Ferroli Optimax HE 31 C, OPTIMAX HE 38 C, Optimax HE Plus 38 C Instructions For Installation, Use And Maintenance Manual

OPTIMAX HE 31 C

wall-mounted gas fired,
pre-mix
condensing combination boiler



cod. 3540E64/1 - 11/2006

INSTRUCTIONS FOR USE INSTALLATION AND MAINTENANCE
FOR THE UNITED KINGDOM AND EIRE

G.C. n° 47-267-42

OPTIMAX HE 31 C

IMPORTANT

• Your "benchmark" Installation, Commissioning and Service Record Log Book is enclosed in the

last pages of this manual. “This record must be completed and left with the end user”.

Ferroli is a member of the Benchmark initiative and fully supports the aims of the programme.

Benchmark has been introduced to improve the standards of installation and commissioning of
central heating systems in the UK and to encourage the regular servicing of all central heating
systems to ensure safety and efficiency. Please see installation and servicing guidelines.

For EIRE ( Southern Ireland ) it is necessary to complete a “Declaration of Conformity “ to indicate

compliance to I.S. 813. An example of this is given in the current edition of I.S. 813. In addition
it is necessary to complete the “Benchmark” logbook.

• "Ferroli declare that no substances harmful to health are contained in the appliance or used

during the appliance manufacture”.

This symbol indicates “Caution” and is placed next to all safety information.
Strictly follow these instructions in order to avoid danger and damage to persons,
or property.

This symbol calls attention to a note or important information, please read thor­oughly.

• Read the warnings given in this manual thoroughly.
They provide important information for safe instal­lation, use and maintenance

• By law the instruction manual must be left with the
end user.

• If the appliance is sold or transferred to another
owner or if the owner moves, leaving the appliance
behind, always ensure that the manual is kept with
the appliance for consultation by the new owner
and /or installer.

• Incorrect installation or poor maintenance absolves
the manufacturer from all liability for damage to
people or property.

• Installation and maintenance must be carried out
in conformity with current legislation, according
to the manufacturer’s instructions and by qualified
personnel.

• Before service or maintenance work is, carried out
isolate the appliance from the mains electricity
supply.

• In the event of malfunction or faulty operation, iso­late the appliance. Do not attempt to repair or carry
out any other operation on the appliance directly.
Contact qualified personnel only.

• Repairs or the replacement of components must be
carried out exclusively by qualified personnel using
original spare parts only. Failure to respect the above
may compromise the safety of the appliance.

• To guarantee efficient operation, the appliance must
be serviced once a year by a corgi registered engi­neer.

• The appliance may not be used for purposes other
than those for which it was explicitly designed. Any
other use is considered improper and therefore dan­gerous.

• Incorrect installation and use or failure to follow the
instructions provided by the manufacturer absolve
the manufacturer from all liability for damage.

• After unpacking, check that the contents are complete
and undamaged.

• Keep the packaging out of reach of children as it is
potentially hazardous.

• To clean external parts, use a damp cloth moistened
with soapy water if necessary. Avoid using abrasive
cleaning products and solvents.

2

OPTIMAX HE 31 C

1. OPERATING INSTRUCTIONS .................................................................4

1.1 Introduction ............................................................................................................4

1.2 Control panel ..........................................................................................................5

1.3 Turning ON and OFF ..............................................................................................6

1.4 Adjustments ............................................................................................................8

1.5 Maintenance ..........................................................................................................11

1.6 Faults .....................................................................................................................11

2. INSTALLATION .....................................................................................12

2.1 General Instructions ..............................................................................................12

2.2 Boiler location .......................................................................................................13

2.3 Boiler water connections ......................................................................................14

2.4 Connection to the gas system ..............................................................................16

2.5 Electrical Connections ..........................................................................................16

2.6 Flue system ...........................................................................................................18

2.7 Condensate outlet connection .............................................................................24

3. SERVICE AND MAINTENANCE ............................................................26

3.1 Adjustments ..........................................................................................................26

3.2 System start-up .....................................................................................................27

3.3 Maintenance ..........................................................................................................28

3.4 Troubleshooting ....................................................................................................30

4. TECHNICAL CHARACTERISTICS AND DATA ..........................................................32

4.1 Dimensions and connections ................................................................................32

4.2 General view and main components ....................................................................33

4.3 Hydraulic diagram .................................................................................................34

4.4 Technical data table ..............................................................................................35

4.5 Diagrams ...............................................................................................................36

4.6 Wiring diagram .....................................................................................................37

cod. 3540E64/1

BENCHMARK ...........................................................................................38



3

OPTIMAX HE 31 C

1. OPERATING INSTRUCTIONS

1.1 Introduction

Dear Customer,
Thank you for choosing the OPTIMAX HE 31 C, a FERROLI wall-mounted boiler of the latest generation,

featuring advanced design and cutting-edge technology.
OPTIMAX HE 31 C is a high-efficiency condensing pre-mix appliance for heating and hot water pro-

duction with extremely low emissions, running on natural gas or LPG.
The boiler consists of an aluminium laminar heat exchanger providing effective condensation of the

water vapour contained in the flue gases, permitting extremely high efficiency.
Above the heat exchanger, in the boiler, there is a pre-mix burner, with a large ceramic surface, equip-

ped with electronic ignition and ionization flame control, which achieves extremely low emissions while
ensuring high reliability and long life operation.

The boiler is totally room sealed from the installation room: the air needed for combustion is drawn from
outside. The boiler also includes a modulating speed fan, modulating gas valve, pump, expansion vessel,
safety valve, flow sensor, temperature sensors, a safety thermostat and a low water pressure switch.

Thanks to the twin microprocessor control and adjustment system with advanced self-diagnosis, unit
operation is for the most part automatic. The power for heating is automatically governed by the control
system.

The user only has to set the temperature desired inside the home by means of a room thermostat and
appliance temperature control. The adjustment and control system will provide optimum operation
throughout the year.

The display continuously provides information on the unit’s operating status and it is easily possible
to obtain additional information on the sensor temperatures, set-points, etc. or configure them. Any
operating problems associated with the boiler or system is immediately signalled by the display and, if
possible, corrected automatically.

4

OPTIMAX HE 31 C

1.2 Control panel

89

10

11

12

21

436

15

comfort

1314

fig. 1

75

eco

reset

1 = Domestic Hot Water temperature setpoint decreasing push button
2 = Domestic Hot Water temperature setpoint increasing push button
3 = Central Heating water temperature setpoint decreasing push button
4 = Central Heating water temperature setpoint increasing push button
5 = Display LCD
6 = Reset / Summer-Winter / OTC push button
7 = Economy-Comfort / On-Off push button
8 = Domestic Hot Water symbol
9 = Domestic Hot Water mode operation
10 = Summer symbol
11 = Multi-function indication
12 = Economy symbol
13 = Central Heating mode operation
14 = Central Heating symbol
15 = Burner on and actual load indication

Indication during boiler operation

Central Heating mode

The Central Heating heat demand (generated by the OpenTherm Remote Control, the Room Thermostat
or the Clock) is indicated by the flashing of the Hot Air symbol over the radiator (part. 13 and 14 – fig.

1). The display indicates the actual Central Heating water temperature (part. 11 – fig. 1).

fig. 2

eco

comfort

reset

5

OPTIMAX HE 31 C

Domestic Hot Water mode

The Domestic Hot Water heat demand (generated by the DHW flow sensor or due to a Comfort request)
is indicated by the flashing of the Hot Water symbol under the tap (part. 8 and 9 – fig. 1). The display
indicates the actual Domestic Hot Water temperature (part. 11 – fig. 1).

eco

comfort

reset

fig. 3

1.3 Turning ON and OFF

Without main power supply

fig. 4 - Boiler without main power supply

To avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all
water from the system.

Ignition

Ensure the power is on to the appliance.

eco

comfort

reset

eco

comfort

reset

eco

comfort

reset

fig. 5 Ignition

For the firsts 120 seconds, the display shows FH that identifies the Air purge function.

•
During the first 5 seconds, the display shows the software version of the pcb.

•
Open the gas cock on the boiler and purge the air from the pipework upstream of the gas valve.

•
When the FH disappears, the boiler is ready to function automatically whenever the external controls

•
are calling for heat.

6

OPTIMAX HE 31 C

Turning off

Press the (part. 7 - fig. 1) for 5 seconds.

When the boiler is turned off with this key, the p.c.b is still powered, heating operation is disabled and
the display is off however the frost protection will still be active.

To totally isolate close the gas cock ahead of the boiler and disconnect electrical power.

To avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all
water from the system.

eco

comfort

reset

fig. 6 - Turning off

To turn boiler on again, press (part.7 - fig.1) for 5 seconds.

eco

comfort

reset

fig. 7

If there is no heat demand, the display shows the actual water pressure (bar/10).
The boiler is ready to function automatically whenever the external controls are calling for heat.

7

1.4 Adjustments

Summer/Winter selection

OPTIMAX HE 31 C

To select Summer, press the

reset

(Part. 6 – fig. 1) for 1 second when the boiler is in Winter mode.

eco

comfort

reset

fig. 8

The display will show the Summer icon (Part 10 – fig. 1): the boiler can still produce domestic hot water
whenever there is a demand. The frost protection remains active.

To select Winter mode, press the

reset

(Part. 6 – fig. 1) for 1 second when the boiler is in Summer

mode.

Heating temperature setting

To set the system flow temperature, use the CH push buttons (Part. 3 and 4 – fig. 1). It can be
varied from a minimum of 20°C to a maximum of 90°C.

eco

comfort

reset

fig. 9

Domestic hot water temperature setting

To set the hot water temperature, use the DHW push buttons (Part. 1 and 2 – fig. 1). It can be
varied from a minimum of 40°C to a maximum of 55°C.

eco

comfort

reset

fig. 10

8

OPTIMAX HE 31 C

Room temperature adjustment (using a room thermostat )

Using the room thermostat, set the temperature desired. Controlled by the room thermostat, the boiler
lights and heats the system water to the system delivery setpoint temperature. The burner shuts down
when the desired temperature in the room is reached.

A room thermostat and programmer are a mandatory requirement (Building regulations Doc ‘L’

2002).

Room temperature adjustment (using an optional Remote Control)

Using the remote control, set the temperature desired. The flow temperature will be controlled by the
remote control. For settings and other informations, see the relative manual.

Economy/Comfort selection

The unit is equipped with a special internal device that ensures a high hot-water delivery speed and
excellent user comfort. When comfort mode is active the water in the boiler is maintained at a pre-de­termined temperature, which means that hot water is available at the boiler outlet as soon as a tap is
opened, ie with no waiting.

The user can turn the device off (ECO mode) by pressing (part.7 - fig.1). In ECO mode the display

shows the relevant symbol (part. 12 - fig. 1). To turn on COMFORT mode, press (part.7 - fig.1) again,
the ECO symbol will vanish from the display.

Outside temperature compensation

When the (optional) external sensor kit is fitted to the appliance, the system can work in Outside tem­perature compensation mode. In O.T.C. mode the temperature of the heating system is controlled
according to the external climate conditions, this will guarantee a high degree of comfort and energy
saving all year round.

By the CH push buttons (Part. 3 and 4 – fig. 1) is possible to set the maximum flow temperature
for the installation.

O.T.C. setting

reset

To enter the OTC mode, press
The display shows CU flashing (fig. 11); to set Curve, use the DHW push buttons (Part. 1 and 2 – fig.

1). It can be varied from 1 to 10, in accordance with the chart (fig. 13). O means no O.T.C. mode.
It is recommended a start point of 20 - 30°C and a flow temperature of 85°C is required for the UK

(Curve 9 or 10).

(Part. 6 – fig. 1) for 5 seconds.

eco

comfort

reset

fig. 11

9

OPTIMAX HE 31 C

By pressing the CH push buttons (Part. 3 e 4 – fig. 1), the display shows OF flashing (fig. 12); to
set Offset, use the DHW push buttons (Part. 1 and 2 – fig. 1). It can be varied from 20 to 40, in
accordance with the chart (fig. 14).

eco

comfort

reset

fig. 12

To exit the OTC mode, press

Maximum boiler flow temperature

reset

(Part. 6 – fig. 1) for 5 seconds.

Outside temperature

fig. 13

Maximum boiler flow temperature

10

Outside temperature

Maximum boiler flow temperature

Outside temperature

fig. 14

OPTIMAX HE 31 C

1.5 Maintenance

It is strongly recommended to carry out annual maintenance of the boiler and heating system. Please
refer to the “maintenance” section in this manual.

The casing, the control panel and the aesthetic parts of the boiler can be cleaned using a soft and damp
cloth, do not use abrasives or solvents.

1.6 Faults

In the unlikely event of an operating problem, or component failure, the display flashes and a fault
identification code appears.

The boiler is equipped with an advanced self-diagnosis system that signals any faults on the display.
Some faults (“A“ indication) cause a boiler shutdown. In this case, operation must be reset manually by

pressing the
Other faults (“F“ indication) cause temporary shutdowns that are automatically reset as soon as the

value causing the fault comes back within the boiler’s normal working range.
Listed below are some anomalies that can be caused by simple, user-solvable problems.
If the problem remains after two attempts at resetting, contact the Ferroli Service Centre.
For other faults, refer to section 3.4 “Troubleshooting”.

reset

(Part. 6 – fig. 1) for 1 second.

Fault Cure

Make sure that the gas cocks ahead of the boiler
and on the meter are open.

No burner ignition

Low system pressure

Before calling a Ferroli service engineer, check that the problem is not due to there being no
gas or electricity, or low system pressure.

Press the RESET button (for 1 second).
In case of repeated shutdowns, contact the Ferroli

Service centre.

Fill the ‘system to 1-1.5 bar.

11

2. INSTALLATION

2.1 General Instructions

This device must only be used for the purpose for which it is specially designed. This unit is
designed to heat water to a temperature below boiling point and must be connected to a hea­ting system and/or a water supply system for domestic use, compatible with its performance,
characteristics and its heating capacity. Any other use is considered improper.

BOILER INSTALLATION MUST ONLY BE PERFORMED BY QUALIFIED PERSONNEL, IN ACCORDANCE
WITH ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE PROVISIONS OF CURRENT
LAW, THE RECOMENDATION OF BS STANDARDS, ANY LOCAL REGULATIONS AND THE RULES OF
COMPETENT WORKMANSHIP.

IN IE, THE INSTALLATION MUST BE CARRIED OUT BY A COMPETENT PERSON IN ACCORDANCE
WITH THE CURRENT EDITION OF I.S. 813 “DOMESTIC GAS INSTALLATIONS”, THE CURRENT BUI­LDING REGULATIONS AND REFERENCE SHOULD BE MADE TO THE CURRENT ETCI RULES FOR
ELECTRICAL INSTALLATIONS.

Incorrect installation can cause damage or physical injury for which the manufacturer declines any
responsibility.

OPTIMAX HE 31 C

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

The Gas Safety Regulations (Installations & Use).
The Local Building Regulations.
The Building Regulations (Part L).
The Buildings Standards (Scotland - Consolidated) Regulations.
British Standards Codes of Practice:
B.S. 5440 Part 1 Flues
B.S. 5440 Part 2 Air supply
B.S. 5449 FORCED CIRCULATION HOT WATER SYSTEMS
B.S. 6798 INSTALLATION OF GAS FIRED HOT WATER BOILERS
B.S. 6891 GAS INSTALLATIONS
B.S. 7671 IEE WIRING REGULATIONS
B.S. 4814 SPECIFICATION FOR EXPANSION VESSELS
B.S. 5482 INSTALLATION OF LPG
B.S. 7593 TREATMENT OF WATER IN DOMESTIC HOT WATER CENTRAL HEATING SYSTEMS
B.S. 5546 INSTALLATION OF HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
I.S. 813 DOMESTIC GAS INSTALLATIONS (EIRE ONLY)

Model Water Bye Laws
B.S. 5955-8 PLASTIC PIPEWORK INSTALLATION

12

For Northern Ireland the rules in force apply

OPTIMAX HE 31 C

2.2 Boiler location

The unit’s combustion circuit is sealed off from
the installation room and therefore requires no
compartment ventilation.

The installation room must be sufficiently well
ventilated to prevent any dangerous condi­tions from forming in the event of even slight
gas leakage. This safety standard is required
by the EEC Directive no. 90/396 for all gas
units, including those with a so-called sealed
chamber.

Therefore the place of installation must be
free of dust, flammable materials or objects
or corrosive gases. The room must be dry and
not subject to freezing.

The boiler is designed to be installed on a solid
wall. The wall fixing must ensure a stable and
effective support for the appliance, using the
bracket and fixings supplied.

If the unit is enclosed in a cupboard or moun­ted alongside, there must be space for normal
maintenance work. Fig. 15 and tab. 1 gives the
minimum clearances to leave around the unit.

C

A A

B

D

fig. 15

Table 1

Minimum

A

2,5 cm

B

20 cm

C 30 cm

60 cm

D

(via an openable panel)

Safe Handling of Substances

Care should be taken when handling the boiler
insulation panels, which can cause irritation to the skin. No asbestos, mercury or CFCs are included in
any part of the boiler.

Product Handling Advise

When handling or lifting always use safe techniques - keep your back straight, bend your knees, don’t
twist - move your feet, avoid bending forwards and sideways and keep the load as close to your body
as possible.

Where possible transport the boiler using a sack truck or other suitable trolley.
Always grip the boiler firmly, and before lifting feel where the weight is concentrated to establish the

centre of gravity, repositioning yourself as necessary.

13

OPTIMAX HE 31 C

2.3 Boiler water connections

The heating capacity of the unit should be previously established by calculating the building’s heat requi­rement according to current regulations. For good operation and long life of the boiler, the plumbing
system must be well proportioned and always complete with all those accessories that guarantee regular
operation and running, room thermostat, trv’s etc. The flow and return must be a minimum diameter of
22 mm for the first 3 metres from the appliance.

If the flow and return pipes follow a path where air pockets could form in certain places, it is essential to
install vent valves at these points. Also, install type “A” drain cocks at the lowest points in the system
to allow complete draining.

The temperature differential between the flow manifold and the return to the boiler should not exceed
20° C.

A minimum flow of 6 litres/min is required through the heat exchanger. An automatic by-pass is fitted
to the boiler which will provide this flow rate in most circu­mstances.

Do not use the water system pipes to earth electrical
appliances.

Before installation, carefully flush all the pipes of the heating
system to remove residues or impurities that could affect the
unit’s operation (BS 7593 Building regs Doc L).

Make the connections to the appliance as shown in fig. 16

Key

1 System flow (22 mm with isolation valve fitted)
2 DHW outlet (15 mm )
3 Gas inlet (22 mm with isolation valve fitted)
4 Cold main inlet (15 mm with isolation valve fitted)
5 System return - 22 mm with isolation valve fitted (c/w filter)

6 Pressure Relief Valve
7 Condense outlet

It is essential to install the isolation valves supplied between the boiler and heating system, allowing the
boiler to be isolated from the system if necessary.

The safety valve outlet must be connected to a 15mm diameter copper pipe, with a continual
fall from the boiler to allow system water out onto the ground in the event of over-pressure in
the heating circuit. If this is not done, and the drain valve trips and floods the room, the boiler
manufacturer is not to be held responsible. The outlet should face back against the outer bri­ckwork or building face to prevent harm or injury from hot water discharging in the event of an

over-pressurised system.
Make the boiler connection in such a way that its internal pipes are free of stress. If a check valve is
installed on the tap water circuit (where applicable), it is necessary to mount a safety valve between the
boiler and this circuit (check valve minimum 3 metres from boiler) or a domestic expansion vessel.

7 6

1 2 3 5

76,2 80,5

82,5 76 54 51 80,5 56

fig. 16

4

216,7

156,7

14

OPTIMAX HE 31 C

The isolation valves and filling kit shown in Fig. 17 is supplied as standard.

1 - The kit consist of the following items shown in fig 17.

&&&&

((((

''''

%%%%

$$$$

))))

Key

A Cold water inlet valve
B Double check valve
C Blanking cap
D Removable connection
E Blanking plug
F Isolation valve
G C/H return valve & filter

****

fig. 17

2 - Connect the items together as shown in fig. 18. 3 - .....and then connect the completed assembly

to the boiler as shown in fig. 19.

fig. 18 fig. 19

Make Up Water

Provision must be made for replacing water lost from the sealed system. Reference should be made
to BS6798, for methods of filling and making up sealed systems. There must be no direct connection
between the boiler's central heating system and the mains water supply. The use of mains water to
charge and pressurise the system directly, is conditional upon the Local Water Byelaws. Again any such
connection must be disconnected after use.

A filling connection is supplied with the valve set in the boiler box.
Attention - is drawn to the Model Water Byelaws.

15

OPTIMAX HE 31 C

Water treatment

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

Fernox Manufacturing Co. LTD. Sentinel Performance Solutions Ltd
Cookson Electronics, Forsyth Road The Heath Business & Technical Park
Sheerwater, Woking, surrey, GU21 5RZ Runcorn, Cheshire WA7 4QX
Tel: [phone] Tel: [phone]

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

Note - In hard water areas treatment to prevent lime scale may be necessary.
Note - It is important that the correct concentration of the water treatment product is maintained in

accordance with the manufacturers instructions.

2.4 Connection to the gas system

If necessary the local Gas supplier should be consulted, at the installation planning stage, in order to
establish the availability of an adequate supply of gas.

An existing service pipe must not be used without prior consultation with the local Gas supplier.
A gas meter can only be connected by the Local Gas supplier, or by a Local Gas suppliers Contractor.
Installation pipes should be fitted in accordance with BS6891.
Appliance inlet working pressure must be 20mbar MINIMUM, for NG and 37 mbar minimum for LPG.
Do not use pipes of a smaller size than the combination boiler inlet gas connection (22 mm).

The complete installation must be tested for gas soundness and purged as described in BS689. All

pipework must be adquately supported. An isolating gas valve is provided and should be fitted on

the boiler gas inlet. Please wait 10 minutes when lighting from cold before checking. Gas pressures

should be checked after the boiler has operated for 10 minutes to reach thermal equilibrium. This

appliance has no facility to check the burner pressure, however if the inlet pressure and the gas

rate are correct the boiler should be set correctly, the gas valve is set and sealed at the factory

and should not be adjusted without authorisation from Ferroli Personnel. A combustion test can

be carried out to ensure correct air/gas mix (see page 29 combustion analyser testing).

The isolation kit shown in Fig. 17 is supplied as standard.

2.5 Electrical Connections

The unit must be installed in conformity with current national and local regulations.

Connection to the electrical supply

The boiler must be connected to a single-phase, 230 Volt-50 Hz electric supply.

The unit’s electrical safety is only guaranteed when correctly connected to an efficient earthing

system installed according to current safety standards. Have the efficiency and suitability of the

earthing system checked by professionally qualified personnel. The manufacturer is not responsible

for any damage caused by failure to earth the system. Also make sure that the electrical system

is adequate for the maximum power absorbed by the unit, as specified on the boiler dataplate,

in particular ensuring that the cross sectional area of the system’s cables is suitable for the power

absorbed by the unit.
The boiler is prewired and provided with a cable and fitted with a 3 amp fused plug for connection to
the electricity supply. It is important to respect the polarities (LIVE: brown wire / NEUTRAL: blue wire
/ EARTH: yellow-green wire) in making connections to the electrical supply.

16

OPTIMAX HE 31 C

The user must never change the unit’s power cable. If the cable gets damaged, switch off the unit
and have it changed only by professionally qualified personnel. If changing the electric power cable,
use only “HAR H05 VV-F” 3x0.75 mm2 cable with a maximum outside diameter of 8 mm.

Access to the electrical terminal block

Follow the instructions given in fig. 20 to access the electrical connection terminal board. The layout of
the terminals for the various connections is given in the wiring diagram in the Technical Data chapter.

Key

72 Room thermostat (Volt Free)
138 Outside temperature sensor
139 Room unit (OpenTherm)

fig. 20

fig. 21

17

OPTIMAX HE 31 C

Room thermostat

CAUTION: THE ROOM THERMOSTAT MUST HAVE VOLTAGE FREE CONTACTS. CONNECTING

230 V. TO THE TERMINALS OF THE TIME CLOCK AND ROOM THERMOSTAT WILL IRREPARA-

BLY DAMAGE THE P.C.B.

2.6 Flue system

The unit is “type C” with a sealed chamber and forced draught, the air inlet and flue outlet must be
connected to one of the following flue systems. With the aid of the tables and methods of calculation indi­cated, before commencing installation, it is first necessary to check that the flue system does not exceed
the maximum permissible length. The current standards and local regulations must be observed.

It should be noted that only Ferroli flue system and accessories should be used on this appliance,

as per BS 5440 2000 and C.E. test certification.

18

OPTIMAX HE 31 C

Connection with concentric flue system

The unit can be connected to a concentric air/flue duct with a horizontal or vertical outlet as shown on
the following drawings. Numerous accessories are available on request to meet the various installation
requirements. Please refer to our “flue manual” or the price list.

Standard concentric flue installation

Standard 1KWMA53A
Flue kit

80

Rear Outlet

Side view

P

96

S

95

30

View from above

156

50*

125

* = between
10 e 60 mm

Install level

Drill the wall 10÷20 mm
more than the pipe diameter

80

156

30

95

215 185

View from above

Side Outlet

Front view

L

DS

50*

* = between
10 e 60 mm

Install level

Drill the wall 10÷20 mm
more than the
pipe diameter

185215

fig. 22a

110

S 50*

P

Install level

P = S + 146 mm

fig. 22b

30

95

215 185

L = S + D + 170 mm

DS50*

L

Install level

Horizontal flue installation

1. Define the position for installing the unit.

2. If using standard flue (1KWMA53A) this must be installed level, for non-standard flue lengths over
1mtr a fall of 3 mm back to the boiler per metre should be incorporated.

3. Make a hole of diameter 10 - 20 mm greater than the nominal diameter of the concentric pipe
used.

4. If necessary, cut the terminal length to size, ensuring that the external pipe protrudes from the wall
by between 10 and 60 mm (fig. 22a and 22b). Remove the cutting burrs.

5. Connect the flue to the boiler, positioning the seals correctly. Seal the flue into the wall with silicone
or sand + cement and cover with wall seals provided.

Flue seals should be lubricated with a silicone type grease to prevent damage (grease not sup­plied)

19

OPTIMAX HE 31 C

Vertical Outlet

The total length in equivalent metres of the concentric flue must not exceed the maximum lengths stated
in the following table, note that each bend gives rise to the stated reduction. For example, a duct = 60/100
composed of 1 bend of 90° +1 horizontal metre + 2 bends of 45° + 1 horizontal metre has a total equivalent
length of 4 metres.

Vertical flueing

The installation of a concentric vertical flue can be carried out as follows,
Install the appliance as previously mentioned in this manual.

1. Connect onto the flue assembly at the top of the appliance a concentric vertical adaptor part number
1KWMA71W,

2. Use the required amount of 1mtr flue extensions (part number 1KWMA56U) inserting them spigot
down ensuring the seals are well lubricated with silicone grease (not supplied) and correctly located
into the sockets.

3. If required 45° bends (Part number1KWMA64A)
may be used with a resistance value of 0.5mtrs

1000 125

50

950

50

10

max. 6 mt 60/100

max. 16 mt 80/125

each, the flue should be routed in such away
to avoid any unnecessary deviation and thus
minimise the amount of bends required.

4. The termination should be made through our
concentric flue outlet (part number 1KWMA83U)
in conjunction with a roof slate pitched (part
number 1KWMA82U) or flat roof (part number
1KWMA81U) The storm collar must be fixed on
using the three screws provided and sealed with
an external grade silicone (not supplied).

5. For longer flue lengths a 125mm concentric flue
system is available.

6. All flue installations must comply with BS5440
part 1 and must only be of Fèrroli manufacture.
The vertical flue must continually rise and be
supported throughout its length. The flue must
be inspected whilst commissioning the appliance
to ensure it is sound throughout its length.

Vertical Terminal

1KWMA83U

Pitched roof slate

1KWMA82U

1KWMA56U

20

This information is for guidance purposes and Fèr­roli will in no way be held responsible for incorrect
installation following this guide.

Table 2a

Maximum permissible
duct length (Horizontal)

Maximum permissible
duct length (Vertical)

Table 2b

Reduction factors for bends

Ø mm

60/100

5 m 15 m

6 m 16 m

Ø mm

80/125

1 m

0,5 m

0,5 m

0,25 m

1KWMA71W

50 950

95050

68

fig. 22c

OPTIMAX HE 31 C

Connection with 80 mm pipe system

The unit can be connected to a system of separate air/flue
pipes for a horizontal or vertical outlet as shown fig 23 - 24
. Numerous accessories are available on request to meet
the various installation requirements. The components
used most frequently are stated in tables 4 - 5. Please
refer to the flue manual or the price list for additional
components.

To check you do not exceed the maximum permissible
flue length, it is necessary to make a simple calculation
before installation:

1KWMR54A

95

120

Ø80

FLUE

120

Ø80

AIR

Remove
the closing
cap

65

156

1. For each component, tables 4 - 5 provide an “equiva­lent loss in linear metres”, depending on the position
of installation of the component (with air intake or flue
extraction, vertical or horizontal).

The loss is called “equivalent length” since it is compared

to the loss of one metre of flue (defined as equal to 1).
For example, a bend at 90° of Ø80 in flue extraction has
an equivalent loss of 2 linear metres, i.e. it has a loss
equal to that of 2 linear metres of flue length.

2. After completely defining the layout of the system of twin
flues, add up the losses in equivalent metres, depending
on the installation position, of all the components and
accessories in the system.

3. Check that the total calculated loss is less than or equal
to 75 equivalent metres, i.e. the maximum permissible
for this model of boiler.

For complete flue options please contact ferroli or
check our comprehensive flue manual.

330

fig. 23

1KWMA84U

5

1KWMA82U

Table 3

Ref.

2

4

5

23

23

1KWMA83W

4

Description

Vertical air pipe Ø80

Vertical flue pipe Ø80

1

80 Ø vertical flue Kit

Total

Equivalent

loss

23,0 m

36,8 m

12,0 m

71,8 m

1KWMR54A

2

fig. 24

21

Table of Ø80 flue and accessory

Table 4 Table 5

Equivalent losses in

metres (linear)

Accessories Ø 80 Accessories Ø 80

Air Flue

OPTIMAX HE 31 C

Equivalent losses in

metres (linear)

Air Flue

Description

Pipe Ø 80

male-female

1KWMA83W  1,00 m

Bend 45° Ø 80 mm

male - female

Bend 90° Ø 80 mm

male - female

Terminal Position

1KWMA65W

1KWMA01W

Vertical

Horizontal

Vertical

1 1 1.6 2

1.2 1.8

1.5 2.0

Horizontal

terminal

Description

1KWMA86A

1KWMA85A

1KWMA84U

Vertical

Horizontal

Vertical

Horizontal

5

2

12

Horizontal

Horizontal

flue terminal

air terminal

Vertical flue

The stated loss values refer to genuine Ferroli flue accessories.

P

Q

l

Q

D, E

Q

F

J

L

B

G

C

A

H

N

MM

N

H

K

fig. 25

22

OPTIMAX HE 31 C

Minimum Dimensions of Flue Terminal Positions

A

B

C

D

E

F

G

H

I

J

K

L

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

Above an opening, air brick,

opening windows, etc.

Horizontally to an opening, air brick,

opening windows, etc.

Below gutters, soil pipes or drain pipes

Below eaves

Below balconies or car port roof

From a vertical drain pipe or soil pipe

From an internal or external corner

Above ground roof or balcony level

From a surface facing the terminal

From a terminal facing the terminal

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

300mm

300mm

300mm

75mm

200mm

200mm

150mm

100mm

300mm

600mm

1200mm

1200mm

M

N

O

P

Q

NOTE

N/A = Not applicable

In addition, the terminal should not be nearer than 150mm (fanned draught)
to an opening in the building fabric formed for the purpose
of accommodating a built-in element such as a window frame.

Condensing Terminal Positions: If the flue is to be terminated at low level, then the
potential effect of the plume must be considered.
Plume management kits are available from Ferroli.

The plume should not be directed:

Vertically from a terminal on the same wall

Horizontally from a terminal on the same wall

From the wall on which the terminal is mounted

From a vertical structure on the roof

Above intersection with roof

across a frequently used access route

towards a window or door

across a neighbouring property

1500mm

300mm

N/A

150mm

300mm

23

OPTIMAX HE 31 C

Connection to collective flues or single flues with natural draught

If you are then going to connect the OPTIMAX HE 31 C boiler to a collective flue or a single flue with
natural draught, the flue must be expressly designed by professionally qualified technical personnel in
conformity with the standards and rules in force.

In particular, flues must have the following characteristics:

• Be sized according to the method of calculation stated in the standard

• Be airtight to the products of combustion, resistant to the fumes and heat and waterproof for the
condensate

• Have a circular or square cross-section (some hydraulically equivalent sections are permissible), with
a vertical progression and with no constrictions

• Have the flue conveying the hot fumes adequately distanced or isolated from combustible mate­rials

• Be connected to just one unit per floor, for at most 6 units in all (8 if there is a compensation duct or
opening)

• Have no mechanical suction devices in the main ducts

• Be at a lower pressure, all along their length, under conditions of stationary operation

• Have at their base a collection chamber for solid materials or condensation of at least 0.5 m, equipped
with a metal door with an airtight closure.

2.7 Condensate outlet connection

B

A

0,5 lt.

24

fig. 26

The boiler is equipped with an internal air-trap to drain off the condensate. Fit the inspection coupling
A and the hose B, pushing it on for approximately 3 cm and securing it with a clamp.

Fill the air-trap with approximately 0.5 ltrs of water and connect the hose to the waste system, or
soakaway.

OPTIMAX HE 31 C

Condensate discharge

Where possible the condensate should discharge into an internal soil pipe or waste system. The minimum
pipe diameter required is 22 mm, a trap has already been fitted to the appliance with a flexible tail to
facilitate the connection to the condensate discharge pipe.

The pipe should be a solvent weld plastic, not copper, as the condensate has a ph value of 4 (slightly
acidic).

Where it is not possible to terminate internally, the condensate discharge pipe may be run outside (see
below drawing).

Any external run is subject to freezing, in severe weather conditions. To avoid this the pipework should
be installed to dispose of the condensate quickly, with as much as possible run internally, before passing
through the wall.

Pipework external to the building should be increased in diameter to 32 or 40 mm solvent weld. It should
be run to a external drain or soakaway, with a maximum length of 3 metres.

When a soakaway (condensate absorption point) is used, it should be constructed as shown below, or
use a specifically designed unit, for example Mc Alpine SOAK1GR available from most plumbing and
heating stockists.

Internal

External

32/40mm Solvent weld pipework 2.5 * Minimum Fall see below

Cement seal

25mm

100mm Dia tube

Lime stone chippings

Hole depth 400mm

Ground level (either/Or)

-300mm

2 Rows of
3x12 mm Holes

Bottom sealed

fig. 27

25

OPTIMAX HE 31 C

3. SERVICE AND MAINTENANCE

3.1 Adjustments

All adjustment and conversion operations must be carried out by Qualified Personnel such as ferroli
Technical Service.

FERROLI declines any responsibility for damage or physical injury caused by unqualified and unauthorized
persons tampering with the device.

Gas supply conversion

The unit can function with either Natural Gas or LPG and is factory-set for use with one of the two gases,
as clearly shown on the packing and on the unit’s dataplate. Whenever a different gas to that for which
the unit is preset has to be used, a conversion kit will be required, proceeding as follows:

1 Remove the casing.
2 Open the airtight chamber.
3 Unscrew the gas coupling A on the air/gas mixer.
4 Replace the injector in the mixer with the one contained in the conversion kit.
5 Refit the coupling A and check the connection is gastight.
6 Apply the sticker, contained in the conversion kit, near the dataplate.
7 Fit the airtight chamber and casing back on.
8 Check working pressure.
9 Check CO2 mixture as detailed (page 29 combustion analyser testing).

fig. 28

A

Injector Ø

Natural gas LPG

See technical data table

26

OPTIMAX HE 31 C

3.2 System start-up

Commissioning must be performed by Qualified Personnel.
Checks to be made at first ignition, and after all maintenance operations that involved discon­necting from the systems or an intervention of a safety device.

Before lighting the boiler:

• Open any isolation valves between the boiler and the system.

• Check the tightness of the gas system, proceeding with caution and use gas leak detection fluid to
detect any leaks in connections.

• Fill the water system and make sure that all air contained in the boiler and the system has been vented
by opening the air vent valve on the boiler and any vent valves on the system.

• Make sure there are no water leaks in the system, hot water circuits, connections or boiler.

• Make sure the electrical system is properly connected.

• Make sure that the unit is connected to a good earthing system.

• Make sure there are no flammable liquids or materials in the immediate vicinity of the boiler.

• Vent and spin the pump.

• Ensure the flue system is correctly fitted, including terminal locations.

Ignition

• Open the gas valve upstream of the boiler.

• Purge the air from the installation pipework to the appliance.

• Switch on the boiler electrical supply.

• Press the key on the boiler for 5 seconds (part. 7 - fig. 1).

• The boiler is now ready to function automatically whenever there is a demand on the boiler.

In case of an electrical power failure while the boiler is working, the burner will go out. When
power returns, the boiler will run the self-test cycle again, after which the burner will automatically
re-ignite (if there is still a demand).

Checks during operation

• Check the tightness of the gas circuit and water systems.

• Check the efficiency of the flue and air-flue ducts while the boiler is working.

• Check that the water is circulating properly between the boiler and the system.

• Make sure that the gas valve modulates correctly.

• Check the proper ignition of the boiler by performing various tests, turning it on and off with the
room thermostat or remote control.

• Make sure that the gas rate indicated on the meter corresponds to that given in the technical data
table in section 4.4 page 35

Turning off

Press the key for 5 seconds (

part. 7 - fig. 1

).

27

OPTIMAX HE 31 C

3.3 Maintenance

The following operations are strictly reserved for Qualified Personnel, such as corgi registered
engineers or Ferroli engineers.

Seasonal inspection of the boiler and flue

It is advisable to carry out the following checks at least once a year:

• The control and safety devices (gas valve, flow meter, thermostats, etc.) must function correctly.

• The flue terminal and ducts must be free of obstructions and leaks.

• The gas and water systems must be sound.

• The burner and exchanger must be clean.

• The electrodes must be free of deposits and correctly positioned.

• The system pressure when cold must be approx 1 bar; otherwise, bring it to that value.

• The expansion vessel must be filled to 1 bar cold with zero system pressure.

• The gas flow and pressure must correspond to that given in table 10 section 4.4 page 35.

• The circulating pump must be vented and free of debris.

• The return filter cleaned.

• The condensate trap inspection bowl should be cleaned and free of debris.

28

OPTIMAX HE 31 C

Opening the casing

To open the boiler casing, you need to follow the sequence given below
and the instructions of fig. 29.

1 Using a screwdriver, fully unscrew and remove the 2 screws “A ”
2 Open by lowering the panel “B ”
3 Lift and take off the casing “C ”

C

e

c

c

o

o

m

f
o
r

reset

t

2

1

0

e

c

c

o

o
m
f

o

r

res

t

et

2

1

0

3

B
A
R

4

3

B
A
R

4

B

fig. 29

A

A

Cleaning the boiler and burner

The body and burner must not be cleaned with chemical products or wire brushes. Special care must
be taken over all the sealing systems pertaining to the sealed chamber (gaskets, cable clamps, etc.). In
addition, it is necessary to pay attention after performing all these operations to check and carry out all
the phases of ignition and thermostat operation, the gas valve and circulation pump.

After these checks, make sure there are no gas leaks.

Combustion analysis

It is possible to analyse the combustion through
the air and flue sampling points shown in fig.

16.
To make the measurement, it is necessary to:

1) Open the flue sampling point

2) Insert the probe;

3) Press CH button (part. 3, 4 - fig. 1) for

5 seconds to turn on TEST mode;

4) Wait 10 minutes for the boiler to stabilize

5) Take the measurement.

Flue Gas

Air

Air

Flue Gas

NAT GAS; CO2 reading should be 8.7 to 9.0%
L.P.G; CO2 reading should be 9.5 to 10%

Readings taken with an unstabilized boiler will cause measurement errors.

fig. 30

29

OPTIMAX HE 31 C

3.4 Troubleshooting

Fault Diagnosis

In the event of operating problems or trouble, the display will flash and a fault identification code
appears.

There are faults that in order to restore operation the RESET button must be pressed (ref.6 - fig. 1); or
if the boiler fails to start, it will be necessary to repair the fault (code nos. F1 to F24). Other faults cause
temporary shutdowns that are automatically reset as soon as the value comes back within the boiler’s
normal working range (codes from 25 to 47).

When the boiler starts functioning normally again, the display stops flashing and the fault code disap­pears.

Fault Possible cause Cure

No burner ignition No gas Check the regular gas fl ow to the boiler and the air

A01

Detection or ignition electrode fault Check that the electrodes are correctly positioned
Defective gas valve Check and change the gas valve

Incorrect inlet gas pressure Check inlet gas pressure
Siphon obstructed Check and if necessary change the siphon

has been purged from the pipes.
and free of any deposits

Flame detected with the burner off Ionisation electrode defective Check the ionizing electrode wiring

A02

High limit protection Flow temperature sensor not active

A03

Flue gas fault Fault F07 happened 3 times in the

A04

Fan problem Tachometer signal interrupted for 1

A05

No fl ame after the ignition phase (6

A06

times in 4 min.)

Flow sensor disconnected Sensor disconnected Check the correct position and operation of the fl ow

A41

Flue gas fault The exhaust gases temperature

F07

Flow sensor fault Sensor damaged or short circuited Check the wiring or change the sensor

F10

Main board defective Check the PCB

or correctly located
No system circulation Check the pump and radiator valves present in the

last 24 hours

hour or longer
Detection electrode fault Check that the electrode is correct positioned and if

Flame unstable Check the burner
Incorrect valve gas Offset Check Offset at the minimum power
Flue gas circuit obstructed Check if fl ue gas circuit is free
Siphon obstructed Check and if necessary change the siphon

becomes higher than 95°C for 2
minutes.

Sensor damaged or wiring broken Check the wiring or change the sensor

Check the correct positioning and operation of the
fl ow sensor

system
Check operation of the internal by-pass

Check the fl ue

Check the wiring and the fan

necessary change it

sensor
Check the fl ue

30

Return sensor fault Sensor damaged or wiring shorted Check the wiring or change the sensor

F11

Sensor damaged or wiring broken Check the wiring or change the sensor

OPTIMAX HE 31 C

Fault Possible cause Cure

Flue sensor fault Sensor damaged or wiring shorted Check the wiring or change the sensor

F13

Flow sensor fault Sensor damaged or short circuited Check the wiring or change the sensor

F14

Sensor damaged or wiring broken Check the wiring or change the

sensor

Sensor damaged or wiring broken Check the wiring or change the sensor

Fan problem Tachometer signal interrupted, fan

F15

Supply voltage under 180V. Electric supply problem Check the electrical system

F34

Irregular mains frequency Electric supply problem Check the electrical system

F35

Incorrect system water pressure Pressure too low Fill the system

F37

External probe fault Sensor damaged or short-circuited Check the wiring or change the sensor

F39

Incorrect system water pressure Pressure too high above 3 - 5 bar Check the fi ll loop not passing

F40

Flow sensor fault Sensor damaged Change the sensor

F42

connection
Fan damaged, debris in fan Check the fan, clean debris

Sensor damaged Check the sensor

Check the wiring and fan

Check the wiring and sensor
Check the safety valve
Check the expansion vessel

N/A for UK market Wiring interrupted Check the wiring

F47

Sensor damaged Replace the sensor

31

OPTIMAX HE 31 C

4. TECHNICAL CHARACTERISTICS AND
DATA

4.1 Dimensions and connections

94,7

120

120

65,3

156,2

400

215

91

185

Ø118

330

2

eco

1

3

comfort

reset

0

4

BAR

400

7

1 2 3 465

700

649

38

80

82,5

Ø3/4"

Ø1/2"

80,5

80

56

Ø3/4"

240

Ø1/2"

51

54

Ø1/2"

76

80,5

76,2

82,5

54

75

Key

1 System flow (22 mm with isolation valve fitted)
2 DHW outlet (15 mm)
3 Gas inlet (22 mm with isolation valve fitted)
4 Cold main inlet (15 mm with isolation valve fitted)

32

216,7

156,7

51

80,5

56

fig. 31

5 System return - 22 mm with isolation valve

fitted (c/w filter)

6 Pressure Relief Valve
7 Condense outlet

OPTIMAX HE 31 C

4.2 General view and main components

16

56

82

188

278

19

196

194

95

5 Room sealed compartment
7 Gas inlet
8 DHW outlet

29

9 Cold main inlet

191

10 CH flow
11 CH return

21

14 Heating safety valve
16 Premix fan assembly

201

19 Combustion-compartment

5

21 Main injector
22 Main burner
29 Internal flue collar

22

32 Heating pump
36 Automatic air vent
37 Cold water inlet filter
39 Cold water flow limiter
44 Gas valve

161

56 Expansion vessel
82 Ionisation electrode
95 Motorised Diverting valve
136 Flow meter
145 C.h. pressure gauge
154 Condensate outlet pipe

186

161 Heat exchanger

14

186 Return temperature sensor
188 Spark Electrode
191 Flue temperature sensor

36

194 Domestic plate Heat exchanger
196 Condensate collector
201 Fan Venturi

246

246 System pressure sensor
278 Double sensor (Safety + Heating

32

145

flow)

154

10 8 44 7 39 9 1363711

fig. 32

33

4.3 Hydraulic diagram

OPTIMAX HE 31 C

193

16

278

44

194

201

161

56

186

246
36

95

154

241

Key

7 Gas inlet
8 DHW outlet
9 Cold main inlet

10 CH flow
11 CH return
14 Heating Pressure Relief safety valve
16 Premix fan assembly
32 Heating pump
36 Automatic air vent
44 Gas valve
56 Expansion vessel

9

fig. 33

95 Motorised Diverting valve
136 Flow meter
154 Condensate outlet pipe
161 Heat exchanger

186 Return temperature sensor
193 Siphon
194 Domestic plate Heat exchanger
201 Fan Venturi
241 Automatic by-pass valve
246 System pressure sensor
278 Double sensor (Safety + Heating)

1110 78

14

32

136

34

OPTIMAX HE 31 C

4.4 Technical data table

Table 10

Powers

Hi Heating power

Hi DHW power

Useful Heating Power 80° C - 60° C
Useful Heating Power 50° C - 30° C

Useful DHW Power
Natural Gas delivery (G20)

Natural Gas supply pressure (G20)
LPG flow rate (G31)

LPG supply pressure (G31)

Combustion

Seasonal Efficiency (SEDBUK)

Pmax Pmin

kW 25,2 5,3

kW 31,5 5,3

kW 24,6 5,2
kW 26,6 5,7

kW 30,8 5,2

3

m

/h 3,33 0,56

mbar 20 20

kg/h 2,47 0,41

mbar 37 37

Pmax

Pmin

CO2 (G20 - Natural Gas) %
Gas nozzle (G20 - Natural Gas)
CO2 (G31 - Propane) %
Gas nozzle (G31 - Propane)
Flue temperature 80°C - 60°C °C
Flue temperature 50°C - 30°C °C
Flue flow rate kg/h
Quantity of condensate kg/h
pH of condensation water pH

Energy marking (92/42 EEC directive)
NOx emission class

Heating

Heating temperature adjustment range °C
Maximum working temperature in heating °C

Heating circuit PMS safety valve (preset) bar
Minimum working pressure in heating bar
Expansion vessel capacity litres

Expansion vessel pre-filling pressure bar
Total boiler water content litres

Hot water

Hot tap water supply Dt 25° C l/min

Hot tap water supply Dt 30° C l/min
Hot tap water supply Dt 35° C l/min
Tap water temperature adjustment range °C
Maximum working pressure in hot water production bar
Minimum working pressure in hot water production bar

Dimensions, weights connections

Height mm
Width mm
Depth mm
Weight empty kg
Gas system connection (with isolation valve fitted) mm
Heating system connections (with isolation valve fitted) mm
Hot water circuit connections (with isolation valve fitted) mm

Maximum length of separate flues D=80*

(*Measurement given in equivalent linear metres  cfr FERROLI calculation system)

m

Electrical power supply

Max electrical power absorbed
Electric power drawn by the circulator (Speed I-II-III) W
Electrical protection rating IP

Power voltage/frequency V/Hz

W

9,0

10

65
46
43

3,3

eq

60-65-70

8,7

5,6

9,5

4,2

60
31
13

1,4

4,1

5

20 - 90

95

3

0.8
7

1

1,5

17,6

14,7
12,6

40 - 55

9

0.25

700
400
330

39
Ø22
Ø22
Ø15

75

135

X5D

230/50

35

4.5 Diagrams

0

1

2

3

4

5

6

7

0 500 1.000 1.500 2.000

Q [l/h]

H [m H

2

O]

A

3

2

1

Head available for the system

OPTIMAX HE 31 C

fig. 34

Key

1 - 2 - 3 = Pump selector positions

(In order to obtain maximum hot water output the pump must be left in position 3).

A = Boiler losses of head

36

OPTIMAX HE 31 C

4.6 Wiring diagram

fig. 35

Key

16 Fan
32 Central heating pump
44 Combination gas valve
62 Time clock (optional)
72 Room thermostat
81 Spark Electrode
82 Ionisation electrode
95 Diverting valve
101 Main p.c.b.
104 Fuse

136 Flowmeter
138 Outside temperature sensor
139 Room unit
186 Return temperature sensor
191 Flue temperature sensor
202 Transformer 230V-24V
203 230v A/C switched supply
246 System pressure sensor
278 Double sensor (Safety + Heating)

37

BENCHMARK

BENCHMARK No.

Please add the first 4 digits of the Boiler serial No to complete the BENCHMARK No.

267

COLLECTIVE MARK

GAS BOILER COMMISSIONING CHECKLIST

BOILER SERIAL No. NOTIFICATION No.

CONTROLS To comply with the Building Regulations, each section must have a tick in one or other of the boxes

TIME & TEMPERATURE CONTROL TO HEATING ROOM T/STAT & PROGRAMMER/TIMER PROGRAMMABLE ROOMSTAT

TIME & TEMPERATURE CONTROL TO HOT WATER CYLINDER T/STAT & PROGRAMMER/TIMER

HEATING ZONE VALVES FITTED NOT REQUIRED

HOT WATER ZONE VALVES FITTED NOT REQUIRED

THERMOSTATIC RADIATOR VALVES FITTED

AUTOMATIC BYPASS TO SYSTEM FITTED NOT REQUIRED

COMBI BOILER

FOR ALL BOILERS CONFIRM THE FOLLOWING

THE SYSTEM HAS BEEN FLUSHED IN ACCORDANCE WITH THE BOILER MANUFACTURER’S INSTRUCTIONS?

THE SYSTEM CLEANER USED

THE INHIBITOR USED

FOR THE CENTRAL HEATING MODE, MEASURE & RECORD

GAS RATE ft3/hr

BURNER OPERATING PRESSURE (IF APPLICABLE) mbar

CENTRAL HEATING FLOW TEMPERATURE °C

CENTRAL HEATING RETURN TEMPERATURE °C

m3/hr

N/A

FOR COMBINATION BOILERS ONLY

HAS A WATER SCALE REDUCER BEEN FITTED? YES NO

WHAT TYPE OF SCALE REDUCER HAS BEEN FITTED?

FOR THE DOMESTIC HOT WATER MODE, MEASURE & RECORD

GAS RATE ft3/hr

MAXIMUM BURNER OPERATING PRESSURE (IF APPLICABLE) mbar

COLD WATER INLET TEMPERA

HOT WATER OUTLET TEMPERATURE °C

WATER FLOW RATE

TURE °C

m

N/A

3

/hr

FOR CONDENSING BOILERS ONLY CONFIRM THE FOLLOWING

THE CONDENSATE DRAIN HAS BEEN INSTALLED IN ACCORDANCE WITH
THE MANUFACTURER’S INSTRUCTIONS? YES

FOR ALL INSTALLATIONS CONFIRM THE FOLLOWING

THE HEATING AND HOT WATER SYSTEM COMPLIES
WITH CURRENT BUILDING REGULATIONS

THE APPLIANCE AND ASSOCIATED EQUIPMENT HAS BEEN INSTALLED AND COMMISSIONED
IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS

IF REQUIRED BY THE MANUFACTURER, HAVE YOU RECORDED A CO/CO2 RATIO READING? N/A YES CO/CO2 RATIO

THE OPERATION OF THE APPLIANCE AND SYSTEM
CONTROLS HAVE BEEN DEMONSTRATED TO THE CUSTOMER

THE MANUFACTURER’S LITERATURE HAS BEEN LEFT WITH THE CUSTOMER

lts/min

COMMISSIONING ENG’S NAME PRINT CORGI ID No.

SIGN DATE

SERVICE INTERVAL RECORD

It is recommended that your heating system is serviced regularly

and that you complete the appropriate Service Interval Record Below.

Service Provider. Before completing the appropriate Service Interval Record below, please ensure you have carried out the service

as described in the boiler manufacturer’s instructions. Always use the manufacturer’s specified spare part when replacing all controls

SERVICE 1

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 3

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 5

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

DATE

DATE

DATE

SERVICE 2

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 4

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 6

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

DATE

DATE

DATE

SIGNATURE

SERVICE 7

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

SERVICE 9

ENGINEER NAME

ANY NAME

COMP

No.

TEL

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

DATE

TE

DA

SIGNATURE

SERVICE 8

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

TURE

SIGNA

SERVICE 10

ENGINEER NAME

COMPANY NAME

TEL No.

CORGI ID CARD SERIAL No.

COMMENTS

SIGNATURE

DATE

DATE

FERROLI TECHNICAL HELPLINE - 08707 282 885

Should you require any assistance during the installation

Should you require a service engineer to visit

Phone numbers:

Installer

Service Engineer

call our Technical Service Helpline on

08707 282 885 option 1

call our service centre on

08707 282 885 option 2

(For U.K. and Northern Ireland)

For EIRE only call HEATOVENT on

014508166

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

ALL SPECIFICATIONS SUBJECT TO CHANGE

Please note - to avoid incurring unnecessary expense, in the event of a boiler shut down, check

this is not caused by lack of electricity supply, gas supply or low water pressure before calling our

Customer Service Helpline.

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

Tel. [phone] - Fax [phone]

EIRE only:

HEATOVENT Greenhills Industrial Estate,

Greenhills Road, Walkinstown, Dublin 12, IRELAND

Tel [phone] - Fax [phone]