cocks. Except where providing useful heat, pipes should be insulated to avoid heat loss and in particular to avoid the possibility of freezing. Particular attention should be paid to pipes passing through ventilated areas such as under floors, loft space, and void areas.

3.6.2 AUTOMATIC BY-PASS

The appliance has a built-in automatic by-pass, consequently there is no requirement for an external by-pass, however the design of the system should be such that it prevents boiler ‘cycling’.

3.6.3 DRAIN COCKS

These must be located in accessible positions to facilitate draining of the appliance and all water pipes connected to the appliance. The drain cocks must be manufactured in accordance with BS

2879.

3.6.8 FREQUENT FILLING

Frequent filling or venting of the system may be indicative of a leak. Care should be taken during the installation of the appliance to ensure all aspects of the system are capable of withstanding pressures up to at least 3 bar.

Automatic air-vent

Non-return

valve

Stopcock

Make-up vessel or tank

5.0 metres minimum

3.6.4 AIR RELEASE POINTS

These must be positioned at the highest points in the system where air is likely to be trapped. They should be used to expel trapped air and allow complete filling of the system.

3.6.5 EXPANSION VESSEL

The appliance has an integral expansion vessel to accommodate the increased volume of water when the system is heated. It can accept up to 8 litres (726/730) of expansion from within the system, generally this is sufficient, however if the system has an unusually high water content, it may be necessary to provide additional expansion capacity (see 6.19).

3.6.6 FILLING POINT

A method for initial filling of the system and replacing water lost during servicing etc. has been provided. This method of filling complies with the current Water Supply (Water Fittings) Regulations 1999 and Water Bylaws 2000 (Scotland).

3.6.7 LOW PRESSURE SEALED SYSTEM

Fig. 5

Heating return

3.7 ELECTRICAL SUPPLY

The appliance is supplied for operation on 230V @ 50Hz electrical supply; it must be protected with a 3-amp fuse. The method of connection to the mains electricity supply must allow for complete isolation from the supply. The preferred method is by using a double-pole switch with a contact separation of at least 3mm. The switch must only supply the appliance and its corresponding controls, i.e. time clock, room thermostat, etc. Alternatively an un-switched shuttered socket with a fused 3-pin plug both complying with BS 1363 is acceptable.

3.8 SHOWERS

If the appliance is intended for use with a shower, the shower must be thermostatically controlled and be suitable for use with a combination boiler.

3.9 MOUNTING ON A COMBUSTIBLE SURFACE If the appliance is to be fitted on a wall of combustible material, a sheet of fireproof material must protect the wall.

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3.10 TIMBER FRAMED BUILDINGS

If the appliance is to be fitted in a timber framed building, it should be fitted in accordance with the Institute of Gas Engineers publication (IGE/UP/

7) ‘Guide for Gas Installations in Timber Frame Buildings’.

3.11 INHIBITORS

Vokera recommend that a inhibitor – suitable for use with low water-content, copper heat exchangers – is used to protect the boiler and system from the effects of corrosion and/or electrolytic action. The inhibitor must be administered in strict accordance with the manufacturers* instructions.

*Fernox and Sentinel manufacture products that have proved suitable for use with Vokera appliances. Vokera Ltd. cannot comment on the suitability of any other such product with our appliances.

SECTION 3A GENERAL REQUIREMENTS (EIRE)

This appliance must be installed by a competent person in accordance with and defined by, the Standard Specification (Domestic Gas Installations) Declaration (I.S. 813).

3A.1 RELATED DOCUMENTS

The installation of this boiler must be in accordance with the relevant requirements of the local building regulations, the current ETCI National Rules for Electrical Installations, and the bylaws of the local water undertaking.

It should be in accordance also with any relevant requirements of the local and/or district authority.

3A.2 LOCATION OF APPLIANCE

The appliance may be installed in any room or internal space, although particular attention is drawn to the requirements of the current ETCI National Rules for Electrical Installations, and I.S. 813, Annex K.

When an appliance is installed in a room or internal space containing a bath or shower, the appliance or any control pertaining to it must not be

Fig. 6

within reach of a person using the bath or shower.

The location chosen for the appliance must permit the provision of a safe and satisfactory flue and termination. The location must also permit an adequate air supply for combustion purposes and an adequate space for servicing and air circulation around the appliance. Where the installation of the appliance will be in an unusual location special procedures may be necessary, refer to I.S. 813 for detailed guidance on this aspect.

A compartment used to enclose the appliance must be designed and constructed specifically for this purpose. An existing compartment/cupboard may be utilised provided that it is modified to suit.

This appliance is not suitable for external installation.

3A.3 GAS SUPPLY

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Pipe work from the meter to the appliance must be of adequate size. Pipes of a smaller size than the appliance gas inlet connection must not be used. The installation must be tested for soundness in accordance with I.S. 813.

If the gas supply serves more than one appliance, it must be ensured that an adequate supply is maintained to each appliance when they are in use at the same time.

3A.4 FLUE SYSTEM

In cold and/or humid weather, water vapour may condense on leaving the terminal; the effect of such pluming must be considered.

If installed less than 2m above a pavement or platform to which people have access (including balconies or flat roofs) the terminal must be protected by a guard of durable material. The guard must be fitted centrally over the terminal. Refer to I.S. 813, when the terminal is 0.5 metres (or less) below plastic guttering or 1 metre (or less) below painted eaves.

3A.5 AIR SUPPLY

The following notes are intended for general guidance only. This appliance is a room-sealed, fan-flued boiler, consequently it does not require a permanent air vent for combustion air supply. When installed in a cupboard or compartment, ventilation for cooling purposes is also not required.

3A.6.3 DRAIN COCKS

These must be located in accessible positions to facilitate draining of the appliance and all water pipes connected to the appliance.

3A.6.4 AIR RELEASE POINTS

These must be positioned at the highest points in the system where air is likely to be trapped. They should be used to expel trapped air and allow complete filling of the system.

3A.6.5 EXPANSION VESSEL

The appliance has an integral expansion vessel to accommodate the increased volume of water when the system is heated. It can accept up to 8 litres (726/730) or 10 litres (735) of expansion from within the system, generally this is sufficient, however if the system has an unusually high water content, it may be necessary to provide additional expansion capacity (see 6.19).

3A.6.6 FILLING POINT

A method for initial filling of the system and replacing water lost during servicing etc. has been provided. You should ensure this method of filling complies with the local water authority regulations.

3A.6.7 LOW PRESSURE SEALED SYSTEM

An alternative method of filling the system would be from an independent make-up vessel or tank mounted in a position at least 1 metre above the highest point in the system and at least 5 metres above the boiler (see fig. 5). The cold feed from the make-up vessel or tank must be fitted with an approved non-return valve and stopcock for isolation purposes. The feed pipe should be connected to the return pipe as close to the boiler as possible.

3A.6 WATER CIRCULATION

Specific recommendations are given in I.S. 813. The following notes are for general guidance only.

3A.6.1 PIPEWORK

It is recommended that copper tubing be used in conjunction with soldered capillary joints. Where possible pipes should have a gradient to ensure air is carried naturally to air release points and that water flows naturally to drain cocks. Except where providing useful heat, pipes should be insulated to avoid heat loss and in particular to avoid the possibility of freezing. Particular attention should be paid to pipes passing through ventilated areas such as under floors, loft space, and void areas.

3A.6.2 AUTOMATIC BY-PASS

The appliance has a built-in automatic by-pass, consequently there is no requirement for an external by-pass, however the design of the system should be such that it prevents boiler ‘cycling’.

3A.6.8 FREQUENT FILLING

3A.7 ELECTRICAL SUPPLY

3A.8 SHOWERS

If the appliance is intended for use with a shower, the shower must be thermostatically controlled and be suitable for use with a combination boiler.

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3A.9 MOUNTING ON A COMBUSTIBLE SURFACE

If the appliance is to be fitted on a wall of combustible material, a sheet of fireproof material must protect the wall.

3A.10 TIMBER FRAMED BUILDINGS

If the appliance is to be fitted in a timber framed building, it should be fitted in accordance with I.S. 813 and local Building Regulations. The Institute of Gas Engineers publication (IGE/ UP/7) ‘Guide for Gas Installations in Timber Frame Buildings’ gives specific advice on this type of installation.

3A.11 INHIBITORS

Vokera recommend that a inhibitor – suitable for use with low water-content, copper heat exchang-

SECTION 4 INSTALLATION

ers – is used to protect the boiler and system from the effects of corrosion and/or electrolytic action. The inhibitor must be administered in strict accordance with the manufacturers* instructions. *Fernox and Sentinel manufacture products that have proved suitable for use with Vokera appliances. Vokera Ltd. cannot comment on the suitability of any other such product with our appliances.

3A.12 DECLARATION OF CONFORMITY

A Declaration of Conformity (as defined in I.S.

813) must be provided on completion of the installation A copy of the declaration must be given to the responsible person and also to the gas supplier if required.

4.1 DELIVERY

Due to the weight of the appliance it may be necessary for two people to lift and attach the appliance to its mounting. The appliance is contained within a heavy-duty cardboard carton. Lay the carton on the floor with the writing the correct way up.

4.2 CONTENTS

Contained within the carton is:

●●

● The boiler

●●

● The fixing jig and wall bracket

●●

● Template

●●

● An accessories pack containing appliance serv-

●●

ice connections and washers

●●

● The instruction pack containing the installation

●●

& servicing instructions, user instructions, Benchmark logbook, guarantee registration card, and a 3-amp fuse

gloves should be used to lift the appliance, the appliance back-frame should be used for lifting points.

4.4 PREPARATION FOR MOUNTING THE APPLIANCE

The appliance should be mounted on a smooth, vertical, non-combustible surface, which must be capable of supporting the full weight of the appliance. Care should be exercised when determining the position of the appliance with respect to hidden obstructions such as pipes, cables, etc.

When the position of the appliance has been decided – using the template supplied – carefully mark the position of the combined fixing jig and wall- mounting bracket (see fig. 6) and fluehole (if applicable).

4.5 FITTING THE FLUE

The top flue outlet permits both horizontal and vertical flue applications to be considered, alternatively, the Vokera twin flue system can be utilised if longer flue runs are required.

4.5.1 CONCENTRIC HORIZONTAL FLUE

(For concentric vertical flue, see 4.5.2)

(For twin flue applications, see 4.5.3)

The appliance can be used with either the standard 60/100mm concentric flue system or the optional 80/125mm concentric flue system.

Fig. 6A

4.3 UNPACKING (fig. 6A)

At the top of the carton pull both sides open – do not use a knife – unfold the rest of the carton from around the appliance, carefully remove all protective packaging from the appliance, and lay the accessories etc. to one side. Protective

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NOTE

These instructions relate only to the standard 60/100mm concentric flue system. For specific details on the installation of the 80/125mm concentric flue system please refer to the instructions supplied. The appliance flue outlet elbow can be rotated through 360° on its vertical axis. In addition the flue may be extended from the outlet elbow in the horizontal plane (see 2.9). A reduction must also be made to the maximum length (see table below) when additional bends are used.

Reduction for additional bends

Bend Reduction in maximum flue length for each bend

45° bend 0.5 metre

90° bend 1.0 metre

Horizontal flue terminals and accessories

Part No. Description Min-Max Length

2359029 Standard flue kit. For 833mm

use with add. Bends & (dimension ‘X’)

extensions

2359119 Telescopic flue kit.

2359069 750mm extension 750mm

2359079 1500mm extension 1500mm

2359089 Telescopic extension 350 – 490mm

2359049 45° bend (pair) N/A

2359059 90° bend N/A

0225760 Wall bracket (5) N/A

The telescopic flue kit (part no. 2359119) is suitable for a distance (dimension ’Y’) of up to 600mm.

Dimension ‘Y’ is measured from the end of the terminal to the end of the outer (100mm) pipe.

The internal trim should be fitted to the flue pipe before connection of the 90° bend.

Push-fit connection

Outer 100mm clip

Boiler

Fig. 8

7,5 mm

Inner 60mm clip

Terminal or

extension

Using the template provided, mark and drill a 107mm hole for the passage of the flue pipe. The hole should have a 1° drop from the boiler to outside, to eliminate the possibility of rainwater entering the appliance via the flue.

The fixing holes for the wall-mounting bracket/ fixing jig should now be drilled and plugged, an appropriate type and quantity of fixing should be used to ensure that the bracket/jig is mounted securely. Once the bracket/jig has been secured to the wall, mount the appliance onto the bracket.

Dimension “Y”

110

7,5

Max 833 mm

Dimension “X”

Fig. 7

135 mm

4.5.1.1 FITTING THE HORIZONTAL FLUE KIT (see

4.5.1)

Carefully measure the distance from the centre of the appliance flue outlet to the face of the outside wall (dimension ‘X’ see fig. 7). Ensure the inner (60mm) pipe is fully inserted into the outer (100mm) pipe (when the inner pipe is fully inserted, it stands proud of the outer pipe by

7.5mm). Add 32mm to dimension ‘X’ to give the overall flue length (dimension ‘Y’).

NOTE

The standard horizontal flue kit (part no.

2359029) is suitable for a distance (dimension ‘Y’) of up to 865mm.

Using the dimensions given in fig. 9 as a reference, mark and cut a 105mm hole in the ceiling and/or roof.

Fit the appropriate flashing plate to the roof and insert the vertical flue terminal through the flashing plate from the outside, ensuring that the collar on the flue terminal fits over the flashing.

The fixing holes for the wall-mounting bracket should now be drilled and plugged, an appropriate type and quantity of fixing should be used to ensure that the bracket is mounted securely. Once the bracket has been secured to the wall, mount the appliance onto the bracket

If the horizontal flue kit (2359029) requires to be cut to the correct size (dimension ‘Y’), you must ensure that the inner (60mm) pipe stands proud of the outer (100mm) pipe by 7.5mm (see fig. 8). Ensure any burrs are filed or removed and that any seals are located properly before assembly.

The telescopic flue terminal should be adjusted to the appropriate length and then fixed using the securing screw supplied.

4.5.1.2 STANDARD FLUE KIT (2359029)

Hold the inner (60mm) pipe of the terminal assembly and connect to the push-fit end of the 90° bend (supplied) using a twisting action. Insert the assembled flue into the previously drilled hole. Using the clips & screws supplied, connect the flue assembly to the boiler, ensuring that the terminal protrudes past the finished outside wall by the correct length (135mm).

4.5.1.3 TELESCOPIC FLUE KIT (2359119)

Connect the 60mm push-fit connection of the flue bend (supplied) to the telescopic flue assembly using a twisting action. Insert the assembled flue into the previously drilled hole. Using the clips & screws supplied, connect the flue assembly to the boiler, ensuring that the terminal protrudes past the finished outside wall by the correct length (135mm).

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Fig. 8A

You must ensure that the entire flue system is

properly supported and connected.

Seal the flue assembly to the wall using cement or a suitable alternative that provides satisfactory weatherproofing. The exterior trim can now be fitted.

4.5.1.4 EXTENDING THE HORIZONTAL FLUE

The horizontal flue system can be extended using bends and/or extensions from the Uni-Flue range (see 4.5.1).

Connect the bend – supplied with the terminal kit – to the top of the boiler using the clips, screws, & gaskets supplied. The additional bends & extensions have an internal push-fit connection, care should be taken to ensure that the correct seal is made when assembling the flue system. Connect the required number of flue extensions or bends (up to the maximum equivalent flue length) to the flue terminal using the clips, screws, & gaskets supplied (see fig. 8 & 8A). The interior trim should be fitted at this point.

NOTE

When cutting an extension to the required length, you must ensure that the excess is cut from the plain end of the extension, and that the inner (60mm) pipe is 7.5mm longer than outer (100mm) pipe (see fig. 8 & 8A). Remove any burrs, and check that any seals are located properly.

You must ensure that the entire flue system is properly supported and connected.

Seal the flue assembly to the wall using cement or a suitable alternative that will provide satisfactory weatherproofing. The exterior trim can now be fitted.

an extension or bend can be connected to the appliance flue outlet if desired (see 4.4.2), however if additional bends are fitted, a reduction must be made to the maximum flue length (see table below).

Reduction for bends

Bend Reduction in maximum flue length for each bend

45° bend 0.5 metre

90° bend 1.0 metre

Vertical flue terminal and accessories

Part No. Description Length

2359039 Vertical flue terminal 1.0 metre

0225770 Pitched roof flashing plate N/A

0225765 Flat roof flashing plate N/A

2359069 750mm extension 750mm

2359079 1500mm extension 1500mm

2359049 45° bend (pair) N/A

2359059 90° bend N/A

0225760 Wall bracket (5) N/A

Using the dimensions given in fig. 9 as a reference, mark and cut a 105mm hole in the ceiling and/or roof. Fit the appropriate flashing plate to the roof and insert the vertical flue terminal through the flashing plate from the outside, ensuring that the collar on the flue terminal fits over the flashing. The fixing holes for the wall-mounting bracket should now be drilled and plugged, an appropriate type and quantity of fixing should be used to ensure that the bracket is mounted securely. Once the bracket has been secured to the wall, mount the appliance onto the bracket.

4.5.2 CONCENTRIC VERTICAL FLUE

The appliance can be used with either the standard 60/100mm concentric flue system or the optional 80/125mm concentric flue system.

NOTE

The vertical flue terminal can be connected directly to the appliance flue outlet. Alternatively,

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Fig. 9

IMPORTANT

The vertical flue terminal is 1.0 metre in length and cannot be cut; therefore it may be necessary to adjust the height of the appliance to suit or use a suitable extension. Connect the vertical flue assembly to the boiler flue spigot using the 60mm & 100mm clips, gaskets, & screws (supplied), ensuring the correct seal is made. The flue support bracket (supplied with the vertical flue kit) can now be fitted.

If the vertical flue requires extension/s or additional bend/s, connect the required number of flue extensions or bends (up to the maximum equivalent flue length) between the boiler and vertical flue assembly (see fig. 8).

NOTE

When cutting an extension to the required length, you must ensure that the excess is cut from the plain end of the extension and that the inner (60mm) pipe is 7.5mm longer than outer (100mm) pipe (see fig. 8). Remove any burrs, and check that any seals are located properly. You must ensure that the entire flue system is properly supported and connected.

●●

Ensure that the entire flue system is adequately

●

●●

supported, use at least one bracket for each extension.

●●

● The entire flue system must be adequately in-

●●

sulated to maintain heat within the flue system thereby reducing the possibility of condensate production.

●●

● As the exhaust outlet pipe can reach very high

●●

temperatures it must be protected to prevent persons touching the hot surface.

●●

The condensate drain pipe must be connected

●

●●

in accordance with building regulations

Reduction for bends

Bend Reduction in maximum flue length for each bend

45° bend 1.0 metre

90° bend 1.0 metre

Twin flue accessories

Part No. Description Length

0225805 Horizontal flue terminal 1.0 metre

0225810 Vertical flue terminal 1.0 metre

362 Twin adapter kit N/A

0225770 Pitched roof flashing plate N/A

0225765 Flat roof flashing plate N/A

0225815 Condensate drain kit N/A

0225820 0.25m extension (pair) 250mm

0225825 0.5m extension (pair) 500mm

0225830 1.0m extension (pair) 1000mm

0225835 2.0m extension (pair) 2000mm

0225840 45° bend (pair) N/A

0225845 90° bend (pair) N/A

0225850 Twin bracket (5) N/A

0225855 Single bracket (5) N/A

MOUNTING THE BOILER

4.5.3 TWIN FLUE SYSTEM

The Vokera twin flue system enables greater flue distances to be achieved (see 4.4.2) than that of a concentric flue system. It can be used for horizontal or vertical applications, however the twin flue system must be converted to the dedicated concentric flue kit for termination. It is essential that the installation of the twin flue system be carried out in strict accordance with these instructions.

GUIDANCE NOTES ON TWIN FLUE INSTALLATION

●●

● The flue must have a fall back of 1° back to the

●●

appliance to allow any condensate that may form in the flue system to drain via the condensate drain. Consideration must also be given to the fact that there is the possibility of a small amount of condensate dripping from the terminal.

Fig. 10

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4.5.3.1 INSTALLATION OF TWIN ADAPTOR KIT (fig.

10)

●●

● Insert the exhaust connection manifold onto the

●●

appliance flue outlet.

●●

● Place the silicone seal (supplied with twin

●●

adapter kit) over the rim of the exhaust connection manifold.

●●

● Remove the required blanking plate (located to

●●

the left and right of the appliance flue outlet) and – using the same screws – install the air baffle.

●●

● Using the hole in the exhaust connection mani-

●●

fold as a guide, drill a 3mm hole in the appliance flue spigot and secure the exhaust manifold connection to the flue spigot using the screw provided.

●●

● Connect the air inlet pipe to the air baffle as

●●

above.

●●

● Prime the condensate trap with clean water prior

●●

to commissioning the appliance.

●●

● The twin flue pipes extensions and accesso-

●●

ries can now be installed by pushing together (the plain end of each extension or bend should be pushed approximately 50mm into the female socket of the previous piece).

4.5.3.3 HORIZONTAL TERMINATION (See fig. 12)

The twin flue system must be converted to the

dedicated concentric flue kit for termination.

●●

● The horizontal terminal is supplied with a built-

●●

in converter box and cannot be shortened.

●●

● A 130mm hole is required for the passage of

●●

the concentric terminal through the wall.

●●

● The air inlet pipe must always be level with or

●●

below, that of the exhaust pipe.

Depending on site conditions it may be preferable to install the terminal assembly prior to fitting the twin flue pipes.

Mark and drill a 130mm hole for the passage of the horizontal flue terminal, ensuring that there is a 1° fall back to the boiler (17mm per 1000mm). Insert the terminal assembly into the flue hole.

Push-fit the twin flue pipes onto the concentric to twin converter box ensuring that the exhaust pipe connects to the exhaust connection on the concentric to twin converter.

If necessary cut the plain ends (male) of the twin flue pipes to allow connection to the concentric to twin converter.

NOTE; before cutting twin flue pipes ensure allowances have been made for connection onto the previous piece and onto the concentric to twin converter. The last twin flue pipes must be pushed 50mm onto the male spigots of the concentric to twin converter.

NOTE;

You must ensure that the entire flue system is properly supported and connected.

Seal the flue terminal assembly to the wall using cement or a suitable alternative that will provide satisfactory weatherproofing. The interior and exterior trim can now be fitted.

Fig. 11

4.5.3.2 INSTALLATION OF CONDENSATE DRAIN KIT (fig. 11)

The condensate drain kit must be fitted within 1 metre of the appliance flue outlet. It is recommended that the condensate drain kit should be fitted in the vertical plane, however it can be fitted horizontally with care.

●●

● Fit the first bend to the condensate drain kit or

●●

exhaust connection manifold by firmly pushing in to position.

●●

● Using the two holes in the exhaust connection

●●

manifold as a guide, drill a 3mm hole in each and secure using the screws provided.

Linea

Fig. 12

4.5.3.4 VERTICAL TERMINATION (See fig. 13)

The twin flue system must be converted to the

dedicated concentric flue kit for termination.

●●

● The vertical terminal is supplied with a built-in

●●

converter box and cannot be shortened.

●●

A 130mm hole is required for the passage of

●

●●

the concentric terminal through the ceiling and/ or roof.

Depending on site conditions it may be preferable to install the terminal assembly prior to fitting the twin flue pipes.

Fit the appropriate flashing plate to the roof and insert the vertical flue terminal through the flashing plate from the outside, ensuring that the collar on the flue terminal fits over the flashing.

Push-fit the twin flue pipes onto the concentric to twin converter ensuring that the exhaust pipe connects to the exhaust connection on the concentric to twin converter.

If necessary cut the plain ends (male) of the twin flue pipes to allow connection to the concentric to twin converter.

NOTE

●●

● Before cutting twin flue pipes ensure allowances

●●

have been made for connection onto the previous piece and onto the concentric to twin converter. The last twin flue pipes must be pushed 50mm onto the male spigots of the concentric to twin converter.

●●

● You must ensure that the entire flue system is

●●

properly supported and connected.

●●

● Ensure that any horizontal sections of pipe have

●●

a 1° fall towards the appliance (17mm per 1000mm).

4.6 CONNECTING THE GAS AND WATER

The appliance is supplied with a fixing jig that includes service valves (fig. 14). The service valves are of the compression type. The accessories pack contains sealing washers etc, for use with the service valves.

When connecting pipe work to the valves, tighten the compression end first then insert the sealing washers before tightening the valve to the appliance.

NOTE

It will be necessary to hold the valve with one spanner whilst tightening with another.

Hot water

Outlet

Cold water Inlet

Stopcock/filling

valve

C/H flow

valve

Gas

Cock

Fig. 14

C/H return

valve

Safety valve

outlet

4.6.1 GAS (fig. 6 & 14)

The appliance is supplied with a 15mm service valve, connect a 15mm pipe to the inlet of the valve and tighten both nuts.

NOTE

It will be necessary to calculate the diameter of the gas supply pipe to ensure the appliance has an adequate supply of gas.

4.6.2 FLOW & RETURN (fig. 6 & 14)

The appliance is supplied with 22mm service valves for the flow and return connections, connect a 22mm pipe to the inlet of each valve and tighten both nuts.

NOTE

Depending on system requirements, it may necessary to increase the size of the flow & return pipe work after the service valve connections.

Filling Loop

Fig. 13

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4.6.3 COLD WATER INLET (fig. 6 & 14)

The appliance is supplied with a 15mm combined stopcock and double check-valve, connect a 15mm pipe to the inlet of the stopcock and tighten both nuts.

4.6.4 HOT WATER OUTLET (fig. 6 & 14)

The appliance is supplied with a 15mm outlet connection, connect a 15mm pipe to the outlet connection and tighten both nuts.

4.6.5 SAFETY VALVE (fig. 6 & 14)

Connect the safety valve connection pipe between the safety valve outlet and the fixing jig. Connect a discharge pipe to the fixing jig connection and tighten. The discharge pipe must have a continuous fall away from the appliance to outside and allow any water to drain away thereby eliminating the possibility of freezing. The discharge pipe must terminate in a position where any water – possibly boiling – discharges safely without causing damage or injury, but is still visible.

4.7 ELECTRICAL CONNECTIONS

The electrical supply must be as specified in section 3.7. A qualified electrician should connect the electrical supply to the appliance. If controls – external to the appliance – are required, a competent person must undertake the design of any external electrical circuits, please refer to section 8 for detailed instructions. ANY EXTERNAL CONTROL OR WIRING MUST BE SERVED FROM THE SAME ISOLATOR AS THAT OF THE APPLIANCE. The supply cable from the isolator to the appliance must be 3-core flexible sized

0.75mm to BS 6500 or equivalent. Wiring to the appliance must be rated for operation in contact with surfaces up to 90°C.

4.7.1 CASING REMOVAL

To gain internal access to the appliance you must first remove the casing, proceed as outlined below:

●●

● Press the controls cover to release the controls

●●

cover catch

●●

● Locate and unscrew the 2 screws that secure

●●

the controls fascia to the appliance casing (see fig 15).

●●

● Gently lower the control fascia until it rests.

●●

● Remove the 2 screws located at the Left & Right

●●

of the underside of the casing.

●●

● Lift the casing upward to disengage it from the

●●

top locating hooks and then remove.

●●

● Store the casing and screws safely until re-

●●

quired. Re-fit in the reverse order.

Fig. 15

4.7.2 APPLIANCE TERMINAL BLOCK

The appliance terminal block is located on the left side of the control fascia (see fig. 15). Locate and remove the screws securing the terminal block cover.

NOTE

The appliance comes with a factory fitted link to allow basic operation of the boiler via the mode selector switch. If it is anticipated that external controls will be required please refer to the wiring diagrams in section 8 for more detailed information.

4.7.3 CONNECTING THE MAINS (230V) INPUT (see fig. 16)

Remove the terminal block cover as described in

4.7.2. Pass the cable through the cable anchorage point. At plug M16 on the appliance control PCB there are 7 terminals from Front to Back they are:

1. NEUTRAL

2. NEUTRAL (supply for clock)

3. LIVE

4. LIVE (supply to clock)

5. TA

6. TA

7. (Spare)

Linea

To fit the Vokera time clock:

●●

● Remove the appliance PCB cover.

●●

● Remove and discard the wiring harness sup-

●●

plied with the clock.

●●

Using the clock wiring harness supplied in the

●

●●

accessory pack, connect the 4-wires to the clock as shown in fig 16.

●●

● Remove the clock aperture plate from the ap-

●●

pliance.

●●

● Remove the push-out blanking disc from the

●●

clock aperture plate (fig. 17).

●●

● Secure the clock to the aperture plate using the

●●

screws provided with the clock (fig. 17).

●●

● Refit the clock aperture plate ensuring the clock

●●

is positioned the correct way up.

●●

● Remove the Red link-wire plug from the appli-

●●

ance clock connector plug.

●●

● Connect the clock wiring harness to the clock

●●

connector plug.

●●

● Re-fit the appliance PCB cover and terminal

●●

cover. The securing screw on the cable anchorage should now be tightened. This must be done before the control fascia is re-fitted in the upright position. The appliance casing and screws can now be re-fitted.

Fig. 16

Connect the supply cable wires (LIVE, and NEUTRAL) to their corresponding terminals on the appliance terminal block. Connect the EARTH wire to the EARTH block (see fig. 16) ensuring that it’s left slightly longer that the others, this will prevent strain on the EARTH wire should the cable become taut. Do not remove the link wire (between TA & Spare) unless additional external controls are to be fitted (see section 8).

4.7.4 CONNECTING THE VOKERA TIME CLOCK (part no. 201 & 202)

The appliance is supplied with a clock connector plug that is connected to plug M16 on the appliance terminal block. The clock connector plug is for use with the clock harness that is included in the accessory pack and facilitates an easy connection to the optional Vokera time clock.

Fig. 17

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SECTION 5 COMMISSIONING

5.1 GAS SUPPLY INSTALLATION

Inspect the entire installation including the gas meter, test for soundness and purge. Refer to BS 6891 for specific instruction.

5.2 THE HEATING SYSTEM

The appliance contains components that may become damaged or rendered inoperable by oils and/or debris that are residual from the installation of the system, consequently it is essential that the system be flushed in accordance with the following instructions.

Normal Operating Position

Closed Position

Fig. 18

Filling Position

5.3 INITIAL FILLING OF THE SYSTEM

Ensure both flow and return service valves are

open, remove appliance casing as described in

4.7.1, identify the automatic air release valve and loosen the dust cap by turning the cap anti-clockwise one full turn. IMPORTANT, THERE ARE NO MANUAL AIR RELEASE VALVES LOCATED ON THE APPLIANCE. Ensure all manual air release valves located on the heating system are closed. Connect the filling loop as shown in fig. 14, slowly proceed to fill the system by firstly opening the inlet valve connected to the flow valve, and then turning the lever on the combined stopcock and check valve, to the filling position (see Fig. 18). As water enters the system the pressure gauge will begin to rise. Once the gauge has reached 1 BAR close both valves and begin venting all manual air release valves, starting at the lowest first. It may be necessary to go back and top-up the pressure until the entire system has been filled. Inspect the system for water soundness, rectifying any leaks.

5.4 INITIAL FLUSHING

The whole of the heating system must be flushed both cold and hot as detailed in 5.8. Open all radiator or heating valves and the appliance flow & return service valves. Drain the boiler and system from the lowest points. Open the drain valve

full bore to remove any installation debris from the boiler prior to lighting. Refill the boiler and heating system as described in 5.3.

5.5 FILLING THE HOT WATER SYSTEM

Close all hot water outlets, turn appliance stopcock to the normal operating position (fig. 18), slowly open each outlet until air has been expelled and clear water is discharged. Check pipe-work etc. for water soundness.

5.6 PRE-OPERATION CHECKS

Before attempting the initial lighting of the appliance, the following checks must be carried out:

●●

● Ensure all gas service valves from the meter to

●●

the appliance are open and the supply pipe has been properly purged.

●●

● Ensure the proper electrical checks have been

●●

carried out, (see 7.7) particularly continuity, polarity, and resistance to earth.

●●

● Ensure the 3 AMP fuse – supplied with the ap-

●●

pliance – has been fitted.

●●

● Ensure the system has been filled, vented, and

●●

the pressure set to 1 BAR.

●●

● Ensure the flue system has been fitted prop-

●●

erly and in accordance with the instructions.

●●

● Ensure all appliance service valves are open.

●●

5.7 INITIAL LIGHTING

Ensure the electrical supply to the appliance is switched on. Move the selector switch to the Heating & Hot Water position, ensure the time clock is switched to an ‘ON’ position and ensure any other external controls are also calling for heat.

The appliance will now operate in the pre-heat mode as described in 1.2. Once the pre-heat function has been completed, the appliance will operate in the central heating mode as described in 1.3. Should the appliance fail to ignite, refer to

5.6 and/or section 7 (faultfinding).

5.7.1 CHECKING THE BURNER PRESSURE

Although the burner pressure is factory set, it is necessary to check it during commissioning. Isolate the appliance from the electrical supply and attach a suitable manometer to the gas valve outlet test-point (see fig. 19). Light the boiler as described in 5.7, turn the Hot Water temperature selector to maximum, and open fully a DHW outlet (preferably the bath), allowing the appliance to stabilise. Compare the reading on the manometer with the value described in 2.3. If adjustment is required, follow the detailed instructions in section 7 (7.3).

Linea

Outlet

test-point

Compensator

tube

Protective

cap

To lower the system pressure to the required value, pull lever on head of safety valve to release water until the required figure registers on the pressure gauge (see fig. 1).

5.11 REGULATING THE HOT WATER

The appliance is fitted with a flow rate restrictor that limits the maximum flow rate that can be drawn through the appliance.

Linea 726

8-litre 9-litre 10-litre

(White) (Orange) (Blue)

Spare Fitted Spare

Inlet

test-point

Fig. 19

Once the burner pressure has been checked, close the DHW outlet, isolate the appliance from the electrical supply, remove the manometer, and tighten the gas valve outlet test nipple.

5.8 FINAL FLUSHING OF THE HEATING SYSTEM

The system shall be flushed in accordance with BS 7593. If a cleanser is to be used, it shall be from a reputable manufacturer* and shall be administered in strict accordance with the manufacturers instructions. *Both Sentinel and Fernox manufacture products that have proved suitable for use with Vokera appliances. Vokera Ltd. cannot comment on the suitability of any other such product with our appliances.

5.8.1 INHIBITORS

See Section 3 “general requirements”

5.9 SETTING THE BOILER OPERATING TEMPERATURE

The flow outlet temperature can be adjusted between 40°C - 80°C via the Heating thermostat knob (see fig.1).

5.9.1 SETTING THE DOMESTIC HOT WATER TEMPERATURE

The DHW outlet temperature can be adjusted between 40°C - 65°C via the Hot Water thermostat knob (see fig.1).

5.10 SETTING THE SYSTEM DESIGN PRESSURE

The design pressure should be a minimum of 1 BAR and a maximum of 1.5 BAR. The actual reading should ideally be 1BAR plus the equivalent height in metres (0.1 BAR = 1 metre) to the highest point in the system above the base of the appliance (up to the maximum of

1.5 BAR total). N.B. The safety valve is set to lift at 3 BAR/30 metres/45 psig.

Linea 730

9-litre 10-litre 11-litre

(Orange) (Blue) (Beige)

Spare Fitted Spare

Linea 735

11-litre 12-litre 13-litre

(Beige) (Red) (Olive)

Spare Fitted Spare

The restrictor eliminates the need to manually adjust the DHW flow rate. However if it is felt necessary to further increase or decrease the available flow rate, spare restrictors are included in the accessory pack. The spare flow rate restrictors can be fitted to either increase or decrease the maximum flow rate. The tables above denote the size of restrictor fitted and the spare restrictors supplied in the accessory pack. Each restrictor is colourcoded to enable identification.

5.11.1 CHANGING THE FLOW RESTRICTOR

Refer to 6.19 for detailed instruction on changing the flow restrictor.

5.11.2 REGULATING THE CENTRAL HEATING SYSTEM

Fully open all radiator and circuit valves and run the appliance for both heating and hot water until heated water is circulating. If conditions are warm remove any thermostatic heads. Adjust radiator return valves and any branch circuit return valves until the individual return temperatures are correct and are approximately equal.

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5.12 FINAL CHECKS

●●

● ENSURE ALL TEST NIPPLES ON THE AP-

●●

PLIANCE GAS VALVE HAVE BEN TIGHTENED AND CHECKED FOR SOUNDNESS.

●●

● ENSURE THE APPLIANCE FLUE SYSTEM

●●

IS FITTED CORRECTLY AND IS PROPERLY SECURED.

●●

● ENSURE ALL PIPE WORK IS RE-CHECKED

●●

FOR SOUNDNESS.

●●

● RE-FIT APPLIANCE CASING.

●●

● COMPLETE APPLIANCE LOGBOOK.

●●

Complete details of the boiler, controls, installation, and commissioning in the logbook supplied with the boiler. This is an important document, which must be correctly completed and handed to the user. Failure to install and commission the appliance to the manufacturers instructions may invalidate the warranty.

SECTION 6 SERVICING

5.13 INSTRUCTING THE USER

Hand over all documentation supplied with this appliance – including these instructions – and explain the importance of keeping them in a safe place. Explain to the user how to isolate the appliance from the gas, water, and electricity supplies, and the locations of all drain points. Show the user how to operate the appliance and any associated controls correctly. Show the user the location of the filling valve and how to top-up the system pressure correctly, and show the location of all manual air release points. Explain to the user how to turn off the appliance for both long and short periods and advise on the necessary precautions to prevent frost damage. Explain to the user that for continued safe and efficient operation, the appliance must be serviced annually by a competent person.

6.1 GENERAL

To ensure the continued safe and efficient operation of the appliance, it is recommended that it is checked and serviced at regular intervals. To ensure correct and safe operation of the appliance, it is essential that any worn or failed component be replaced only with a genuine Vokera spare part. The frequency of servicing will depend upon the particular installation conditions, but in general, once per year should be adequate. It is the law that any servicing work is carried out by competent person such as a Vokera engineer, an approved service agent, British Gas, or other CORGI registered personnel. The following instructions apply to the appliance and its controls, but it should be remembered that the central heating and the domestic hot water systems would also require attention from time to time.

6.2 ROUTINE ANNUAL SERVICING

Check the operation of the appliance and ensure it functions as described in section 7. Compare the performance of the appliance with its design specification. The cause of any noticeable deterioration should be identified and rectified without delay. Thoroughly inspect the appliance for signs of damage or deterioration especially the flue system and the electrical apparatus. Check and adjust – if necessary – all burner pressure settings. (See 7.3) Check and adjust – if necessary – the system design pressure. (See 5.10) Carry out an analysis of the flue gases (see 7.4), and visually check the condition of the entire flue assembly. Compare the results with the appliance design specification. Any deterioration in

performance must be identified and rectified without delay. Ensure both flue venturis are clean and free from any debris or obstruction. Ensure both the burner and heat exchanger are clean and free from any debris or obstruction.

6.3 REPLACEMENT OF COMPONENTS

Although it is anticipated that this appliance will give years of reliable, trouble free service, the life span of components will be determined by factors such as operating conditions and usage. Should the appliance develop a fault, the fault finding section will assist in determining which component is malfunctioning.

Linea

6.4 COMPONENT REMOVAL PROCEDURE

To remove a component, access to the interior of the appliance is essential. Isolate the appliance from the electrical supply and remove the fuse. And when necessary, close all service valves on the appliance, remove the appliance casing as described in section 4.7.1, and drain the water content from the appliance via the safety valve. Ensure some water absorbent cloths are available to catch any residual water that may drip from the appliance or removed component. Undertake a complete commissioning check as detailed in section 5, after replacing any component.

ALWAYS TEST FOR GAS SOUNDNESS IF ANY GAS CARRYING COMPONENTS HAVE BEEN REMOVED OR DISTURBED.

6.5 PUMP ASSEMBLY fig. 20

Carry out component removal procedure as described in 6.4. Disconnect and remove the ancillary items (3,4,5,6,7) from the pump assembly. Slacken and remove the securing screw (8) from the heating manifold. Disconnect the electrical cover & lead (1,2). The pump assembly can now be removed from the heating manifold. Replace in the reverse order.

Fig. 21

6.7 AUTOMATIC AIR RELEASE VALVE fig. 20 (AAV)

Carry out component removal procedure as described in 6.4. Using a suitable pair of pump pliers, unscrew the AAV from the rear of the pump assembly. Replace in the reverse order.

Fig. 20

6.6 SAFETY VALVE fig. 21

Carry out component removal procedure as described in 6.4. Disconnect the outlet pipe from the safety valve, remove safety valve locking screw (1) from the heating manifold. Replace in the reverse order.

6.8 WATER PRESSURE SWITCH fig. 22

Carry out component removal procedure as described in 6.4. Remove locking screw (1) and the water pressure switch from the heating manifold, and – after taking note of the electrical connections – disconnect the wiring. Replace in the reverse order.

Fig. 22

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6.9 PRESSURE GAUGE fig. 23

Carry out component removal procedure as described in 6.4. Remove pressure gauge locking screw (1), located on pump base, and withdraw the pressure gauge pipe (2), locate the spring tabs on the pressure gauge body, push and hold tabs in, to enable extraction of the gauge from its location. Replace in the reverse order.

6.10 PRIMARY THERMISTOR fig. 24

Carry out component removal procedure as described in 6.4. Unclip and remove the air chamber cover, and remove the right side air baffle. Disconnect thermistor electrical plug. Using a 13mm spanner slacken and remove the thermistor and sealing washer (1,2) from the main heat exchanger. Replace in the reverse order.

Fig. 23

Fig. 25

6.11 HIGH LIMIT THERMOSTAT fig. 25

Carry out component removal procedure as described in 6.4. Unclip and remove the air chamber cover. Pull off electrical connections from the high limit thermostat (2), slacken and remove retaining screws (3). Replace in reverse order.

6.12 PRINTED CIRCUIT BOARD fig. 26

Carry out component removal procedure as described in 6.4. Locate and remove the screws (1) which secure the PCB cover & terminal cover, then remove cover, after carefully taking note of all wiring connections, disconnect all wiring from the PCB, locate and remove the PCB securing screws (2,3,), remove the required PCB (4,5,6). Replace in the reverse order.

Fig. 24

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Fig. 26

NOTE

Ensure that any replacement PCB has the correct ‘Jumper Tag’ configuration (see section 8).

6.13 GAS VALVE fig. 27

Carry out component removal procedure as described in 6.4. The gas valve must be changed as complete unit. Disconnect the electrical plug and leads from the gas valve. Slacken and unscrew gas valve inlet and outlet connections (3). Please note, the seal- ing washers (2) must be discarded and replaced with new sealing washers (2). Locate and remove gas valve retaining screws on the underside of the boiler if required, the gas valve can now be removed. Replace in the reverse order. Check and adjust burner pressure settings. WARNING,

A GAS SOUNDNESS CHECK MUST BE CARRIED OUT.

electrode lead and burner thermostat from their respective connectors. Ease the electrode sealing grommet from its seating (4). Remove the retaining screw for the burner thermostat and remove the thermostat FIG. 29, Locate and remove the four screws which secure the burner in position (1), gently ease the burner out of its location Once the burner has been removed, the electrode retaining screw can be can be removed. Locate the burner injectors (2) and remove (if necessary). Replace in the reverse order. Please note, the injector sealing washers (3) must be replaced if the injectors have been removed, ensure all seals are in good condition, taking care to ensure they are replaced correctly. Replace in the reverse order.

Fig. 27

6.14 INTEGRAL TIME SWITCH (if fitted)

Carry out component removal procedure as described in 6.4. Locate and remove the terminal cover and securing screws (2), locate and remove the time clock retaining screws, remove time clock. Disconnect wiring after carefully taking note of all electrical connections. Replace in the reverse order.

6.15 ELECTRODE, BURNER THERMOSTAT, BURNER, & INJECTORS fig. 28

Carry out component removal procedure as described in 6.4. Unclip and remove the air chamber cover (2). Locate and remove the screws securing the front combustion cover (3), pull the cover towards you before lifting and disengaging. Disconnect the

Fig. 28

6.16 FLUE FAN fig. 30

Carry out component removal procedure as described in 6.4. Unclip and remove the air chamber cover, gently pull the cover towards you before lifting and disengaging. Locate and remove the six screws that secure the front combustion cover (2), then remove the cover. Disconnect the electrical connections and silicone tubes (5) attached to the fan, noting their positions. Locate and remove the three screws that secure the flue hood and air baffles (3,4,7), disconnect the flue clip (6) from the fan-flue elbow, ease the fan & flue hood assembly from its location. Locate and remove the four screws (8) that secure the fan to the flue hood. Remove the fan to flue elbow (10). Replace in the reverse order. Ensure all seals are in good condition, taking care to ensure they are replaced correctly.

Linea

Fig. 29

Fig. 30

Linea

Fig. 31

6.17 MAIN HEAT EXCHANGER fig. 31

Carry out component removal procedure as described in 6.4. Unclip and remove the air chamber cover, gently pull the cover towards you before lifting and disengaging. Locate and remove the six screws (2) that secure the front combustion cover, then remove the cover. Remove the air chamber side panels if necessary by unscrewing the securing screws (3). Disconnect the flow and return connections (4,5) on the heat exchanger. The heat exchanger can now be withdrawn from the appliance. Replace in the reverse order. Ensure all seals are in good condition, taking care to ensure they are replaced correctly.

6.18 AIR PRESSURE SWITCH fig. 32

6.19 FLOW RESTRICTOR fig. 33

Carry out the component removal procedure as described in 6.4. Slacken the cold water inlet pipe (1) at the DHW flow switch. Disconnect the cold-water inlet pipe (2) from the DHW heat exchanger and move it to the side. Using a small screwdriver, gently ease the flow restrictor (6) from its seating. Replace in the reverse order. Ensure all seals are in good condition, taking care to ensure they are replaced correctly.

Fig. 32

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6.22 VALVE ACTUATOR fig. 35

Carry out component removal procedure as described in 6.4. Remove the locking pin (1) that secures the actuator to the heating manifold. Disconnect the electrical plug (2) from the actuator. Replace in the reverse order.

Fig. 33

6.20 DHW FLOW SWITCH fig. 33

Carry out component removal procedure as described in 6.4. Disconnect and remove the cold water inlet pipe (1,2) from the DHW flow switch & DHW heat exchanger. Disconnect the wiring to the DHW flow switch. Remove the locking pin (3) from the DHW flow switch and lift the DHW flow switch housing from its seating, taking care not to lose the float contained within the housing. Replace in the reverse order ensuring that the housing is firmly inserted onto its seating. Ensure all seals are in good condition, taking care to ensure they are replaced correctly.

6.21 DHW HEAT EXCHANGER

Carry out component removal procedure as described in 6.4. Locate and remove the screws (1) that secure the heat exchanger to the DHW manifolds. Carefully remove the heat exchanger from its location taking care not to spill any residual water. Replace in the reverse order ensuring that the heat exchanger ‘O’ ring seals are correctly inserted into the DHW manifolds. Ensure all seals are in good condition, taking care to ensure they are replaced correctly.

Fig. 34

Fig. 35

6.23 DIVERTOR VALVE ASSEMBLY Fig. 36

Carry out component removal procedure as described in 6.4. Remove the valve actuator as described in 6.22. Locate and remove the 5-screws (2) that secure the valve housing cover to the heating manifold. Gently prise the valve seating assembly and cover (3) from the manifold. Replace in the reverse order ensuring that the seating assembly is inserted properly. . Ensure all seals are in good condition, taking care to ensure they are replaced correctly.

Fig. 36

6.24 SECONDARY THERMISTOR fig. 37

Carry out component removal procedure as described in 6.4. Pull back the protective cover from the thermistor and disconnect the electrical plug. Using a 13mm spanner slacken and remove the thermistor and sealing washer from the DHW heat exchanger manifold. Replace in the reverse order.

Fig. 37

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6.25 AUTOMATIC BYPASS fig. 38

Carry out component removal procedure as described in 6.4. Disconnect and remove the flow pipe at the heating manifold & DHW manifold (1), and at the connection to the air chamber. Using a hooked piece of wire, carefully withdraw the bypass cartridge (2). Ensure all seals are in good condition, taking care to ensure they are replaced correctly. Replace in the reverse order ensuring the cartridge is facing the correct way.

Fig. 38

6.26 DHW NON-RETURN VALVE fig. 39

Carry out component removal procedure as described in 6.4. Disconnect and remove the flow pipe at the heating and DHW manifold (1), and at the connection to the air chamber. Using a hooked piece of wire, carefully withdraw the non-return cartridge (2). Ensure all seals are in good condition, taking care to ensure they are replaced correctly. Replace in the reverse order ensuring the cartridge is facing the correct way.

6.27.1 EXPANSION VESSEL REMOVAL (with sufficient clearance above)

Carry out component removal procedure as described in 6.4. Disconnect the flue from the appliance. Disconnect the flexible expansion pipe from the vessel (Fig. 40). Locate and remove the four screws that secure the vessel top holding plate, remove the plate. The expansion vessel can now be removed. Replace in the reverse order. Ensure all seals are in good condition, taking care to ensure they are replaced correctly.

6.27.2 EXPANSION VESSEL REMOVAL (with insufficient clearance above)

Carry out component removal procedure as described in 6.4. Disconnect the flue elbow or pipe from the appliance flue outlet. Unclip and remove the air chamber cover, gently pull the cover towards you before lifting and disengaging. Remove the RH side panel of the air chamber. Disconnect the wiring to the fan, pressure switch, primary thermistor, & overheat thermostat. Carefully unclip the wires from the air chamber and withdraw the wiring & grommet from the air chamber. Disconnect the electrode lead and burner thermostat wires Disconnect the outlet gas pipe and the flow & return pipes from the air chamber. Locate and remove the 2-screws that secure the lower section of the air chamber. Locate and remove the 2-screws that secure the upper section of the air chamber. The complete air chamber assembly can now be lifted clear from the appliance. Disconnect the flexible expansion pipe from the vessel (fig. 40). Locate and remove the 2screws that secure the vessel (1). The expansion vessel can now be removed. Replace in the reverse order. Take extreme care when refitting the wiring to the air chamber. Ensure all seals are in good condition, taking care to ensure they are replaced correctly.

Fig. 39

6.27 EXPANSION VESSEL fig. 1

Should the removal and replacement of the expansion vessel be deemed impractical, an external expansion vessel may be fitted to the return pipe as close to the appliance as possible.

Fig. 40

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SECTION 7 CHECKS, ADJUSTMENTS AND FAULT FINDING

7.1 CHECKING APPLIANCE OPERATION

When carrying out any repairs or servicing to the appliance, the relevant commissioning procedure must be undertaken to ensure the continued safe operation of the appliance. Particular attention should be made to ensure gas soundness, water soundness, and the electrical integrity of the appliance.

7.2 APPLIANCE MODE OF OPERATION NOTE there must be sufficient system water pres-

sure (min. 0.5 bar) to ensure the water pressure switch is activated. If there is insufficient system pressure the pump and fan will be prevented from operating.

7.2.1 SELECTOR SWITCH IN THE OFF POSITION

When the selector switch is in the OFF position, there is no LED display or LED status indicator. The divertor valve is in the DHW position. The appliance will not respond to any DHW or heating requests.

Active Functions:

●●

● Frost-protection system.

●●

● Pump anti-block.

●●

● Valve actuator anti-block.

●●

7.2.2 SELECTOR SWITCH IN THE HOT WATER ONLY POSITION

When the selector switch is in the HW only position, the status LED is illuminated and the LED display shows the current temperature measured at the secondary (DHW) thermistor. The divertor valve is in the DHW position. The appliance will respond to any DHW requests.

Active Functions:

●●

● DHW pre-heat.

●●

● Frost-protection system.

●●

● Pump anti-block.

●●

● Valve actuator anti-block.

●●

7.2.3 SELECTOR SWITCH IN THE HEATING & HOT WATER POSITION

When the selector switch is in the Heating & HW position, the status LED is illuminated and the LED display shows the current temperature measured at the secondary (DHW) thermistor. The divertor valve is in the DHW position. The appliance will respond to any Heating or DHW requests.

Active Functions:

●●

● DHW pre-heat.

●●

● Frost-protection system.

●●

● Pump anti-block.

●●

● Fan anti-block

●●

● Valve actuator anti-block.

●●

7.2.4 APPLIANCE FUNCTIONS

●●

● DHW pre-heat, this function is only active when

●●

there are no requests for heating or hot water. When the secondary thermistor drops to 35oC, the pre-heat function is enabled, the appliance operates on minimum power until the secondary thermistor reaches 55oC. Thereafter the pump and fan will over-run for 10-seconds.

●●

● Frost-protection, this function is only active

●●

when there are no requests for heating or HW. Should the temperature of the primary thermistor drop below 7oC, the valve actuator will motor to the heating position, and the pump will be activated for approximately 20-minutes. Should the temperature of the primary thermistor exceed 10oC during this period, the cycle will be aborted. If the temperature drops below 4oC, the boiler will operate on minimum power until the temperature of the primary thermistor reaches 30oC. Thereafter the pump & fan will over-run for 30-seconds.

●●

● Anti-block cycle, when there has been no

●●

heating or HW request for 19-hours, the antiblock cycle is activated. The valve actuator will motor from the DHW position to the heating position for a period of 10-seconds and then motor back to the DHW position. Thereafter the pump will be activated for a period of 1-minute. If the selector switch is in the Heating & HW position, the fan will also be active for 1-minute.

7.2.5 HEATING MODE

With the selector switch in the Heating & HW position and any additional controls (time clock, room thermostat, etc,) calling for heat, the appliance will operate in the heating mode. The valve actuator will motor to the heating position and the pump and fan will be active. The operation of the fan causes the analogue pressure switch (PAD) to deliver a signal voltage to the control PCB. If the signal voltage is sufficient a slow ignition sequence is enabled, whereby the current supplied to the gas valve modulating coil is progressively increased from minimum to maximum over a period of 8-seconds. During this period the ignition electrode sparks continuously even if the burner has ignited.

NOTE

Linea

If the temperature continues to rise and exceeds the set-point by 6oC, the burner will shut down and the boiler will perform a three-minute anticycle (timer delay). A new ignition sequence will be enabled when the 3-minute anti-cycle has been performed and the temperature at the primary thermistor has dropped 6oC below the set-point.

NOTES

The timer delay can be de-activated by the insertion of a ‘jumper’ on the PCB or by isolating the appliance from the electrical supply for 30 seconds. Any DHW request will always have priority over the heating request. When the request for heating has been satisfied, the appliance pump and fan may continue to circulate to dissipate any residual heat within the appliance.

7.2.6 DHW MODE

With the selector switch in the Heating & HW position, or HW only position, and a DHW outlet is opened, the appliance will operate in the HW mode. The valve actuator will motor to the HW position (if a heating request was active) and the pump and fan will be active. The operation of the fan causes the analogue pressure switch (PAD) to deliver a signal voltage to the control PCB. If the signal voltage is sufficient a slow ignition sequence is enabled, whereby the current supplied to the gas valve modulating coil is progressively increased from minimum to maximum over a period of 8-seconds. During this period the ignition electrode sparks continuously even if the burner has ignited.

NOTE

If the spark/sensing electrode does not sense ignition the appliance will then go to lockout. Ignition is sensed by the electronic circuitry to ensure flame stability at the burner. Once successful ignition has been achieved, the electronic circuitry modulates the appliance output in order to achieve the DHW set-point (the position of the DHW temperature selector) as measured at the secondary thermistor. When the set-point has been reached, the appliance will begin the modulation phase whereby the fan and gas valve will continuously modulate to maintain the set-point. If the temperature continues to rise and exceeds the set-point by 5oC, the burner will shut down until the temperature drops to set-point + 4oC, whereby a new ignition sequence will be enabled. When the request for heating has been satisfied, the appliance fan may continue to operate to dissipate any residual heat from within the appliance.

Isolate the appliance from the electrical supply and attach a suitable manometer to the gas valve outlet test nipple.

7.3.1 SETTING THE MAXIMUM BURNER PRESSURE fig. 41

Light the boiler as described in 5.7 and compare the reading on the manometer with the value described in 2.3. If adjustment is required, remove the protective cap from the gas valve modulating coil assembly and turn the outer (10mm) nut clockwise to increase, or counter-clockwise to decrease the burner pressure.

Fig. 41

NOTE

Always check and/or adjust the minimum and maximum gas pressures whilst the appliance is in the HW only mode. Ensure a DHW outlet (preferably the bath) is fully open, and that the HW temperature selector is at maximum

7.3.2 SETTING THE MIMIMUM BURNER PRESSURE fig. 42

Once the maximum burner pressure has been checked and/or adjusted, remove one of the grey wires from the modulating coil. Compare the reading on the manometer with the value described in 2.3. If adjustment is required, turn the inner (red) crosshead screw clockwise to increase, or counter-clockwise to decrease the burner pressure, whilst ensuring that the outer (10mm) nut does not move. When checking and/or adjustment has been completed, isolate the appliance from the electrical supply, replace the protective cap, refit the grey wire to the modulating coil, remove the manometer, and tighten the outlet test nipple.

IMPORTANT, A GAS SOUNDNESS CHECK MUST BE CARRIED OUT.

7.3 CHECKING AND ADJUSTING BURNER PRESSURE (see fig. 19)

Although the burner pressure is factory set, it is necessary to check it during servicing or if the gas valve has been removed.

Fig. 42

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Protecting cap

7.6.1 INSTALLATION FAULTS

Symptom Possible causes

No ignition Check wiring

Check electrical supply

No hot water Check hot/cold pipe

work is not reversed

No central heating Check wiring of time clock

and/or room thermostat

Air analysis outlet Fumes analysis outlet

Fig. 43

7.4 COMBUSTION ANALYSIS TEST

A combustion analysis check can easily be carried out on the appliance via the test points located on the top of the appliance, however you must check that the burner pressures are set correctly (see 7.3).

●●

● Insert the flue gas analyser probe into the right

●●

hand test point (see fig 43).

●●

● Locate and remove the protective cap that con-

●●

ceals the ‘CO mode’ button (see fig. 43).

●●

● Light the boiler as described in 5.7 and press

●●

the ‘CO mode’ button once.

●●

● The boiler will now enter the combustion analy-

●●

sis mode (CO mode) for a period of 15 minutes. During this time it will remain on full gas and ‘CO’ will be displayed on the LED display.

●●

● Once the flue gas analysis has been made,

●●

press the ‘CO mode’ to resume normal operation.

7.5 CHECKING THE EXPANSION VESSEL

Carry out the component removal procedure as described in 6.4. You must ensure that the boiler is completely drained of water. Using a suitable pressure gauge, remove dust cap on expansion vessel and check the charge pressure. The correct charge pressure should be

1.0 bar ± 0.1 bar. If the charge pressure is less, use a suitable pump to increase the charge.

NOTE

You must ensure the safety valve is in the open position whilst re-charging takes place. Replace the dust cap and carry out the relevant commissioning procedure (section 5).

7.6 EXTERNAL FAULTS

Before carrying out any faultfinding or component replacement, ensure the fault is not attributable to any aspect of the installation.

Fault code Possible causes

01 Gas supply problem

Gas line requires purging

Reversed polarity

Broken, internal flue joint

02 Flow/return valves closed

Stuck pump

03 Debris in flue system

Debris in flue venturi

04 Insufficient water pressure

Air in boiler

7.7 ELECTRICAL CHECKS

Any electrical checks must be carried out by a suitably qualified person.

7.7.1 EARTH CONTINUITY TEST

Isolate the appliance from the electrical supply, and using a suitable multi-meter carry out a resistance test. Connect test leads between an appliance earth point and the earth wire of the appliance supply cable. The resistance should be less than 1 OHM. If the resistance is greater than 1 OHM check all earth wires and connectors for continuity and integrity.

7.7.2 SHORT CIRCUIT CHECK

Isolate the appliance from the electrical supply, and using a suitable multi-meter, carry out a short circuit test between the Live & Neutral connections at the appliance terminal strip (fig.16). Repeat above test on the Live & Earth connections at the appliance terminal strip (fig.16).

NOTE

Should it be found that the fuse has failed but no fault is indicated, a detailed continuity Check will be required to trace the fault. A visual inspection of components may also assist in locating the fault.

7.7.3 POLARITY CHECK

With the appliance connected to the electrical supply and using a suitable multimeter, carry out the following voltage tests: Connect test leads between the Live & Neutral connections at the appliance terminal strip (fig.16). The meter should read approximately 230V ac. If so proceed to next stage. If not, see

7.7.4. Connect test leads between the Live & Earth connections at the appliance terminal strip (fig.16). The meter should read approximately 230V ac.

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If so proceed to next stage. If not, see 7.7.4. Connect test leads between the Neutral & Earth connections at the appliance terminal strip. (fig.16) the meter should read approximately 0 – 15Vac. If so polarity is correct. If not, see 7.7.4.

7.7.4 REVERSED POLARITY OR SUPPLY FAULT

Repeat the above tests at the appliance isolator, if testing reveals correct polarity and/or supply at the isolator, re-check wiring and connections between the isolator and the appliance. If tests on the isolator also reveal reversed polarity or a supply fault, consult the local electricity supplier for advice.

7.7.5 RESISTANCE TO EARTH CHECK

Isolate the appliance from the electrical supply, and using a suitable multi-meter carry out a resistance test. Connect test leads between the Live & Earth connections at the appliance terminal strip. (fig.16) If the meter reads other than infinity there is a fault that must be isolated, carry

out a detailed continuity check to identify the location of the fault.

IMPORTANT

These series of checks must be carried out before attempting any faultfinding procedures on the appliance. On completion of any task that required the disconnection and re-connection of any electrical wiring or component, these checks must be repeated.

7.8 FAULT FINDING

Before attempting any faultfinding, the electrical checks as detailed in 7.7 must be carried out. Isolate the appliance from the electrical supply. Disconnect any external controls from terminals TA & Spare of the appliance terminal strip, and make safe. Insert a solid link-wire between terminals TA & TA. Ensure jumper tags are fitted to the main PCB at:

●●

● JP6

●●

● JP7

●●

● JP8 (Nat. Gas only).

●●

● M7

●●

NOTE

If the Vokera remote-control (RC05) is connected to the appliance, it should be disconnected during any faultfinding checks. Restore the electrical supply to the boiler and turn the selector switch to the on position. The boiler should now function as described in section 7.2. Should the boiler fail to respond, the internal fuses and connectors should be checked to ensure integrity and continuity. If the boiler still fails to respond, refer to the detailed faultfinding flowcharts overleaf.

7.9 FAULT CODES

When the boiler displays a fault code, the appropriate code is shown on the display, accompanied by a flashing red LED. To reset the boiler, slowly turn the mode selector switch to the reset position then back to the on position. If the boiler does not reset, refer to the following section and the detailed faultfinding flowcharts overleaf.

FAULT CODE 01

Fault code 01 appears when the burner has failed to ignite, or the flame supervision system has failed to detect a flame.

●●

● Check incoming gas supply

●●

● Check spark electrode

●●

● Check polarity

●●

● Check integrity of flue system

●●

● Check gas valve

●●

Check ignition control PCB

●

●●

FAULT CODE 02

Fault code 02 appears if the boiler has overheated.

●●

●

Check high limit thermostat

●●

●

Check thermistors

●●

●

Check pump

●●

●

Check gas pressures

●●

FAULT CODE 03

Fault code 03 appears if the boiler or flue system has developed a fault.

●●

●

Check operation of fan

●●

●

Check flue venturi

●●

●

Check analogue pressure switch

●●

●

Check flue system

●●

FAULT CODE 04

Fault code 04 appears if the pressure in the boiler is low.

●●

●

Check water pressure

●●

●

Check water pressure switch

●●

●

Check water pressure gauge

●●

FAULT CODE 05

Fault code 05 appears if the appliance is connected to the optional remote control (RC05) and there is a communication problem.

●●

●

Check wiring between RC05 and appliance

●●

FAULT CODE 06

Fault code 06 appears if a problem exists with the secondary (DHW) thermistor.

●●

●

Check thermistor

●●

●

Check wiring continuity

●●

FAULT CODE 07

Fault code 07 appears if a problem exists with the primary thermistor.

●●

●

Check thermistor

●●

●

Check wiring continuity

●●

FAULT CODE 08

Fault code 08 appears if the burner thermostat has been activated.

●●

●

Check gas pressures

●●

●

Check burner thermostat

●●

●

Check wiring continuity

●●

FAULT CODE 09

PCB fault

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VOKERA

LINEA PLUS AG

Rev. 1 08/03/2000

TEST A : CHECKING OPERATION OF ELECTRONIC

CONTROL BOARD AT START UP

MAINS

ON 3 WAY

VALVE BETWEEN

TERMINALS

M11.1 & M11.3

ON PCB

YES

CHECK &/OR REPLACE

REPLACE PCB

WIRING OR CONNECTIONS

AND 3 WAY VALVE

IS THE

3 WAY VA LVE

IN DHW

POSITION?

YES

TURN ON HOT

TAP

PUMP

RUNNING

YES

SWITCH ON/OFF

YES

START

SELECTOR TO

DHW POSITION

GREEN LED

ALIGHT

REPLACE CONTROL

BOARD

REPLACE

CONTROL

BOARD

THERE 5 Vdc

BETWEEN TERMINALS

M5.5 & M5.6

ON PCB

CHECK WIRING AND

CONNECTIONS OR

DHW FLOW SWITCH

ON PUMP

CONNECTOR

ON PUMP

YES

MAINS

M15.1 &

M15.2

YES

MAINS

YES

THERE 0 Vdc

BETWEEN TERMINALS

M5.5 & M5.6

ON PCB

YES

THERE 0 - 1 Vdc

BETWEEN TERMINALS

M3.11 & M3.10

ON PCB

FAN RUNNING

MAINS

ON FAN

CONNECTOR

M12.1 &

M12.2

YES

REPLACE FAN

YES

MAINS

ON FAN

CHECK &/OR

REPLACE

WIRING AND

CONNECTIONS

YES

Linea

REPLACE

WIRING OR

CONNECTIONS

REPLACE PUMP

CHECK FLUE GAS TUBE,

DIFFERENTIAL ANALOG

PRESSURE SWITCH AND

WIRING OR

CONNECTIONS

REPLACE

CONTROL

BOARD

CHECK WIRING

AND

CONNECTIONS

BETWEEN TERMINALS

YES

THERE 24 Vdc

BETWEEN TERMINALS

M5.3 ON PCB & WHITE WIRE

ON HIGH LIMIT

THERMOSTAT

YES

THERE 24 Vdc

M5.3 AND M3.3

ON PCB

REPLACE THE

CONTROL BOARD

RESET THE

HIGH LIMIT

THERMOSTAT

GREEN LED

LIGHT

YES

RESTART THE

TEST

THERE 24 Vdc

BETWEEN TERMINALS

M5.3 ON PCB & RED WIRE

ON HIGH LIMIT

THERMOSTAT

YES

THERE 24 Vdc

BETWEEN TERMINALS

M5.3 AND M3.4

ON PCB

CHECK WIRING AND

CONNECTIONS

CHECK WIRING AND

CONNECTIONS,

HIGH LIMIT

THERMOSTAT OR

PCB

YES

THERE 24 Vdc

BETWEEN TERMINALS

M5.3 AND M3.5

ON PCB

CHECK

COMBUSTION AND

CHECK &/OR

REPLACE BURNER

THERMISTOR AND

WIRING

YES

REPLACE THE

CONTROL BOARD

Linea

RED LED

FLASHING

NOYES

SHOWING

FAULT

CODE

YES

5 Vdc

BETWEEN TERMINALS

M2.1 & M2.2 ON DISPLAY

BOARD

5 Vdc

BETWEEN

TERMINALS

M9.1 & M9.2 ON

CONTROL

BOARD

YES

REPLACE DIGITS

BOARD

YES

CHECK AND/OR

REPLACE WIRING

OR CONNECTIONS

WITH DISPLAY BOARD

FAULT

CODE 01

SHOWING

FAULT

CODE 02

SHOWING

REPLACE THE

BICOULORED

LED ASSEMBLY

YES

BICOULORED

LED ASSEMBLY

YES

REPLACE THE DIGITS BOARD

YES

SWITCH ON/OFF

SELECTOR TO

OFF POSITION

SWITCH MODE

SELECTOR TO

DHW POSITION

MAINS

PRESENT BETWEEN

M16.L & M16.N ON

CONTROL

BOARD

RECHECK SUPPLY FUSE

& CONNECTORS TO

BOILER TERMINALS

REPLACE

CONTROL

BOARD

YES

CHECK FUSES

F1 AND F2 ON

CONNECTION

BOARD

FUSE OK

REPLACE FUSE

CHECK WIRING AND

CONNECTIONS ,HIGH

LIMIT THERMOST. AND

CONTROL BOARD

Linea

RESTART THE

HIGH LIMIT STAT

GREEN LED

LIGHT

GREEN LED

LIGHT

YES

RESTART THE

TEST

IGNITION

CONTROL OK

REPLACE

IGNITION

CONTROL

RESTART THE

TEST

YES

REPLACE

CONTROL

BOARD

VOKERA

LINEA PLUS AG

Rev. 1 08/03/2000

TEST B : CHECK CONTROL

IN DHW MODE

START

TURN MODE

SELECTOR SWITCH TO

DHW.

DHW STAT AT MAX.

TURN ON TAP

DOES

BURNER

LIGHT

CHECK BOILER

STARTUP:

TEST A

YES

THERE A

VOLTAGE >4 Vdc

BETWEEN TERMINALS

M3.10 & M3.11

ON PCB

YES

TURN DHW

THERMOSTAT AT

MIN.

FAN

ON?

YES

D.A.P.S.

OK?

YES

CHECK FLUE VENTURI TUBE

CHECK FAN, WIRING

AND CONNECTIONS,

DIFFERENTIAL ANALOG

PRESSURE SWITCH AND

CONTROL BOARD

REPLACE DIFFERENTIAL

ANALOG PRESSURE

SWITCH

BURNER AND FAN

SWITCH OFF

YES

TURN DHW

THERMOSTAT AT

MAX.

WATER FLOW

TEMPERATURE

>40 ûC

YES

REPLACE

CONTROL

BOARD

WAIT WATER

FLOW

TEMPERATURE

>40 ûC

Linea

YES

START

SWITCH ON BOILER

AND SELECT MODE

TO WINTER C/H THERMOSTAT AT

MAX.

MAKE A LINK

BETWEEN PIN M16.TA

AND M16.TA ON

CONTROL BOARD

IS THE

3 WAY VALVE

ON CH

POSITION?

VOKERA

LINEA PLUS AG

Rev. 1 08/03/2000

TEST C: CHECK CONTROL

IN C/H MODE

DOES

BURNER

LIGHT

CHECK BOILER

STARTUP

TEST A

YES

THERE A

VOLTAGE >4 Vdc

BETWEEN TERMINALS

M3.10 & M3.11

ON PCB

YES

TURN CH

THERMOSTAT TO

MIN.

YES

CHECK &/OR

REPLACE 3

WAY VALVE

VENTURI TUBE

PRESENT BETWEEN

M11.1 & M11.2 ON

FAN

ON?

YES

D.A.P.S.

OK?

YES

CHECK FLUE

MAINS

CONTROL

BOARD

CHECK FAN, WIRING

AND CONNECTIONS,

DIFFERENTIAL ANALOG

PRESSURE SWITCH AND

CONTROL BOARD

REPLACE DIFFERENTIAL

ANALOG PRESSURE

SWITCH

REPLACE

CONTROL

BOARD

Linea

BURNER AND FAN

SWITCH OFF

YES

TURN CH

THERMOSTAT AT MAX.

WATER FLOW

TEMPERATURE

>40 ûC

REPLACE

CONTROL

WAIT WATER FLOW

TEMPERATURE

>40 ûC

YES

BOARD

END

REPLACE

IGNITION CONTROL

YES

SPARK AT

ELECTRODE

YES

IGNITION

YES

LOCKOUT

AFTER

IGNITION

YES

CHECK SENSING

ELECTRODE

AND LEAD

SENSING

ELECTRODE

AND LEAD

REPLACE SENSING

ELECTRODE

AND LEAD

REPLACE IGNITION CONTROL

IGNITION

CONTROL

YES

THERE MAIN

BETWEEN TERMINALS

M14.1 & M14.2

ON PCB

THERE 0 Vdc

BETWEEN TERMINALS

M5.3 & M5.4

ON PCB

YES

THERE MAIN

BETWEEN TERMINALS

L & N ON IGNITION

CONTROL

CHECK WIRING

YES

CHECK SPARK

ELECTRODE AND

LEAD OR REPLACE

IGNITION CONTROL

0 VDC

ON BOILER

FLOW

SWITCH

CHECK WIRING

CONNECTIONS

AND

CONNECTIONS

YES

AND

YES

CHECK WIRING

AND

CONNECTIONS

REPLACE GAS VALVE

THERE A

VOLTAGE > 0.5 Vdc

BETWEEN TERMINALS

M3.11 ON PCB & GRAY

WIRE ON D.A .P.

SWITCH

GAS

VALV E

YES

CHECK GAS

CHECK THE FAN,

VENTURI

AND/OR D.A.P.S

THERE A

VOLTAGE > 0.5 Vdc

BETWEEN TERMINALS

M3.11 & M3.10

ON PCB

YES

FLOW

SWITCH

YES

CHECK WATER

Linea

FAULT CODE SHOWING 03

YES

DOES THE

FLOW SWITCH PIN

OPERATE

FAULT CODE SHOWING 04

FAULT CODE SHOWING 06

FAULT CODE SHOWING 07

YES

REPLACE

CONTROL BOARD

YES

CHECK DHW

NTC SENSOR OR

CONNECTION

YES

CHECK FLOW

NTC SENSOR OR

CONNECTION

YES

THE BOILER

FLOW SWITCH

OPERATE

YES

CHECK THE

WIRING AND/OR

THE CONTROL

BOARD

CHECK AND/OR REPLACE THE

DIAPHRAGM.

CHECK THE CORRECT WATER DP

CHECK THE WATER CIRCUIT.

CHECK IF THE PUMP IS ON 3a SPEED

CHECK/ REPLACE THE BOILER FLOW

SWITCH

Linea

FAULT CODE SHOWING 08

REPLACE

CONTROL BOARD

YES

CHECK COMBUSTION

AND BURNER

THERMISTOR OR

CONNECTION

WAIT WATER

FLOW

TEMPERATURE

< 80 ûC

YES

BURNER AND FAN

SWITCH ON

WAIT 3 MIN.

BURNER AND FAN

SWITCH ON

WATER FLOW

TEMPERATURE

>80 ûC

REPLACE

CONTROL

BOARD

REPLACE

CONTROL

BOARD

YES

VOLTAGE < 1 Vdc

BETWEEN TERMINALS

M3.10 & M3.11

TIMER JUMPER

THERE A

ON PCB

YES

REMOVE

JUMPER

RESTART THE

TEST

THERE A

VOLTAGE >4 Vdc

BETWEEN TERMINALS

M3.10 & M3.11

ON PCB

YES

REMOVE THE LINK

BETWEEN PIN M16.TA

AND M16.TA ON

CONTROL BOARD

WAIT 30 SEC.

BURNER,

YES

FAN AND PUMP

SWITCH

OFF

YES

TIMER JUMPER

ON JP9

REMOVE

JUMPER

REPLACE

CONTROL

BOARD

RESTART

THE TEST

CHECK FAN, WIRING

AND CONNECTIONS,

DIFFERENTIAL ANALOG

PRESSURE SWITCH AND

CONTROL BOARD

FAN

ON?

YES

D.A.P.S.

OK?

END

REPLACE DIFFERENTIAL

ANALOG PRESSURE

SWITCH

YES

CHECK FLUE

VENTURI

Linea

SECTION 8 WIRING DIAGRAMS

8.1 EXTERNAL WIRING

The appliance comes with a factory fitted link to allow basic operation of the boiler via the mode selector switch. If external controls are to be added to the system, they must be connected to the appliance as shown in the following diagrams. For advice on controls that are not featured in this book, please contact Vokera technical on 0870 333 0520.

●●

●

Boiler control with room thermostat func-

●●

tion, whereby the RC05 controls the functions of the appliance (Heating & DHW temperature, reset function, fault code display, etc), and also functions as a room thermostat.

●●

Boiler control with programmable room

●

●●

thermostat, whereby the RC05 controls the functions of the appliance (Heating & DHW temperature, reset function, fault code display, etc), and also functions as a programmable room thermostat.

NOTE

If the RC05 is used in the “boiler only” mode, an additional control will be required to switch terminals TA & TA. Full details of the operation of the RC05 and its functions can be found in the installations and users instructions of the RC05.

8.5 VOKERA ROOM THERMOSTAT

Connect the Vokera room thermostat to the appliance as detailed in fig. 45. The Vokera room thermostat can be used with the Vokera time clock or any other voltage-free time clock.

Fig. 44

8.2 TYPICAL CONTROL APPLICATIONS

The appliance can be used with the following controls:

●●

● Vokera mechanical clock (part no. 201).

●●

● Vokera digital clock (part no. 202).

●●

● Vokera room thermostat (part no. 011).

●●

● Vokera RC05 remote control (part no. 405).

●●

● Vokera external sensor (must be used in con-

●●

junction with the RC05). (Part no. 2359259).

●●

● Single-channel, voltage-free time clocks.

●●

● Programmable room thermostats.

●●

In addition, the appliance can be used in conjunction with a typical ‘S’-Plan system, please contact Vokera technical for further detailed instruction.

NOTE

This appliance is not suitable for use with ‘Y’-Plan systems.

8.3 VOKERA TIME CLOCK

See 4.7.4 for detailed instructions on fitting the Vokera time clock.

8.4 VOKERA REMOTE CONTROL

The RC05 remote control must be connected to the appliance as shown in fig. 44. The RC05 can be used in 3-modes:

●●

● Boiler only control, whereby the RC05 con-

●●

trols only the functions of the appliance (Heating & DHW temperature, reset function, fault code display, etc).

Fig. 45

8.6 OTHER CONTROLS

Fig. 46 details typical control applications that are suitable for this appliance. Contact the controls manufacturer and/or Vokera technical department should you require more specific information on the suitability of a particular control.

Further guidance on the recommended practice for the installation of external controls, can be found in CHeSS – HC1/HC2 (www.energyefficiency.gov.uk).

Linea

Appliance wired to basic voltage-free time clock

Appliance wired to basic voltage-free time clock and room thermostat

Fig. 46

Appliance wired to programmable room thermostat

Basic wiring with link between TA & TA (no controls fitted)

Linea

FUNCTIONAL DIAGRAM

CONTROL SWITCHING OF TIME CLOCK AND ROOM THERMOSTAT IS 230 V.a.c.

NOTE: L-N-E CONNECTION IS ADVISABLE

R.T. Room thermostat TS H Heat time switch S.F.S. Domestic hot water flow switch P.S. Pressure switch H.L. Hight limit thermostat S.R. Heat thermistor S.S. Domestic hot water thermistor MOD Modulator F Fan P Pump 3W 3 way motor SP\SE E. Spark\Sense electrode OPE Gas valve solenoids B.C.B. Burner control board B.E.B. Boiler control board S.B. Secondary board JP6 Pre-heating jumper JP8 Natural gas or L.P.G. selector

Linea

JP9 Timer on- off selector JP7 Room thermostat or remote control jumper PT2 Central heating temperature control PT3 Domestic hot water temperature control PT1 (S.B.) Selection of 0-reset / winter - summer DS1÷DS2 Temperature / alarm display TA1 Combustion test F1 Fuse 100 mA F (on 24V circuit) F2 Fuse 2 A F (on 230 V circuit) RL1 Ignition relay RL2 Pump relay RL3 3 way relay IS01 Fan triac L1 Led OK (green) L2 Led alarm (blink red) TRF1 Transformer PAD Differential analogue pressure switch T.B. Burner thermostat

WIRING DIAGRAM

Linea 726

Linea 730

Linea 735

NOTE: L-N-E CONNECTION IS ADVISABLE

CONTROL SWITCHING OF TIME CLOCK AND ROOM THERMOSTAT IS 230 V.a.c.

Linea

SECTION 9 EXPLODED DIAGRAMS

362

212

400

401

226

402

326

POS. DESCRIPTION 726 730 735

1 Frame R01005133 R01005134 R01005212

6 Guard R1913 R1913 R1913 12 Quick primer pressure gauge R1857 R1857 R1857 16 2A fuse R8968 R8968 R8968 17 100 mA fuse R1947 R1947 R1947 18 Cover R10021849 R10021849 R10021849 19 Ignition module R10021848 R10021848 R10021848 20 Printed Circuit Board R10024731 R10024731 R10024731 26 Instrumental panel R10021951 R10022015 R10022029 31 Case R1880 R1922 R2062 38 Printed Circuit Board R10024558 R10024558 R10024558 39 Spring R1862 R1862 R1862 40 Door panel R10024465 R10024465 R1996 43 Push-push cover R1864 R1864 R1864 48 Led Light Guide R1858 R1858 R1858 49 Hole cap R8654 R8654 R8654 50 Pin R1867 R1867 R1867 51 Hole cover R1861 R1861 R1861 52 Selector knob kit R01005072 R01005072 R01005072 53 Control knob kit R01005073 R01005073 R01005073 90 3A fuse R3478 R3478 R3478

212 Screw R5080 R5080 R5080 226 Edge clip R5128 R5128 R5128 326 O ring R1869 R1869 R1869 362 Transformer R10022659 R10022659 R10022659 400 Wiring harness R10021117 R10021117 R10021117 401 Wiring harness R1780 R1780 R1780 402 Wiring harness R1980 R1980 R1980

Linea

351

353

328

351

366

351

328

365

292

201

202

201

248

201

285

202

200

24 Spare

277

353

366

400

401

Linea

POS. DESCRIPTION 726 730 735

1 Domestic water heat exchanger R8037 R1957 R10024627

2 Connection R9807 R9807 R9807

3 Pressure switch R2044 R2044 R2044

4 Non return valve R2908 R2908 R2908

7 By-pass valve R2047 R2047 R1552

9 Heating manifold R10020439 R10020439 R10020439 10 Spring R6862 R6862 R6862

11 Three way valve overhault kit R01005127 R01005127 R01005127 15 Seating plate R7134 R7134 R7134 16 Three way valve cover R2904 R2904 R2904 17 Fixing fork wrench R2906 R2906 R2906 18 O ring connection R6919 R6919 R6919 19 Motorized valve R2905 R2905 R2905 22 Safety valve R1806 R1806 R1806 24 Flow governor R10024462 R8009 R9430 24 Flow governor (spare) R8008 R10020041 R10020041 24 Flow governor (spare) R8009 R10024462 R1321 26 DHW actuator R10022349 R10022349 R10022349 27 Heating cock R1789 R1789 R1789 28 Connection R1790 R1790 R1790 30 Heating cock R10023567 R10023567 R10023567 31 Venting plugs kit R01005137 R01005137 R01005137 34 Heating cock R10023566 R10023566 R10023566 35 Flexible pipe R10023570 R10023570 R10023570 37 Pipe R1631 R1631 R10023211 40 Pipe R10022125 R10022125 R10023210 41 Connection R2903 R2903 R2903 61 Non return valve R10023569 R10023569 R10023569 62 Filling cock R10023568 R10023568 R10023568 64 Pipe R10023643 R10023643 R10023643

200 Washer R5023 R5023 R5023 201 Washer R5026 R5026 R5026 202 Washer R5041 R5041 R5041 248 Washer R5208 R5208 R5208 277 Screw R6903 R6903 R6903 285 NTC sensor R8484 R8484 R8484 292 O ring R7999 R7999 R7999 328 Clip R1890 R1890 R1890 351 Nut R1823 R1823 R1823 353 Nut R1824 R1824 R1824 365 Nipple R1793 R1793 R1793 366 Clip R1820 R1820 R1820 400 Wiring harness R10020530 R10020530 R10020530 401 Wiring harness R1873 R1873 R1873

* R1321 Green flow governor * R8008 Withe flow governor * R8009 Blu flow governor * R9430 Red flow governor * R10020041 Beige flow governor * R10024462 Orange flow governor

Linea

285

200

202

287

201

735

200

288

290

284

200

POS. DESCRIPTION 726 730 735

1 Expansion vessel R2204 R2204 R2573 2 Flexible pipe R2164 R2164 R2164 3 Pump R10020437 R10020437 R10020438 4 Wiring harness R1845 R1845 R1845 5 Automatic air vent bottle R0439 R0439 R0439 6 Pipe R10023195 R10023202 R10023209 7 Pipe R1847 R1847 R2051 8 Heat exchanger R10024578 R10023579 R10024580 9 Pipe R10021041 R10021041 R10020519

10 Pipe R10023198 R10023203 R10023208

11 Bracket R2940 R2940 R2940

28 Pump lock key R9263 R9263 R9263

200 Washer R5023 R5023 R5023 201 Washer R5026 R5026 R5026 202 Washer R5041 R5041 R5041 285 NTC sensor R8484 R8484 R8484 287 Limit thermostat R2258 R2258 R2258 288 O-ring R6898 R6898 R6898 290 Clip R2165 R2165 R2165

Linea

735

332

735

200

351

328

200

POS. DESCRIPTION 726 730 735

1 Air box bottom R10023095 R10022388 R10024792 2 Ambidx air box side R1549 R1549 3 Air box clip R0442 R0442 R0442 4 NG Burner R10024463 R10024524 R10024752 4 LPG burner R10024464 R10024525 R10024753 5 Spark electrode R10022027 R10022027 R10022027 6 Air box side - - R2059 7 Air box side - - R2060

9 NG plate R5172 R5172 10 Gas valve solenoid R10020838 R10020838 R10020838 12 Gas pipe R1839 R1839 R1839 13 Gas valve R10021021 R10021021 R10021021 14 Gas pipe R1840 R1840 R1840 15 Gas cock R1787 R1787 R1787 16 Air box cover R10020216 R10020217 R10020430 17 Wascher R5072 R5072 R5072 18 Glass R3139 R3139 R3139 19 Glass flange R4007 R4007 R4007 21 Washer R5905 R5905 R5905

200 Washer R5023 R5023 R5023 328 Clip R1890 R1890 R1890 332 Thermostat R2600 R2600 R2600 351 Nut R1823 R1823 R1823 400 Wiring harness R10021947 R10021947 R10021947 401 Wiring harness R10024466 R10024466 R10024466

400

401

Linea

295

300

301

212

POS. DESCRIPTION 726 730 735

1 Combustion chamber assembly R6027 R6028 R10024751 2 Combustion chamber back panel R5270 R5316 R10020518 3 Combustion chamber lateral panel R5271 R5271 R5271 4 Combustion chamber front panel R5269 R5315 R10020517

7 Hood assembly R2678 R2860 R1968 10 Fan R2865 R10024526 R10024577 12 Fan to flue connector R10023048 R10023182 R10023183 16 Clamp for tube R5916 R5916 R5916 17 Washer clamp R5917 R5917 R5917 19 Fan flue connection R8083 R8083 R8083 20 Block with combustion analysis check R8085 R8085 R8085 23 Brass cap R8086 R8086 R8086 25 Pressure differential switch R2677 R2677 R2677

212 Self tapping screw R5080 R5080 R5080 295 Silicone tube R1457 R1457 R1457 300 Wiring harness R10021065 R10021108 R10020529 300 Wiring harness R1870 R1870 R1870

Linea

SECTION 10 LPG INSTRUCTIONS

10.1 RELATED DOCUMENTS

BS 6798 INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW

BS 5449 PART 1 FORCED CIRCULATION OF HOT WATER SYSTEMS

BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES

BS 5440 PART 1 FLUES

BS 5482 PART 1 DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS

10.2

Gas Pressures 726 730 735

Inlet pressure (G31) 37 mbar

Burner pressure maximum 36 mbar

Burner pressure minimum 4.0 mbar 3.5 mbar 2.8mbar

Maximum gas rate 2.19 kg/h 2.53 kg/h 2.94 kg/h

Minimum gas rate 0.70 kg/h 0.75 kg/h 0.77 kg/h

Injector size (quantity) 12 x 0.8 mm 14 x 0.8 mm 16 x 0.8 mm

10.3 CONVERTING THE APPLIANCE GAS TYPE

To convert the appliance to another gas type it is necessary to change the burner injectors and adjust the gas pressures. It is also necessary to ensure the jumper tag at JP8 is enabled or disabled according to the gas type used.

●●

● To change the injectors see 6.15

●●

● For correct jumper tag configuration see 7.8

●●

10.4 GAS SUPPLY

The gas supply must be connected to the appliance by a competent LPG installer and must be of sufficient size to supply the appliance at its maximum output. An existing supply must be checked to ensure that it is of adequate size to deal with the maximum rated input of this and any other appliances that it serves.

10.5 GAS SUPPLY INSTALLATION

The entire installation including the meter must be purged and checked for gas soundness.

10.6 CHECKING AND ADJUSTING BURNER PRESSURE (see fig. 16)

Isolate the appliance from the electrical supply and attach a suitable manometer to the gas valve outlet test point.

Compare the reading on the manometer with the value described in 10.2. If adjustment is required, remove the protective cap from the gas valve modulating coil assembly and turn the outer (10mm) nut clockwise to increase, or counterclockwise to decrease the burner pressure.

10.6.2 SETTING THE MIMIMUM BURNER PRESSURE fig. 42

Once the maximum burner pressure has been checked and/or adjusted, remove one of the grey wires from the modulating coil. Compare the reading on the manometer with the value described in 10.2. If adjustment is required, turn the inner (red) crosshead screw clockwise to increase, or counter-clockwise to decrease the burner pressure, whilst ensuring that the outer (10mm) nut does not move. When checking and/or adjustment has been completed, isolate the appliance from the electrical supply, close the DHW outlet, replace the protective cap, refit the grey wire to the modulating coil, remove the manometer, and tighten the outlet test point.

IMPORTANT, A GAS SOUNDNESS CHECK MUST BE CARRIED OUT.

10.6.1 SETTING THE MAXIMUM BURNER PRESSURE fig. 41

Light the boiler as described in 5.7, fully open a DHW outlet (preferably the bath), and ensure the HW temperature selector is set at maximum. Allow the appliance to stabilise.

Linea

Cod. 10024467 - 49/03 - Ed. 3

energizing home heating

Vokèra Ltd.

4th Floor, Catherine House, Boundary Way, Hemel Hempstead, Herts, HP2 7RP

Sales, Technical Advice, General Enquiries - Tel: 0870 333 0520 Fax: 01442 281403

Vokèra Ltd. reserve the right to change the specifications without prior notice. Consumers’ statutory rights are not affected.

Email: enquiries@vokera.co.uk Web: www.vokera.co.uk

After Sales Service - Tel: 0870 333 0220

Vokèra Ireland

West Court, Callan, Co Kilkenny

Tel: 05677 55057 Fax: 05677 55060

A Riello Group Company

COLLECTIVE MARK

“Vokèra”

supports Benchmark

Vokera Linea 726 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual