biasi M90E.24S, M90E.28S, M90E.32S User guide

User manual and
Installation instructions

RIVA COMPACT

Models:

M90E.24S
M90E.28S
M90E.32S

Congratulations on your choice.
Your boiler is electronically controll e d and has electronic ignition.
The materials it is made of and the control systems it is equipped with give you safety, a high

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

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,youaread-

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

--- i s g a s --- t i g ht ;

---isofthecorrectgaugefortheflowtothe

boiler;

---is fitted with all the safety and control de-

vices required by the current Regulations;

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.

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 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 Your 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 condi­tions.

Safe handling of

substances

Biasi 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 maybe considered a hazard to
health.

Combustion chamber panels

Material: mineral fibers

Known hazards --- Some p eople 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 le-

vels are only likely to arise following harsh ab­rasion. In general, normal handling and use will
not p resent high risk, follow good hygiene prac­tices,wash handsbefore, 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) Irealnd (IE)

This appliance conforms with the EEC directive90/396 and, consequently, it hasthe rightto makeuse
of the brand name

Moreover,the appliance conforms with the EEC directive 87/308 relative to the prevention and elimina­tion of radio disturbances.

The appliance is built to complywith the regulationnow in force regarding gas appliance’s safety and
the European regulation now in force relative to safety of household and similar electrical appliances.

The manufacturer, in the continuous pocess to improve his products, reserves the 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 b e 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 fillingthe 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 You 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 1..........

1.1 Overview 1......................

1.2 Control panel 1..................

1.3 Isolation valves 1.................

USE

1.4 Technical data 1.................

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

2.1 Warnings 2......................

2.2 Refilling procedure 2..............

2.3 Ignition 3........................

2.4 C.h. circuit temperature 3..........

4 Technical information 11..........

4.1 Overview 11......................

4.2 Main diagram 12..................

4.3 Hydraulic specifications 13.........

4.4 Expansion vessel 13...............

4.5 Technical data M90E.24S 14........

4.6 Technical data M90E.28S 16........

4.7 Technical data M90E.32S 18........

INSTALLATIONMAINTENANCE

5 General requirements 20..........

5.1 Related documents 20.............

5.2 Location of appliance 20...........

5.3 Flue system 20....................

5.4 Gas supply 21....................

5.5 Air supply 21.....................

5.6 Ventilation 21.....................

5.7 Water circulation (c.h.) 21...........

5.8 Domestic water 22.................

5.9 Water treatment 22................

5.10 Electrical supply 22................

6 Installation 24....................

6.1 Warnings 24......................

6.2 Precautions for installation 24.......

2.5 D.h.w. temperature 4..............

2.6 Extinguishing 4..................

2.7 Built in time switch A 5............

2.8 Built in time switch B 7............

3Usefuladvice 9.................

3.1 Central heating 9.................

3.2 Frost protection 9................

3.3 Periodic maintenance 9...........

3.4 External cleaning 9...............

3.5 Operational faults 9...............

6.3 Installing the bracket 24............

6.4 O verall dimensions 25.............

6.5 Joints 25.........................

6.6 Mounting the boiler 25.............

6.7 Fitting the flue system 26...........

6.8 Flue restrictors 26.................

6.9 Choice of flue 26..................

6.10 Electrical connections 28...........

6.11 External frost protection 30.........

7 Commissioning 31...............

7.1 Electrical installation 31............

7.2 Gas supply installation 31..........

7.3 Filling the d.h.w. system 31.........

7.4 Initial filling of the system 31........

7.5 Lighting the boiler 32..............

7.6 C hecking the gas pressure

at the burner 32...................

7.7 Adjusting the burner ignition 33.....

7.8 Adjustment of useful c.h. output 34..

7.9 C hecking the ignition device 36.....

7.10 Checking the flue system 36........

7.11 Instructing the user 36.............

8 Gas conversion 37...............

8.1 Warnings 37......................

8.2 Procedures 37....................

9 Maintenance 39..................

9.1 Warnings 39......................

9.2 Dismantling the external panels 39...

9.3 Emptying the d.h.w. system 39......

9.4 Emptying the c.h. system 39........

Abbreviations used in the manual
C.h. = Central heating
D.h.w. = Domestic hot water
D.c.w . = Domestic cold water

9.5 Combustion analysis check 40......

9.6 Cleaning the primary

heat exchanger 40................

9.7 Checking the pressurisation

in the expansion vessel 41..........

9.8 Cleaning the burner 41.............

9.9 C hecking the flue 41...............

9.10 Visual inspection of appliance 41....

9.11 Gas pressures and soundness 41...

1 APPLIANCE DESCRIPTION

1.1 Overview

1

2

3

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 Time switch (c.h. control)

6 Lock---out signal lamp

7 Lockout reset button

8 Function selector and c.h. temperature control

knob

9 D.h.w. temperature control knob

10 Appliance operation light

1.3 Isolation valves

13 1115 1214

Fig. 1.2 (bottom view of the boiler)

11 C.h. return valve

12 D.c.w. inlet valve

13 Gas inlet valve

14 D.h.w. outlet pipe

15 C.h. flow valve

1.4 Technical data

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

USE

10 89 7 6 45

Fig. 1.3

1

2 INSTRUCTIONS FOR USE

2.1 Warnings

Biasi UK Ltd support the Benchmark initiat­ive. T he 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

USE

future reference by other visiting En­gineers. Also included is the Service Inter­valRecordcardthatshouldbecompleted
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 In ­staller or an Approved Engineer.

This appliance is provided with a built in anti--­freeze system that operates the boiler when
the temperature is below 4 ˚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
giveninsection2.6onpage4.

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 wa ter inl et)

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 fillingpro­cess 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 pressuregauge is set at the
required pressure.

Control valve

4

Normal filling
pressure

2

Instructions for use

2.3 Ignition

1 C heck 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 10 (Fig. 2.4) will
flash every 4 seconds (stand---by condition).

3 If theboiler is to be used for c.h. and d.h.wposi-

tion the function selector 8 as in Fig. 2.4.
The appliance operation light 10 will flash
every 2 seconds (operating boiler).

810

2.4 C.h. circuit temperature

The output temperature of c.h. water is adjustable
from a minimum of about 38°C to a maximum of
about 85°C (Fig. 2.6), by turning the function se­lector (8).

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.

Adjustment of the boiler temperature alters the
gas flow at the burner according to the thermal de­mand in the system. Soit isusual tosee the burner
lit at the minimum level for more or less long
periods.

Minimum

Maximum

USE

Fig. 2.4

4 If d.h.w. supply only is required, position the

function selector 8 as in Fig. 2.5.
The appliance operation light 10 will flash
every 2 seconds (operating boiler).

810

Fig. 2.5

Fig. 2.6

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

Fig. 2.7

Between

--- 5 a n d + 5 ˚C

Lower than

--- 5 ˚C

3

Instructions for use

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 1) will allow you to check that the set tem­perature is obtained.

USE

2.5 D.h.w. temperature

The temperature of the d.h.w. leaving the boiler
can be varied from a minimum of about 35°Ctoa
maximum of about 55°C (Fig. 2.8), by turning the
temperature control knob 9.

Minimum

Maximum

Fig. 2.8

Adjustment of the d.h.w. temperature is complete­ly separate from that of the c.h. circuit.

The adjustment system integrated within the
boiler automatically controls the flow of gas to the
burner in order to keep the temperature of d.h.w.
delivered constant, between the limits of maxi­mum and minimum output.

Where the demand isat a low levelor withthe tem­perature set to the minimum, it is normal to see a
cycle of lighting and extinguishing of the burner
when running.

Adjustment

It is advisable to adjust the d.h.w. temperature to
a level commensurate with the demand, minimis­ing the need to mix with cold water. In this way, the
automatic control facilities will be fully exploited.

Moreover, where the amount of limescale present
in the water may be particularly great, not exceed­ing the position in Fig. 2.9 of the d.h.w. tempera­ture control knob 9 corresponding to about 50°C

(Fig. 2.9), minimisesannoying incidences of scale
deposits and clogging.

Fig. 2.9

In these cases, however, it is advisable to install a
small water treatment device or softener. With
such a device you should avoid periodic descal­ing.

Consequently, the d.h.w.heat exchanger willkeep
its performance consistent for a longer period of
time with resulting gas savings.

9

If the demand for d.h.w. is so great as to prevent
reachinga high enough temperature, have the ap­propriate output limiting valve installed by your in­staller or an Authorised Service Engineer.

2.6 Extinguishing

To turn the boiler off set the function selector 8 to
the position shown in Fig. 2.10.
The appliance operation light 10 will flash every 4
seconds.

Fig. 2.10

When you do not expectto 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 13 and the valves

for the water circuits fitted under the boiler
(Fig. 2.11).

9

810

4

Instructions for use

3 Empty the water circuits, if necessary, as

shownintheinstallation instructions in the sec-
tion maintenance.

13

Fig. 2.11

Closed position

2.7 Built in time switch A

The combi boilers are equipped with a built inelec­tronic time switch (5, Fig. 1.3 on page 1) which
controls the c.h. operation.

G

H

A

Setting the current time

Note: with a new unit or when the reset button B
has been pressed and the selector switch A is to

the

position, the time display G is flashing.

Set the mode selector switch A to the
and press the buttons D or E until the current time
appears in the display G.

The clock starts by moving the switch A to the
AUTO position.

Setting example shown in Fig. 2.13:
Current time 16.30.

Fig. 2.13

Setting the switching time

20 memory locationsare available, corresponding
to 10 on--- off sequences.

Set the mode selector switch A to the C1 position.
The symbols shown in Fig. 2.14 appears in the
display.

position

A

A

USE

Fig. 2.12

Display and control panel

A Mode selector switch

B Reset button

C Enter button

D Increase “+” setting button

E Decrease “ --- ” setting button

F O n --- o f f b u t t o n

G Time display

H O N --- O F F d i s p la y

Fig. 2.14

Press the buttons D or E to set the desired O N

BCDEF

time.

Press the “enter” button C to confirm the setting
and to continue programming the OFF time.

SettheOFFtimeasexplainedabovefortheON
setting and confirm by pressing the “enter” button
C. Proceed in the same way for other settings.

Setting example shown in Fig. 2.15:
A --- ON time 7.45.
B --- OFF time 10.30.

5

Instructions for use

AB

Fig. 2.15

USE

Activating the timed settings

Set the mode selector switch A to the AUTO posi­tion shown in Fig. 2.16.

The current time appears in the display. The ON--­OFF display H indicates the current state of oper­ation (according to the settings).

Fig. 2.16

Note: when the mode selector switch A is in the
AUTO position and the boiler is switched off at the
fused spur isolation switch, the display H indicates
only the OFF state. The other indications are
blanked.

Reading the timed settings

Set the mode selector switch A to the C1 position.
The symbols shown in Fig. 2.14 appears in the
display.

Press the “enter” button C. Each time the button
is pressed the display shows the details of the next
setting.

Changing or deleting the timed settings

Set the mode selector switch A to the C1 position.
The symbols shown in Fig. 2.14 appears in the
display.

Press the “enter” button C until the d isplay shows
the setting to be modified or deleted.

Thetimesettingcanbemodifiednowbypressing
button D or E and the operation can be switched
on or off by pressing the button F.

To delete a time set press the button D or E until the
symbols shown in Fig. 2.14 appears in the time
display G.

The new settigs are memorized by moving the
switch A to a different position.

Manual operation

The operation of the time switch can be forced on
or off constantly or for a timed period.

6

To f or ce constantly on or off the timer operation
set the mode selector switch A to the TIMER posi-
tion. The symbols shown in Fig. 2.17 appears on
the display.

Fig. 2.17

The operation can be switched permanently on or
off by pressing the button F and leaving the switch

A

AintheTIMER position.

To for c e atimeddelayon or off operation, set the
mode selector switch A in the TIMER position.

Set the time delay by pressing the button D or E
and the operation can be forced on or off by pres­sing the button F.

Thetimedelaycanbesetwithinthefollowing
ranges:

1to23hourswithstepsof1hour
1to27dayswithstepsof1day

The time delay setting is activated by moving the
switch A to the AUTO position.
The ON --- OFF display H flashes indicating that the
current state of operation has been forced.

To delete the timed delay setting, set the mode se­lector switch A in the TIMER position, press the
button D or E until the symbols shown in Fig. 2.17
appears in the display and then set the mode se­lector switch A to the AUTO position

Setting example shown in Fig. 2.18:
forced ON state for 4 hours.

Fig. 2.18

Resetting

To completely reset the timer, press the reset but­ton with a pointed object (pencil).

CAUTION: pushing the reset button will complete­ly erase the settings as well as all the data, includ­ing the current time.

Instructions for use

2.8 Built in time switch B

The combi boilers are equipped with a built inelec­tronic time switch which controls the c.h. oper­ation.

H

Fig. 2.19

Display and control panel

A Mode selector switch

B Reset button

C OK button

D Increase “+” setting button

E Decrease “ --- ” setting button

F O n --- o f f b u t t o n

G Time display

H O N --- O F F d i s p la y

Setting the current time

Press repeatedly the button A until the display
shows the symbol

Press the buttons D or E until the current time ap­pears in the display G.

The clock starts by pressing the button A to show
the symbol AUTO.

Setting example shown in Fig. 2.20:
Current time 16.30, day Thursday.

G

A

BCD EF

Setting the switching time

28 memory locationsare available, corresponding
to 14 on--- off sequences.

Press repeatedly the button A until the display
shows the symbol C1 (Fig. 2.21)

The symbols shown in Fig. 2.21 appears in the
display.

A

Fig. 2.21

Press the buttons D or E to set the desired O N
time.

Press the “OK” button C to confirm the setting and
to continue programming the OFF time.

SettheOFFtimeasexplainedabovefortheON
setting and confirm by pressing the “enter” button
C. Proceed in the same way for other settings.

Setting example shown in Fig. 2.22:
A --- ON time 7.45.
B --- OFF time 10.30.

AB

Fig. 2.22

Activating the timed settings

The current time appears in the display. The ON --­OFF display H indicates the current state of oper­ation (according to the settings).

A

USE

Fig. 2.20

Fig. 2.23

Note: when the display shows the symbol AUTO

A

and the boiler is switched off at the fused spur
isolation switch, the display H indicates only the
OFF state. The other indications are blanked.

Reading the timed settings

7

Instructions for use

Press repeatedly the button A until the display
shows the symbol C1 (Fig. 2.21)

The symbols shown in Fig. 2.21 appears in the
display.

Press the “OK” button C. Each time the button is
pressed the display shows the details of the next

USE

setting.

Changing or deleting the timed settings

Press repeatedly the button A until the display
shows the symbol C1 (Fig. 2.21)

The symbols shown in Fig. 2.21 appears in the
display.

Press the “OK” button C until the display shows
the setting to be modified or deleted.

Thetimesettingcanbemodifiednowbypressing
button D or E and the operation can be switched
on or off by pressing the button F.

To delete a time set press the button D or E until the
symbols shown in Fig. 2.21 appears in the time
display G.

The new settings are memorised by pressing the
button A.

Manual operation

The operation of the time switch can be forced on
or off constantly or for a timed period.

To f or ce constantly on or off the timer operation
press repeatedly the button A until the display
shows the symbol TIMER. The symbols shown in
Fig. 2.24 appears on the display.

To f o rc e atimeddelayon or off operation, press
repeatedly the button A until the display shows the
symbol TIMER.

Set the time delay by pressing the button D or E
and the operation can be forced on or off by pres­sing the button F.

Thetimedelaycanbesetwithinthefollowing
ranges:

1to23hourswithstepsof1hour
1to27dayswithstepsof1day

Pressthe button A until the display shows thesym­bol AUTO.
The ON --- OFF display H flashes indicating that the
current state of operation has been forced.

To delete the timed delay setting, press repeatedly
the button A until the display shows the symbol
TIMER, press the button D or E until the symbols
showninFig.2.25appearsinthedisplayandthen
pressthe button A until the displayshows thesym­bol AUTO.

Setting example shown in Fig. 2.25:
forced ON state for 4 hours.

A

Fig. 2.25

A

Fig. 2.24

The operation can be switched permanently on or
off by pressing the button F and leaving the dis­play shows the symbol TIMER.

8

Note:If during manual operation, power supply
turns off, timer must be set again following previ­ous steps

Resetting

To completely reset the timer, press the reset but­ton with a pointed object (pencil).
CAUTION: pushing the reset button will complete­ly erase the settings as well as all the data, includ­ing the current time.

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 (8 in Fig. 3.1).

8

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 4 ˚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 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;

--- d omestic hot water 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.

3.4 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 n ot 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.).

3.5 Operational faults

If the lock---out signal lamp comes on

this indicates that the safety lock --- out 6 (Fig. 3.2)
has stopped the boiler

To re --- start the boiler, it is necessary to press the
boiler reset button 7 (Fig. 3.2).

6

7

Fig. 3.2

Forthe firstlighting up and following maintenance
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.

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

you should check that the p ressure on the tem­perature and pressure gauge (Fig. 2.2 on page 2)
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 theradiators, ifnecessary.

If the pressure on the temperature and pres­suregauge(4onpage1)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 thismanual.

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

USE

9

Useful advice

If water comes out of the pressure relief valve

Check on the temperature and pressure gauge (4
on page 1) 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.

USE

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 in time, a reduction in domestic hot water
supply is observed...

The likely causes may be impurities caught in the
domestic hot water flow switch filter or limescale
deposited in the domestic hot water heat ex­changer. It is advisable to have the app liance
cleaned out by an Authorised Service Centre En­gineer.

If water should occasionally leak from the
boiler...

shut off the valves positioned under the boiler
(Fig. 2.11 on page 5) and call an Authorised Ser­vice Centre Engineer.

If the appliance operation light 10 (Fig. 3.3)
flashes very quickly the boiler is faulty.

10

Fig. 3.3

In this case or in case of problems other than
those mentioned here, switch off the boiler, as
describedinsection2.6onpage4andcalla
competent and responsible service engineer.

10

4 TECHNICAL INFORMATION

4.1 Overview

32

31

30

29

28

27

26

Fig. 4.1

11 C.h. return valve
12 Domestic cold water inlet valve

33

25 1822

24

21

34

2023

35

19 16

17

13 Gas inlet valve
14 D.h.w. outlet pipe
15 C.h. flow valve
16 D.h.w. temperature probe NTC

17 Main circuit drain valve

18 C.h. pressure relief valve

19 Pump

20 Pump vent plug

21 Automatic air purger valve

22 D.h.w. flow switch

23 Modulation gas valve

24 Primary circuit flow switch

25 C.h. temperature probe NTC

2 6 T h r e e --- w a y d i v e r t e r v a l v e

27 Flame --- detecting electrode

28 Ignition electrodes

29 Burner

30 Combustion chamber

31 Primary heat exchanger

32 Air pressure switch

33 Air switch pressure test points

34 Fan

35 Safety thermostat

36 Modulation operator

37 Gas valve outlet pressure test point

38 Gas valve inlet pressure test point

39 D.h.w. heat exchanger

40 C.h. expansion tank

4 1 B y --- p a s s v a l v e

42 Venturi device

43 Domestic water circuit filter

44 D.h.w. flow limiter

45 Flue outlet pipe

46 Air intake pipe

INSTALLATION

11

Technical information

4.2 Main diagram

21

46

16

24

35

19

45

26

39

25

44
43

22

42

32

31

INSTALLATION

28

27

37

36

23

38

34

29

40

Fig. 4.2

12

13

18

11

41

15

17

12

14

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 (41 on page 11), 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 sys-

tem component cocks, the by--- pass valve ensur­es a minimum flow of water through the primary
heat exchanger.

4.4 Expansion vessel

Note:thisboilerisdesignedforoperationonly
in a sealed central heating system

The height difference between the pressure relief
valve and the highest point in the system may be
7m at most.

For greater differences, increase the pre--- load
pressure in the expansion vessel (40 on page 11)
and the system, when cold, by 0.1 bar for each
additional 1m.

Capacity

P r e --- lo a d p r e s s u r e kPa

Maximum volume of water
in the system *

Tab . 4. 1

* Where conditions are:

--- Averag e maximum temperature of the system

is 80°C

--- Initial temperature when filling up the system is

10°C

For systems with volumes greater than 104l, an
additional expansion vessel must be provided.

l 6,0

100

bar

1,0

l 104

INSTALLATION

13

Technical information

4.5 Technical data M90E.24S

Nominal heat input kW

Minimum heat input kW

Maximum useful output kW

Minimum useful output kW

Central heating

Maximum temperature ˚C 85
Minimum temperature ˚C 38

Maximum pressure kPa

INSTALLATION

Minimum pressure kPa

Available head
(in 1000 l/h)

Domestic hot water

Maximum temperature ˚C 55

Minimum temperature ˚C 35

Maximum pressure kPa

Minimum pressure kPa

Flow rate

minimum l/min 2,5
30˚ rise l/min 11,6*

35˚ rise l/min 10,0*
40˚ rise l/min 8,7*

BTU/h

BTU/h

BTU/h

BTU/h

bar

bar

kPa

bar

bar

bar

26,6

90 754

11,0

37 530

24,3

82 906

9,1

31 047

250

2,5

30

0,3

27

0,27

1 000

30

0,3

Injectors

Natural G20 130

Butane G30 77

Propane G31 77

Gas supply pressures

Gas norm. min max

Natural
G20

Butane
G30

Propane
G31

Pa

mbar

Pa

mbar

Pa

mbar

2 000201 700172 500

25

2 900292 000203 500

35

3 700372 500254 500

45

Gaspressuresattheburner

Gas min max Ignition

Natural
G20

Butane
G30

Propane
G31

10

Gas rate

Gas min max

Natural

Pa

mbar

Pa

mbar

Pa

mbar

180

1,8

500

5,0

610

6,1

1 170

11,7

2 760

27,6

3 570

35,7

600

6,0

1 200

1 300

m3/h 1,16 2,82

12

13

G20

Butane

kg/h 0,87 2,09

G30

Propane

kg/h 0,85 2,06

G31

* calculated values subject to tolerance
Net calorific value at 15 ˚C and 1013,25 mbar

G 20 34,02 MJ/m

3

G 30 45,6 MJ/kg
G 31 46,4 MJ/kg
1 mbar approximately equals 10 mm H

O

2

14

Technical information

Electrical Data

Voltage V~ 230

Frequency Hz 50

Power consumption W 150

Protection degree IPX4D

External fuse rating A 3

Internal fuse rating A 1,6 T

Flue design

Flue pipe diameter

Coaxial mm 60/100

Twin split pipes mm 80

Roof mm 80/125

Nominal heat flow rate** kW 26,6
Exhaust temperature** ˚C 145

Smoke production** kg/h 55,1

Flue gas figures

Nominal heat input** kW 26.6

CO2content % 7,0

O2content % 8,4

CO content ppm 150

Exhaust temperature** ˚C 145

INSTALLATION

Other specifications

Height mm 703

Width mm 400

Depth mm 325

Weight (dry) kg 37

Water volume in the boler
(up to 1 bar)

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

l(kg) 1,0

15

Technical information

4.6 Technical data M90E.28S

Nominal heat input kW

Minimum heat input kW

Maximum useful output kW

Minimum useful output kW

Central heating

Maximum temperature ˚C 85
Minimum temperature ˚C 38

Maximum pressure kPa

INSTALLATION

Minimum pressure kPa

Available head
(in 1000 l/h)

Domestic hot water

Maximum temperature ˚C 55

Minimum temperature ˚C 35

Maximum pressure kPa

Minimum pressure kPa

Flow rate

minimum l/min 2,5
30˚ rise l/min 13,6*
35˚ rise l/min 11,6*

40˚ rise l/min 10,2*

BTU/h

BTU/h

BTU/h

BTU/h

bar

bar

kPa

bar

bar

bar

31,1

106 107

13,0

44 353

28,4

96 895

10,8

36 847

250

2,5

30

0,3

27

0,27

1 000

30

0,3

Injectors

Natural G20 130

Butane G30 77

Propane G31 77

Gas supply pressures

Gas norm. min max

Natural
G20

Butane
G30

Propane
G31

Pa

mbar

Pa

mbar

Pa

mbar

2 000201 700172 500

25

2 900292 000203 500

35

3 700372 500254 500

45

Gaspressuresattheburner

Gas min max Ignition

Natural
G20

Butane
G30

Propane
G31

10

Gas rate

Pa

mbar

Pa

mbar

Pa

mbar

180

1,8

450

4,5

570

5,7

1 170

11,7

2 760

27,6

3 570

35,7

600

6,0

1 200

12

1 300

13

Gas min max

Natural

m3/h 1,37 3,29

G20

Butane

kg/h 1,02 2,45

G30

Propane

kg/h 1,00 2,41

G31

* calculated values subject to tolerance

For the net calorific values of G20, G30, G31 see the technical data at page 14

1 mbar approximately equals 10 mm H

O

2

16

Technical information

Electrical Data

Voltage V~ 230

Frequency Hz 50

Power consumption W 170

Protection degree IPX4D

External fuse rating A 3

Internal fuse rating A 1,6 T

Flue design

Flue pipe diameter

Coaxial mm 60/100

Twin split pipes mm 80

Roof mm 80/125

Nominal heat flow rate** kW 31,1

Exhaust temperature** ˚C 165

Smoke production** kg/h 70,6

Flue gas figures

Nominal heat input** kW 31,1

CO2content % 6,3

O2content % 9,7

CO content ppm <100
Exhaust temperature** ˚C 165

INSTALLATION

Other specifications

Height mm 703

Width mm 400

Depth mm 325

Weight (dry) kg 39

Water volume in the boler
(up to 1 bar)

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

l(kg) 1,1

17

Technical information

4.7 Technical data M90E.32S

Nominal heat input kW

Minimum heat input kW

Maximum useful output kW

Minimum useful output kW

Central heating

Maximum temperature ˚C 85
Minimum temperature ˚C 38

Maximum pressure kPa

INSTALLATION

Minimum pressure kPa

Available head
(in 1000 l/h)

Domestic hot water

Maximum temperature ˚C 55

Minimum temperature ˚C 35

Maximum pressure kPa

Minimum pressure kPa

Flow rate

minimum l/min 2,5
30˚ rise l/min 15,3*
35˚ rise l/min 13,1*

40˚ rise l/min 11,5*

Injectors

Natural G20 130

Butane G30 77

Propane G31 77

BTU/h

BTU/h

BTU/h

BTU/h

bar

bar

kPa

bar

bar

bar

35,2

120 102

15,5

52 886

32,0

109 184

12,7

43 435

250

2,5

30

0,3

27

0,27

1 000

30

0,3

Gas supply pressures

Gas norm. min max

Natural
G20

Butane
G30

Propane
G31

Pa

mbar

Pa

mbar

Pa

mbar

2 000201 700172 500

25

2 900292 000203 500

35

3 700372 500254 500

45

Gaspressuresattheburner

Gas min max Ignition

Natural
G20

Butane
G30

Propane
G31

Pa

mbar

Pa

mbar

Pa

mbar

180

1,8

500

5,0

670

6,7

1 170

11,7

2 760

27,6

3 570

35,7

600

6,0

1 200

12

1 300

13

Gas rate

Gas min max

Natural

m3/h 1,64 3,73

G20

10

Butane
G30

Propane

kg/h 1,22 2,78

kg/h 1,20 2,73

G31

Electrical Data

Voltage V~ 230

Frequency Hz 50

Power consumption W 180

Protection degree IPX4D

External fuse rating A 3

Internal fuse rating A 1,6 T

* calculated values subject to tolerance

For the net calorific values of G20, G30, G31 see the technical data at page 14

1 mbar approximately equals 10 mm H

O

2

18

Technical information

Flue design

Flue pipe diameter

Coaxial mm 60/100

Twin split pipes mm 80

Roof mm 80/125

Nominal heat flow rate** kW 35,2

Exhaust temperature** ˚C 155

Smoke production** kg/h 90

Flue gas figures

Nominal heat input** kW 35,2

CO2content % 6,5

O2content % 9,3

CO content ppm 200

Exhaust temperature** ˚C 155

Other specifications

Height mm 703

Width mm 400

Depth mm 325

Weight (dry) kg 39

Water volume in the boler
(up to 1 bar)

l(kg) 1,1

INSTALLATION

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

19

5 GENERAL REQUIREMENTS

Biasi UK Ltd support the Benchmark initiative.
The BenchmarkLog Book is located at theback
of this manual and should be completed by the
Installing/Commisssioning Engineer and
handed over to the User for future reference by
other visiting Engineers. Also included is the
Service Interval R ecord 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 & U se) Regulations.

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) Regulation. 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.

cal 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 thatthe flue ter-

minal 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 with due 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 effectof
such ”steaming” must be considered.

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

5.2 Location of appliance

The appliance may be installed in any room or in­ternal space, although particular attention is
drawn tothe 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 installed in
a room containing a bath or shower, any electri-

20

Fig. 5.1

BC

F

D

IJ

K

rev . 17.09.93

N

A

E

G

H

O

LM

G

General requirements

Ter minal po s i tio n mm

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 or car port roof 200*. ..........

E From vertical drain pipes and soil pipes 75. .....

F From internal corners 150*. ...................

G From external corners 75*. ....................

H Above ground or balcony level 300. ............

I From a surface facing a terminal 600.. ...........

J From a terminal facing a terminal 1 200. .........

K From an opening in the car port.

(e.g.door,window)intodwelling 1200.........

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

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

Above the roof pitch with roof slope

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

O From wall face 600. ..........................

* specific manufacturer requirements

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

Pipework must be of adequate size. Pipes of a
smaller size than the boiler inlet connection should
not be used.

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

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

5.7 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

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 roofsand 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 500--- 600 lts/hr through the main heat ex­changer.

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

5.5 Air supply

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

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

Air release points

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 storedarticles be al­lowed to come into contact with the boiler or flue
pipe.

Thesemustbefittedatallhighpointswhereairwill
natural collect and must be sited to facilitate com­pletefillingofthesystem.

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 13 for its technical data.

INSTALLATION

rev . 17.09.93

21

General requirements

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.

Mains water feed: hot water supply

The domestic section of the boiler is designed to
withstand an internal domestic water pressure of
10 bar. Where it is likely that the mains domestic
water pressure may exceed 5 bar, it is possible
due to internal “water hammer” effects that the
pressure within the domestic system can increase
to a level in excess of the 10 bar limit.

In these circumstances it is therefore recom-

INSTALLATION

mended that a 3 bar pressure reducing valve be
fitted to the incoming mains water supply and a
mini expansion vessel installed on the domestic
circuit.

These devices will protect the boiler and the do­mestic system from damage due to excessive do­mestic water pressure.

Filling

A method for initially filling the system and replac­ing water lost during servicing must be provided
and itmust comply withlocal water authority regu­lations.

The correct method is shown in Fig. 5.2.

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 wa ter inl et)

C.h. return pipe

Control valve

Fig. 5.2

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.

5.8 Domestic water

The domestic water installation must be in accord­ance with the relevant recommendations of BS

5546. Copper tubing to BS EN 1057 is recom­mended for water carrying pipework and must be
use for pipework carrying potable water.

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

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 7.4 of this manual.

Domestichotwatercircuit(scaleprotection)

In areas where the water is ’hard’ (i.e. more than
200 ppm total hardness as defined by BS 7593:
1993 Table 2) it is recommended that a proprietary
scale---reducing device is fitted into the boiler cold
supply, within the requirements of the local water
company.

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 tu 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
appliancebytheuseofafuseddoublepoleisola­tor having a contact separation of at least 3 mm
between poles or alternatively, by the use of a 3A

22

rev . 17.09.93

General requirements

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 appliance isinstalled in

a bathroom this must then be sited outside the
bathroom.

INSTALLATION

rev . 17.09.93

23

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, sincethey are inte­gral parts of the boiler.

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

The safety relief valve must be connected to a
suitable drain, or discharge in a safe manner.

The electrical wiring must conformwith current

INSTALLATION

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 6.10 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 --- f reeze (neutralised) to
the c.h. system.

--- Before installing the boiler on an existing c.h.
system,flush it out thoroughly beforefitting 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 leafletincluded with the
flue kit, packed separately).

24

Installation

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.

6.4 Overall dimensions

C

95

35 165

193

20

101

85 255

20

561

D.h.w.

outlet*

C.h.

flow

83

* not present on c.h. only boilers

A --- a i r i n ta k e / f l ue o u t l e t p i p e ø 1 0 0 (c o --- a x i a l )
B --- flue outlet pipe ø 80 (twin kit)
C --- air intake pipe ø 80 mm (twin kit)

Gas

inlet *

400

250

mounting

bracket

Cold

water

65645265

Wall

return

B

A

703

C.h.

Fig. 6.2 (all dimensions in mm)

147

237

AandB

325

C

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.

6 Repeat the above procedure for the d.c.w. inlet

utilising the ½” cold water inletvalve E,the ø 15
mm copper tail F with its connection nut and
two ½” gaskets.

7 Fix the ø 15 mm copper tail G with the ½” con-

nection nut and a ½” gasket.

8 Connect the pipe H (Fig. 6.4) from the pres-

sure relief valve to the safety discharge pipe­work.

C

G

A

B

E

A

Fig. 6.3

D

F

C

INSTALLATION

6.5 Joints

Functions Pipe sizes

Gas, c.h. return, c.h. flow ø22

D.c.w. inlet ø15

D.h.w. outlet ø15

Pressure relief valve ø15

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

H

Fig. 6.4

25

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.

6.8 Flue restrictors

Two restrictors with different size are supplied
with the boilers M90E.24S and M90E.28S.
A 44 mm size is fitted to the boiler and a 47 mm
size is supplied in a separate bag.

Two restrictors with different size are supplied
with the boiler M90E.32S.
A 47 mm size is fitted to the boiler and a 50 mm
size is supplied in a separate bag.

Thesizeismarkedontherestrictorbody.

INSTALLATION

For the correct use of the restrictors w i t h c o --- a x i a l
pipes ø 60/100 mm refer to:

Tab. 6.2 for models M90E.24S and M90E.28S
Tab. 6.3 for model M90E.32S

For the correct use of the restrictors with vertical
roof kit ø 80/125 mm refer to:
Tab. 6.4 for models M90E.24S, M90E.28S
Tab. 6.5 for the model M90E.32S

For the correct use of the restrictors with twin
pipes refer to Fig. 6.8 for the models M90E.24S;
and M90E.28S, refer to Fig. 6.9 for the model
M90E.32S.

Models M90E.24S, M90E.28S

Equivalent length (ø 80/125) Restrictor

Between 0,5 and 1,5 m ø44mm

More than 1,5 m up to 6,5 m ø47mm

More than 6,5 m up to 8,5 m no restrictor

Tab . 6. 4 FOR VERTICAL ROOF KIT

Model M90E.32S

Equivalent length (ø 80/125) Restrictor

Between0,5and4m ø47mm

More than 4 m up to 6 m no restrictor

Tab . 6. 5 FOR VERTICAL ROOF KIT

Theappropriaterestrictor,whennecessary,must
be fitted in the flue outlet elbow as indicated in
Fig. 6.5.

Model M90E.24S, M90E.28S

Equivalent length (ø 60/100) Restrictor

Between0,3and1m ø44mm

More than 1 m up to 2 m ø47mm

More than 2 m up to 3 m no restrictor

Tab . 6. 2 FOR CO--- AXIAL STANDARD FLUE

Model M90E.32S

Equivalent length (ø 60/100) Restrictor

Between0,3and1m ø47mm

More than 1 m up to 2,7 m no restrictor

Tab . 6. 3 FOR CO--- AXIAL STANDARD FLUE

26

Fig. 6.5

6.9 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 3 metres for models
M90E.24S, M90E.28S and 2,7 metres for the
model M90E.32S can be achieved utilising exten­sions. This flue system can only be used to dis-

Installation

charge 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 0,3 m from the boiler.
In all circumstances the flue terminal must dis­charge horizontally and the equivalent flue length
must not exceed 3 metres for models M90E.24S,
M90E.28S and 2,7 metres for the model
M90E.32S.

Elbows 45˚ &90˚ (Fig. 6.6C)

Co-- -axial 60/100mm.

Elbow kits enable the standardflue kits to 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.

B

ø 60/100

See section 6.9

A

ø 60/100

90˚= --- 1 m

45˚= --- 0 , 5 m

C

Fig. 6.6

Twin pipe kits ø 80 mm (Fig. 6.7)

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 gases. Conse­quently it is possible to extend the flue system to
a greater distance than that provided by the stan­dard horizontal co --- axial flue.

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 2,75 m
respectively.

90˚=--- 2,75 m

45˚=--- 0,90 m

Fig. 6.7

The graph in Fig. 6.8 demonstrates the allowable
equivalent lengths for the air supply and flue ex­haust pipes of models M90E.24S and M90E.28S.

Flue exhaust ”a”
32
30
28
26
24
22
20
18
16
14
12
10

Restrictor

8

47 mm

6
4
2
0

02468101214161820222426283032

Allowed values

Restrictor

M90E.24S
M90E.28S

No

Air intake ”b”

Fig. 6.8 (all dimensions in metres)

INSTALLATION

27

Installation

The graph in Fig. 6.9 demonstrates the allowable
equivalent lengths for the air supply and flue ex­haust pipes of model M90E.32S

Flue exhaust ”a”

16
15
14
13
12
11
10

9
8
7
6
5
4
3
2
1
0

012345678910111213141516

INSTALLATION

Restrictor

50 mm

Allowed values

No

Restrictor

Fig. 6.9

Vertical--- roof kit (Fig. 6.10)

This kit allows vertical termination of the flue pipe
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.

M90E.32S

Air intake ”b”

Vertical flue kit --- condensation

When fitting the 80/125 l flue kits where the equiv­alent fluelength exceeds 3 m a condensate collec­tor and syphon are required.

If the appliance normally operates at minimum
output power at very low temperatures (e.g. 40 ˚C
return / 60 ˚C flow), the above equivalent length
should be reduced to 1 m.

The syphon must also be connected to a suitable
drain.

Please, see the boiler accessory leaflet available
from your Supplier for details or contact Biasi UK
Technical Helpline.

6.10 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 I and J (Fig. 6.11).

3 Loosen the screws K.

I

Fig. 6.10

28

See Tab. 6.4 for 24 and 28 kW models)

Max length

See Tab. 6.5 for 32 kW model

J

I

KJ

K

Fig. 6.11

4 Remove the side panels or move the lower part

of the side panels as indicated in Fig. 6.12 and
pull the control panel.
When completely pulled out, the panel can ro­tate 45˚ downwards to facilitate the operations
on the internal p arts.

Installation

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.

When connecting any type of external control,
the link M in Fig. 6.14 must be removed.

To fu se d s p u r
isolation switch

LN

Power supply
terminal block

Fig. 6.12

5 Loosen the screws L and remove the service

panel (Fig. 6.13).

L

Fig. 6.13

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

2

.

6 Connect the electrical supply flexible cord

coming from the fused spur isolation switch to
the power supply terminal block of the boiler
(Fig. 6.14) keeping the same connections for
the live (brown wire) and the neutral (blue
wire). External3 A fuse or fused plug with same
current rating is recommended.

Do not connect live wires to terminals to

M

3

12

External co ntrols
terminal block

Fig. 6.14

8 Connect the room thermostat between ter-

minals 1 and 3 as shown in Fig. 6.15.

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

Room thermostat

Power supply
terminal block

LN

T

External co ntrols
terminal block

3

Fig. 6.15

9 Route the electrical supply flexible cord and

the external control flexible cord as illustrated
in Fig. 6.16.

12

INSTALLATION

29

Installation

Lock the flexible cords in place with the flexible
cord clamps

To th e e x t er n a l
control device

To th e f u s e d s p u r
isolation switch

Fig. 6.16

INSTALLATION

6.11 External frost protection

10 Connect the frost thermostat between ter-

minals 1 and 2 as shown in Fig. 6.17.

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

Frost thermostat

Room thermostat

LN

T

Fig. 6.17

T

Power supply
terminal block

12

External co ntrols

3

terminal block

30

7 COMMISSIONING

Ensure that the Benchmark Log Book is satis­factorily commpleted during the commssion­ing process. The Log Book is located at theend
of this manual. This manual should be handed
to the User following completion of the installa­tion and commissioning process. Failure to
comply with these requirments may invalidate
the manufacturers guarantee.

For Ireland (IE), it is necessary to complete a
“Declaration of Conformity” to indicate com­pliance 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 follo we d as specified in the
service manual.

7.2 Gas supply installation

1 Inspect the entire installation including the gas

meter, test for soundness and purge, all as de­scribed in BS 6891.

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

2 Open the gas cock 13 (Fig. 7.1) on the

appliance and check the gasconnector on the
appliance for leaks.

13 12

Fig. 7.1

Open position

7.3 Filling the d.h.w. system

1 Close all hot water draw---off taps.

2 Open the cold water inlet valve 12 (Fig. 7.1).

3 Slowly open each draw--- off tap and close it

only when clear water, free of bubbles, flows
out.

7.4 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 Unscrew the cap on the automatic air purger-

valve 21 (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.

21

20

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 fromthe pump b y unscrewingthe

pump plug 20 (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 actualreading

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 starting the
boiler for the first time

INSTALLATION

31

Commissioning

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

tems.

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-

INSTALLATION

tion of your boilers guaranteeand willalso pre­vent problems which you may experience in
the future if an inhibitory is not used.

7.5 Lighting the boiler

Some products incorporate an anti cycling time
delay. Itis normal whenfirst switchingthe 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 10 will flash
every 4 seconds.

2 Turn the function selector 8 as in Fig. 7.3. The

appliance operation light 10 will flash every 2
seconds.

810

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 6 will ap­pear.

To reset the boiler press and release the boiler re­set button 7 (Fig. 7.3).

7.6 Checking the gas pressure at

the burner

This boiler has been tested to the highest qual ­ity 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).

2 Loosen the internal screw 37 (Fig. 7.4) on the

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

3 Set the d.h.w. and c.h. temperature control

knobs to their maximum position.

32

Commissioning

4 Switchontheboilerandopenatleastonehot

water tap fully.

5 Check the maximum gas pressure and com-

pare the value on the gauge with the value indi­cated in the sections 4.5, 4.6 or 4.7 (gas
pressures at the burner), accordingly with the
model of boiler installed.

6 Check the maximum gas flow at the gas meter

and compare the value indicated in the sec­tions 4.5, 4.6 or 4.7 (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).

37

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, 4.6 or 4.7 (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 Access the main control panel (see section

6.10, follow steps 2 --- 5)

13 Switch on the boiler.

14 Check the ignition gas pressure by setting

dip --- switch ”3” (NO TAG) to the OFF position.
Compare the value on the gauge with the value
indicated in the sections 4.5, 4.6 or 4.7 (gas
pressures at the burner), accordingly with the
model of boiler installed.
If the ignition gas pressure is not set correctly
see section 7.7 in this manual for the adjust­ment procedure. If ignition gas pressure iscor­rect switch dip - -- switch ”3” to the ON position.

A

15 Switch off the boiler, turn off the hot water tap(s)

and disconnect the pressure gauge.

If the maximum and minimum gas pressures
measuredaboveare notin accordance with the
technicaldata (sections 4.5, 4.6 or 4.7 ) then ad­justment will be necessary. A full explanation
of the gas pressure adjustment procedure is
givenintheGasValvesectionoftheservice
manual.If maximumand/orminimum 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 adjustment devices must be sealed.

7.7 Adjusting the burner ignition

1 Turn off the boiler by means of the fused spur

isolation switch provided adjacent to the ap­pliance.

2 Open the gas valve outlet pressure test point

37 (Fig. 7.4) and connect the gauge.

3 Turn the boiler O N positioning the control se-

lectors 8 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”.

8

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 functionse­lector 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

INSTALLATION

33

Commissioning

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 burner and injectors are clean.

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

(see Section Gas Conversion of this manual)

7 If the ignition pressure recorded is not as indi-

cated in the TechnicalData thenrefer 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.

INSTALLATION

7.8 Adjustment of useful c.h.

output

The following procedure allows the output of the
boiler for central heating to be adjusted to meet
the system requirement. Adjusting the useful cen­tral output does not prevent the b oiler firing at
maximum rate for domestic hot water production.

Refer to Fig. 7.13, Fig. 7.14 and Fig. 7.15 (de­pending on the gas used) and determine the cor­rect burner pressure appertaining to the output
required f or the central heating requirement.

1 Remove the front panel of the case.

2 Loosen the screws B and remove the service

panel (Fig. 7.6).

B

4 Rotate the knob 9 as in Fig. 7.7

5 Turn the boiler ON positioning the function se-

lector 8 as indicated in Fig. 7.7 and ensure that
the timer selector switch and room thermostat,
if fitted, are set to “heat demand”.
Run the boiler in c.h. mode (do not open any
d.h.w. tap).

810

Fig. 7.7

6 Keep pressed the reset button 7 for about 10

secondsuntil thelock--- out signallamp 6 blinks
(Fig. 7.7).

ON

LD1 LD2 LD3

Fig. 7.8

7 The lamps 10 should give the indication as in

Fig. 7.8 - -- Fig. 7.9.
If not, press the reset button 7 (Fig. 7.7) repeat­edly to obtain it.

7 69

10

Fig. 7.6

3 Open the gas valve outlet pressure test point

37 (Fig. 7.4) and connect the gauge.

34

Where: Lamp OFF

Lamp ON

Fig. 7.9

8 Keep pressed the reset button 7 (Fig. 7.7) for

about 5 seconds.
TheboilerrunsinC.hmodeandthelamp6
(Fig. 7.7) is switched OFF.

Commissioning

The lamps 10 give the indication as in Fig. 7.8

--- Fig. 7.10

Where: Lamp OFF

Flashing
lamp, alone
or simulta­neously with
an other
lamp

Fig. 7.10

9 Rotate the knob 9 in Fig. 7.7 to obtain the pres-

sure to the burner to meet with the central heat­ing system requirements. Refer to the
diagrams shown in Fig. 7.13, Fig. 7.14 or
Fig. 7.15
By rotating clockwise the pressure increases.

10 Make a note of the position of the knob 9 and

recorded this in Fig. 7.11 below with an *.

810

Fig. 7.11

11 Keep pressed the reset button 7 for about 10

seconds until the lock--- out signal lamp 6
blinks.

Note: during the adjustment theboiler doesn’t op­erate.

12 Press the reset button 7 repeatedly (2 times)

until the lamps 10 give the indication as in
Fig. 7.8 --- Fig. 7.12 (useful c.h. output adjust­ment mode).

Where: Lamp OFF

Fig. 7.12

13 Set the knob 9 on the position corresponding

to the position obtained on step 9.

7 69

Lamp ON

By turning the knob 9, the lock --- out signal
lamp 6 blinks quickly (2 per second) indicating
that the setting has changed and must b e me­morised by keeping pressed the reset button
7 for about 5 seconds until the lamps 10 all
briefly simultaneously blink.

14 To reset the boiler to the normal operation turn

it OFF and ON by the function selector 8. Inany
case, the boiler automatically resets to its nor­mal operation after 10 minutes.

kW

32
30
28
26
24
22
20
18
16
14
12
10

23456789101112

M90E.24S
M90E.28S

M90E.32S

Fig. 7.13

kW

32
30
28
26
24
22
20
18
16
14
12
10

6 9 12 15 18 21 24 27

M90E.24S
M90E.28S

M90E.32S

Fig. 7.14

Natural (G20)

mbar

Butane (G30)

mbar

INSTALLATION

35

Commissioning

kW

32
30
28
26
24
22
20
18
16
14
12
10

8 111417202326293235

M90E.24S
M90E.28S

M90E.32S

INSTALLATION

Fig. 7.15

Propane (G31)

mbar

7.9 Checking the ignition device

With the burner on high flame close the gas cock.
About 10 seconds after, the lock --- out signal lamp

6(Fig.1.3onpage1)mustappear.
To reset the boiler press and release the boiler

reset button 7 (Fig. 1.3 on page 1).

7.10 Checkingthefluesystem

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

Ensure that the flue terminal is sited correctly in ac­cordance with the flue fitting instructions and
Fig. 5.1 on page 20 of this manual.

To carry out a combustion check refer to the in­structions given in the section 9.5 of this manual.

Reference figures are given in the sections 4.5, 4.6
or 4.7 of this manual (Flue gas figures).

7.11 Instructing the user

Hand over this combined User & Installation man­ual and the Service manual tothe end user and ex­plain how to use the unit in both c.h. and d.h.w.
modes.

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, theappliance must beser­viced by a competent person at least once a year.

36

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 (13 in Fig. 8.1) fitted

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

13

Fig. 8.1

2 Remove the front and side panels of the case

(see the section General access and emptying
hydraulic circuits in the service manual).

3 Takeoffthelidofthesealedchamber.

4 Take the front panel of the combustion

chamber off and remove the burner (29 on
page 11). See section Ignition and detection
electrodes in the service manual for detailed in­structions.

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

placing the burner injectors correctly.

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

combustion chamber and the lid of the sealed
chamber.

7 Extract the control panel as explained in the

section 6.10 of this manual.

Closed position

8 Loosen the screws C and remove the service

panel (Fig. 8.2).

C

Fig. 8.2

9 Switch on the appliance at the mains isolating

spur.

10 Turn the boiler OFF positioning the function se-

lector 8 as indicated in Fig. 8.3

810

Fig. 8.3

11 Disconnect the C.h. temperature probe NTC

25 in Fig. 8.4

25

Fig. 8.4

12 Keep pressed the reset button 7 for about 10

seconds until the lock--- out signal lamp 6
blinks.

13 Connect the C.h. temperature probe NTC 25 in

Fig. 8.4

7 69

MAINTENANCE

37

Gas conversion

ON

LD1 LD2 LD3

10

Fig. 8.5

14 Press the reset button 7(Fig. 8.3) repeatedly (4

times) until the lamps 10 give the indication as
in Fig. 8.5 --- Fig. 8.6 (gas type mode).

Where: Lamp OFF

Lamp ON

Fig. 8.6

At this step it is possible to visualize the current set­ting by keeping the reset button 7 pressed for
more than 5 seconds. The lamps 10 will flash a
number of times corresponding to the setting of
the knob 9 in Fig. 8.7.

Gas type

MAINTENANCE

NATURAL

Fig. 8.7

Gas
supply

Natural
gas

L.P.G. 4 165 mA

Setting No.

GAS

1

Position of
knob 9

1 125 mA

Approx. Max current
through the modulator
device

L.P.G.

4

15 To change the setting turn the knob 9 on a posi-

tion corresponding to the gas used as shown
in Fig. 8.7.
By turning the knob 9, the lock --- out signal
lamp 6 blinks quickly (2 per seconds) indicat­ing that the setting has changed and must be
memorised.

16 To memorize the setting keep pressed the

reset button 7 for about 5 seconds until the
lamps 10 briefly blinks simultaneously.

17 Open the gas cock (13 in Fig. 8.9)

13

Fig. 8.9

18 To reset the boiler to the normal operation turn

it ON by the function selector 8 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)

19 Calibrate the gas valve according to the in-

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

20 Set the correct gas pressure for centralh eating

output required, see section 7.8 in this manual.

21 Stick on the inside of the left hand side panel

9

adjacent to the data badge the self--- adhesive
label (included with the conversion kit) indicat­ing the type of gas, and the gas pressures to
which the appliance has been set.

22 Replace the service panel, the front and side

panels of the case.

Open position

Fig. 8.8

38

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

1 Loosen the two 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).

Fig. 9.2

9.3 Emptying the d.h.w. system

1 Turn off the d.c.w. inlet isolating valve (12 in

Fig. 9.3) and turnon thehot watertaps and any
drain cocks.

A

B

MAINTENANCE

11

Fig. 9.1

131215

Fig. 9.3

Closed position

9.4 Emptying the c.h. system

1 Close the c.h. isolating valves (11 and 15 in

Fig. 9.3).

2 Open the central heating drain cock (17 in

Fig. 9.4).

39

Maintenance

17

Fig. 9.4

3 A small quantity of water will remain in the

d.h.w. heat exchanger after draining. If the
boiler is being drained to prevent freezing, the
d.h.w. heat exchanger must be removed and
inverted to d rain fully or an antifreeze solution
added.

Air--- Flue exhaust
Sampling points

9.5 Combustion analysis check

To carry out a combustion analysis:

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

tion 9.2 in this manual).

MAINTENANCE

2 Remove the plugs indicated in Fig. 9.5.

40

Fig. 9.5

Reference figures are given in the sections 4.5 or

4.6 of this manual (Flue gas figures).

9.6 Cleaning the primary heat

exchanger

1 Takeoffthefrontofthecase.

2 Take off the removable front of the air---tight

chamberand thefront panelof the combustion
chamber.

If you notice dirt on the fins of the primary heat ex­changer (31 on page 11):

3 cover the sloping surfacesof the burner (29 on

page 11) entirely in a protective layer (sheets of
newspaper or similar).

4 Brush out the primary heat exchanger (31 on

page 11) with a bristle paintbrush.

NOTE --- When removing the airtight chamber
cover it is not necessary to remove the screws lo­cated at the top edge on either side.

Maintenance

9.7 Checking the pressurisation

in the expansion vessel

Empty the central heating system as described in
section 9.4 of this chapter and check that the pres­sure in the expansion vessel is not less than 1 bar.
See also section 4.4 page 13 of this manual.

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

9.8 Cleaning the burner

The sloping and multi--- gas type burner (29 on
page 11) 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 air---tight

chamberand thefront panelof the combustion
chamber.

3 Bru sh out the burner with a bristle paintbrush.

NOTE --- When removing the airtight chamber
cover it is not necessary to remove the screws lo­cated at the top edge on either side.

9.9 Checking the flue

Have the integrity of the flue outlet pipe (45 on
page 12) air intake pipe (46 on page 12), checked
periodically, the venturi device* (42 on page 12)
cleaned and the efficiency of the flue safety circuit
checked at least once a year.

* For details see the section Fan, venturi device
and air pressure switch in the service manual.

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

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

soundness

Check appliance for gas soundness. Recheck op­erational pressures and adjust as necessary as
described in section 7.6 page 32 of this manual.

MAINTENANCE

41

*1796209158*

07/05

2008

N

17962.0915.8 1908 52A5 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