alpha Evoke 28 User guide

Installation and Servicing

Instructions

Evoke 28 and 33

Wall Mounted, Fan Assisted, Room Sealed,

Gas Fired, High Efficiency Condensing Combination Boiler

For Technical help or for Service call ...

ALPHA HELPLINE Tel: [phone]

website: www.alpha-innovation.co.uk

Nepicar House, London Road,

Wrotham Heath, Sevenoaks,

Kent TN15 7RS

Set for use with Natural Gas

Leave these instructions with the User

These instructions have been carefully prepared but we reserve the right
to alter the specification at any time in the interest of product improvement.
© Alpha Therm Limited 2017.

Part No. 1.040251 rev. ST.003028.000

0317/D373

BENCHMARK SCHEME

To comply with Building Regulations Part L1 (Part 6 in Scotland) the boiler should be installed in accordance with the
manufacturer’s instructions. Self-certification that the boiler has been installed to comply with Building Regulations can be
demonstrated by completing and signing the Benchmark Checklist at the back of these instructions

Code of Practice

For the installation, commissioning and servicing of domestic heating and hot water products.

Benchmark places responsibilities on both manufacturers and installers*. The purpose is to ensure that customers** are
provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with
the manufacturer's instructions by competent persons and that it meets the requirements of the appropriate Building
Regulations. Installers are required to carry out work in accordance with the following:

Standards of Work

• Be competent and qualified to undertake the work required.

• Install, commission, service and use products in accordance with the manufacturer's instructions provided.

• Ensure that where there is responsibility for design work, the installation is correctly sized and fit for purpose.

• Meet the requirements of the appropriate Building Regulations. Where this involves notifiable work be a member of a

Competent Persons Scheme or confirm that the customer has notified Local Authority Control (LABC), prior to work
commencing.

• Complete all relevant sections of the Benchmark Checklist/Service Record when carrying out commissioning or
servicing of a product or system.

• Ensure that the product or system is left in a safe condition and, where possible, in good working order.

• Highlight to the customer any remedial or improvement work identified during the course of commissioning or servicing work.

• Refer to the manufacturer's helpline where assistance is needed.

• Report product faults and concerns to the manufacturer in a timely manner.

Customer Service

• Show the customer any identity card that is relevant to the work being carried out prior to commencement or on request.

• Give a full and clear explanation/demonstration of the product or system and its operation to the customer.

• Hand over the manufacturer's instructions, including the Benchmark Checklist, to the customer on completion of an installation.

• Obtain the customer's signature on the Benchmark Checklist to confirm satisfactory demonstration and receipt of

manufacturer's instructions.

• Advise the customer that regular product servicing is needed, in line with manufacturers' recommendations, to ensure
that safety and efficiency is maintained.

• Respond promptly to calls from a customer following completion of their work, providing advice and assistance by
phone and, if necessary, visiting the customer.

• Rectify any installation problems at no cost to the customer during the installer's guarantee period.

* The use of the word "installer" is not limited to installation itself and covers those carrying out installation, commissioning and/or servicing of heating and hot water

products, or the use of supporting products (such as water treatment or test equipment).

** Customer includes householders, landlords and tenants.

Benchmark Commissioning and Servicing Section

It is a requirement that the boiler is installed and commissioned to the manufacturers instructions and
the data fields on the commissioning checklist completed in full.

To instigate the boiler guarantee the boiler needs to be registered with the manufacturer within one
month of the installation.

To maintain the boiler guarantee it is essential that the boiler is serviced annually by a Gas Safe
registered engineer who has been trained on the boiler installed. The service details should be
recorded on the Benchmark Service Interval Record and left with the householder.

www.centralheating.co.uk

Useful contact details: Gas Safe Register - 0800 408 5577 - www.gassaferegister.co.uk

Alpha Heating Innovation: General Sales Enquiries - 0844 871 8760

Technical Helpline - 0844 871 8764

Alpha Evoke 28 and 33 - Benchmark Scheme

2

CONTENTS

1 Introduction ........................................ 3

2 Technical data ...................................4

3 General boiler information ................. 9

4 Installation .........................................16

5 Commissioning .................................. 25

6 Routine servicing ............................... 34

8 Wiring diagram ..................................45

9 Error codes and fault finding..............46

10 Short parts list ...................................49

11 Energy classification .......................... 50

Benchmark Checklist ......................... 56

Service Record .................................. 57

7 Component replacement ...................40

1 INTRODUCTION

The Evoke 28 and 33 are wall mounted, room sealed, fan assisted, high efficiency, condensing boilers. The burner is lit
electronically and the heat output is controlled by a modulating fan and gas valve.

The Evoke 28 and 33 are combination boilers providing both central heating and domestic hot water at mains pressure.

The boiler is supplied with a pump, pressure relief valve, expansion vessel and pressure gauge fully assembled and tested. It
is designed for use with a fully pumped, sealed and pressurised central heating system.

IMPORTANT

Failure to install and commission this appliance in compliance with the manufacturer's instructions may invalidate the warranty.

It is the law that all gas appliances are installed by a competent person, ie Gas Safe registered personnel, in accordance
with the following recommendations:-

Current Gas Safety (Installation and Use) Regulations
All current Building Regulations issued by the Department of the Environment, i.e. Approved Document L26.
Building Standards (Scotland) (Consolidation) Regulations issued by the Scottish Development Department
UK Water Regulations/Byelaws (Scotland)
Health & Safety Document No. 635 (The Electricity At Work Regulations 1989)
The installation should also be in accordance with the following British Standard Codes of Practice:-

BS 5440-1: 2008 ........................Flueing and Ventilation Requirements

BS 5440-2: 2009 ........................Installation and Maintenance of Flues and Ventilation

BS 5546: 2010 ...........................Specification for Water Heating Appliances

BS 6798: 2009 ...........................Specification for Installation gas fired boilers up to 70 kW

BS 6891: 2005 + A2: 2008 .........Installation of low pressure Gas Pipework

IGEM/UP/2 ...............................Installation of pipework

IGEM/UP/4 ................................Commissioning of gas fired plant

IGE/UP/10 .................................Installation of Flued gas appliances

IGEM/UP/16 ..............................Design for natural gas installations

IGE/UP/1 and 1B .......................Strength Testing and tightness testing Natural Gas Installations

Reference should also be made to any other standards and requirements relating to the installation depending on the location
and use.
Reference should be made to DEFRA document 'Guide to condensing boiler installation assessment procedures for dwellings'.

If installation is in a timber framed building, refer to the Institute of Gas Engineers document IGE/UP/7.
This appliance meets the requirements of IPX5D, ie degree of protection against moisture.
This appliance contains no asbestos and no substances have been used in the construction process that contravene the

COSHH Regulations (Control of Substances Hazardous to Health).
Failure to install this appliance correctly could lead to prosecution. It is in your own interest and that of safety to ensure that

the law is complied with.
Manufacturer's instructions must NOT be taken in anyway as over-riding statutory obligations.
Notes: 1. Ensure that the Benchmark Checklist has been completed after the boiler has been installed and commissioned.

2. It is the law that all domestic boiler installations are registered by the installer through the Gas Safe Notification
Scheme.

3. The boiler must only be used with Alpha CD condensing flue components.

Propane Gas (LPG) - In addition to the regulations and requirements stated, the boiler must be installed in accordance with
BS 5482:1 - The Installation of Propane Burning Appliances in Permanent Dwellings.

Alpha Evoke 28 and 33 - Contents/Introduction

3

2 TECHNICAL DATA

2.1 TECHNICAL PERFORMANCE DATA - NATURAL GAS (Cat I2H 2H - G20 20 mbar)

Heat input gross - DHW kW

Heat input gross - CH kW

Heat input net - DHW kW

Heat input net - CH kW

Heat output condensing (50/30°C) - CH kW

Heat output non condensing (80/60°C) CH kW

Heat output min. - CH kW

Heat output nominal - DHW kW

Gas rate at max. output m³/h

Gas supply pressure mbar

Max. CH temperature - Set point °C

Gas burner injector diameter mm

DHW flow rate at 35°C rise l/min

DHW flow rate at 30°C rise - EN13203-1 l/min

Dry NOx weight mg/kWh

Dry NOx ppm

NOx Class

Factory set CO

CO

at maximum CH output %

2

CO

at maximum DHW output %

2

CO

at minimum output %

2

2

CO (max) ppm

Maximum CO/CO

Ratio

2

SAP/SEDBUK seasonality efficiency 2005 %

SAP/SEDBUK seasonality efficiency 2009 %

ErP DHW efficiency %

ErP Seasonal space heating efficiency %

Max. primary system pressure bar

Min. primary system pressure bar

Recommended system pressure - Cold bar

System pressure relief valve setting bar

Expansion vessel size litres

Expansion vessel charge pressure bar

Electrical power consumption - Max. Watts

Electrical power consumption - Standby Watts

Evoke 28

32.0

27.3

28.8

24.6

26.1

24.1

4.3

28.3

3.05

20

85

5.00

12.1

14.1

35

20

6

9.7

9.7 (+0.5/-0.2%)

8.8 (+0.2/-0.3%)

450

0.004

90.1

88.9

87 (XL)

93

2.5

0.5

1.0

3.0

8.0

1.0

80

2

Evoke 33

36.2

31.7

32.6

28.6

29.7

28

4.9

32

3.45

20

85

6.00

14.1

16.5

30

17

6

9.5

9.5 (±0.2%)

8.6 (+0.2/-0.3%)

450

0.004

90.2

89.0

87 (XL)

93

2.5

0.5

1.0

3.0

8.0

1.0

105

2

2.1 TECHNICAL PERFORMANCE DATA - LPG - PROPANE GAS (Cat I3P 3P - G31 37 mbar)

Evoke 28 Evoke 33

Heat input gross - DHW kW

Heat input gross - CH kW

Gas supply pressure mbar

Gas burner injector mm

CO

at maximum CH output

2

CO

at maximum DHW output

2

CO

at minimum output

2

Gas rate at maximum output kg/h

Note: OtherTechnical data is the same as NG data.

Alpha Evoke 28 and 33 - Technical Data

4

31.3

26.7

37

3.80

11.4

11.4 (±0.3)

10.6 (±0.2)

2.24

35.4

31.1

37

4.30

11.2

11.2 (+0.2/-0.4)

10.0 (+0.4/-0.2)

2.53

2.2 PHYSICAL DATA

Boiler flow and return connections mm

DHW inlet (cold) DHW outlet (hot) connections mm

Gas connection diameter mm

Boiler dimensions Height mm

Width mm

Depth mm

Clearances for servicing Bottom mm

Bottom (with jig) mm

Top (horizontal flue) mm

Top (vertical flue) mm

Sides mm

Front mm

Recommended hole size for flue pipe mm

Recommended hole size for instalation from inside the building mm

Boiler dry lift weight Evoke 28 kg

Evoke 33 kg

Boiler operating weight (full of water) approx. Evoke 26 kg

Evoke 33 kg

Max. total flue length Horizontal m

Max. total flue length Vertical m

Flue system diameter mm

22

15

22

712

440

256

150

250

235

150

5

450

110

130

33.6

35.5

35.8

37.9

12

14

60/100

2.3 FLUE LENGTHS

A 500 mm or 1000 mm Easy-Flue terminal kit with 90° bend or horizontal terminal is available.

CD 750 mm and 1000 mm flue extensions are available.

Length of Flue Required:-

Rear Flue = wall thickness + 180 mm (includes terminal).

Side Flue = wall thickness + distance between wall and side of boiler + 265 mm (includes terminal).

Vertical Flue = distance from top of boiler side panel to required roof position minus 1000 mm for vertical terminal assembly.

Maximum horizontal flue length = 12 m.

Maximum vertical flue length including terminal is 14 m.

Each additional CD 90° Bend is equivalent to 1.3 m of flue length.

Each CD 45° Bend is equivalent to 0.9 m of flue length.

The CD Vertical Flue terminal assembly is equivalent to 1 m of flue length.

2.4 PUMP

The boiler is equipped with a variable speed low power consumption pump.

During the DHW mode, the pump always runs at the maximum speed.
During the CH mode, three different functioning modes of the pump are available, Proportional, Fixed and Constant )T.

Proportional - The pump speed is controlled automatically in order to give a proportional pump head, the pump speed

varies based on the heat output supplied by the burner - the greater the heat output the higher the pump
speed. See parameter A3 in Section 5.13.

It is possible to adjust the pump speed range in the boiler parameter menu.

Fixed - The pump runs at a constant speed by setting the same minimum and maximum speeds. See parameters

A1 and A2 in Section 5.13.

Constant - The pump speed is controlled to give a set )T. See parameter A3 in Section 5.13.
The boiler is factory set to Constant - to achieve a )T of 15°C (parameter A3 is set to 15)

By-pass Regulation - The boiler leaves the factory with the by-pass open.
If necessary, the by-pass can be adjusted to the system requirements from maximum (by-pass open) to minimum (by-pass

closed). Adjust using a flat head screwdriver, turn anticlockwise to close the by-pass, and clockwise to open.
With the by-pass in the closed position the system must have a continuous open circuit.

If zone valves are used in the system an external by-pass must be fitted.

Alpha Evoke 28 and 33 - Technical Data

5

2.4.1 Evoke 28 Available Pump Head and Power Consumption

7

6

Speed 9

5

A

4

3

Head (m water)

2

1

0

200 600 1000 1400800 1200 16004000

A+B = Head available with by-pass closed
B = Head available with by-pass open
C+D = Power consumed by the pump with by-pass open (dotted area)
D = Power consumed by the pump with by-pass closed (dotted area)

C

Speed 9

Speed 6

Flow rate (l/h)

70

60

50

40

D

30

20

B

Pump electrical consumption (W)

10

0

Fig. 2.1

2.4.2 Evoke 33 Available Pump Head and Power Consumption

7

6

5

4

3

Head (m water)

2

1

0

200 600 1000 1400800 1200 16004000

A+B = Head available with by-pass closed
B = Head available with by-pass open
C+D = Power consumed by the pump with by-pass open (dotted area)
D = Power consumed by the pump with by-pass closed (dotted area)

Speed 9

C

Speed 9

D

Speed 5

Flow rate (l/h)

70

60

50

40

30

20

B

Pump electrical consumption (W)

10

0

Alpha Evoke 28 and 33 - Technical Data

6

Fig. 2.2

2.5 ELECTRICAL CONNECTIONS

Note: This Appliance Must Be Earthed

Optional integral single channel controls are available if required.

Note: Only use the Alpha single channel controls. Do not fit any two channel controls.

Programmer clock

(optional)

R

3

connect clock

Remove link to

Bl

Br

G/Y

N

L

Br

Bl G/Y

Mains Supply
220 V ~ 50 Hz

Remove link to

connect 220 V

room thermostat

When an Alpha Climatic control is connected to terminals 41 and 44

4

Bk

Bk
Bl

A

B

remove the links between terminal blocks 1 and 2

1

Bl

2

R

Br

R

Bl

Y

Br

1

256 39 38 48

Bk

R

For testing

R

only

Room

thermostat

(optional)

Climatic Control

J2 on PCB

Or

R

Bk Or Y

40

41

44

Alpha

(optional)

38

B4

J2 on PCB

Y

J1 on PCB

B9

X4 on PCB

B4 External sensor
B9 DHW inlet sensor

Colour Code

Bk Black
Bl Blue
Br Brown

G Green
Gy Grey
G/Y Green/Yellow

Or Orange
P Purple
R Red

W White
YYellow

Fig. 2.3

2.6 DATA BADGE ANNOTATION

NOTE: Technical data is provided on the boiler data label and in Section 2.1.

Md

o

Sr N
Type
Q

nw/Qn min.

PMS
NO

x Class

nw/Qn max.

Q
PMW

P
D

Md.............................Model

Cod. Md ....................Model code

o

Sr N

.........................Serial number

CHK ..........................Check

Cod. PIN ...................PIN code

Type ..........................Type of installation (ref. CEN TR 1749)

Q

nw min. .....................DHW minimum heat input

Q

n min. .......................CH minimum heat input

Q

nw max. ....................DHW maximum heat input

Q

n max. ......................CH maximum heat input

n min.

Cod. Md
Cod. PIN

n max.

P
TM

n min. .......................Minimum heat output

P
P

n max. .......................Maximum heat output

PMS ..........................Maximum system pressure

PMW .........................Maximum DHW pressure

D ...............................Specific flow rate

TM ............................Maximum operating

temperature
NO

x Class .................NOx Class

CONDENSING .........Condensing boiler

CONDENSING

Alpha Evoke 28 and 33 - Technical Data

7

2.7 BOILER SCHEMATIC

16

15

14

13

12

11

10

17

18

19

20

21

22

23

9

24

8

7

6

5

25

26

27

4

3

2

1

Domestic

hot water

outlet

Gas

1 Gas isolation valve

2 Cold mains isolation valve

3 Gas valve

4 DHW flow switch

5 Gas injector

6 Flow regulator

7 DHW temperature sensor

8 Condensate trap

9 3 bar safety valve

10 Expansion vessel

11 Venturi positive pressure point (+)

Cold mains

water inlet

Condensate discharge

and expansion relief

12 Venturi

13 Primary flow temperature sensor

14 Ignition/sensing electrode

15 Air supply pipe

16 Flue temperature sensor

17 Flue test point (pressure point +)

18 Air test point (pressure point -)

19 Burner

20 Primary return sensor

21 Fan

22 Automatic air vent

Primary
Heating

return

28

29

30

31

Primary

Heating flow

23 Boiler pump

24 Primary pressure switch

25 DHW heat exchanger

26 Diverter valve

27 By-pass

28 Drain point

29 Safety valve indicator

30 Heating return isolation valve

31 Heating flow isolation valve

Alpha Evoke 28 and 33 - Technical Data

8

Fig. 2.4

3 GENERAL BOILER INFORMATION

3.1 GAS SUPPLY

The meter and supply pipes must be capable of delivering the required quantity of gas in addition to the demand from any
other appliances connected to the same gas supply.

Refer to Technical performance data in Section 2.1 and 2.2.
The complete installation, including the meter, must be tested for gas tightness and purged as described in BS 6891.

3.2 ELECTRICAL SUPPLY

The boiler requires a 230/240 V ~ 50 Hz mains supply, fused at 3 A

The boiler must be earthed.

There must only be one common isolator, providing complete electrical isolation, for the boiler and any external controls.

This boiler has been fitted with a supply cable, however, if it is necessary to fit a cable use PVC insulated cable not less than

0.75 mm² (24 x 0.2 mm) to BS 6500 Table 16. The boiler should be connected to a fused three pin plug and unswitched shuttered
socket outlet (both complying with BS 1363), or a fused double pole switch with a contact separation of at least 3 mm in both poles.

Wiring external to the boiler must be in accordance with the current IEE Wiring Regulations (BS 7671).

Note: If a room thermostat is fitted, it must be suitable for 230/240 V switching.

3.3 AIR SUPPLY

The boiler does not require any air vents for cooling in the room in which it is installed or when installed in a cupboard or
compartment. The minimum clearances for servicing must always be maintained.

Note: A cupboard or compartment used to enclose the boiler must be designed and constructed specifically for the purpose,
i.e. comply with the Building Regulations.

3.4 FLUE SYSTEM - Fig. 3

The flue system must be installed in accordance with BS 5440:1.

When using a horizontal flue kit ensure that the flue outer duct is installed horizontally (please note that the flue inner duct
already has a pre-determined slope towards the boiler for condensate to run back towards the boiler).

When additional flue extensions are used, ensure the flue slopes downwards towards the boiler by a minimum of 25 - 30 mm
per metre of flue.

Horizontal and vertical flue assemblies should be supported every metre with access provided to the joints.

Additional flue components are available as follows:-

CD EasyFlue 500 mm telescopic terminal - Part No. 6.12000510.

CD EasyFlue 1000 mm telescopic terminal - Part No. 6.12001010.

CD 750 mm flue extension - Part No. 6.2000750.

CD 1000 mm flue extension - Part No. 6.2001050.

CD 100 mm flue support brackets (pack of 5) - Part No. 6.1000355.

CD 90° bend - Part No. 6.2000590.

CD 45° bend - Part No. 6.2000545.

CD Vertical flue terminal kit - Part No. 6.2000520. Refer to the separate installation instructions supplied with the kit.

Flue support brackets - Part No. 6.1000355.

Terminal guard - Part No. 6.2000570.

Additional flue accessories and plume management are also available.

Note: 1. If an extra 90° bend is used, this reduces the maximum flue length by 1.3 m. Each 45° bend used reduces the

maximum flue length by 0.9 m.

2. Under no circumstances must the flue length (including allowances for extra bends) exceed 12 metres horizontally

and only 14 metres vertically.

3. Failure to use Alpha flue components with the boiler will invalidate the boilers CE approval, guarantee and may be

unsafe.

Alpha Evoke 28 and 33 - General Boiler Information

9

12 m

B

A

A

B

A

HORIZONTAL FLUE OPTIONS - Lmax - 12 metres

Not less than

300 mm

H

L = A + B = 12m max.

L = A + B + (90° bend = 1.3 metre)

VERTICAL FLUE OPTIONS

L = A + (2 x 45° bends = 1.8 metre)

Fig. 3.1

Not less than

300 mm

H

Hmax = 14 m Hmax = 12.2 m (14 m - 1.8 m)

Fig. 3.2

Alpha Evoke 28 and 33 - General Boiler Information

10

3.5 FLUE TERMINAL LOCATION - Figs. 3.3 and 3.4

J

D

G

HI

Q

Boundary

O

P

N

A Directly below an opening, air brick, windows, etc.

B Below gutters, soil pipes or drain pipes

C Below eaves

D Below balconies

E From a vertical drain pipe or soil pipe

F From an internal or external corner

G Above ground, roof or balcony level

H From a surface or boundary facing the terminal

I From a terminal facing the terminal

J Above an opening, air brick, window etc.

K Vertically from a terminal on the same wall

L Horizontally from a terminal on the same wall

M Horizontally from an opening, air brick, window etc.

N Minimum protrusion through a roof

O From a vertical obstruction

P From an openable window

Q From an adjacent vertical terminal

Min. distance (mm)Terminal position

(See Note 1)

300

75 (See Note 3)

200 (See Note 3)

200 (See Note 3)

150 (See Note 3)

300 (See Note 2)

300 (See Note 9)

600 (See Note 4)

1200 mm

300

(See Note 1)

1500 mm

300 mm

300 mm

(See Note 1)

300 mm

300 mm

600 mm

600 mm

Fig. 3.3

Notes:

1. In addition, the terminal should not be nearer than 150 mm to the framework of an opening into the building, i.e. a

window surround or door surround.

2. This clearance may be reduced to 25 mm without effecting the performance of the boiler. However, to ensure the

condensate plume does not affect adjacent surfaces a clearance of 300 mm is preferable.

3. These clearances may be reduced to 25 mm without effecting the performance of the boiler. However, to ensure the

condensate plume does not affect adjacent surfaces the terminal can be extended beyond gutters, pipes, eaves,
balconies etc. by upto 500 mm. If the flue is extended more than 500 mm outside, it should be boxed and insulated.

4. To reduce the possibility of nuisance to neighbouring buildings etc. it is recommended the terminal should not be less

than 2500 mm from car parking spaces, building boundary walls, fences etc.

5. A terminal must not be sited under a car port roof.

6. In certain weather conditions the terminal will emit a plume of steam. If possible avoid positioning the terminal where

this may cause a nuisance, i.e. positions A, D, G, H, J or M.

7. The flue terminal must be exposed to the external air and the position must allow the free passage of air across it at all times.

8. The flue terminal must be positioned where products of combustion will freely disperse and not cause a nuisance.

9. Where a terminal is sited below 2 m from the ground or floor level, the terminal must be protected by a terminal guard.

In these situations, consideration should also be given to prevent nuisance plume and fumes in areas such as access
routes, passageways, patios, balconies etc.

Alpha Evoke 28 and 33 - General Boiler Information

11

Proximity of flue duct outlets to boundaries

The flue duct shall be sited so that it is at least 600 mm (see Fig. 3.4) from the boundary line when facing it and at least 300
mm from the boundary line when running parallel to it.

Boundary

Building

Terminal facing the boundary

Boundary

Building

Terminal at an angle to the boundary

Terminal

300 mm

600 mm

600 mm

Terminal

Fig. 3.4

Boundary

Building

Terminal parallel to the boundary

Adjacent building

Boundary

Building

Terminal facing an opening
in adjacent building

Terminal

300 mm

Terminal

Window

2000 mm

3.6 BOILER LOCATION

The boiler is not suitable for external installation unless it is installed within a purpose designed weatherproof building.
The boiler must be installed on a flat vertical wall which is capable of supporting the weight of the boiler. The boiler can be fitted

to or adjacent to a wall comprising of a combustible material without the need for a special thermal insulation barrier.
If the boiler is to be fitted in a timber framed building, it should be fitted in accordance with the Institute of Gas Engineers

'Guide for Gas Installations in Timber Frame Housing', reference IGE/UP/7.

The boiler may be installed in any room or internal space, although particular attention is drawn to the requirements of the
current IEE Wiring (BS 7671) Regulations, and in Scotland, the electrical provisions of the Building Regulations applicable in
Scotland, with respect to the installation of the boiler in a room or internal space containing a bath or shower. Where a room­sealed boiler is installed in a room containing a bath or shower, it must not be possible for a person using the bath or shower
to touch any electrical switch or boiler control utilising mains electricity.

The boiler may be installed in a cupboard or compartment, provided it is correctly designed for that purpose, i.e. complies
with the Building Regulations and the requirements of BS 6798.

Alpha Evoke 28 and 33 - General Boiler Information

12

3.7 CENTRAL HEATING SYSTEM - Fig. 3.5

The boiler is designed for use in a sealed central heating system in accordance with the requirements of BS EN 12828 and BS 6798.

The system should be designed to operate with flow temperatures of up to 90°C. When designing the system, the pump
head, expansion vessel size, mean radiator temperature, etc. must all be taken into account. Refer to the pump performance
table for guidelines.

System volume - The expansion vessel incorporated into the boiler is suitable for a sealed heating system with a maximum
water content of 80 litres (18 gal). Above 80 litres, consideration should be given to fitting an additional expansion vessel
fitted in the position shown in Fig. 32.5. To check correct operation of the expansion vessel(s) the system pressure should not
be more than 2.5 bar when the system is at maximum operating temperature (for further guidance refer to BS 7074:1).

The boiler is supplied with the following components built in:-

Pressure gauge - To indicate the system pressure to be maintained.

Expansion vessel - Conforming to EN 13831 with a capacity of 8 litres and pre-charged with air to a pressure of 1.0 bar.

By-pass - The boiler incorporates an automatic by-pass, therefore an automatic by-pass is not required for the system.

Static head of system

Note: A drain tap should be installed at the lowest point
of the heating circuit and beneath the appliance.

Boiler

casing

Heating

flow

Heating return

System
drain tap

Automatic
air vent

Note: If the mains is fitted with
a water meter, check valves or
loose jumper stop cock, then
a DHW expansion device must

Additional expansion
vessel (if required)

Filling point

DHW outlet

Mains water inlet

be fitted.

Fig. 3.5

3.8 FILLING THE CENTRAL HEATING SYSTEM - Fig. 3.6

The system design pressure (cold) should be set to 1.0 bar. This pressure is equivalent to a static head (see Fig. 3.5) of 10.2
metres of water.

Provision must be made for filling the system. This is done by the use of a filling loop. See Fig. 3.6. A filling loop is not
supplied with this boiler.

Filling of the system must be carried out in a manner approved by the local Water Undertaking. Where allowed, the system
may be filled via a temporary connection as shown in Fig. 3.6. After filling, always disconnect the flexible hose of the filling
loop.

All fittings used in the system must be able to withstand pressures up to 3 bar.

Drain taps (to BS 2879) must be used to allow the system to be completely drained.

Heating circuit

return

Stop
valve

temporarily connected

Fig. 3.6

Hose

unions

Filling loop

Double check

valve assembly

Test cock

Stop
valve

Mains
water
supply

Alpha Evoke 28 and 33 - General Boiler Information

13

3.9 FLUSHING THE HEATING SYSTEM

It is essential that the central heating system is thoroughly cleaned and flushed when fitting an Alpha boiler. Failure to do so
will invalidate the warranty.

The primary condensing heat exchanger is constructed in stainless steel and therefore is compatible with most materials
used in a heating system.

Cleaning agents and inhibitors must be applied in accordance with their manufacturers instructions. Suitably approved
products for cleaning and treatment must be used.

The system should be flushed in accordance with BS 7593 and BS EN 14336. The following procedures are recommended:

1. Installing onto a new system:­ a. Fill the system, vent at high points and radiators.
b. Check for leaks.
c. Drain the system.
d. Chemically clean the system as instructed by the recommended cleaner manufacturer.
Note: Ensure that the system is flushed to remove any remains of the cleaner.
e. If chemical cleaner is not used to clean the system:­ i) Refill the system.
ii) Switch on the boiler and allow the system to heat up to the normal operating temperature.
iii) Switch off the boiler and drain the system while the water is still hot.
iv) Refill the system and check for leaks.
f. Add the inhibitor to the system as instructed by the inhibitor manufacturer instructions.

2. Installing onto an existing system, clean the system before fitting the new boiler:­ a. If the old boiler is still working:­ i) Switch on the boiler and allow the system to heat up to the normal operating temperature.
ii) Switch off the boiler and drain the system while the water is still hot.
iii) Refill and chemically clean the system as instructed by the cleaner manufacturer instructions.
iv) Ensure the system is flushed to remove any remains of the cleaner.
v) Fit the new boiler.
b. If the old boiler is not working:­ i) Drain the system.
ii) Remove the old boiler.
iii) Flush the system through.
iv) Fit the new boiler.
v) Refill and chemically clean the system as instructed by the cleaner manufacturer instructions.
vi) Ensure the system is flushed to remove any remains of the cleaner and check for leaks.
c. Add the inhibitor to the system as instructed by the inhibitor manufacturer instructions.

The system inhibitor level must be maintained at the correct concentration. The PH of the system water must be between 7.5
and 9.5 or the appliance guarantee will be invalidated.

The system must not be filled with softened water.

3.10 DISPOSAL OF CONDENSATE

Provision must be made for the safe disposal of condensate produced by the flue gases of the Alpha boilers and reference
should be made to BS 6798 for the requirements on the disposal of condensate.

The boilers incorporate a condensate trap which has a seal of greater than 75 mm, therefore no additional trap is required.

The condensate should ideally be discharged internally into an internal waste pipe (washing machine/sink waste) or soil pipe
to avoid the possible risk of freezing. The pipework must be in 22 mm pipe (minimum).

External pipe runs should be avoided, but if it is necessary, the pipework should be protected from the risk of freezing with
waterproof insulation and the length should be kept to a maximum of 3 m and the condensate pipework should be increased
to a minimum of 32 mm diameter. Termination should be into an external gulley or soakaway as shown in Figs. 3.7 and 3.8.

Note: All pipework must have a continuous fall (see Figs. 3.7 and 3.8) from the boiler and must be of an acid resistant
material such as plastic waste pipe. (copper or steel is not suitable).

The condensate pipe is combined with the expansion relief discharge. The flexible condensate hose supplied meets the
requirements for use with both condensate and expansion relief. This should be connected to a suitable waste pipe and
fittings with approval for hot and cold water, i.e. BS EN1451-1PP Waste piping, BS EN1455-1 ABS piping or BS EN 1566-1
MUPVC piping.

The condensate and discharge should be connected to a drain for sewage and foul waste or a dedicated soak away with
neutraliser added.

It should be noted that the connection of a condensate pipe to a drain may be subject to local building control requirements.

Alpha Evoke 28 and 33 - General Boiler Information

14

Plastic pipe
(minimum 32 mm)

22mm termination from boiler, increase to 32 mm if external

Minimum gradient 2½°

Fig. 3.7 - External gully

Cement mortar sealing

500 mm min.

Use waterproof
pipework insulation
in very exposed
positions

Ensure pipe is
adequately supported

Open end of pipe
diverted into gully
below grid but above
water level

O

2½ fall

Ground level (either/or)

25mm

100mm plastic tube

Bottom of tube sealed

Soakaway depth 400mm
filled with limestone chippings

300mm

Two rows of 3 x 12mm
holes at 25mm centres,
50mm from the bottom
of the tube. Holes to face
away from house.

Fig. 3.8 - External soakaway

3.11 DOMESTIC HOT WATER SYSTEM

The minimum flow rate needed for the flow switch and burner to operate is 1.5 litres/min.

If the incoming mains water pressure is above 5 bar a pressure reducing valve must be fitted.

If the mains supply is fitted with a water meter, check valves or loose jumper stop cock, then a DHW expansion device must
be fitted.

Following Part L Building Regulations, where the mains water hardness exceeds 200 parts per million, provision should be
made to treat the feed water to the hot water circuit of combination boilers to reduce the rate of accumulation of limescale.

To ensure economic use, the pipe runs between the boiler and taps should be in 15 mm copper pipe and be as short as
possible. Where possible the pipework should be insulated to reduce heat loss.

All taps and mixing valves used with the hot water system must be suitable for operating at a mains pressure of up to 8 bar.

Showers - A shower may be used with the boiler if required.
If a loose or flexible head type shower is used it may require the fitting of a double check valve, to comply with Water Bye Law 17.

Bidets - No anti-syphonage arrangements are necessary, provided the outlets are shrouded and it is not possible to attach
a temporary hand held spray. A supply of direct mains fed hot and cold water is permitted provided the appliance is of the
over-rim flushing type.

Before the mains water supply pipe is connected to the boiler, it should be thoroughly flushed out to avoid the danger of dirt
or foreign matter entering the boiler.

Alpha Evoke 28 and 33 - General Boiler Information

15

4 INSTALLATION

256 mm

5 mm

5 mm

150 mm

235 mm - Can be reduced to
150 mm when using a
vertical flue

440 mm

4.1 UNPACKING

1. The boiler carton also contains the following:-

Connection kit (union bends, washers and valves)

Mounting bracket plus screws and wall plugs

Condensate discharge pipe

Literature pack and Wall template

A suitable Alpha flue system must be selected to use with the boiler.

Notes: a. All flues must be suitable for Alpha condensing boilers.
b. CD 750 mm and 1000 mm flue extensions are available, if required.

2. Unpack boiler and remove the loose items, packs and mounting bracket.

Note: The boiler can be stood in an upright position (only while the valves and union bends are not fitted).

It is recommended that two persons lift the boiler.

4.2 CLEARANCES REQUIRED - Fig. 4.1

712 mm

Minimum
clearance
of 450 mm
from front
of boiler

Minimum clearances

Fig. 4.1

4.3 PREPARE THE WALL - Fig. 4.2

1. Decide upon the position of the boiler taking into account the
clearances required for servicing and the flue terminal position.

2. Tape the template to the wall (ensure it is level and the right
way up) and mark the position of the holes for the boiler
mounting bracket. If rear exit flue is used, mark the position of
the hole for the flue.

3. Side exit flue - Continue the horizontal centre line of the flue
across the wall to the side wall, then along the side wall 135 mm
(ensure the lines are horizontal). This will give the position of the
centre of the hole for the flue.

4. Cut the 110 mm diameter hole (or use a 107 mm core drill) in
the wall for the flue.

Notes: 1. Ensure the hole is horizontal.

2. For internal fitting of the flue, using the flue sealing

collar supplied, cut a 130 mm dia. flue hole using a
127 mm core drill.

5. Drill the fixing holes (10 mm dia.) to accept the No.10 plugs
supplied. Using the screws supplied, fit the mounting bracket.

Rear exit hole
110 mm dia.

=

=

Ensure line is level

143 mm

Fixing holes
if mounting
bracket used

Fixing holes
if wall jig used

Outline of
boiler

Template

Fig. 4.2

135 mm

Position of
110 mm hole
to be cut for
side exit flue

Alpha Evoke 28 and 33 - Installation

16

4.4 FIT THE BOILER - Refer to Figs. 4.2 and 4.3

Lift the boiler and locate it on the mounting bracket - the boiler should be lifted

Pour water into flue duct
(to fill condensate trap)

by two persons.

Note: When handling or lifting always use safe techniques - keep your back

straight, bend your knees, don't twist - move your feet, avoid bending forwards
and sideways and keep the load as close to your body as possible.
Where possible transport the boiler using a sack truck or other suitable trolley.
Always grip the boiler firmly, and before lifting feel where the weight is concentrated
to establish the centre of gravity, repositioning yourself as necessary.

Location for
wall mounting
bracket on
rear of boiler

4.5 CONNECT THE PIPEWORK - Fig. 4.4

1. Thoroughly flush out all the water pipework. Refer to Section 3.9.

2. Fit the valves to the boiler connections as shown in Fig. 4.4 - note the
colours of the operating levers.

3. Connect the system pipework to the union fittings on the valves just fitted.

Note: When soldering bends, ensure they are not connected to the

valves, otherwise the internal seals may be damaged.

One metre of copper pipe must be fitted to the boiler before connecting to any plastic pipework conforming to

BS 7291.

4. Connect the flexible condensate pipe to the rubber connector as shown in Fig. 4.4. Using the adaptor supplied, connect
the flexible pipe to the condensate drain.

Ensure that the condensate discharge pipe is as required in Section 3.10.

5. Ensure that all the valves are closed (operating lever at right angle to valve) and do not turn on the water or gas supplies
at this stage.

Fig. 4.3 - rear of boiler

Condensate discharge pipe

Hot water outlet

Gas service cock (yellow)

Electrical connection

30

Cold water inlet, filter and restrictor

65 70 457095 95

AB C

A - Gas inlet - (22 mm)

B - DHW outlet elbow - (15 mm)

C - Cold water mains inlet - (15 mm)

D - Heating return - (22 mm)

E - Heating flow - (22 mm)

Safety valve operation indicator

Heating return valve

Heating flow valve

120

Heating drain point

D

E

Fig. 4.4

Alpha Evoke 28 and 33 - Installation

17

4.6 FIT THE FLUE - Figs. 4.5 and 4.6

The following procedure applies to fitting an Alpha CD Easy-Flue to both rear or side exit flue - horizontally only.

1. The CD Easy-Flues are suitable for use in the flue length ranges shown in the tables below.

Note: Where the length is less than the minimum or more than the maximum, refer to Section 4.7.

(B + C)

B (mm)

Max

530

975

Min

305

765

Side Flue

(B)

Rear Flue

CD Easy-Flue

500 mm

1000 mm

Note: Add 45 mm to
dimension B if the wall jig is
used.

Fig. 4.5 Fig. 4.6

2. Determine the overall length (L) of flue required, (see Fig. 4.7) as follows:-

Rear flue L = wall thickness (B) + 60 mm (105 mm if the wall jig is used)

Side flue L = wall thickness (B) + distance between boiler and wall (C) + 145 mm

L

Seal Joint with Tape

CD Easy-Flue

500 mm

1000 mm

B + C (mm)

Max

Min

440

215

885

675

Fig. 4.7

3. Adjust the telescopic section of the flue to the distance ‘L’, ensuring that the two labels marked ‘TOP’ are aligned, then
seal and secure the joint between the ducts with the sealing tape supplied.

Note: Always ensure that there is a minimum overlap of 25 mm when fully extending the telescopic section.

4. Pass the flue assembly through the wall (from inside or outside).

Note: Internal fitting - If there is no access to make good the outside wall, locate the outside (black) flue sealing collar

onto the outer duct of the flue immediately before the terminal grille onto the location provided. Push the flue assembly
through the 130 mm flue hole, so that the collar completely passes through the wall. Then pull the flue assembly back into
the correct position. Visually check that the collar is sealing the outside wall and that it is not restricting any of the openings
of the flue terminal.

Note: Silicone grease or other lubricants must not be used on the flue joints or seals.

Where a flue terminates less than 150 mm below a gutter, eaves or other obstructions it is possible to extend the flue to

allow the flue termination to clear the obstruction, providing the flue is not extended beyond the first joint. For situations
below balconies or large eaves where extensions may be required, the flue must be supported using the correct
brackets. Alternatively plume management components can be used with supports where necessary.

Alpha Evoke 28 and 33 - Installation

18

Fig. 4.8 - Fitting the flue from inside

Check collar is sealing
the wall and it is not
restricting any openings
of the flue terminal

130 mm

5. Position the smaller Easy-Flue 40 mm clamp (with seal) supplied, over the bend. Fit the bend to the boiler and rotate to
the correct position. Secure in position using the clamp. Ensure the clamp is located centrally over both the bend and
boiler adaptor.

6. Fit the inside (white) flue sealing collar over the Easy-Flue. If it was not previously fitted, fit the outside (black) flue
sealing collar onto the flue immediately before the terminal grille onto the location provided.

7. Slide the larger Easy-Flue 45 mm clamp over the outer duct and pull the flue assembly towards the bend, locating the
inner duct into the seal joint on the bend. Ensure the labels marked 'TOP' are positioned at the top before securing the
flue assembly to the bend with the clamp (two screws) located centrally over the joint.

Note: Check the flue terminal protrudes 120 mm out of the wall and the inner duct of the terminal is positioned correctly

(see Fig. 4.9).

8. Make good the inside wall by pushing the inside flue sealing collar up to the wall.

The hole around the flue can be made good using the flue sealing collars supplied or using a suitable sealant/cement if

required.

Ensure the inner duct within
the terminal is at the top.

The inner duct must

Note:

be positioned to slope towards
the boiler

Flue sealing collar

Inner duct seal

120

20

Terminal

65

Note: Ensure the outer flue duct is horizontal

CD Easy-Flue

40 (85 if wall jig used)

Inner duct

Easy-Flue 45 mm clamp

Elbow seal joint

90° bend

Easy-Flue
40 mm clamp
and seal

Side of boiler

135 (180 if wall jig used)

Fig. 4.9 - Rear flue

4.7 REDUCING THE FLUE - Fig. 19

When the flue length required is less than the minimum stated in Section 4.6, paragraph 1, refer to Fig. 4.10.

Discard the first telescopic section (not the section with the terminal) of the Easy-Flue 1000 mm or 500 mm and cut to the
required length.

Note: Ensure that all cuts are square and free from burrs.
Once assembled with the components pushed home, the flue is fully sealed.

Allow 20 mm 30 mm

Do not cut past this point

Fig. 4.10

Alpha Evoke 28 and 33 - Installation

19

Front of boiler

4.8 EXTENDING THE FLUE - Fig. 4.11

Note: The flue assembly length must not exceed the maximum length stated, including the equivalent lengths of any
extensions, bends etc. used for plume management components. Evoke boilers must not exceed the maximum of an

equivalent horizontal flue length of 12 m.

1. When the flue length required is more than the maximum stated in Section 4.6, paragraph 1, refer to the table below
and Figs 4.5 and 4.6.

Rear Flue length (B)

Up to maximum:-

11.890 m

(Subtract 45 mm if the
wall jig is used)

Side Flue length (B + C)

Up to maximum:-

11.805 m

Comments

Alpha CD 750 mm flue extension (Part No. 6.2000750) or 1000 mm extension
(Part No. 6.2001050) is required to extend the range of telescopic flue.

Refer to Section 4.8 for instructions on how to extend the flue.
Note: A 130 mm flue hole (127 mm core drill) may be required in the wall.

This is when the extended flue is passed through the wall.

Additional support brackets are required when extending the flue. These are available from Alpha, Part No. 6.1000355.

2. Use the template (supplied with the boiler) to mark the required flue position, ensure the slope towards the boiler is correct.

3. Determine the overall flue length as described in Section 4.6, paragraph 2 to determine the number of Alpha CD 750 or
1000 mm flue extensions required.

4. Assemble the flue extensions together by locating the inner duct into the seal joint and secure each extension together
with the extension clamps supplied (three screws). Ensure that the clamps are positioned centrally over the joints.

Note: If it is required to cut an extension, DO NOT cut the end of the inner duct that incorporates the seal joint. Ensure

the inner duct end without the seal joint is cut so that it is 20 mm longer than the outer duct.

Ensure that all cuts are square and free from burrs.
Once assembled with the components pushed home, the flue is fully sealed.

5. Adjust the telescopic section of the Easy-Flue to the required length and secure the Easy-Flue with the sealing tape
supplied. Fit the Easy-Flue to the extensions by locating the inner duct into the seal joint and secure with the clamp
(three screws), ensuring it is located centrally over the joint.

6. Mark the end of the flue assembly 'TOP' where it is connected to the boiler, so that the 'TOP' of the flue terminal is
aligned with the 'TOP' at the boiler end of the flue assembly.

7. Pass the complete flue assembly through the wall.

8. Position the smaller Easy-Flue 40 mm clamp (with seal) supplied, over the bend. Fit the bend to the boiler and rotate to
the correct position and secure in position. Ensure the seal is located centrally over both the bend and boiler adaptor. If
the inside sealing collar (white) is being used to make good the inside wall, then it will need to be fitted before assembling
the flue.

9. Slide the larger Easy-Flue 45 mm clamp (two screws) over the outer duct and pull the flue assembly towards the bend,
locating the inner duct into the seal joint on the bend.

Ensure the inner duct within the terminal is at the top.

The inner duct must be positioned to slope towards the boilerNote:

Terminal

Flue sealing
collar

20

120

20

Alpha Evoke 28 and 33 - Installation

CD Easy-Flue

Ensure outer flue duct of Easy-Flue is horizontal

Inner seal joint

Flue length (L)

Fig. 4.11 - Side flue

Extension clamp

Inner seal joint

CD Flue extension

Ensure the flue extension slopes
downwards towards the boiler by a
minimum of 25 - 30 mm per metre

Easy-Flue 45 mm clamp

90° bend

Easy-Flue
40 mm clamp
and seal

125

220

Seal joint

45