biasi M96A.24SR/C, M96A.28SR/C User guide

Wall hung, fan flue, room sealed, high efficiency gas boiler

User manual and
Installation instructions

RIVA COMPACT HE MK2

Models

M96A.24SR/C System boiler
M96A.28SR/C System boiler

Congratulations on your choice.
RIVA COMPACT HE MK2 are condensing high efficiency sealed chamber fan flue gas

boilers.
They are fully electronically controlled and have electronic ignition.

Thematerialstheyaremadeofandthecontrolsystemstheyareequippedwithgiveyousafety,
a high level of comfort and energy savings to allow you to get the greatest benefit out of
independent heating.

RIVA COMPACT HE MK2 allow a higher efficiency by reducing the flue gas temperature such
that the water vapour formed during the combustion is condensed out.
This allows a gain of useful heat that otherwise would be lost.

Remember that...

n The manual

--- must be read thoroughly, so that you will
be able to use the boiler in a safe and sen­sible way;

--- must be carefully kept. It may be necess­ary for reference in the future.

n First lighting up must be carried out by

competent and responsible engineer.

n The manufacturer

--- disclaim all liability for any translations of
the present manual from which incorrect in­terpretation may occur

--- cannot be held responsible for non--- ob­servance of instructions contained in this
manual or for the consequences of any pro­cedure not specifically described.

Using the boiler...

n Before lighting the boiler you are ad-

vised to have a professionally qualified per­son check that the installation of the gas
supply

--- is gas---tight;

--- is of the correct gauge for the flow to the

boiler;

--- is fitted with all the safety and control de­vices required by the current Regulations.

n Ensure that

--- the installer has connected the pressure
relief valve outlet to a drain pipe. The manu­facturers are not responsible for damage

caused by opening of the pressure relief
valve and consequent escape of water, if not
connected correctly to the drain.

--- the installer has connected the conden-

sate outlet to a suitable drain pipe.

n On detecting the smell of gas

--- don’t operate any electrical switches, the
telephone or any device that may produce
sparks;

--- open the windows and doors at once to
create a draught of air which will purge the
area;

--- shut off the gas cocks;

--- get the assistance of a qualified person.

n Do not touch the appliance with parts of

thebodythatarewetordampand/orbare
feet.

n Do not block or modify the condensate

outlet and pipework

n In case of structural work or mainten-

ance near the exhaust duct and/or fume ex­haust devices or their attachments, turn off
the appliance. On completion of the work,
have a professionally qualified person check
their efficiency.

n Repairs (under guarantee) must be car-

ried out only by an approved engineer, using
genuine spare parts. Thus do no more than
switching off the boiler yourself (see the in­structions).

n You r boiler allows heating up of water to

a temperature less than boiling point;

--- must be connected to a central heating

system and/or a hot water supply system,
compatible with its performance and output;

--- can be used only for those purposes for

which it has been specially designed;

--- must not be touched by children or by

those unfamiliar with its operation;

--- must not be exposed to weather condi-

tions.

n During the operation it is quite normal

that the boiler produces a white plume of
condensation vapour from the flue terminal.
This is due to the high efficiency of the ap­pliance and may be particularly evident with
low outdoor temperatures.

Safe handling of

appliance

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.

Wherepossibletransporttheboilerusingasack
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.

Safe handling of

substances

These products are manufactured in accordance
with ISO 9000 and do not, and will not, contain any

hazardous materials or substances such as as­bestos, mercury or C.F.C.’s.
The appliance packaging does not contain any
substances, which may be considereda hazard to
health.

Combustion chamber panels

Material: mineral fibres

Known hazards --- Some people can suffer red­dening and itching of the skin. Fibre entry into the
eye will cause foreign body irritation, which can
cause severe irritation to people wearing contact
lenses. Irritation to respiratory tract.

Precautions - -- Dust goggles will protect eyes.
People with a history of skin complaints may be
particularly susceptible to irritation. High dust le­vels are only likely to arise following harsh ab­rasion. In general, normal handling and use will
not present high risk, follow good hygiene prac­tices,wash hands before, touching eyes, consum­ing food, drinking or using the toilet.

Firstaid--- Medicalattentionmustbesoughtfol­lowing eye contact or prolonged reddening of the
skin.

Thermostat / Temperature gauge

Description --- Sealed phial and capillary contain­ing liquid.

Known hazards --- irritating to skin, eyes and
throat. Vapour is harmful. Inflammable --- do not
extinguish with water.

Precautions --- Do not incinerate. Avoid contact
with broken/leaking phials. Do not purposely
puncture.

Firstaidmedicalattentionmustbesoughtfollow­ing eyes/skin contact, wash with clean water.

Appliance category II
Country of destination: United Kingdom (GB) Ireland (IE)

This appliance conforms with the following EEC directive:

D Gas appliance Directive 90/396/CEE
D Boiler Efficiency Directive 92/42/CEE
D Electromagnetic Compatibility Directive 89/336/CEE
D Low voltage Directive 73/23/CEE

The manufacturer, in the continuousprocess to improve his products, reservesthe right to modify the
data expressed in the present documentation at any time and without prior notice.

The present documentation is an informative support and it cannot be considered as a contract to­wards third parties.

Gas G20 20 mbar, G30 29 mbar, G31 37 mbar

2H3+

Boiler installation and commissioning tips

n The installation must be carried out by

a qualified person who will be responsible for
observing the current Regulations.

Installing the boiler...

n Donotforgettoremovethetransitcaps

and plugs from the boiler connections these
are fitted to every boiler.

n Keep the boiler clear of dust during in-

stallation and in particular do not allow any
dust or debris to enter the top of the boiler
where the flue connection is made. It is rec­ommended that you put a dust sheet over the
top of the boiler until you are ready to make
the flue connection.

n Because every boiler is fired and tested

live at the factory, a small amount of water re­mains within the boiler. It is possible for this
water to initially cause the pump to seize. It is
therefore recommended that the pump rotor
be manually turned to free its rotation before
turning the boiler on.

n Remember to release the auto air purge

before filling the boiler.See the instructions to
identify the location of this device.

n Do not remove the cap of the pressure

test points of the air switch (top left side of the
boiler).

n Y ou are strongly advised to flush out the

system both cold and hot in order to remove
system and installation debris.

n It is also sensible to initially fire and com-

mission the boiler before connecting any ex­ternal controls such as a room thermostat.By
this method if you have a subsequent prob­lem following the addition of an external con­trol you can eliminate the boiler from your
fault analysis.

n Donotforgettorangeratetheboilerto

suit the system requirements. This pro­cedure is covered in the commissioning sec­tion of the installation manual.

n If the boiler is fitted with a digital pro-

grammer, when setting the times for auto­matic operation, remember that for every
“ON” time there must be an “OFF” time to fol­low and that on every occasion you enter a
time you must also indicate which days that
you want the boiler to follow the timed set­tings.

n Some products incorporate an anti cycl-

ing time delay . It is normal when first switch­ing the boiler on for the boiler to operate on
heating for a few seconds then switch off.
After 3 --- 4 minutes has elapsed the boiler will
then re ignite and operate perfectly normally.
The ignition delay cycle does not prevent
normal operation of the boiler to provide
d.h.w.

n If you are in any doubts as to the installa-

tion or operation of the boiler please read the
instruction manuals thoroughly and then if
necessary contact Biasi UK for advice and
assistance.

Please remember that if you are in any doubt about the installation of this product you can contact our
Technical Helpline on tel. [phone]

TABLE OF CONTENTS

1 Appliance description 2..........

1.1 Overview 2......................

1.2 Control panel 2..................

1.3 Isolation valves 2.................

1.4 Technical d ata 2.................

1.5 Operation lights 3................

3Usefuladvice 7.................

3.1 Central heating 7.................

3.2 Frost protection 7................

3.3 Condensate drain 7..............

3.4 Periodic maintenance 7...........

3.5 External cleaning 7...............

3.6 Operational faults 7...............

4 Technical information 9..........

4.1 Overview 9......................

4.2 Main diagram 10..................

4.3 Hydraulic specifications 11.........

4.4 Expansion vessel 11...............

4.5 Technical data mod. M96A.24SR/... 12

4.6 Technical data mod. M96A.28SR/... 14

5 General requirements 16..........

5.1 Related documents 16.............

5.2 Location of appliance 16...........

5.3 Flue system 16....................

5.4 Gas supply 17....................

5.5 Air supply 17.....................

5.6 Ventilation 17.....................

5.7 Condensate drain 17..............

5.8 Water circulation (c.h.) 18...........

5.9 Water treatment 19................

5.10 Electrical supply 19................

2 Instructions for use 4............

2.1 Warnings 4......................

2.2 Refilling procedure 4..............

2.3 Ignition 5........................

2.4 C.h. circuit temperature 5..........

2.5 Extinguishing 5..................

6 Installation 20....................

6.1 Warnings 20......................

6.2 Precautions for installation 20.......

6.3 Installing the bracket 20............

6.4 Overall dimensions 21.............

6.5 Joints 21.........................

6.6 Mounting the boiler 21.............

6.7 Fitting the flue system 22...........

6.8 Choice of flue 22..................

6.9 Electrical connections 25...........

6.10 External frost protection 26.........

6.11 Connecting a system boiler

to a cylinder 27...................

7 Commissioning 30...............

7.1 Electrical installation 30............

7.2 Gas supply installation 30..........

7.3 Initial filling of the system 30........

7.4 Condensatepipeandtraps 31......

7.5 Lighting the boiler 31..............

7.6 Checking the gas pressure

at the burner 31...................

7.7 Checking the burner ignition 32.....

7.8 Checking the ignition device 33.....

7.9 Checking the flue system 33........

7.10 Checking the condensate drain pipe 33

7.11 Instructing the user 33.............

USE

INSTALLATIONMAINTENANCE

8 Gas conversion 34...............

8.1 Warnings 34......................

8.2 Procedures 34....................

9 Maintenance 36..................

9.1 Warnings 36......................

9.2 Dismantling the external panels 36...

9.3 Emptying the c.h. system 36........

9.4 Combustion analysis check 37......

Abbreviations used in the manual:
C.h. = Central heating

9.5 Cleaning the primary heat exchanger 37

9.6 Checking the pressurisation

in the expansion vessel 37..........

9.7 Cleaning the burner 37.............

9.8 Checking the flue 37...............

9.9 Drain pipe inspection 37............

9.10 Visual inspection of appliance 37....

9.11 Gas pressures and tightness 37.....

D.h.w. = Domestic hot water
D.c.w . = Domestic cold water

1

1 APPLIANCE DESCRIPTION

1.1 Overview

USE

Fig. 1.1

1 Case front panel

2 Control panel

3 Control panel cover

1.2 Control panel

4 C.h. circuit temperature and pressure gauge

5 Lock --- out signal lamp

6 Lockout reset button

7 Function selector and c.h. temp. control knob

8Serviceknob

9 Appliance operation lights

The service knob 8 is useless for the normal oper­ation of the boiler.

9

78 6

It must be used only by a qualified person during
commissioning and servicing.

1.3 Isolation valves

1

13

2

3

12

11
Fig. 1.2 (bottom view of the boiler)

10 Condensate drain pipe

11 C.h. return valve

12 Gas inlet valve

13 C.h. flow valve

1.4 Technical data

For detailed technical data see section 4.5 or 4.6
of this manual.

5

4

10

Fig. 1.3

2

Appliance description

L

L

1.5 Operation lights

Three lights (9 in Fig. 1.3) give detailed indication
regarding the operation of the boiler.

The following table gives the relationship between
each of the possible light combinations and their
meaning.

A short pulse every 4
seconds:
stand ---by condition
Function selector in
position.
Anti--- freeze system active

1 second pulse every 2
seconds: normally
operating boiler. Function
selector in position

C.h. operation

Frost protect operation

Faulty c.h. temperature
probe NTC

Faulty flue temperature
probe NTC

Faulty primary circuit
(no water or low c.h.
pressure)

Faulty primary circuit
(absence of flow)

Meaning of symbols

amp OFF

amp ON

Flashing lamp, alone or simultaneously
with an other lamp.

Flashing lamp, alternate with another
lamp.

If the lights combination observed is not included
in the above table a fault may be indicated.
Reference should be made to the following table.

In this case switch off the boiler, as described in
section 2.5 on page 5 and call a competent and re­sponsible Service Engineer.

USE

Faulty air pressure sensor

Lack of burner ignition (no
ignition signal from the full
seqence ignition device)

Safety thermostat lock out

Flue temperature probe
NTC lock out

Flame detection error

Other faults

Lack of power supply or
fauly electr. control p.c.b.

3

2 INSTRUCTIONS FOR USE

2.1 Warnings

Our Company supports the Benchmark in­itiative. The Benchmark Log Book is lo­cated at the back of this manual and should
be completed by the Installing/Commiss­sioning Engineer and handed over to the

USE

User for future reference by other visiting
Engineers. Also included is the Service In ­terval Record card that should be com­pleted by the Service Engineer following
the annual service maintenance of the
boiler and system.

All CORGI Registered Installers carry a
CORGI ID card, and have a registration
number. Both should be recorded in your
Benchmark Log Book. You can check your
installer is registered by calling CORGI di­rect on 01256 372300.

In order to guarantee safety and correct oper­ation, it is essential that all the tests are carried
out by a competent and responsible service
engineer before lighting up the boiler.

The tests are described in the installation in-
structions in section 7 commissioning.

Ensure that the c.h. circuit is regularly filled
with water (even if the boiler is only used for
d.h.w. supply) checking that the pressure indi­cated on the temperature and pressure gauge
4 is not lower than that shown in Fig. 2.2.

If the pressure reading on the pressure gauge
is below that shown in Fig. 2.2, then the system
will require topping up. A filling loop is normally
provided by the installer for this purpose.

If you are in any doubt regarding this pro­cedure you are advised to contact your In­staller or an Approved Engineer.

This appliance is provided with a built in anti --­freeze system that operates the boiler when
the temperature is below 5 ˚C
Therefore, when the boiler is not lit or used in
cold weather, with consequent risk of freezing

do not switch off the boiler at the fused spur
isolation switch or close the gas inlet cock.

When you do not expect to use the boiler for a
long period and the boiler is not to be used for
frost protection then follow the instructions
giveninsection2.5onpage5.

2.2 Refilling procedure

1 Isolate the boiler from the electrical supply at

the fused spur. Reconnect the filling loop as
demonstrated in Fig. 2.1.

Control valve

Double check valve

Te m p o r a ry
connection

Supply pipe

(cold water i nlet)

C.h. return pipe

Fig. 2.1

2 Open the valves of the filling loop and watch

the gauge until it reaches normal filling pres­sure as shown in Fig. 2.2.

Fig. 2.2

3 Close the valves and remove the filling loop.

If you experience any difficulty with the oper­ation of the boiler, switch off the boiler immedi­ately at the fused spur isolation switch and
contactyourInstalleroranapprovedService
Engineer

Air introduced into the boiler during this filling pro­cess will vent through the automatic air purger
fitted to the boiler. You may also find it necessary
to vent air from your radiator circuit using your
radiator key, however be aware that excessive
venting will cause the pressure in the system to
drop.

Always ensure that the pressure gauge is set at the
required pressure.

Control valve

4

Normal filling
pressure

4

Instructions for use

2.3 Ignition

1 Check that the valves located in the lower part

of the boiler are open (Fig. 2.3).

Open position

Fig. 2.3

2 Turn on the electricity supply to the boiler,

switching on the fused spur isolation switch.
The appliance operation light 9 (Fig. 2.4) will
flash every 4 seconds (stand--- by condition).

3 To operate the boiler, position the function se-

lector 7 as in Fig. 2.4.
The appliance operation light 9 will flash every
2 seconds (operating boiler).

79

Adjustment of the boiler temperature alters the
gas flow at the burner according to the thermal de­mand in the system. So it is usual to see the burner
lit at the minimum level for more or less long
periods.

USE

Minimum

Maximum

Fig. 2.5

Adjustment

In order to achieve optimal settings for economy
and comfort, we recommend adjusting the oper­ating temperature of the c.h. water according to
the outside temperature, positioning the knob as
follows:

From 5 to 15 ˚C

Between

--- 5 a n d + 5 ˚C

Fig. 2.4

2.4 C.h. circuit temperature

The output temperature of c.h. water is adjustable
from a minimum of about 40°C to a maximum of
about 85°C (Fig. 2.5), by turning the function se­lector (7).

Adjustment of c.h. output on the boiler is auto­matic. The greatest output pre---set in the factory
can, however, be reduced in level according to
actual system requirements; this does not affect
the maximum output in d.h.w. operation.

Such adjustments must be carried out by a quali­fied person; therefore we advise you to contact
yourinstallerorServiceAgent.

Lower than

--- 5 ˚C

Fig. 2.6

Your qualified installer will be able to recommend
the most suitable adjustment for your system.

The temperature and pressure gauge (4, Fig. 1.3
on page 2) will allow you to check that the set tem­perature is obtained.

2.5 Extinguishing

To turn the boiler off set the function selector 7 to
the position shown in Fig. 2.7.

5

Instructions for use

The appliance operation light 9 will flash every 4
seconds.

79

USE

Fig. 2.7

When you do not expect to use the boiler for a long
period:

1 Switch off the electricity supply to the boiler, by

means of the fused spur isolation switch;

2 Shut off the gas supply cock 12 and the valves

for the water circuits fitted under the boiler
(Fig. 2.8).

3 Empty the water circuits, if necessary, as

showninsectionGeneral access and emptying
hydraulic circuits in the service manual.

12

Fig. 2.8

Closed position

6

3 USEFUL ADVICE

3.1 Central heating

For reasonably economical service install a room
thermostat.

Never shut off the radiator in the area where the
room thermostat is installed.

If a radiator (or a convector) does not heat up,
check that no air is present in it and that its valve
is open.

If the ambient temperature is too high, do not alter
the radiator valves. Reduce the central heating
temperature instead by means of the room ther­mostat and the function selector (7 in Fig. 3.1).

7

Fig. 3.1

3.2 Frost protection

This appliance is provided with a built in anti --­freeze system that operates the boiler when the
temperature is below 5 ˚C
Therefore, when the boiler is not lit and used in
cold weather, with consequent risk of freezing do

not switch off the boiler at the fused spur isola­tion switch or close the gas inlet cock.

3.3 Condensate drain

Thecondensatedrainmustnotbemodifiedor
blocked.
Blockage of the condensate drain, caused by de­bris or freezing, can cause automatic shutdown of
the boiler.

If freezing is suspected and the pipe run is access­ible an attempt may be made to free the obstruc­tion by pouring hot water over the exposed pipe
an cleaning any blockage from the end of the
pipe. If this fails to remedy the problem the assist­ance of a CORGI registered installer or in IE a com­petent person should be sought.

3.4 Periodic maintenance

For efficient and continuous operation of the
boiler, it is advisable to arrange maintenance and

cleaning by an Authorised Service Centre En­gineer, at least once a year.

During the service, the most important compo­nents of the boiler will be inspected and cleaned.
This service can be part of a maintenance con­tract.

In particular, you are advised to have the following
checks carried out:

--- primary heat exchanger;

--- burner;

--- exhaust fume duct and flue;

--- pressurisation of the expansion tank;

--- filling up of the central heating circuit;

--- bleeding of air from the central heating system;

--- general check of the appliance’s operation.

3.5 External cleaning

Before carrying out any cleaning, disconnect the
appliance from the electrical mains, using the
fused spur isolation switch fitted adjacent to the
appliance.

To clean the external panels, use a cloth soaked in
soapy water. Do not use solvents, abrasive powd­ers or sponges.

Do not carry out cleaning of the appliance and/or
its parts with readily flammable substances (for
example petrol, alcohols, naphtha, etc.).

3.6 Operational faults

If the lock --- out signal lamp comes on

this indicates that the safety lock--- out 5 (Fig. 3.2)
has stopped the boiler

To re ---start the boiler, it is necessary to press the
boiler reset button 6 (Fig. 3.2).

5

6

Fig. 3.2

Forthe first lighting up and followingmaintenance
procedures for the gas supply, it may be necess­ary to repeat the resetting operation several times
so as to remove the air present in the pipework.

USE

7

Useful advice

After five consecutive resetting attempts the reset
button is inhibited. To restore its function it is
necessary to switch the boiler off and on from the
electrical mains, using the fused spur isolation
switch fitted adjacent to the appliance.

Safety lock--- out may occour even in case of an

USE

blockage of the condensate drainage (e.g.
plugged drain pipe).

It is advisable to check the condensate drainage
pipe and traps for cleaness.

In case of persistent lock--- out call a competent
and responsible service engineer.

If noises due to air bubbles are heard during
operation...

you should check that the pressure on the tem­perature and pressure gauge (Fig. 2.2 on page 4)
is not below the correct setting.
If required, top up the system correctly, as de­scribed in the section 2.2 of this manual.
Bleed any air present in the radiators, if necessary.

If the pressure on the temperature and pres­suregauge(4onpage2)hasgonedown...

it is necessary to top up the appliance with water
again, so as to raise the pressure to an adequate
level as described in the section 2.2 of this manual.

If topping up with water has to be done very fre­quently, have the system checked for leaks.

If water comes out of the pressure relief valve

Check on the temperature and pressure gauge (4
on page 2) that the pressure in the central heating

circuit is not close to 3 bars. In this case, tempera­ture rise in the circuit can cause the pressure relief
valve to open.

So that this does not happen and to decrease the
pressure to a normal value, it is advisable to vent
some of the water in the appliance through the
bleed valves present in the radiators.

If water should occasionally leak from the
boiler...

shut off the valves positioned under the boiler
(Fig. 2.8 on pag e 6) and callan AuthorisedService
Centre Engineer.

If the left appliance operation light 9 (Fig. 3.3)
flashes very quickly the boiler is detecting a
fault.

9

Fig. 3.3

In this case or in case of problems other than
those mentioned here, switch off the boiler, as
describedinsection2.5onpage5andcalla
competent and responsible service engineer.

8

4 TECHNICAL INFORMATION

4.1 Overview

15

16

36

35

34

33

32

20

31

Fig. 4.1

26

17 19

25

1814

21

23

2427

22

10 Condensate drain pipe
11 C.h. return valve
12 Gas inlet valve
13 C.h. flow valve
14 Fan

15 Air pressure sensor test points

16 Air pressure sensor

17 Flue temperature probe NTC

18 Condensing heat exchanger

19 Safety thermostat

20 C.h. temperature p robe NTC

21 Main circuit drain valve

22 Condensate trap

23 Automatic air purger valve

24 Pump vent plug

25 Pump

26 C.h. pressure relief valve

27 Modulation gas valve

28 Modulation operator

29 Gas valve outlet pressure test point

30 Gas valve inlet pressure test point

31 Primary circuit pressure switch

32 Flame---detecting electrode

33 Burner

34 Ignition electrodes

35 Combustion chamber

36 Primary heat exchanger

37 C.h. expansion tank

3 8 B y --- p a s s v a l v e

39 Fan pressure connection

40 Flue outlet pipe

41 Air intake pipe

INSTALLATION

9

Technical information

4.2 Main diagram

41

17

18

39

14

16

36

INSTALLATION

32

33

34

22

29

27

28

30

10

37

19

23

31

26

40

25

20

38

Fig. 4.2

10

21

11 1312

Technical information

4.3 Hydraulic specifications

kPa bar

0.6

60

50

0.5

40

0.4

0.3

30

20

0.2

0.1

10

0

0.0

0 200 400 600 800 1000 1200 1400

l/h

Fig. 4.3

The hydraulic specifications in Fig. 4.3 represent
the pressure (available head for the central heat­ing system) as a function of the flow rate.

The load loss due to the boiler has already been
subtracted.

Output with thermostat cocks shut off

The boiler is fitted with an automatic by ---pass
valve (38 on page 9), which protects the primary
heat exchanger.

In case of excessive reduction or total blockage of
water circulation in the central heating system
owing to closure of the thermostatic valves or sys­tem component cocks, the by---pass valve ensur-

es a minimum flow of water through the primary
heat exchanger.

4.4 Expansion vessel

Note: this boiler is designed for operation only
in a sealed central heating system

The heigh t difference between the pressure relief
valve and the highest point in the system may be
10m at most.

For greater differences, increase the pre--- load
pressure in the expansion vessel (37 on page 9)
and the system, when cold, by 0.1 bar for each
additional 1m.

Capacity

P r e --- l o a d p r e s s u r e kPa

Maximum volume of water
in the system *

Tab . 4 . 1

* Where conditions are:

--- Average maximum temperature of the system
is 85°C

--- Initial temperature when filling up the system is
10°C

For systems with volumes greater than 94 l, an
additional expansion vessel must be provided.

l 6,0

100

bar

1,0

l 94

INSTALLATION

11

Technical information

4.5 Technical data

mod. M96A.24SR/...

(B)

(B)

(A)

BTU/h

BTU/h

BTU/h

BTU/h

BTU/h

BTU/h

bar

bar

kPa

bar

band
%

band
%

Heat input

Nominal kW

Minimum kW

Useful output

Maximum kW

Minimum kW

Maximum condensing kW

INSTALLATION

Minimum condensing kW

Central heating

Maximum flow temp. ˚C 85

Minimum flow temp. ˚C 40
Minimum return temp. ˚C 40

Maximum pressure kPa

Minimum pressure kPa

Available head
(in 1000 l/h)

Seasonal efficiency
G20

Seasonal efficiency
G30 G31

25,0

85 295

11,0

37 530

24,3

82 908

10,5

35 825

26,0

88 708

11,2

38 213

250

2,5

30

0,3

25

0,25

87,6

88,5

Gas supply pressures

Gas Natural

Butane

G20

Norm. Pa

mbar

Max Pa

mbar

Min. Pa

mbar

2 000202 900293 700

2 500253 500354 500

1 700172 000202 500

1 mbar approximately equals 10 mm H2O

Gas pressures at the burner

Gas Natural

Butane

G20

Max. Pa

mbar

Min. Pa

mbar

Ignition Pa

mbar

1130

11,3

250

2,5

850

8,5

1 mbar approximately equals 10 mm H2O

Gas rate

Gas Natural

G20

m

Butane

3

/h

Max. 2,65 1,97 1,94

Min. 1,16 0,87 0,85

B

B

G30

G30

2810

28,1

580

5,8

2110

21,1

G30

kg/h

Propane

G31

37

45

25

Propane

G31

3610

36,1

780

7,8

2700

27,0

Propane

G31

kg/h

(A)

referred to the net calorific value at 15 ˚C and 1013,25 mbar

G 20 = 34,02 MJ/m

(B)

The value is used in the UK Government’s Standard Assessment Procedure (SAP) for energy rating

3,

G 30 = 45,6 MJ/kg, G 31 = 46,4 MJ/kg

of dwellings. The test data from which it has been calculated have been certified by a notified body.

(C)

Values subject to tolerance

12

Technical information

Injectors mm/100ø

Natural G20 130

Butane G30 77

Propane G31 77

Electrical Data

Voltage V~ 230

Frequency Hz 50

Power consumption W 140

Protection degree IPX4D

External fuse rating A 3

Internal fuse rating A F1--- F2 3,15 AF

Flue design

Type C12 C32 C42 C52 C82

Flue pipe diameter

Coaxial mm 60/100

Twin split pipes mm 80

Roof mm 80/125

Nominal heat flow rate

(A)(D)

Exhaust temperature

Mass flow rate

(D)

(D)

kW 25,0

˚C 71

g/s 16,0

Flue gas figures

Nominal heat input

(A)(D)

kW 25,0

CO2content % 6,5

O2content % 9,3

CO content ppm 75

Exhaust temperature

(D)

˚C 71

NOxclass 2

Weighted NO

x

ppm 99

Other specifications

Height mm 803

Width mm 400

Depth mm 350

Weight (dry) kg 41,0

Water volume in the boiler

l(kg) 4,0

(up to 1 bar)

INSTALLATION

(D)

Values refer to tests with a 1 m chimney working at the nominal heat input

13

Technical information

4.6 Technical data mod.

M96A.28SR/...

(B)

(B)

(A)

BTU/h

BTU/h

BTU/h

BTU/h

BTU/h

BTU/h

bar

bar

kPa

bar

band
%

band
%

Heat input

Nominal kW

Minimum kW

Useful output

Maximum kW

Minimum kW

Maximum condensing kW

INSTALLATION

Minimum condensing kW

Central heating

Maximum flow temp. ˚C 85

Minimum flow temp. ˚C 40
Minimum return temp. ˚C 40

Maximum pressure kPa

Minimum pressure kPa

Available head
(in 1000 l/h)

Seasonal efficiency
G20

Seasonal efficiency
G30 G31

29,0

98 942

13,0

44 353

28,4

96 897

12,5

42 648

30,4

103 721

13,3

45 378

250

2,5

30

0,3

25

0,25

88,5

89,5

Gas supply pressures

Gas Natural

Butane

G20

Norm. Pa

mbar

Max Pa

mbar

Min. Pa

mbar

2 000202 900293 700

2 500253 500354 500

1 700172 000202 500

1 mbar approximately equals 10 mm H2O

Gas pressures at the burner

Gas Natural

Butane

G20

Max. Pa

mbar

Min. Pa

mbar

Ignition Pa

mbar

1130

11,3

240

2,4

850

8,5

1 mbar approximately equals 10 mm H2O

Gas rate

Gas Natural

G20

m

Butane

3

/h

Max. 3,07 2,29 2,25

Min. 1,38 1,03 1,01

B

B

G30

G30

2810

28,1

580

5,8

2110

21,1

G30

kg/h

Propane

G31

37

45

25

Propane

G31

3600

36,0

780

7,8

2700

27,0

Propane

G31

kg/h

(A)

referred to the net calorific value at 15 ˚C and 1013,25 mbar

G 20 = 34,02 MJ/m

(B)

The value is used in the UK Government’s Standard Assessment Procedure (SAP) for energy rating

3,

G 30 = 45,6 MJ/kg, G 31 = 46,4 MJ/kg

of dwellings. The test data from which it has been calculated have been certified by a notified body.

(C)

Values subject to tolerance

14

Technical information

Injectors mm/100ø

Natural G20 130

Butane G30 77

Propane G31 77

Electrical Data

Voltage V~ 230

Frequency Hz 50

Power consumption W 150

Protection degree IPX4D

External fuse rating A 3

Internal fuse rating A F1--- F2 3,15 AF

Flue design

Type C12 C32 C42 C52 C82

Flue pipe diameter

Coaxial mm 60/100

Twin split pipes mm 80

Roof mm 80/125

Nominal heat flow rate

(A)(D)

Exhaust temperature

Mass flow rate

(D)

(D)

kW 29,0

˚C 69

g/s 17,8

Flue gas figures

Nominal heat input

(A)(D)

kW 29,0

CO2content % 6,8

O2content % 8,8

CO content ppm 52

Exhaust temperature

(D)

˚C 69

NOxclass 2

Weighted NO

x

ppm 92

Other specifications

Height mm 803

Width mm 400

Depth mm 350

Weight (dry) kg 42,5

Water volume in the boiler

l(kg) 4,1

(up to 1 bar)

INSTALLATION

(D)

Values refer to tests with a 1 m chimney working at the nominal heat input

15

5 GENERAL REQUIREMENTS

Our Company supports the Benchmark initiat­ive. The Benchmark Log Book is located at the
back of this manual and should be completed
by the Installing/Commisssioning Engineer
and handed over to the User for future r efer­ence by other visiting Engineers. Also in­cluded is the Service Interval Record card that
should be completed by the Service Engineer
following the annual service maintenance of
the boiler and system.

For Ireland (IE), it is necessary to complete a
“Declaration of Conformity” to indicate com­pliance to I.S.813.2002.

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

INSTALLATION

5.1 Related documents

The installation of this appliance must be in ac­cordance with the relevant requirements of the
current Gas Safety (Installation & Use) Regula­tions, the Local Building Regulations, the current
I.E.E. Wiring Regulations, the Regulations and
by ---laws of the local water undertaking, and in
Scotland, in accordance with the Building Stan­dards (Scotland) Reg ulation. Health and safety
document n˚ 635 ”Electricity at work regs.”.

It should also be in accordance with the British
Standard Codes of Practice:

In Ireland (IE). The installation must be carried out
by a Competent Person and installed in accord­ance with the current edition of I.S.813.2002 “Do­mestic Gas Installations” the current Building
Regulationsand reference should be made to the
current ETCI rules for electrical installations.

5.2 Location of appliance

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

For Ireland (IE), reference should be made to the
current edition of I.S.813.2002 and the current
ETCI rules for electrical installations.

Where a room --- sealed appliance is installedin
a room containing a bath or shower, any electri­cal switch or appliance control, utilising mains
electricity should be so situated that it cannot
be touched by a person using the bath or
shower.

The location must permit the provision of an ad­equate flue and termination.

For unusual locations special procedures may be
necessary and BS 6798 gives detailed guidance
on this aspect.

A compartment used to enclose the appliance
must be designed specifically for this purpose.

This appliance is not suitable for external installa­tion.

5.3 Flue system

The provision for satisfactory flue termination must
be made as described in BS 5440 part 1.

For Ireland (IE), refer to I.S.813.2002.

The appliance must be installed so that the flue ter­minal is exposed to external air.

It must not be installed so that the terminal dis­charges into an other room or space as an out­house or lean--- to. It is important that the position
of the terminal allows a free passage of air across
at all times.

The terminal should be located withdue regard for
the damage or discoloration that might occur to
building products in the vicinity.

In cold and/or humid weather water vapour may
condenseon leaving the flue terminal;the effect of
such ”steaming” must be considered.

Pluming may easily occur at the terminal. Where
possible, terminal position which could cause a
nuisance should be avoided.

16

General requirements

The minimum acceptable spacing from the ter­minal to obstructions and ventilation openings are
specified in Fig. 5.1.

Pipework must be of adequate size. Pipes of a
smaller size than the boilerinlet connectionshould
not be used.

Installation pipes should be fitted in accordance
with BS 6891 and the complete installation should
be tested for tightness.

For Ireland (IE), refer to I.S.813.2002.

BC

G

E

JK

L

Fig. 5.1

Ter m i n a l p o s iti o n m m

A Directly below a window or other opening 300. ...

B Below gutters, soil pipes or drain pipes 75. .....

C Below eaves 200. ............................

D Below balconies* 600. ........................

E Below car port roof NO. .......................

F From vertical drain pipes and soil pipes 150. ....

G From internal corners** 450. ..................

H From external corners 300. ...................

I Above ground or balcony l evel 300.. ............

J From a surface facing a terminal 600. ...........

K From a terminal facing a terminal 1 200. .........

L From an opening in the car port.

(e.g.door,window)intodwelling NO...........

M Vertically from a terminal in the same wall 1 500.
N Horizontally from a terminal in the same wall 300..
O Above the roof pitch with roof slope less.

than or equal to 30˚ 350......................

Above the r oof pitch with roof slope

more than 30˚ 600...........................

P From wall face 600. ..........................

Q From,aboveortosideofanopening 300. .......

*Wherever practicable to do so, the flue should be ex­tended beyond the perimeter of the balcony
** Consideration should be given to adding protection
against condensate to the adjacent structure

O

F

A

D

Q

H

I

P

5.5 Air supply

The room in which the boiler is installed does not
require a purpose provided air vent.

MN

I

5.6 Ventilation

If installed in a cupboard or compartment, it is not
necessary to provide additional ventilation for
cooling for this particular product. However con­sideration must be given to clearance require­ments for maintenance (see section 6.2) and
under no circumstancesmust stored articles be al­lowed to come into contact with the boiler or flue
pipe.

5.7 Condensate drain

Ensure that the condensate discharge complies
with the national or local regulations in force.

The condensate pipe must be fitted in accordance
with Building Regulations.

Drainpipe material should be resistant to acid as
the condensate is slightly acid with a pH less than

6.5.

The boiler includes a trap (22 on page 9) that pre­vents the combustionproducts entering the drain.

The boilers incorporate a condensate trap a
75mm seal ti comply with BS6798.2000.

Two schematic diagrams of possible connections
are given in Fig. 5.2 and Fig. 5.3.

The length of the condensate pipe should be kept
at minimum.

To avoid condensate being trapped:

5.4 Gas supply

The Gas meter is connected to the service pipe by
the local gas region or a local gas region contrac­tor.

If the gas supply for the boiler serves other
appliances ensure that an adequate supply is

--- the drainpipe should be run witha fallof atleast

2.5˚ (45 mm/m) away from the boiler;

--- the number of bends and joints should be kept
at minimum;

--- the drainpipe should be adequately fixed to
pevent pipe sagging.

available both to the boiler and the other
appliance when they are in use at the same time.

INSTALLATION

17

General requirements

If a part of the drainpipe runs externally this part
shouldbe kept as short as possible and protected
to reduce the risk of freezing.

Connection of condensate drainage pipe to in­ternal soil and vent stack.

A

Condensate
drain

B

D

C

450

INSTALLATION

Dimensions in mm

Fig. 5.2

ABoiler

B Internal soil and vent stack

CInvert

D 450 mm up to three storeys

Connection of condensate drainage pipe
downstream of a sink waste trap

A

Condensate
drain

E

Dimensions in mm

Fig. 5.3

ABoiler
ESink

F Open end of condensate drainage pipe direct

into gully below grating but above water level

5.8 Water circulation (c.h.)

Detailed recommendations are given in BS 6798
and BS 5449; the following notes are given for
general guidance.

For Ireland (IE), refer to I.S.813.2002.

Pipework

The return temperature must not be lower of
40 ˚C.

Copper tubing to BS EN 1057 is recommended for
water pipes. Jointing should be either with capil­lary soldered or with compression fittings.

Where possible pipes should have a gradient to
ensure air is carried naturally to air release points
and water flows naturally to drain taps.

The appliance has a built--- in automatic air release
valve, it should be ensured as far as possible that
the appliance heat exchanger is not a natural col­lecting point for air.

Except where providing useful heat, pipes should
be insulated to prevent heat loss and to avoid
freezing.

Particular attention should be paid to pipes pas­sing through ventilated spaces in roofs and under
floors.

B y --- p a s s

The appliance includes an automatic by --- pass
valve which protects the main heat exchanger in
case of reduced or interrupted water circulation
through the heating system due to the closing of
thermostatic valves or cock --- type valves within the
system.

The by--- pass is calibrated to assure a minimum
flow of 200 --- 300 lts/hr through the main heat ex­changer.

If you are installing a system that includes thermo­static radiator valves (TRV) and/or small bore

F

(8--- 10 mm) it may be necessary to fit an external
by ---pass to facilitate correct operation of the
boiler.

The fitting of an external bypass helps to prevent
and limit system noise.

Air release points

Thesemustbefittedatallhighpointswhereairwill
natural collect and must be sited to facilitate com­pletefillingofthesystem.

18

General requirements

Expansion vessel

The appliance has an integral sealed expansion
vessel to accommodate the increase of water vol­ume when the system is heated.

Refer to Tab. 4.1 on page 11 for its technical data.
If the heating circuit has an unusually high water

content, calculate the total expansion and add an
additional sealed expansion vessel with adequate
capacity.

Mains water feed: central heating

There must be no direct connection to the mains
water supply even through a non return valve,
without the approval of the Local Water Authority.

Filling

A method for initially filling the system and replac­ing water lost during servicing must be provided
and it must comply with localwater authorityregu­lations.

The correct method is shown in Fig. 5.4.

The temporary connection must be removed
immediately after filling.

Control valve

Double check valve

Te m p o r a ry
connection

Supply pipe

(cold water i nlet)

C.h. return pipe

Control valve

Fig. 5.4

The installer should ensure that no leaks exist
either inside the boiler or on the system as fre­quent filling of the system could cause premature
scaling of the heat exchanger.

5.9 Water treatment

Central heating circuit

Where a new boiler is fitted to a new system with
either plastic or copper pipes, it is important the
system is fully flushed, on completion, to ensure
flux residues, swarfs, oils and other installation de­bris is removed.

Where a new boiler is fitted to an existing system,
it is important the debris from the existing system
is fully removed in order to ensure the efficiency of
the new appliance is maintained.

Details on flushing procedure are given in the sec­tion 7.3 of this manual.

5.10 Electrical supply

Warning, this appliance must be earthed.

External wiring to the appliance must be carried
out by a competent person and be in accordance
with the current I.E.E. Regulations and any local
regulations which apply.

Reference should be made to the current ETCI
rules for electrical installations.

For Ireland (IE), refer to I.S.813.2002.

The boiler is supplied for connection to a 230 V~
50 Hz supply. The supply must be fused at 3A.

The method of connection to the electricity supply
must facilitate complete electrical isolation of the
appliance by the use of a fused spur isolation
switch. Its installation permits a complete switch­ing off in the conditions of the overvoltage cat­egory III. Alternatively it can be used a 3A fused
three pin plug and unswitched shuttered socket
outlet both complying with BS 1363.

The point of connection to the electricity supply
must be readily accessible and adjacent to the
applianceexcept were the applianceis installed in
a bathroom this must then be sited outside the
bathroom.

INSTALLATION

19

6 INSTALLATION

6.1 Warnings

The use of gas appliances is subject to
statutory control; it is essential to observe
the current regulations and laws in force
(see also chapter 5).

The appliance must discharge combustion
products directly outside or into a suitable ex­haust duct designed for this purpose.

Combustion products must be discharged
using original flue kits only, since they are inte­gral parts of the boiler.

ForLPG, the appliance must also conformwith
the requirements of the distributors and com­ply with current Regulations and laws in force.

The safety relief valve and the condensate
drain must be connectedto a suitable drain, or
discharge in a safe manner.

INSTALLATION

The electricalwiring must conform with current
Regulations, in particular:

--- the boiler must be earthed using the cor­rect bonding clamp.

--- Adjacent to the boiler a fused spur isolation
switch must be installed which permits a
complete switching off in the conditions of
the overvoltage category III. Refer to sec­tion 6.9 in this chapter for the electrical con­nections.

In no circumstances will the manufacturer
be held responsible if the warnings and in­structions contained in this manual have
not been complied with.

6.2 Precautions for installation

For the installation proceed as follows:

--- The boiler must be fixed to a strong wall.

--- The dimensions for the exhaust fume duct de-

tailed in section 6.7 and the correct procedures
for installing the duct, depicted in the instruc­tion leaflet included with the flue kit, must be
complied with during installation.

--- To allow maintenance procedures it is necess­ary to leave the minimum gaps indicated in
Fig. 6.1.

250

25 50

200

Fig. 6.1 (all dimensions in mm)

--- When installing the boiler in a cupboard, cover
or alcove allow at least 50mm permanent clear­ance from the front face of the boiler. Also en­sure sufficient clearance to allow free access
for servicing and the lowering of the front con­trol panel.

--- If the boiler is installed outside, cover the ap­pliance to protect it against the elements and
add some special anti --- freeze (neutralised) to
the c.h. system.

--- Before installing the boiler on an existing c.h.
system,flush it out thoroughlybefore fitting the
boiler, so as to remove muddy deposits.

--- It is advisable to equip the system with a sedi­ment filter, or use a water--- treatment product in
the circulating water.
The latter option in particular, not only cleans
out the system, but also has an anti--- corrosive
effect by promoting formation of a protective
skin on metal surfaces and neutralising gases
present in the water.
We recommend the use of a suitable universal
inhibitory to protect the c.h. system from cor­rosion.

6.3 Installing the bracket

Precautions

Before mounting the bracket, check that the di­mensions for fitting the exhaust fume duct are
complied with (refer to the leaflet included with the
flue kit, packed separately).

Utilise the paper template supplied with the boiler
to determine the fixing position for the bracket and
boiler. Securely mount the bracket to the wall
using appropriate fixings suitable for the type of
wall construction and capable of supporting the
total (wet) load. Refer to the weight given in the
technical data tables specific for each model.

20

Installation

6.4 Overall dimensions

C

ø80 ø80

803

245

700

C.h.
flow

50

196

35

100

60 60

47

400

115 142

Electric

connection

area

Gas

A --- a i r i n t a k e / f l u e o u t l e t p i p e ( c o --- a x i a l )
B --- flue outlet pipe ø 80 mm (twin kit)
C --- air intake pipe ø 80 mm (twin kit)

B

A

ø100

73

200

31

16

257

C.h.

return

129117

200

198

Condensate drain

connection

area

A, B and C

350

6.6 Mounting the boiler

1 Take the protective caps off the boiler pipe-

work.

2 Thoroughly clean the connections.

3 Mount the boiler on its bracket.

4 Fix the c.h. valves A and gas cock B (¾”) to the

boiler using the ¾” gaskets (Fig. 6.3)

5 Fix the ø 22 mm pipes C (c.h. circuit) to the c.h.

valves A and the ø 22 mm pipe D (gas) to the
cock B using the ¾” gaskets.

C

A

Boiler front

B

A

Fig. 6.3

6 Connect the pipe E (Fig. 6.4) from the pressure

relief valve to the safety discharge pipework.

7 Fit the condensate drain 10 (Fig. 6.4) in the air

brake connected to the drainage pipework.
See also section 5.7 in this manual.

D

C

INSTALLATION

Fig. 6.2 (all dimensions in mm)

6.5 Joints

Functions Pipe sizes (o.d)

Gas, c.h. return, c.h. flow ø22

Pressure relief valve ø15

Condensate drain ø25(plastic)

Tab. 6.1 (sizes in mm o.d.)

10E

Fig. 6.4

21

Installation

6.7 Fitting the flue system

Refer to the assembly instructions contained with­in the chosen flue kit packaging for the correct as­sembly and installation.

In general, it has to be taken in consideration that
the horizontal sections of the flue pipe must have
an horizontal sloping not less than 1.5 deg. (25
mm per metre) towards the boiler.

In the standard horizontal flue kit (Fig. 6.6A) the
flue pipe is angled within the air duct therefore the
air duct must be horizontally installed.

Ifoneormoreextensionshavetobeusedthey
must be adequately supported so that there is no
sag in the flue pipe and a minimum fall of 1,5 deg.
(25 mm per metre) over the whole length towards
the boiler is ensured.

Before fitting the flue system, ensure that the flue

INSTALLATION

gasket shown in Fig. 6.5 (given with the boiler) is
fitted to the boiler.

only be used to discharge horizontally, it is not de­signed to enable termination in the vertical plane.

Vertical kit with 90˚ elbow (Fig. 6.6B)

Co--- axial 60/100 mm

Supplied with a straight flanged adapter a co--­axial elbow and a co ---axial pipe with terminal, this
kit allows for a vertical rise of 0,5 m from the boiler.
In all circumstances the flue terminal must dis­charge horizontally and the equivalent flue length
must not exceed 2,7 metres.

Elbows 45˚ &90˚ (Fig. 6.6C)

Co--- axial 60/100mm.

Elbow kits enable the standard flue kitsto be offset
to overcome obstructions or ensure the correct
clearancesfor the flue terminal. Each elbow used
in addition to the standard flanged elbow reduces
the overall acceptable length of the flue system as
follows:

45˚ reduce length by 0,5 m.
90˚ reduce length by 1 m.

Typ e C1 2

ø 60/100

B

Min = 0,3 m
Max = 2,7 m

A

Fig. 6.5

6.8 Choice of flue

The following flue kits are available for connecting
to the boiler:

Standard horizontal flue kit (Fig. 6.6A)

Co--- axial 60/100mm --- nominal length 1m

This kit is normally supplied with the boiler and can
be fitted to allow discharge to the rear or either
side of the boiler via the flanged boiler adapter
elbow. Minimum length required is 0.3 m. Maxi­mum equivalent length of 2,7 metres can be
achieved utilising extensions. This flue system can

22

ø 60/100

90˚= --- 1 m

45˚= --- 0 , 5 m

C

Fig. 6.6

Tw i n p i p e k i t s ø 8 0 m m ( F i g . 6 . 7 --- F i g . 6 . 8 --­Fig. 6.9)

Various twin (split) pipes kits and optional acces­sories (elbows) are available to assist in the ter­mination of the flue where the boiler is installed in
a location remote to an outside wall.

These kits allow for separation of the air supply
pipe from the pipe that discharges the exhaust
gasses. Consequently it is possible to extend the
flue system to a greater distance than that pro­vided by the standard horizontal co--- axial flue.

Installation

Typ e C1 2

Fig. 6.7

If either an additional 45˚ or 90˚ accessory elbow
is used then the maximum permissible length of
either pipe must be reduced by 0.90 m or 1,65 m
respectively.

N.B: The air intake and the flue outlet must not
terminate on opposite sides of the building.

Typ e C4 2

90˚=--- 1,65 m

Typ e C8 2

Fig. 6.9

Two restrictors with different size are supplied
with the twin pipe kit and have to be installed
between the boiler and the air intake adapter
(Fig. 6.10).

Air intake adapter

Restrictor

Gasket

INSTALLATION

Typ e C5 2

Fig. 6.8

45˚=--- 0,90 m

Fig. 6.10

For the correct use of the restrictors with twin
pipes refer to Tab. 6.2.

Equivalent length
(air duct + flue duct)

Between 1 and 15 m ø50mm

More than 15 m up to 30 m ø55mm

Tab . 6 . 2

Restrictor

23

Installation

)

Vertical--- roof kit (Fig. 6.11)

Typ e C3 2

90˚= --- 1 m

max =8,5 m

ø 125

Fig. 6.11

This kit allows vertical termination of the flue pipe

INSTALLATION

through the roof. The kit is 1.2 m in length. Exten­sion pieces (Co--- axial) are also available which al­lows the flue system to be extended to a total
overall maximum permissible length.
Optional45˚ and 90˚ elbows can be used to offset
theflueroute.

Each additionalelbow reduces the overall accept­able length of the flue system as follows:

45˚ reduce length by 0,5 m.
90˚ reduce length by 1 m.

Pluming kit (Fig. 6.12)

Co--- axial ø 60/100mm + vertical part ø 60mm (flue
outlet)

Thiskitallowsthecomburentairtobesuckedup
and expel the burnt gasses directly to the outside
t h r o u g h a t e l e s c o p i c c o --- a x i a l f l u e ( 4 5 0 --- 9 5 0
mm).

In the last section, the fumes are expelled through
a vertical section.

Extensions and elbows can be added to extend
the kit’s length.

45˚= --- 0 , 5 m

Typ e C5 2

90˚=--- 0,85 m

ø60mm

45˚=--- 0,65 m

90˚= --- 1 m

ø 60/100 mm

45˚= --- 0 , 5 m

Fig. 6.12

The chart of Fig. 6.13 gives the allowable dimen­sionsoftheducts“a”and“b”ofFig.6.12

”a” vertical length (m)

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

Fig. 6.13

Each additionalelbow reduces the overall accept­able length of the flue system as follows:

45˚ (60/100 mm) reduce length by 0,5 m.
90˚ (60/100 mm) reduce length by 1 m.
45˚ (60 mm) reduce length by 0,65 m.
90˚ (60 mm) reduce length by 0,85 m.

Allowed values

”b” horizontal length (m

24

Installation

6.9 Electrical connections

Connection to the electricity supply

1 Remove the front panel of the case (see the

section 9.2 in this manual).

2 Remove the screws F and G (Fig. 6.14).

F

G

H

Fig. 6.14

3 Loosen the screws H.

4 Remove the side panels or move the lower part

of the side panels as indicated in Fig. 6.15 and
pull the control panel.
When completely pulled out, the panel can ro­tate 45˚ downwards to facilitate the operations
on the internal parts.

Fig. 6.15

5 Loosen the screws I and remove the service

panel (Fig. 6.16).

G

I

Fig. 6.16

Forthe electrical connection to the boiler use elec­tricwireswhichconform to the current regulations,
with flexible cord, each core having a cross sec­tion area notlessthan0,75mm

6 Connect the electrical supply flexible cord

coming from the fused spur isolation switch to
the power supply terminal block of the boiler
(Fig. 6.17) keeping the same connections for
the live (brown wire) and the neutral (blue
wire). External 3 A fuse or fused plug with same
current rating is recommended.

Do not connect live wires to terminals to
which the room thermostat must be con­nected.

7 Connect the earth wire (yellow/green).

Connection of a room thermostat

The room thermostat must be connected to the
terminal block situated next to the control panel.

Any external controls and connection lines
must be rated at 230 V but under no circum­stances should external live voltage be con­nected to the room thermostat link on the
boiler.

Do not connect live wires to terminals to which
the room thermostat must be connected.

When connecting any type of external control,
the link J in Fig. 6.17 must be removed.

2

.

INSTALLATION

25

Installation

k

t

LN

12

External controls
terminal block

Power supply
terminal block

J

To f u s e d s p ur
isolation switch

3

Fig. 6.17

8 Connect the room thermostat between ter-

minals 1 and 3 as shown in Fig. 6.18 or
Fig. 6.19.

INSTALLATION

T

Room thermostat

(230V rating)

LN

3

Fig. 6.18

12

Power supply
terminal block

External controls
terminal block

9 Route the electrical supply flexible cord and

the external control flexible cord as illustrated
in Fig. 6.20.
Lock the flexible cordsin place with the flexible
cord clamps

To t h e e x t e r n a l
control de vice

To t h e f u s e d s p u r
isolation switch

Fig. 6.20

6.10 External frost protection

10 Connect the frost thermostat between ter-

minals 1 and 2 as shown in Fig. 6.21 or
Fig. 6.22

Do not connect live wires to terminals to
which the room thermostat must be con­nected.

Frost Thermostat

(230V rating)

T

T

Room thermosta

(230V rating)

T

Room thermostat

with delay resistor

(230V rating)

LN

LN

3

Fig. 6.19

26

12

External controls
terminal block

Power supply
terminal block

Fig. 6.21

External controls
terminal block

12

3

Power supply
terminal bloc

Installation

Room

L

12

thermostat

with anticipating

resistor

(230V rating)

N

Power supply
terminal block

Frost

thermostat

(230V rating)

External controls
terminal block

T

T

3

Fig. 6.22

6.11 Connecting a system bo iler

to a cylinder

Two schematic wiring diagrams are given in this
section showing two possible ways to connect an

external programmer to a mid--- position diverter
valve to provide independent timed and thermo­static control of heating and hot water.

Fig. 6.23 and Fig. 6.24 are divided in two parts.
Theuppershowsthesinglecomponentsusedon
the diagrams with their connection to the 10 way
junction box. The bold numbers represent the ter­minal of the j unction box where the component
must be connected to.
The lower part shows how to realize a system that
provides independent timed and thermostatic
control of heating and hot water.

In Fig. 6.23 the boiler is permanentlyconnectedto
the main supply. The boiler operation is controlled
by the external control terminal block.

In Fig. 6.24 the boiler is not permanently con­nected to the supply line. The boiler operation is
controlled by switching the mains supply.
In this case, when the boiler is switched off some
important features like the antifreeze system, the
monitoring of the boiler b y the operation lights, the
post circulation of the pump, etc. are completely
deactivated.

For these reasons it is advisableto use the firstdia­gram (Fig. 6.23).

INSTALLATION

27

Installation

A

L

N

INSTALLATION

L

Room thermostat

MAINS
230V a.c.
Switched 3 Amp fused,
spur

B

5

4

Cylinder
thermostat

C

1

3

2

Room thermostat

AB

10 way

junction b ox

1

2

Progra mmer

BU

8
7

6

GRYE

WH

GY

OR

2
3

5
7

8

External control

terminal block

1

L

N

HTG

HW ON

HW OFF

2
4

6
7

LN

Power supply

BL

GRYE

WH

GY

OR

Cylinder
thermostat

C

remove room
thermostat link

123

bnbkbu

M i d --- p o s i t i o n
diverter valve

1

2

8

1
3
2

N

MAINS
230V a.c.
Switched 3 Amp fused,
spur

HTG = Heati ng
HW ON = Hot Water ON
HW OFF = Hot Water OFF

Valve colour key

BU --- Blue
GRYE --- Green/Yellow
WH --- White
GY --- Grey
OR --- Orange
BK --- Black
BN --- Brown

F i g . 6 . 2 3 --- P e r m a n e n t l i v e Y --- p l a n

28

L

Progra mmer

321 4 567 1098

321 4 567 1098

N

HTG

HW ON

HW OFF

123

bnbkbu

External control

terminal block

LN

Power supply

Installation

L

N

MAINS
230V a.c.
Switched 3 Amp fused,
spur

L

Room thermostat

A

B

5

4

Room thermostat

AB

1

3

2

10 way

junction b ox

Cylinder
thermostat

C

L

Progra mmer

N

1

2

HTG

HW ON

HW OFF

BU

8
7

6

GRYE

WH

GY

OR

1

2

2
3

5
7

8

8
3

2

4

6
7

LN

Power supply

BU

GRYE

WH

GY

OR

Cylinder
thermostat

C

Do not

remove room
thermostat link

M i d --- p o s i t i o n
diverter valve

1

2

INSTALLATION

N

MAINS
230V a.c.
Switched 3 Amp fused,
spur

HTG = Heati ng
HW ON = Hot Water ON
HW OFF = Hot Water OFF

Valve colour key

BU --- Blue
GRYE --- Green/Yellow
WH --- White
GY --- Grey
OR --- Orange
BK --- Black
BN --- Brown

L

Progra mmer

F i g . 6 . 2 4 --- N o t p e r m a n e n t l i v e Y --- p l a n

321 4 567 1098

321 4 567 1098

N

HTG

HW ON

HW OFF

123

bnbkbu

External control

terminal block

LN

Power supply

29

7 COMMI SSIONING

WARNING
The commissioning of this boiler and system
must only be undertaken by a professionally
qualified person in accordance with the re­quirements of the Gas Safety Installation and
Use Regulations and be approved by
C.O.R.G.I.

Ensure that the Benchmark Log Book is satis ­factorily completed during the commissioning
process. The Log Book is located at the end of
this manual. This manual should be handed to
the User following completion of the installa ­tion and commissioning process. Failure to
comply with these requirements may invali­date the manufacturers guarantee.

For Ireland (IE), it is necessary to complete a
“Declaration of Conformity” to indicate com-

INSTALLATION

pliance to I.S.813.2002.

7.1 Electrical installation

Preliminary electrical system checks to ensure
electrical safety shall be carried out by a compet­ent person. i.e. polarity, earth continuity, resis­tance to earth and short circuit.

If a fault has occurred on the appliance the fault find­ing procedure should be foll o we d as specified in the
service manual.

7.2 Gas supply installation

1 Inspect the entire installation including the gas

meter, test for tightness and purge, all as de­scribed in BS 6891;
For Ireland (IE), refer to I.S.813.2002.

2 Open the gas cock 12 (Fig. 7.1) on the

appliance and check the gas connector on the
appliance for leaks.

12

Fig. 7.1

Open position

7.3 Initial filling of the system

1 Open the c.h. flow and return valves.

2 Remove the front panel of the case (see the

section 9.2 in this manual.

3 Lift the cap on the automatic air purger valve23

(Fig. 7.2) one full turn and leave open perma­nently.

4 Gradually open stopcock at the filling point

connection to the c.h. system until water is
heard to flow; do not open fully.

23

24

Fig. 7.2

5 Open each radiator air vent starting at the

lowest point of the system and close it only
when clear water, free of bubbles, flows out.

6 Purge the air from the pump by unscrewing the

pump plug 24 (Fig. 7.2); release the pump
shaft by turning in the direction indicated by
the arrow on the information plate.

7 Replace the pump plug.

8 Continue filling the system. The actual reading

should ideally be 1,3 bar and not less than 0,3
bar.

9 Close all air release valves on the c.h. system.

10 Inspect the boiler and the system for water

soundness and remedy any leaks discovered.

11 Cold flush the system to remove any loose par-

ticles and any system debris before startingthe
boiler for the first time

The flushing procedure must be in line with
BS7593 Treatment of Water in d.h.w. c.h. Sys-

tems.

30

Commissioning

When the installation and second filling are
completed turn on the c.h. system and run it
until the temperature has reached the boiler
operating temperature. The system must then
be immediately flushed through.

This procedure must be repeated twice more.

During this operation we highly recommend
the use of a c.h. flushing detergent in the quan­titiesas specified by the appropriate manufac­turer, whose function it is to dissolve any
foreignmatterwhichmaybeinthesystem.

The above operation could save the invalida ­tion of your boilers guarantee and will also pre­vent problems which you may exper ience in
the future if a n inhibitory is not used.

7.4 Condensate pipe and traps

The full length of the condensate pipe should be
check for leaks.

The boiler has a built--- in condensate trap pro­vided with a ball valve that prevents the escape of
combustion products when the trap is empty.

It is however recommended that any other trap
in the drain system is correctly filled with water
before to run the boiler.

7.5 Lighting the boiler

Some products incorporate an anti cycling time
delay. It is normal when first switching the boiler on
for the boiler to operate on heating for a few sec­onds then switch off. After 3 --- 4 minutes has
elapsed the boiler will then re ignite and operate
perfectly normally. The ignition delay cycle does
not prevent normal operation of the boiler to pro­vide d.h.w..

If external controls are fitted (e. g. Timeclock, room
thermostat) ensure they ”call for heat”.

1 Turn on the electricity supply to the boiler,

switching on the fused spur isolation switch.
The appliance operation light 9 will flash every
4seconds.

2 Turn the function selector 7 as in Fig. 7.3. The

appliance operation light 9 will flash every 2
seconds.

79

6 5

Fig. 7.3

The boiler will now go through an ignition se­quence and the burner will light.

If during the ignition attempt period the boiler fails
to light, the full sequence control p.c.b. will go to
lockout and the lock ---out signal lamp 5 will ap­pear.

To reset the boiler press and release the boiler re­set button 6.

7.6 Checking the gas pressure at

the burner

This boiler has been tested to the highest qual­ity control standards.

The maximum and minimum gas pressures are
already set during this quality control process
however the checking procedure must be fol­lowedto ensure maximum operating efficiency
from the boiler.

1 Remove the front panel of the case (see sec-

tion 9.2 in this manual) and the sealed
chamber lid.

2 Loosen the internal screw 29 (Fig. 7.4) on the

Outlet Pressure TestPoint of the Gas Valve and
connect a pressure gauge using a suitable
hose.

3 Set the c.h. temperature control knob to its

maximum position. If external controls are
fitted (e. g. Timeclock, room thermostat) en­sure they ”call for heat”.

4 Switchontheboiler.

5 Check the maximum gas pressure and com-

pare the value on the gauge with the value indi­cated in the sections 4.5 or 4.6 (gas pressures
at the burner), accordingly with the model of
boiler installed.

INSTALLATION

31

Commissioning

6 Check the maximum gas flow at the gas meter

and compare the value indicated in the sec­tions 4.5 or 4.6 (gas rate), accordingly with the
model of boiler installed.

7 Switch off the boiler.

8 Disconnect the gas modulator coil by remov-

ing the electrical connector A (Fig. 7.4).

29

A

INSTALLATION

Fig. 7.4

9 Switchontheboiler.

10 Check the minimum gas pressure and com-

pare the value on the gauge with the value indi­cated in the sections 4.5 or 4.6 (gas pressures
at the burner), accordingly with the model of
boiler installed.

11 Switch off the boiler and re--- connect the elec-

trical connector A to the modulator coil.

12 Switch on the boiler .

13 Check that the boiler lights up uniformly.

If not refer to section “Ignition gas pressure ad­justment” of the Service Manualfor the necess­ary adjustment procedures.

14 Switch off the boiler and disconnect the pres-

sure gauge.

15 Reassemble the sealed chamber lid and the

front panel of the case (see section 9.2 in this
manual).

If the maximum and minimum gas pressures
measuredaboveare not in accordance with the
technical data (sections 4.5 or 4.6) then a djust­mentwill be necessary.A full explanationof the
gas pressure adjustment procedure is given in
the Gas Valve section of the service manual. If

maximum a nd/or minimum gas pressures are
adjusted then the ignition gas pressure must
be checked and adjusted if necessary.

Important: after the gas pressure checks and
any adjustment operations, all of the test points
and a djustment devices must be sealed. Re ­place the adjustment protection cap.

7.7 Checking the burner ignition

1 Turn the boiler OFF

2 Open the gas valve outlet pressure test point

29 (Fig. 7.4) and connect the gauge.

3 Turn the boiler ON positioning the control se-

lectors 7 in the positions as shown in as in
Fig. 7.5 and ensure that the timer selector
switch and room thermostat, if fitted, are set to
“heat demand”.

79

6 5

Fig. 7.5

4 Watch the gauge and check to see if the igni-

tion pressure registered corresponds to the va­lues as given in the Technical Data. Turn off the
boiler and reignite it by turning the function se­lector 8 to the OFF position and then back to
that indicated in Fig. 7.5

5 Repeat this process two to three times leaving

30 second intervals between each ignition.
Check the ignition pressures and visually
check that the burner lights uniformly and in a
controlled manner.

6 If the burner ignition is not uniformly controlled

then checks should be made to:

--- the flue installation and termination.

--- that the flue gasket as shown in Fig. 6.5 page

22 is in place.

--- that the burner and injectors are clean.

--- that the boiler is set for the correct gas used

(see Section Gas Conversion of this manual)

32

Commissioning

7 If the ignition pressure recorded is not as indi-

cated in the Technical Data then refer to section
“Ignition gas pressure adjustment” of the Ser­vice Manual for the necessary adjustment pro­cedures.

Important: after the gas pressure checks and
any adjustment operations, all of the test points
must be sealed and replace the adjustment
protection cap.

7.8 Checking the ignition device

With the burner on high flame close the gas cock.
After three ignition attempts (within about three

minutes), the lock---out signal lamp 5 (Fig. 1.3 on
page 2) must appear.

To reset the boiler press and release the boiler
reset button 6 (Fig. 1.3 on page 2).

7.9 Checkingthefluesystem

Thefluesystemshouldbevisuallycheckedfor
soundness. Check all clamps, gaskets and fixing
aresecureandtight.

Ensure that the flue terminal is sited correctly in ac­cordance with the flue fitting instructions and
Fig. 5.1 on page 17 of this manual.

To carry out a combustion check refer to the in­structions given in the section 9.4 of this manual.

Reference figures are given in the sections 4.5 or

4.6 of this manual (Flue gas figures).

7.10 Checking the condensate

drain pipe

Check the soundness and integrity of the conden­sate drain pipe.

Verify the cleanness and correct filling of the con­densate traps.

7.11 Instructing the user

Hand over this combined User & Installation man­ual and the Servicemanual to the end user and ex­plain how to use the unit.

Take the User step by step through the lighting in­structions.

Show the User how to switch off the appliance
quickly and indicate the position of the electric
supply isolator.

Explain the proper use and adjustment of all sys­tem controls; this will ensure the greatest possible
fuel economy.

Explain the function and use of the function selec­tor.

Explain and demonstrate the function of time and
temperature controls (if fitted).

Explain how to turn off the appliance for both short
and long periods and advise on the precautions
necessary to prevent damage should the
appliance be inoperative when freezing condi­tions may occur.

Fill in the details required on the Boiler Guarantee
Certificate and hand to the User advising them to
return the correct section for boiler Guarantee reg­istration.

Finally, advise the User that, for continued safe
and efficient operation, the appliance must be ser­viced by a competent person at least once a year.

INSTALLATION

33

8 GAS CONVERSION

8.1 Warnings

The commissioning of this boiler and sys­tem must only be undertaken by a pro­fessionally qualified person in accordance
with the requirements of the Gas Safety In­stallation and Use Regulations and be ap­proved by C.O.R.G.I.

Components used to adapt it to the type of gas
available must be genuine parts only.

8.2 Procedures

1 Check that the gas cock (12 in Fig. 8.1) fitted

under the boiler is turned off and the appliance
is switched off at the mains isolating spur.

12

Fig. 8.1

MAINTENANCE

2 Remove the front panel of the case (see the

section Generalaccessand emptying hydraulic
circuits in the service manual).

3 Takeoffthelidofthesealedchamber.

4 Take the front panel of the combustion

chamber off and remove the burner (33 on
page 9). See section Ignition and detection
electrodes in the service manual for detailed in­structions.

5 Carry out the conversion for the type of gas, re-

placing the burner injectors correctly.

6 Re --- assemble the burner, the front panel of the

combustion chamber.

7 Switch on the appliance at the mains isolating

spur.

Closed position

8 Turn the boilerOFF positioning the function se-

lector 7 as indicated in Fig. 8.2.

79 6 58

Fig. 8.2

9 Disconnect the electrical connectors of the

C.h. temperature probe NTC 20 in Fig. 8.3

20

Fig. 8.3

10 Keep pressed the reset button 6 for about 10

seconds until the lock--- out signal lamp 5
blinks.

11 Connect the the elctrical connectors of the C .h.

temperature probe NTC 20 in Fig. 8.3

12 Press the reset button 6 repeatedly (4 times)

until the lamps 9 give the indication as in
Fig. 8.4 (gas type mode).

Where: Lamp OFF

Lamp ON

Fig. 8.4

At this step it is possible to visualize the current set­ting by keeping the reset button 6 pressed for
more than 5 seconds. The lamps 9 will flash a

34

Gas conversion

number of times corresponding to the setting of
the knob 8 in Fig. 8.5.

Gas type

Setting No.

NATURAL

GAS

Fig. 8.5

Gas
supply

Natural
gas

L.P.G. 4 165 mA

Fig. 8.6

13 Tochange the setting turn the knob 8 on a posi-

tion corresponding to the gas used as shown
in Fig. 8.5.
By turning the knob 8, the lock --- out signal
lamp 5 blinks quickly (2 per seconds) indicat­ing that the setting has changed and must be
memorised.

14 To memorize the setting keep pressed the

reset button 6 for about 5 seconds until the
lamps 9 briefly blinks simultaneously.

1

Position of
knob 8

1 125 mA

Approx. Max current
through the modulator
device

L.P.G.

4

8

15 Open the gas cock (12 in Fig. 8.7)

12

Fig. 8.7

16 To reset the boiler to the normal operation turn

it ON by the function selector 7 on the desired
operation and checking the ignition pressure
and that the burner lights up uniformly. In any
case, the boiler automatically resets to its nor­mal operation after 10 minutes.

Factory setting = Natural gas (as illustrated)

17 Calibrate the gas valve according to the in-

structions given in the service manual, section
Modulating gas valve --- Adjustment.

18 Re ---assemble the lid of the sealed chamber.

19 Replace the self --- adhesive label indicating the

type of gas, and the gas pressures to which the
appliance has been set with the label included
with the conversion kit. The label is placed on
the botton of the appliance.

20 Replace the adjustment protection cap.

21 Replace the front panels of the case.

Open position

MAINTENANCE

35

9 MAINTENANCE

9.1 Warnings

The procedures detailed in this chapter must
be carried out only by a professionally
qualified person. Thus you are advised to

contact an Authorised Service Agent.

For Ireland (IE), the servicing work must be
carried out by a competent Person

For efficient and continuous operation of the
boiler you are advised to have, at least once a
year, maintenance and cleaning done by an
Approved Service engineer.

Isolate the appliance from the electricity
supply by turning off the fused spur isolation
switch adjacent to the appliance and turn off
the gas cock, before carrying out any pro-

cedures, whatsoever, for cleaning, mainten­ance, opening or dismantling boiler panels.

9.2 Dismantling the external

panels

Front panel

Air--- Flue e xhaust
Sampling points

MAINTENANCE

1 Loosen the three screws A (Fig. 9.1).

2Liftandremovethepanel.

Side panels

3 Loosen the screws B. Bring the bottom of the

panels away from the boiler and lift them, free­ingthemfromthetophooks(Fig.9.2).

B

Fig. 9.2

9.3 Emptying the c.h. system

A

1 Close the c.h. isolating valves (11 and 13 in

Fig. 9.3).

Fig. 9.1

36

Closed position

11

1213

Fig. 9.3

Maintenance

2 Open the central heating drain cock (21 in

Fig. 9.4).

21

Fig. 9.4

9.4 Combustion analysis check

If it is necessary to carry out a combustion analysis
remove the plugs indicated in Fig. 9.1.

Reference figures are given in the sections 4.5, 4.6
of this manual (Flue gas figures).

9.5 Cleaning the primary heat

exchanger

1 Takeoffthefrontofthecase.

2 Take off the removable front of the sealed

chamberand the front panel of the combustion
chamber.

If you notice dirt on the fins of the primary heat ex­changer (36 on page 9):

3 cover the sloping surfaces of the burner (33 on

page 9) entirely in a protective layer (sheets of
newspaper or similar).

4 Brush out the primary heat exchanger (36 on

page 9) with a bristle paintbrush.

9.6 Checking the pressurisation

in the exp ansion vessel

Empty the central heating system as described in
section 9.3 of this chapter and check that the pres­sure in the expansion vessel is not less than 1 bar.
See also section 4.4 page 11 of this manual.

If the pressure is lower, take steps to correct the
pressure level.

9.7 Cleaning the burner

The sloping and multi--- gas type burner (33 on
page 9) does not need special maintenance, but
it is sufficient to dust it with a bristle paintbrush.

To reach the burner:

1 Takeoffthefrontofthecase.

2 Take off the removable front of the sealed

chamberand the front panel of the combustion
chamber.

3 Brush out the burner with a bristle paintbrush.

9.8 Checking the flue

Have the integrity of the flue outlet pipe (40 on
page 10) air intake pipe (41 on page 10), checked
periodically, the air pressure sensor* (16 on page

9) and the efficiency of the flue safety circuit
checked at least once a year.

* For details see the section Fan and air pressure
sensor in the service manual.

For all the above maintenance operations it is ad­visable to call an approved Service Engineer.

9.9 Drain pipe inspection

Check the soundness and integrity of the conden­sate drain pipe.

Verify the cleaness and correct filling of the con­densate traps.

9.10 Visual inspection of

appliance

Visually inspect all water joints, seals and connec­tions for any evidence of leakage and retighten,
grease or replace them as necessary.

9.11 Gas pressures and tightness

Check appliance for gas tightness.Recheckoper­ational pressures and adjust as necessary as de­scribed in section 7.6 page 31 of this manual.

MAINTENANCE

37

*1796215520*

03/12

2008

N

17962.1552.0 4908 44A5 UK

Biasi UK Ltd
Newman Park, Western Way
Wednesbury, WS10 7BJ
Sales Tel No: 0121 506 1340
Sales Fax No: 0121 506 1360
Service Tel No: 0121 506 1350
Service Fax No: 0121 506 1370
www.biasi.co.uk