ferroli Sigma 20 40 User guide

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Page 1

SIGMA

Wall Mounted Cast Iron,

Gas Fired Boiler for Central Heating

Fan Assisted, Room Sealed,

Electronic Flame Ignition and Control

INSTALLATION AND

SERVICING INSTRUCTIONS

Sigma 20 - 40 GC N° 41-267-17 Sigma 40 - 60 GC N° 41-267-18

cod. 3543556/0 - 10/2001

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Sigma

IMPORTANT

Your "benchmark" Installation, Commissioning and Service Record Log Book will be enclosed in your customer information pack. This record must be completed and left with the end user.

systems in the UK and to encourage the regular servicing of all central heating systems to ensure safety and efﬁ ciency.

CE MARK

CE mark documents that the Ferroli gas appliances comply with the requirement contained in European

directives applicable to them.

In particular, the appliances comply with the following CEE directives and the technical speciﬁ cations

provided from them:

• Gas appliances directive 90/396

• Efﬁ ciencies directive 92/42

• Low tension directive 73/23 (modiﬁ ed from the 93/68)

• Electromagnetic compatibility directive 89/396 (modiﬁ ed from the 93/68)

INDEX PAGE

1. TECHNICAL CHARACTERISTICS .......................................................................................3

2. INSTALLATION ...................................................................................................................6

3. COMMISSIONING AND TESTING...................................................................................22

4. ADJUSTMENT ..................................................................................................................23

5. GAS CONVERSION ..........................................................................................................24

6. MAINTENANCE AND CLEANING ..................................................................................25

7. REPLACEMENT OF PARTS...............................................................................................27

8. FAULT FINDING................................................................................................................30

9. USER INSTRUCTIONS ......................................................................................................33

C.O.S.H.H.

Materials used in the manufacture of this appliance are non hazardous and no special precautions are required when servicing.

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1. TECHNICAL CHARACTERISTICS

1.01 Introduction

The Sigma is deﬁ ned as a “room sealed” boiler, all air required for combustion is taken from outside the room in which it is installed. It is a new high performance gas ﬁ red heat generator, which is designed to provide indirect hot water and/or

central heating. The cast iron heat exchanger is suitable for use on fully pumped hot water/central heating systems, which may be sealed or open vented. A special feature of this boiler is its built-in electronic ﬂ ame ignition and control unit making burner operation completely automatic and safe.

The main components are as follows: Cast iron heat exchanger speciﬁ cally shaped for high efﬁ ciency. Ceramic ﬁ bre insulated combustion chamber One stainless steel bladed burner speciﬁ cally designed for this boiler. Fan for discharge of combustion products and intake of combustion air. Differentia l air pressure switch. For safety reasons, this ensures the burner ignites only when the fan is functioning correctly. Hermetically sealed compartment made from corrosion-resistant steel enclosing the above components. Combination gas safety valve, complete with pressure stabiliser. Central heating ﬂ ow temperature adjustment thermostat. Overheat safety thermostat. Electronic control unit for automatic ﬂ ame ignition and control. Central heating ﬂ ow temperature sensor.

1.02 Dimension

Right side view

B 85

Front view

132

Key

1 - Ø 22 mm ﬂ ow outlet 2 - Ø 22 mm return inlet 3 - Ø 15 gas inlet 4 - Rear air inlet/ﬂ ue outlet 5 - Top air inlet/Flue outlet

Model

120 50

147

600

620

200

Top view

200

Sigma 20-40

Sigma 40-60

320

400

133

220

Fig. 1

Page 4

1.03 Technical data

Sigma

Model

Sigma 20/40 Sigma 40/60

Model

Sigma 20/40 Sigma 40/60

Model

Sigma 20/40 Sigma 40/60

Heat

output

MaxkWMin

11,7 17,6

5,5

11,4

Heat

input

MaxkWMin

13,0 19,5

Gas supply pressures

G20-NG

mbar

20 20

G31-LPG

Connections

Flow

22 22

Return

22 22

Gas inlet

15 15

(net)

6,1

12,7

mbar

37 37

Max. working

Heat

input

(gross)

MaxkWMin

14,4 21,7

Minimum

mbar

3,1 6,4

pressure

C.H.circuit

bar

3 3

6,8

14,1

G20-NG

Injectors

(mm)

G20-NG

3,0

3,60

G31-LPG

1,8

2,30

Burner gas pressures

Nominal

mbar

14,0 15,3

Protection

Weight

level

IP 40 IP 40

30 35

N.B. • Maximum working temperature 82°C, adjustable between 60°C and 82°C.

Gas flow rates

G20 m3/h-NG G31 kg/h-LPG

Max

1,37 2,06

Minimum

mbar

9,0

16,0

contents

0,64 1,34

G31-LPG

Boiler water

litres

1,3 1,6

Min

Max

1,02 1,53

Nominal

mbar

Min

0,48 0,99

36 36

Gas valve

Ø 1/2”

Honeywell

VK 4105 A VK 4105 A

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1.04 General Layout and Main Components

Sigma

132

1 16 1

1091

Key

1 Fixing points

5 Room sealed compartment 7 Inlet gas-cock 10 Central heating ﬂ ow outlet 11 Central heating return inlet 16 Fan

34 11

86 121

19 Combustion chamber 21 Gas injector 22 Burner 24 Spark and sensor electrode 27 Cast iron heat exchanger 28 Flue collector from heat exchanger 34 Central heating ﬂ ow

temperature sensor

43 Air pressure switch 44 Gas valve 49 Safety overheat thermostat

151

63 Central heating temperature setting 68 Control box with P. C . B . 83 Full sequence automatic control 86 Automatic control reset switch 90 Flue outlet pressure test point 91 Air pressure test point

121 Boiler shut-down warning 132 Flue gas deﬂ ector

22 21 7

151 Drain tap

1.05 Boiler water ﬂ ow diagram

Pressure loss diagram

300

200

100

90 80

70 60

Pressure drop mm wg

1 = Sigma 20-40

.1 .2

2 = Sigma 40-60

.3 .4 .5 .6 .7 .8 .9 2 31

Water flow rate (m

/h)

Fig. 2

Fig. 3

C.H.

Air in

Flue out

out

Gas in

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2. INSTALLATION

2.01 Important notices

Assembly, installation, ﬁ rst start up and maintenance must be carried out by competent persons only, in accordance with all current technical regulations and directives.

Gas Safety (Installation & Use) Regulations: 1996

In the interest of safety, it is the law that all gas appliances are installed by a competent person in accordance with the above Regulations, Building Regulations/Building Standards Scotland, Codes of Practice, current I.E.E. Regulations and the byelaws of the Local Water Undertaking. Failure to comply with the Regulations may lead to prosecution; it is your responsibility to ensure that the law is complied with.

This appliance must be installed strictly in accordance with these instructions and regulations:

The Gas Safety Regulations (Installations & Use) 1996. The Local Building Regulations. The Building Regulations. The Buildings Standards (Scotland - Consolidated) Regulations. British Standards Codes of Practice: B.S. 5440 Part 1 2000 Flues B.S. 5440 Part 2 1989 Air supply B.S. 5449 1990 FORCED CIRCULATION HOT WATER SYSTEMS B.S. 6798 1987 INSTALLATION OF GAS FIRED HOT WATER BOILERS B.S. 6891 1989 GAS INSTALLATIONS B.S. 7671 1992 IEE WIRING REGULATIONS B.S. 4814 1990 SPECIFICATION FOR EXPANSION VESSELS B.S. 5482 1994 INSTALLATION OF LPG B.S. 7593 1992 TREATMENT OF WATER IN DOMESTIC HOT WATER CENTRAL HEATING SYSTEMS Model Water Bye Laws For Northern Ireland the rules in force apply

N.B. For Northern Ireland the rules in force apply.

Important - If the boiler is to be ﬁ tted in a timber framed building it should be ﬁ tted in accordance with

the institute of gas engineers publication IGE/UP/1. If in doubt advice should be sought from the Local Gas Region of British Gas Plc.

2.01.01 Location of Boiler

The installation of the Sigma must be on a suitable non-combustible load bearing wall which will provide an adequate ﬁ xing for the boiler mounting bracket assembly. The location should be in an area where the water pipes will not be subjected

to frost conditions. In siting the boiler the following limitations must be observed: The boiler 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 applicable in Scotland, with respect to the installation of the boiler in a room or internal space containing a bath or shower. Where a room sealed appliance is installed in a room containing a bath or shower any electrical switch or appliance control utilising mains electricity must be situated so that it cannot be touched by a person using the bath or shower.

2.01.02 Air Supply

The room or compartment in which the boiler is installed does not require a purpose provided vent when using the standard concentric ﬂ ue.

2.01.03 Flue System

The boiler allows the ﬂ ue outlet to be taken from the rear of the boiler, from either side or vertically. It is absolutely essential, to ensure that products of combustion discharging from the terminal cannot re-enter

the building, or enter any adjacent building, through ventilations, windows, doors, natural air inﬁ ltration or forced ventilation/air conditioning.

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2.01.04 Gas Supply

If necessary the local Gas supplier should be consulted, at the installation planning stage, in order to establish the availability of an adequate supply of gas. An existing service pipe must not be used without prior consultation with the Local Gas supplier. A gas meter can only be connected by the Local Gas supplier, or by a Local Gas suppliers Contractor. Installation pipes should be ﬁ tted in accordance with BS6891-1988. Appliance inlet working pressure must be 20mbar MINIMUM (Natural gas - G20) or 37 mbar MINIMUM (LPG - G31).

Pipework from the meter to the combination boiler must be of an adequate size. Do not use pipes of a smaller size than the combination boiler inlet gascock connection. The complete installation must be tested for gas soundness and purged as described in BS6981-1988. All pipework

must be adequately supported.

2.02 Water System (sealed systems)

Central heating

Detailed recommendations are given in BS6798, BS5449, BS6700 and CP342 Part 2. Pipework not forming part of the useful heating suface should be insulated to prevent any heat losses or possible freezing (i.e. in roof spaces or ventilated underﬂ oor spaces). Drain taps should be positioned at the lowest point of the system in accessible locations to permit the whole system to be drained down. The drain taps should be in accordance with BS2879. Copper tubing to BS2871, Part 1 is recommended for water carrying pipework. Pipework in horizontal runs should have a gradient where possible to facilitate the removal of air. Ensure that the boiler heat exchanger is not a natural point for air collection. A typical sealed heating system illustrated in ﬁ g. 4.

Typical sealed fully pumped heating system

Gas

Pump

Filling point

Expansion vessel

Cold water

Note: A bypass must be ﬁ tted as far

as possible from the boiler if thermostatic radiator valves are ﬁ tted thoughout.

Fig. 4a

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Schematic layout for gravity DHW and pumped CH for Sigma Boiler

Static Head

15 mm

min. 1 m

Open Vent

Motorised valve

22 mm

28 mm gravity DHW

28 mm

max. 150 mm

Open

Vent

Isolating valve

To DHW taps

Isolating valve

Drain

Motorised valve 22 mm CH

Radiator Radiator

Flow

CH Pump

By-pass

Return

Fig. 4b

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Important - If thermostatic radiator valves are ﬁ tted throughout a bypass must be ﬁ tted to ensure a minimum ﬂ ow rate through the boiler of 6 l/min. The bypass should be ﬁ tted as far as possible from the boiler.

2.02.01 Safety valve

A safety valve complying with the requirements of BS 6750 Part 1 must be ﬁ tted close to the boiler on the ﬂ ow pipe by means of a horizontal or vertically upward connection with no intervening valve or restrictions and should be positioned to facilitate testing. The valve should be pre-set and nonadjustable to operate at a pressure of 3 bar (45 Ibf/in2). It must be arranged to discharge any water or steam through a pipe to a safe outlet position.

2.02.02 Pressure gauge

A pressure gauge of minimum range 0-4 bar (0-60 Ibf/in2) with a ﬁ ll pressure indicator must be ﬁ tted to the system, preferably at the same point as the expansion vessel in an easily visible position.

2.02.03 Venting

A method of venting the system during ﬁ lling and commissioning must be provided by ﬁ tting automatic air vents or by venting manually.

2.02.04 Expansion vessel

In a sealed system an expansion vessel complying with the requirements of BS 4814 must be ﬁ tted to the system by means of a connection close to the inlet side of the circulating pump in accordance with the manufacturers instructions, the connecting pipe being unrestricted and not less than 15 mm (1/2 in) nominal size. The volume of the vessel should be suitable for the system water content and the nitrogen or air charge pressure should not be less than the system static head.

Further details of sealed system design can be obtained from BS 5449: Part 1 and the British Gas publication entitled Speciﬁ cations for Domestic Wet Central Heating Systems.

2.02.05 Water treatment

If water treatment is used ferroli limited recommend only the use of Fernox or Sentinel water treatment products, which must be used in accordance with the manufacturers instructions. For further information contact:

Fernox Manufacturing Co. LTD. Sentinel Division Tandern house, Marlowe Way Betz Dearborn LTD Croydon, surrey, CRO 4YS Widnes, Cheshire WA8 8ND Te l: 0870 5601 5000 Te l : 0151 424 5351

Note - If the boiler is installed in an existing system any unsuitable additives must be removed by thorough cleansing. All systems should be cleansed according to B.S. 7593.

Note - In hard water areas treatment to prevent lime scale may be necessary.

VESSEL CHARGE PRESSURE (bar)

INITIAL SYSTEM PRESSURE (bar)

TOTAL WATER CONTENT of SYSTEM

For syst. volumes other than those given above, mult. the syst. volume by the factor across.

Sizing of expansion vessels:

0.5 1.0

2.0

1.5

1.0

EXPANSION VESSEL VOLUME (litres)

Litres

13.7

6.5

25 50

75 100 125 150 175 200

3.5

7.0

10.5

14.0

17.5

21.0

24.5

28.0

0.140

12.9

19.4

25.9

32.4

38.8

45.3

51.8

0.259

27.5

41.3

55.1

68.9

82.6

96.4

110.2

0.551

1.5

4.7

9.5

14.2

19.0

23.7

28.5

33.2

38.0

0.190

2.0

10.3

20.6

30.9

41.2

51.5

61.8

72.1

82.4

0.412

1.5

2.0

8.3

16.5

24.8

33.1

41.3

49.6

57.9

66.2

0.33

Note - It is important that the correct concentration of the water treatment product is maintained in accordance with the manufacturers instructions.

2.03 Gas connection

Gas connection must be carried out using a rigid pipe. The ﬂ ow at the gas meter should be sufﬁ cient for the simultaneous use of all appliances connected to it. Connect the gas supply to the boiler according to current regulations. The diameter of the gas cock leaving the boiler is not the determining factor in choosing the diameter of the pipe between the appliance and the meter. This must be selected in relation to length and pressure drop. The whole of the gas installation including the meter should be inspected and tested for soundness and purged in accordance with BS6891-1988.

Page 10

2.04 Wall Mounting

2.04.01 Drilling Template

Sigma

200 min

100

205 min

105 min

Model

Sigma 20-40

Sigma 40-60

320

400

60 min.

140 min.

120

200

810 min

200 min 610

147

Boiler mounting plate

Ø*

200

254,5

620

5 min

Fig. 5

Minimum clearances and drilling template for standard rear ﬂ ue.

Ø90

135B

WARNING: C.H. connection on this side

350 min.

620

165 min.

200 min.

Ø118

WARNING: C.H. connection

111

200 min.

on this side

135

230 min.620

Fig. 6a Fig. 6b

Drilling template for orizontal concentric ﬂ ue. Drilling template for two pipe system with orizontal

air inlet.

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2.04.02 Wall mounting instructions for Rear Flue Application

Fig. 7

Select suitable mounting position for boiler. Refer to ﬁ g. 6 for dimensions and minimum clearance. Using the template or mounting plate mark ﬂ ue outlet and boiler mounting points.

Fig. 8

Drill four 10 mm holes 70 mm deep to accept the wall plug. Using a core drill cut hole for the ﬂ ue. Drill cut a 118 mm diameter hole if it is possible insert the ﬂ ue-pipe from outside of the room; drill cut a 127 mm diameter hole if to insert the ﬂ ue-pipe from inside of the room.

Fig. 9

Insert the plastic plugs.

4a 4b

Fig. 10a Fig. 10b

Insert ﬂ ue-pipe from inside of the room (core drill 127 mm hole)...

Ø 127

5a 5b

Fig. 11a Fig. 11b

... or insert ﬂ ue-pipe from outside of the room (core drill 118 mm hole).

Ø 118

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Sigma

6 7

Fig. 12 Fig. 13

Gently pull back until wall seal is ﬂ ush with the wall.

Fig. 14 Fig. 15

Through plate into air tube, drill two holes and ﬁ x in place using two self tapping screws n° 6 x 6mm long.

Position the wall plate on the wall. Fix plate to wall with the square gasket between the wall and the plate use the large diameter washers for the bolts ad screws.

Cut the outer ﬂ ue ﬂ ush with the ﬂ ange on the hanging plate.

Fig. 16Fig. 17

Insert the aluminium ﬂ ue pipe into white plastic outer ﬂ ue, making sure the aluminium pipe sits fully and centrally into the ﬂ ue terminal.

Mark the aluminium ﬂ ue pipe at the point it is ﬂ ush with the mounting plate. Add 15 mm to this mark and cut the aluminium inner ﬂ ue pipe at this point.

15 mm

Page 13

Sigma

12 13

Fig. 18 Fig. 19 Fig. 20

Install the inner metal ﬂ ue "a" into the adapter "b".

2.05 Top outlet ﬂ u e conversion

Lift boiler with flue pipe in place, engage inner and outer ﬂ ue, slide into position.

Make sure the inner ﬂ ue is fully engage in the ﬂ ue terminal, secure boiler with two nuts and washers "a" and "b".

Fig. 21a

Remove fan by pulling off electrical connections. Pull off air pressure switch tubes from the air pressure switch. Remove the two screws "b" and rotate the fan upward to disengage it from the securing pin "a".

Fig. 22a

Take off the four screws which ﬁ x the top sealed chamber cover, remove the cover and gasket.

Fig. 21b

Rotate the fan upward to disengage it from the securing pin "a". Remove the securing screw that locates the fan nozzle extension to the fan and remove the nozzle extension.

Fig. 22b

Rotate the cover and gasket through 90° and ﬁ t it to the rear of the boiler to cover the original ﬂ ue outlet. Secure them both in place with the four screws removed

Page 14

Sigma

5 6

For rear

Common

For top outlet

For rear outlet

Fig. 23

Remove fan mounting plate by undoing the three ﬁ xing screws "c".

Boiler is ﬁ tted as standard with Ø36 (Sigma 20-40) or Ø41 (Sigma 40-60) restrictor. Identify on 2.07 the correct restrictor for your ﬂ ue system. If it is necessary to change it. follow instructions at step 7-10, if not, go to step 11.

7 8

outlet

For top

Fig. 24

Rotate the fan through 90° so that the fan nozzle points upward. Secure the fan to the plate in the new position using screws in position "d".

outlet

Fig. 25 Fig. 26

Remove the two screws "a" from pipe connection "b".

Fig. 28

Fix the restrictor with the two screws

"a" inside the pipe connection "b".

Remove restrictor "c".

Fig. 29

Fig. 27

Insert the correct restrictor. (See section 2.07).

Reﬁ t wiring connections to fan and air pressure switch tubes ensuring correct

orientation. I.E. red tube to air pressure switch connection with red dot (+) and clear tube to air pressure switch connection with no paint marking (-). Fit the fan into the boiler rotating the front upwards to engage with the pin "a". Secure with the screws "b".

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2.06 Top outlet Flue Connection

Three different connection are available from top of the boiler, using accessories as reported on ﬁ g. 30a, b e c and on examples a next page.

Vertical Connection, concentric bend and two pipe separator can be supplied on request.

Top outlet horizontal

1 2 3

concentric ﬂ ue

Fig. 30a Fig. 30b Fig. 30c

Top outlet two

pipe system

Top outlet vertical

concentric ﬂ ue

2.06.01 Examples of top ﬂ ue connection

1 Example of concentric ﬂ ue Ø 100

with appliance bend use

Fig. 31

Note • Bear in mind that the two concentric pipes must slope downwards away from the boiler at a rate of about 3 mm/m to avoid rainwater entering the boiler. Outside, the pipes should protrude from the wall between 10 and 60 mm. Warning • Back exit with coaxial bend is not possible

2 Example of direct roof ﬂ ue outlet

and wall air inlet with 2 pipe system

Fig. 32

Warning • Back exit with Air/Flue T separator

is not possible

Fig. 30

3 Example of concentric ﬂ ue Ø 100

with vertical outlet ﬂ ue use.

Fig. 33

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Sigma

2.07 Restrictor and max ﬂ ue length

2.07.01 Concentric Flue System

First table below shows the maximum ﬂ ue lengths available for boilers with concentric systems. For correct calculation remember to include the reduction for bend and ﬂ ue terminals listed on second table.

Maximum flue length permissible

Sigma 20/40

Sigma 40/60

100 mm concentric

Vertical *Horizontal

4 m 3 m 5 m 5 m 1 m

125 mm concentric

Vertical *Horizontal

100 mm concentric back exit

* For horizontal ﬂ ueing the reduction for appliance bend are already included.

A Horizontal concentric B Back concentric C Vertical concentric

L (max. 3 m.)

L (max. 1 m.)

Reduction for bend

100 mm concentric bend 90° 100 mm concentric bend 45° 125 mm concentric bend 90° 125 mm concentric bend 45°

L (max. 4 m.)

1 m

0,5 m

0,25 m

Fig. 34 Fig. 35

To calculate the restrictor, identify your ﬂ ue pipe conﬁ guration (A, B or C) and choose the correct restrictor diameter from the restrictor table below.

Restrictor pipe configuration

L2m

Sigma

20-40

Ø36

3mL

Ø39

Ø36

Sigma

40-60

Ø41

Ø46

Ø46L

Ø41

L2m

Ø39

Ø46

Boiler is ﬁ tted as standard with Ø36 and Ø46 restrictor. For instruction on changing restrictor refer to step 7-10 at pages 14.

Fig. 36

Page 17

Sigma

2.07.02 Two pipe ﬂ ue system

1. Utilise the pipes and ﬁ ttings ﬂ ows resistance tables on the following pages and calculate the total ﬂ ow resistance in

metres-air, by adding the ﬂ ow resistances of the components in the whole air-ﬂ ue system, based on their position (vertical or horizontal, air inlet or ﬂ ue outlet).

Please note that the same ﬁ tting, identiﬁ ed by a one code (i.e. 1 pipe diameter 80, code KWMA83A), can offer

different ﬂ ow resistances if positioned as air inlet or ﬂ ue outlet, if placed vertically or horizontally.

The ﬂ ow resistance of the special two pipe ﬂ ue-air adapters do not have to be included in the calculation as

they are already included in the maximum length calculation.

IMPORTANT: the pipes and ﬁ ttings ﬂ ow resistance (reduction) have been summarised on the following page. The ﬂ ow resistance values written refer only to Ferroli pipes and ﬁ ttings.

2. Verify that the total ﬂ ow resistance calculated is less or equal to 40 metre.

3. Choose the more suitable restrictor from table below.

Tab. 3

Total flow resistance

Sigma 20/40

Use restrictor:

Sigma 40/60

0 - 20 metres

20 - 30 metres

30 - 40 metres

Ø36

Ø39

Ø41

Ø46

Example of calculation for wall inlet/outlet with 2 pipe system maximum total ﬂ ue length: 40 metres

Tab. 5

DescriptionRef.

Connection for concentric pipe cod. KWMR52A1

Air/Flue T separator cod. KWMA90U2

Male - Female flue Ø 80 mm

Flue bend 80 mm5

Air wall terminal outlet flue Ø806

Air wall terminal air Ø807

Air

Flue

Horizontal

Vertical

Horizontal

Vertical

N° of

pieces

Total

Length

reduction

already included

2,5

17,5

1 m

Total ﬂ ow resistance 17,5 m: use restrictor Ø41

Sigma 60

5 m

Fig. 37

Page 18

Pipe and ﬁ ttings reduction table (shown in Metres)

Sigma

Page 19

Sigma

2.07.03 Terminal Position

Dimensions Terminal position

D 300 mm 75 mm Not allowed 75 mm

E 300 mm 200 mm Not allowed 200 mm

F 600 mm 200 mm Not allowed 200 mm

G 300 mm 150 mmbNot allowed 150 mm

H 600 mm 300 mm Not allowed 200 mm

I 300 mm 300 mm Not allowed 300 mm

J 600 mm 600 mm N/A 600 mm

K 600 mm 1200 mm N/A 1200 mm

L 1200 mm 1200 mm N/A 1200 mm

M 1500 mm 1500 mm N/A 1500 mm

N 300 mm 300 mm N/A 300 mm

O N/A N/A N/A 50 mm

P N/A N/A See Table 2

Q N/A N/A See Table 2

NOTE N/A = Not applicable

In addition, the terminal should not be nearer than 150 mm (fanned draucht) or 300 mm (natural draught) to an opening in the building fabric formed for the purpose of accommodating

a built-in element such as a window frame, (see Figure C2). Separation distances are linked to the rated heat inputs as shown.

This dimension may be reduced to 75 mm for appliances of up to 5 kW heat input.

Directly below an opening, air brick, (0-7 kW) opening windows, etc. (>7-14 kW)

Above an opening, air brick, (0-7 kW) opening windows, etc. (>7-14 kW)

Horizontally to an opening, air brick, (0-7 kW) opening windows, etc. (>7-14 kW)

Below gutters, soil pipes or drain pipes

Below eaves

Below balconies or car port roof

From a vertical drain pipe or soil pipe

From an internal or external corner

Above ground roof or balcony level

From a surface facing the terminal (also see 6.1.2)

From a terminal facing the terminal

From an opening in the car port ( e.g. door, window) into the dwelling

Vertically from a terminal on the same wall

Horizontally from a terminal on the same wall

From the wall on which the terminal is mounted

From a vertical structure on the roof

Above intersection with roof

(kW input expressed in net)

(>14-32 kW) (>32-70 kW)

Balanced flues room

sealed

Natural

Fanned

draught

300 mm

300 mm Not allowed 300 mm

600 mm 1500 mm 2000 mm

300 mm

300 mm Not allowed 300 mm 300 mm 300 mm 600 mm

300 mm

300 mm Not allowed 300 mm 400 mm 600 mm 600 mm

Natural

draught

and Fig. 6b

and Fig. 4

Open flues

draught

150 mm

D, E

Fanned

Fig. 38

A approved terminal guard (part. No. C2) s hould be screwed

N/A

to the wall centrally over the terminal, when the distance is less than 2 m from the outside ﬂ oor.

2.08 Electrical connection

The boiler must be connected to a single phase 230V 50Hz electricity supply with a 3 A max. fuse and a bipolar switch with contact opening of at least 3 mm ﬁ tted between the boiler and the electricity supply. The boiler must always be connected to an efﬁ cient earth installation. In the electrical box, there is a 3 pole terminal block for connecting the boiler to the mains (230V 50Hz) and a 3 pole block for connecting a circulating pump (not supplied). See Wiring diagram (ﬁ g. 41a) for the connection of external control.

When the boiler is connected to an electricity main, it is essential TO ENSURE CORRECT POLARITY (LIVE: brown cable, NEUTRAL: blue cable, EARTH: yellow-green cable).

All wiring must conform to current I.E.E. regulations.

Note: If the power supply cable has to be replaced, use “0.75mm

(24/0.20) cable only to BS6500 with a maximum external

Temp.

sensor

NTC 34

101

Temp.

25°C 60°C 82°C

141 5

kOhm

1000 kOhm

185 kOhm

80 kOhm

diameter of 8 mm.

Key

63. CH temperature setting

86. Reset switch

101. Main P. C .B.

121. Boiler shut-down warning (Led) X3-X4-X5-X8. Connectors JP. Link

Fig. 39

GCP

121

Page 20

Sigma

2.08.01 Schematic wiring diagram for fully pumped system

230V ~ 50 Hz

SwL L N PL PN

Blue

BRVG

Blue

BR BL

Blue

123456789101112

Blue

YGYG

Key

16 Fan 24 Spark and sensor electrode 32 Central heating pump (not ﬁ tted) 34 Central heating ﬂ ow temperature sensor 43 Air pressure switch 49 Safety thermostat 63 C.H. temperature adjustment 72 External controls 83 Full sequence automatic control on gas valve 86 Reset switch 101 Main P.C.B. 121 Boiler shut-down warning (Led)

Fig. 40a

101

141 5

GCP

Fully

pumped

Colors key

BR Brown Blue Blue BL Black W White O Orange

121

G Grey R Red V Violet P Pink YG Yellow-Green

If there are no external controls ﬁ tted, connect the SWL terminal to permanent live in the junction box

Page 21

Sigma

2.08.02 Schematic wiring diagram for fully pumped CH and gravity DHW

230V ~ 50 Hz

SwL L N PL

from pump

Blue

BRVG

Blue

BR BL

Blue

123456789101112

Blue

YGYG

Key

16 Fan 24 Spark and sensor electrode 34 Central heating ﬂ ow temperature sensor 43 Air pressure switch 49 Safety thermostat 63 C.H. temperature adjustment 83 Full sequence automatic control on gas valve 86 Reset switch 101 Main P.C.B. 121 Boiler shut-down warning (Led)

If there are no external controls ﬁ tted, connect the SWL terminal to permanent live in the junction box

ATTENTION: In gravity system is necessary to move the jumper JP From CP to GC contact in 8X.

Fig. 40b

101

Gravity domestic

hot water

141 5

GCP

Colors key

BR Brown Blue Blue BL Black W White O Orange

121

G Grey R Red V Violet P Pink YG Yellow-Green

Page 22

Sigma

3. COMMISSIONING AND TESTING

3.01 Checks to be carried out before starting up for the ﬁ rst time

When ﬁ ring the boiler up for the ﬁ rst time, it is good practice to check: that the isolation valves between the boiler and central heating systems are open; that the central heating system is well ﬁ lled and vented; that there are no gas or water leaks from the central heating system or boiler; that the electric connections are correct and the earth wire of the boiler is connected to an efﬁ cient earthing installation; that there are no inﬂ ammable liquids or materials near the boiler; that the central heating gas pressure and ﬂ ow rate are as required.

3.02 Starting up the boiler

• Open the gas cock of the boiler.

• Vent air present in the pipe upstream of the gas valve.

• Turn on the switch (if present) or plug upstream of the boiler.

• Rotate the C.H. temperature adjustment knob above Min position.

• Set the room thermostat (if ﬁ tted) to maximum.

• At this point, the burner ignites and the boiler starts to function automatically, controlled by its control

and safety devices.

Note - If after completing the start-up procedure correctly, the burner fails to ignite and the boiler shut down warning lights up, wait about 15 seconds then press the reset switch. The reset electronic control unit will repeat the start-up cycle. If after a second attempt the burners still fail to ignite, consult the paragraph “Troubleshooting”.

Note - If there is a power failure while the boiler is in operation, the burners automatically go out and re-ignite when the power returns.

WARNING

If the system is ﬁ lled with very cold water, the boiler will automatically light due to the frost thermostat sensing the low temperature. The boiler will not shut down, until the water temperature reaches 10°C.

3.03 Shutting down

To shut down the boiler for short periods

• Set the temperature adjustment knob to "Off" position.

To shut down the boiler for long periods

• Turn off gas supply.

• Turn off the electricity supply.

IMPORTANT

The boiler is protected by integral frost protection, but if the boiler is not to be used for a long period of time, the system should be drained.

Note: The frost thermostat operates even if the temperature adjustment knob is in the OFF position and it is necessary

therefore, if the system is drained, for the external electrical and gas supplies to be isolated.

It is recommended that a label be afﬁ xed to the appliance to draw attention to the fact that the system

has been drained.

3.04 Checks and tests after ﬁ rst start-up

Check there are no leaks in the gas and water circuits. Check correct boiler start up by carrying out start up and shut down tests using the boiler stat. Check the integrity of the air-ﬂ ue pipes during boiler operation. Check that the gas consumption indicated on the meter corresponds to that given in Technical Data (paragraph

1.03). Check that water is circulating correct. Balance the radiators to ensure that the ﬂ ow and return differential

does not exceed 20°C.

Page 23

Sigma

4. ADJUSTMENT

4.01 Adjusting the gas pressure and heat output

The following adjustments must be carried out by qualiﬁ ed personnel only.

To adjust boiler heat input simply adjust the burner pressure gas via the pressure regulator on the gas valve (ﬁ g. 41).

Adjust the gas pressure at the burner by turning the pressure regulating screw: turn it clockwise to increase the burner pressure and anticlockwise to decrease it.

The diagrams indicate the variation in heat output to the water as burner working pressure is varied (ﬁ g. 42a and 42b). Adjusting boiler output to the actual requirements of the central heating system will minimise boiler cycling thus saving fuel, varying the output has virtually no effect on the efﬁ ciency and combustion characteristics of the boiler.

Outlet

pressure

Test Point

Inlet

pressure

Test Point

Pressure regulator

protection plug

OUT

Note: with LPG (G31) the pressure regulating screw must be all the way in.

Diagram of pressures and outputs

with Natural gas (G20)

mbar

654

8 9 10 11 12 13 14 15 16 17 18 19 20

mbar

Inlet

gascock

with LPG (G31)

9 101112131415161787654

Fig. 41

18 19 20

Fig. 42a

1 = Sigma 20-40

2 = Sigma 40-60

Fig. 42b

Page 24

Sigma

4.02 Adjusting central heating ﬂ ow temperature

Central heating water temperature is adjusted by rotating the control knob (ﬁ g. 52). Rotate the knob clockwise to increase water temperature, anticlockwise to reduce water temperature. Temperature can be varied from a minimum of 60°C to a maximum of 82°C. However, we recommend not operating the boiler below 50°C.

4.03 Adjusting room temperature (when a room thermostat is ﬁ tted)

Room temperature is controlled by positioning the room thermostat knob to the required value. The thermostat automatically controls the boiler, temporarily interrupting the electrical supply subject to the room heat requirements.

4.04 Adjusting central heating system pressure

The pressure of water in the central heating system is adjusted as described in the paragraph 2.02.07.

N.B. - To avoid incurring unnecessary expense, in the event of boiler shut down, check that this is not caused by a lack of

electricity or gas, or low water pressure before calling the Customer Technical Service Helpline.

4.05 Determining combustion efﬁ ciency and the composition of the ﬂ ue gases

On the boiler there are two test points, one for ﬂ ue gas and the other for air. To carry out the tests, proceed as follows:

1) Open the air and ﬂ ue gas test points;

2) Introduce the probes;

3) Switch ON the boiler;

N.B. To ensure correct readings the boiler must have reached normal operating temperature. Testing the boiler

before thermal equilibrium has been attained will give incorrect readings.

5. GAS CONVERSION

The following adjustment and conversion operations must be carried out by qualiﬁ ed personnel. FERROLI Limited accepts no liability for damage to property or personal injury resulting from tampering with the boiler by unauthorised persons. To convert the boiler from Natural gas to LPG and vice versa, the burner injector must be replaced (see ﬁ g. 43). Gas pressures must then be adjusted on the gas valve as described in the paragraph 4.01.

Note: After converting the boiler from natural gas to liquid gas, ﬁ t the orange plate in the conversion kit near the data plate.

Note: injector diameters and pressures at the main burner are given in Technical Data (1.03).

Injector

Gas valve

Full sequence automatic control

Gas cock

Fig. 43

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Sigma

6. MAINTENANCE AND CLEANING

The following operations must be carried out by Corgi registered engineers only.

6.01 Annual Servicing

The following should be checked at least once a year: Water pressure in the central heating system when cold should be

about 1 bar. If this is not the case, bring it back to this value. Check control and safety devices (gas valve, thermostats, etc) are functioning correctly. The burner and heat exchanger must be clean. To avoid damage, always clean them with a soft brush or compressed air. Never use chemical products. The expansion vessel (if ﬁ tted) must be checked. Check there are no leaks in the gas and water circuits. Check the air-ﬂ ue gas duct terminal is free from obstructions and sound. The electrode must be free from corrosion build up and correctly positioned (see ﬁ g. 44). Gas ﬂ ow and pressure must correspond to the values given in the Technical Data (paragraph 1.03). The pump must be free to rotate.

Electrode

Sectioned burner

3.5

±1

Fig. 44

6.02 Cleaning the boiler and burner

The boiler should be serviced annually. Before starting check the boiler is operating correctly then isolate the electrical and gas supply to the boiler. The heat exchanger may be cleaned by insertion of a thin metal strip e.g. steel rule, from above or below. Clean the front and rear ﬁ n sections and ensure that any blockages are cleared. The burner must never be cleaned with chemical products or steel brushes. Particular attention must be paid to all seals and ﬁ xings associated with the room-sealed compartment (gaskets, grommets, etc). Air leakage would cause pressure inside the compartment to drop, possibly tripping the differential pressure switch and thus shutting down the boiler. After cleaning particular attention should also be paid to checking stages of start-up and operation of the thermostats, gas valve and pump. If performing combustion analysis prior to servicing, the CO/CO2 ratio must not exceed 0.0004. If it does, a full service is required. After a full service the CO/CO2 ratio must not exceed 0.0008.

6.03 Sigma Servicing Procedure (only to carried out by a competent person)

1) Visually check the boiler for correct installation and ﬂ ueing.

2) Isolate electricity supply.

3) Remove cover (2 screws at bottom light and pull forward).

4) Carry out preliminary electrical checks at the boiler junction box. This is situated to the right of the sealed compartment and is accessed by lowering the control PCB compartment (1 screw).

Note: The boiler electrical supply will need to be isolated, whilst carrying out polarity checks. Any faults must

be rectiﬁ ed before proceeding.

5) If electrical checks prove o/k replace control panel and secure with ﬁ xing screw.

6) Using the inlet pressure test point on the gas valve check the inlet WORKING gas pressure, this should be 20 millibar MINIMUM for N.G. and 37 millibar MINIMUM for LPG.

This should be available at all times i.e. when all other gas appliances from the same supply are working

fully. If this is not the case, installation may be deemed AT RISK and the gas supply pipework throughout the system may have to be increased in size.

Page 26

Sigma

7) If inlet working pressure is ok using the test point on the gas valve marked OUT check the burner pressure. Burner pressures for the required heat output can be obtained from ﬁ g. 42a for natural gas and ﬁ g. 42b for LPG.

The burner pressure is adjusted by the pressure regulating screw on the gas valve see section 4.01 for detail.

8) Turn off the boiler and isolate the gas and electricity supplies.

9) Remove the sealed compartment cover (4 screw).

10) Remove the fan assembly and clean with a soft brush.

11) Remove combustion chamber front panel (4 screws) lift out ﬂ ue hood and bafﬂ e plate.

12) Slide the burner forward, disconnect the lead from the spark electrode, remove the burner and clean.

13) Clean injector.

14) Clean the heat exchanger with a suitable soft brush. DO NOT DAMAGE THE REAR INSULATION and clean

out the combustion chamber.

15) EXAMING seals on the room sealed compartment from panel and if necessary replace.

16) Re-assemble in reverse order.

17) Re instate gas and electric supply.

18) Fire the boiler and check all gas joint for soundness.

19) Re check burner pressure.

20) Check ﬂ ame picture and all controls for correct operation.

21) Check room sealed cover for leakage.

22) Check all safety devices for correct operating.

23) Check the gas rate to the boiler is correct.

24) If a combustion analyzer is to be used, there are 2 test point on the front of the room sealed cover at the

top, the lower one is for the ﬂ ue gases the upper one for incoming air. The boiler should be operated for at least 10 minutes before carrying out this test.

CO/CO2 ratio should not exceed 0.004 prior to servicing and 0.008 immediately after servicing.

25) Reﬁ t cover and leave boiler set to customer requirements.

Page 27

Sigma

7. REPLACEMENT OF PARTS

Before commencing with the replacement of any parts, ensure the gas and electricity are isolated.

7.01 Boiler exploded view

16 43 34

Fig. 45

Short Spares List

Key N° Description PAR T N°

16 Fan assembly (Sigma 20-40, 40-60) 800480 21 Injector Plate 3.00 (NG) Sigma 20-40 806296 " Injector Plate 1.80 (LPG) Sigma 20-40 806298 " Injector Plate 3.60 (NG) Sigma 40-60 806278 " Injector Plate 2.30 (LPG) Sigma 40-60 806282 34 Flow Temperature Sensor NTC. (all models) 806051 43 Air Pressure Switch (all models) 800150 44 Gas Valve Honeywell VK 4105 A 1092 1/2" (all models) 806267 49 Overheat Thermostat (all models) 801240 83 Full Sequence Control PLB (all models) 806659

Page 28

Sigma

7.03 To remove Outer Cover

a. Remove 3 ﬁ xing screws from the bottom of the cover.

b. Gently pull out the sides of the cover at the bottom

and lift off the top ﬁ xing lugs.

7.04 Removal of Fan Assembly (rear ﬂ ueing) ﬁ g. 46

a. Remove sealed compartment front panel (4 screws

"a").

b. Remove 2 "b" screws that secure fan assembly to

ﬂ ue hood.

c. Lift ﬂ ue of locating pin at rear.

d. Pull fan clear of the boiler and remove electrical

connection and air pressure switch tubes, noting their relevant position "c".

e. Remove fan unit from mounting bracket (3 screws).

f. Replace in reverse order.

7.05 Overheat Thermostat (ﬁ g. 47)

a. Pull overheat thermostat and securing clip "c" off

the ﬂ ow pipe.

b. Remove securing clip and electrical leads from the

overheat thermostat.

c. Replace in reverse order adding more heat sink

compound if necessary.

7.06 Air Pressure Switch Removal (ﬁ g. 47)

a. Remove electrical connection and tubes from the air

pressure switch, noting their position.

b. Remove the 2 screws "a" that secure the air pressure

switch to the electrical contacts cover.

c. Replace in reverse order.

Fig. 46

7.07 Temperature Sensor (ﬁ g.47)

a. Remove electrical connection from sensor. b. Drain off the water from the boiler using the drain tap. c. Unscrew sensor from ﬂ ow pipe.

d. Replace in reverse order, ensuring both pins "b" are

engaged on the sensor.

7.08 Burner Removal (ﬁ g. 48)

a. Remove combustion chamber front panel (4 screws).

b. Gently pull burner "a" forward or far as the ignition

lead "b" will allow. c. Remove ignition lead "b" from electrode. d. Replace in reverse order.

pressure

switch

Fig. 47

Air

Overheat

thermostat

Temperature

sensor

Page 29

Sigma

7.09 Gas Valve (ﬁ g. 49) a. Remove 4 screws "a" that secure the gas inlet isolation

cock to the bottom of the gas valve.

b. Remove the full sequence PCB "b" and housing from

the gas valve (1 screw) and place to one side.

c. Remove balance tube and earth lead from the gas

valve. d. From inside the combustion chamber remove the 3

screws "c" which hold the gas valve in place.

e. Remove gas valve and replace in reverse order.

7.10 Control PCB (ﬁ g. 50)

a. Turn boiler thermostat down to the off position and

pull the thermostat knob off "a".

b. Remove ﬁ xing screw securing the control PCB "b"

housing in place and hinge down the housing. c. Remove the electrical connections from the PCB,

noting their position. d. Remove the 2 plastic nuts from outside the housing

that hold the ﬁ xing pins in place and gently push the

pin inside the housing. e. Very carefully, push the reset button "c" inside the

housing and remove the PCB. f. Remove the ﬁ xing pins from the PCB and swap over

to the replacement. g. Replace in reverse order.

Fig. 48

7.11 Heat Exchanger (ﬁ g. 51) a. Lift fan and ﬂ ue hood assembly "a" o ut of b o iler, remove

all connection from the fan, noting positions. b. Remove air pressure switch "b". c. Drop control PCB compartment out of the way "c".

d. Disconnect ﬂ ow and return unions "d" from heat

exchanger. e. Remove heat exchanger connection nipples and lift

out heat exchanger. f. Replace in reverse order.

Fig. 49

Fig. 50

Fig. 51

Page 30

Sigma

8. FAULT FINDING

Before commencing any fault ﬁ nding procedure on the boiler, ensure electricity is on to the appliance, the gas supply is turned on, purged and is sound, and the system is full of water. Note: in certain condition the fan and overheat thermostat may have 230 v at their terminals, but the fan will not run. Intermittent problem may be due to the temperature sensor breaking down when under load although the resistance value may be within the stated range. Sticking gas valves may lead to boiler lock out problems. It is not possible to test for power to the gas valve due to the nature of the plug on sequence board.

8.01 Boiler Operating Sequence

Permanent live to boiler Switched live from controls read Boiler thermostat calling

Temperature sensor calling When all the above is present, the pump connection becomes live and the pump runs. The grey wire of the control board on X5 becomes live, 230 v. Air pressure switch has 230 v to the normally open (N.O.) contact. Fan motor and overheat thermostat have 230 v al both terminals to earth.

If the air pressure switch is open circuit between its N.O. and common contact, the voltage at the overheat thermostat to earth drops to almost zero. The white wire of the fan becomes a neutral and the fan runs. The air pressure switch operates to make a circuit between its N.O. and common contacts. If the overheat thermostat is closed circuit the ignition electrode will spark the gas, valve opens and the burner lights.

8.02 Troubleshooting - Quick reference guide

N.B.: To avoid incurring unnecessary expense, in the event of boiler shut down, check that this is not caused by a lack of electricity, gas or low water pressure before calling the Customer Technical Service.

PROBLEM CAUSE and REMEDY

Boiler lockout After a number of attempts at ignition, the electronic unit always shuts down

the boiler

from corrosion deposits

Burner fails to ignite No electricity Wait for electricity to be restored Blocked injector

Clean injector

Faulty ﬂ ow temperature sensor Replace ﬂ ow temperature sensor Faulty gas valve

Repair or replace gas valve

Fan not running

Faulty pressure switch or obstructed pipes Replace the pressure switch or clear the pipes

Check tha t the ﬂ ue is clear and ﬁ tted correctly and that air has been vented from the pipes - polarity is correct Check that the electrode is positioned correctly and free

Check that electricity is reaching the fan

Page 31

Sigma

No spark to the electrode During the ignition phase, there is no spark to the electrode

from corrosion deposits Control thermostat set too lo

Burner goes out Insufﬁ cient gas supply

Check gas pressure to main burner

Boiler dirty

Check and clean heat exchanger

Burner or injector dirty

Faulty ﬂ ow temperature sensor Replace ﬂ ow temperature sensor

Boiler operates but Incorrect gas pressure temperature fails to rise

Boiler dirty

Check and clean heat exchanger

Boiler inadequate

Check that the boiler is correctly sized for the requ central heating system

Check the boiler is connected to the mains and is efﬁ ciently earthed Check the safety thermostat Check the electrode is positioned correctly and free

Check the electric supp Check the electronic control unit Check the live-neutral wires are not reversed

Check and clean burner or injector

Check for correct gas consumption

irements of the

Condensate in boiler Thermostat set too low

Adju

Incorrect gas rate

Check that gas consumption is correct and adju

Boiler sooting Faulty ﬂ ame adjustment

and that gas consumption is correct for the boiler outpu

Radiators cold in winter Faulty ﬂ ow temperature sensor Replace ﬂ ow temperature sensor Room thermostat set too low or faulty

Adju

Pump is stuck and fails to rotate

Free the pump a screwdriver

The pump does not rotate

Replace the condenser or pump

st thermostat to a higher temperature (more than

st pressure if necessary

Check that the burner ﬂ ame is adju

Burner air ports blocked

Clear air ports

st knob to a higher temperature and if necessary replace stat

by removing the top and rotating the shaft with

sted correctly

after checking electricity supp

50°C)

Page 32

8.03 General test and fault ﬁ nding chart

Sigma

yes

check for

continuity

through

overheat

thermostat

change

overheat

thermostat

fan runs

yes no

eletrode

sparks

boiler

locks out

with fan running

electrical

connections to air

pressure switch removed. check for continuity between

common and

normally open

contacts of the air

pressure switch

yes

boiler does not work

230V at live connection

of terminal block

230V at switched

live connection of

terminal block

230 v on grey wire of block x5 on main pcb

yes

fan runs

230 v at both fan

terminals to earth

yes

noyes

check air pressure

switch and

change if

necessary

change sequence pcb

on gas valve

check mains supply

check external

resistance of the temp

sensor between 80

kohm at 80°c and

1mohm at 25°c

yes no

change

main pcb

and fuse

controls

change

temperature

sensore

yes

burner lights but

boiler continues to

spark and locks out

check resistance through coils of

gas valve

1320 ohms between top two pins

2800 ohms between bottom two pins

change gas

valve assembly

yes

reverse polarity

yes

retify

has the

problem been

intermittent

at all

yes

Page 33

Sigma

9. USER INSTRUCTIONS

The boiler is designed for use with two types of gas: natural gas NG or propane (LPG). The type of gas can be selected when purchasing the boiler or the appliance can be converted later on site by a competent person. It operates with technologically advanced systems such as electronic adjustment, safety and control devices. The boiler is ﬁ tted with automatic electronic ignition so there is no pilot to worry about.

Operating:

Turn up the cover to reveal the control panel. Make sure that the gas, water and electricity supplies to the boiler are turned on.

To obtain heating from the boiler, turn the temperature regulator (2) clockwise to the desired position, ensure that any other heating controls e.g. room thermostats, clock etc. are in the on position.

The boiler ﬂ ow temperature is adjusted by from panel knob

RESET

(see ﬁ g. 42) from 60°C to 82°C. Once the ﬂ ow temperature reached set value, the burner

goes out and the electronic system imposes a delay of 3 minutes before allowing re-ignition. Once heat demand is ﬁ nished, pump and burner go out. In "gravity circulation system" (see paragraph 3.07) the pump signal is an input for electronic device. If the pump

°C

Front panel

Fig. 52

MAX

MIN

OFF

is not running and there is heat demand the temperature control is set on 50°C and after 3 minutes slow start time, this level switches to a ﬁ xed value of 70°C. With the knob in "OFF" position the call for heat is disabled; but if the temperature in the ambient comes below 5°C, a frost protection overrules the off-state and a heat demand is generated.

Reset switch

Boiler shut-down warning

C.H. temperature setting knob (Min = 60°C) (Max = 82°C)

IMPORTANT

Your "benchmark" Installation, Commissioning and Service Record Log Book will be enclosed in your customer information pack. "This record must be completed and left with the end user"

Ferroli is a member of the Benchmark initiative and fully supports the aims of the programme. Benchmark has been introduced to improve the standards of installation and commissioning of central heating systems in the UK and to encourage the regular servicing of all central heating systems to ensure safety and efﬁ ciency.

"All CORGI Registered Installers carry a CORGI ID card and have a registration number. Both should be recorded in your central heating log book. You can check the installer's CORGI registration by calling CORGI on 01256 372300".

Page 34

Page 35

Page 36

Should you require help with any difficulties

call our Technical Service Helpline on

08707 282 885

Phone numbers:

Installer

Service Engineer

BECAUSE OF OUR CONSTANT ENDEAVOUR FOR IMPROVEMENT DETAILS MAY VARY SLIGHTLY FROM THOSE QUOTED IN THESE INSTRUCTIONS.

ALL SPECIFICATIONS SUBJECT TO CHANGE

Please note - to avoid incurring unnecessary expense, in the event of a boiler shut down, check this in not

caused by lack of electricity supply, gas supply or low water pressure before calling our

Customer Service Helpline.

Lichﬁ eld Road, Branston Industrial Estate, Burton Upon Trent, Staffordshire DE14 3HD

Te l. 08707 282 885 - Fax 08707 282 886