Ariston GENUS 27 RFFI SYSTEM Operating instructions

Ariston GENUS 27 RFFI SYSTEM Operating instructions
Installation
Instructions
Type C Boilers
G.C.N: 41-116-03
47-116-17
Condensing
LEAVE THESE INSTRUCTIONS
WITH THE END-USER
Country of destination: GB
275
TABLE OF CONTENTS
1. GENERAL INFORMATION
1.
This manual is an integral and essential part of the product. It should
be kept with the appliance so that it can be consulted by the user and
our authorised personnel.
GENERAL INFORMATION
1.1.
1.3.
2.
GENERAL INFORMATION
OVERALL VIEW
INSTALLATION
2.1.
2.2.
2.3.
2.4.
2.5.
2.6.
2.7.
2.8.
2.9.
2.10.
2.10.1.
2.10.2.
2.10.3.
2.10.4.
2.10.5.
2.11.
2.12.
3.
COMMISSIONING
3.1.
3.2.
3.3.
3.4.
3.5.
3.6.
3.6.1.
3.6.2.
3.6.3.
3.7.
3.7.1.
3.7.2.
3.7.3.
3.7.4.
3.7.5.
3.7.6.
3.8.
3.9.
3.10.
4.
4.3.1.
4.3.2.
4.4.
4.5.
6.
2
OVERALL VIEW
PRELIMINARIES
GAS REGULATION
TEST OF THE CONNECTION PRESSURE
REGULATION OF THE THERMAL POWER
CHANGING THE TYPE OF GAS
OPERATING TESTS
ZONE VALVES
MAINTENANCE
6.1.
6.2.
6.3.
6.4.
7.
INITIAL PROCEDURES
REMOVING THE CASING
CONTROL PANEL
INITIAL START-UP
DISPLAY: MESSAGES SHOWN DURING
NORMAL OPERATION
OPERATING PARAMETERS
CONTROL MODES
OUTDOOR SENSOR
SETTINGS DISPLAY
REGULATIONS
POTENTIOMETER
SETTING THE TEMPERATURE FIELD
COMFORT KEY/HEATING ONLY
POST-CIRCULATION OF THE PUMP
TEST MODE
REGULATION MENU TABLE
BOILER SAFETY SYSTEMS
COMBUSTION ANALYSIS
DRAINING
GAS ADJUSTMENTS
4.1.
4.2.
4.3.
5.
REFERENCE STANDARDS
SITING THE APPLIANCE
OVERALL DIMENSIONS
MINIMUM CLEARANCES
MOUNTING THE APPLIANCE
ELECTRICAL CONNECTION
GAS CONNECTION
WATER CONNECTIONS
FLUE CONNECTIONS
ACCESSORY CONNECTION
ROOM THERMOSTAT CONNECTION
REMOTE CONTROL CONNECTION
ACCESSORY CONNECTION TERMINAL BLOCK
CYLINDER TEMPERATURE PROBE CONNECTION
REMOTE CONTROL TERMINAL BLOCK AND
CYLINDER PROBE
ELECTRICAL DIAGRAM
WATER CIRCUIT DIAGRAMS
GENERAL REMARKS
CLEANING THE PRIMARY EXCHANGER
CLEANING THE CONDENSATE TRAP
OPERATIONAL TEST
Please carefully read the instructions and notices about the unit
contained in this manual, as they provide important information
regarding the safe installation, use and maintenance of the product.
For operating instructions please consult the separate User’s Manual.
1.1.
GENERAL INFORMATION
Read the instructions and recommendations in these Installation
Instructions carefully to ensure proper installation, use and
maintenance of the appliance.
Keep this manual in a safe place. You may need it for your own
reference while our Servicing Centre technicians or your installer
may need to consult it in the future.
This is a combined appliance for the production of central heating
(C.H.) and domestic hot water (D.H.W.).
This appliance must be used only for the purpose for which it is
designed.
The manufacturer declines all liability for damage caused by
improper or negligent use.
No asbestos or other hazardous materials have been used in the
fabrication of this product.
Before connecting the appliance, check that the information shown
on the data plate and the table on pages 4-5 comply with the electric,
water and gas mains of the property. You will find the data plate on
the reverse of the control panel.
The gas with which this appliance operates is also shown on the
label at the bottom of the boiler.
Do not install this appliance in a damp environment or close to
equipment which spray water or other liquids.
Do not place objects on the appliance.
Do not allow children or inexperienced persons to use the appliance
without supervision.
If you smell gas in the room, do not turn on light switches, use the
telephone or any other object which might cause sparks.
Open doors and windows immediately to ventilate the room.
Shut the gas mains tap (on the gas meter) or the valve of the gas
cylinder and call your Gas Supplier immediately.
If you are going away for a long period of time, remember to shut the
mains gas tap or the gas cylinder valve.
Always disconnect the appliance either by unplugging it from the
mains or turning off the mains switch before cleaning the appliance
or carrying out maintenance.
In the case of faults or failure, switch off the appliance and turn off
the gas tap. Do not tamper with the appliance.
For repairs, call your local Authorised Servicing Centre and request
the use of original spare parts. For in-guarantee repairs contact MTS
(GB) Limited
TECHNICAL INFORMATION
275
1.3.
OVERALL VIEW
LEGEND:
1.
Flue connector
2.
Heating flow temperature probe
3.
Mixer
4.
Condensate collector
5.
Expansion vessel
6.
Condensate trap (tube)
7.
Condensate trap
8.
Diverter valve
9.
Main circuit flow switch
10. Domestic hot water temperature probe
11. Control panel
12. Gas valve
13. Domestic hot water flow switch
14. Drain valve
15. Safety valve (3 bar)
16. Secondary heat exchanger
17. Circulation pump with automatic air release valve
18. Heating return temperature probe
19. Sealed combustion chamber
20. Combustion chamber inspection hatch
21. Fan
22. Ignition and detection electrode
23. Main heat exchanger (aluminium)
24. Automatic by-pass
25. Silencer
24 MFFI
2. INSTALLATION
The technical information and instructions provided herein below are
intended for the installer so that the unit may be installed correctly
and safely.
2.1.
24 RFFI SYSTEM
REFERENCE STANDARDS
The installation and initial start-up of the boiler must be by a CORGI
Approved Installer in compliance with the installation standards
currently in effect, as well as with any and all local health and safety
standards i.e. CORGI.
This appliance must be installed by a competent installer in
accordance with the current Gas Safety (installation & use)
Regulations.
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 byelaws of the local water authority, and in Scotland,
in accordance with the Building Standards (Scotland) Regulation and
Health and Safety document No. 635 “Electricity at work regs. 1989”.
Installation should also comply with the following British Standard
Codes of Practice:
Low pressure
pipes
BS 6891
Boilers of rated input
not exceeding 60 kW
BS 6798
Forced circulation hot
water system
BS 5449
Installation of gas hot water
supplies for domestic purposes
BS 5546
( 2nd family gases)
Flues
BS 5440-1
Air supply
BS 5440-2
1988
1987
1990
1990
1990
1989
FIG. 1.1
275
3
2.2.
SITING THE APPLIANCE
The appliance may be installed in any room or indoor area, although
particular attention is drawn to the requirements of the current I.E.E.
Wiring Regulations, and in Scotland, the electrical provisions of the
Building Regulations applicable in Scotland, with respect to the
installation of the combined appliance in a room containing a bath or
shower.
Where a room-sealed appliance is installed in a room containing
a bath or shower the boiler and any electrical switch or
appliance control, utilising mains electricity should be situated
so that it cannot be touched by a person using the bath or
shower.
The location must permit adequate space for servicing and air
circulation around the appliance as indicated in paragraph 2.4.
The location must permit the provision of an adequate flue and
termination.
For unusual locations special procedures may be necessary.
BS 6798-1987 gives detailed guidance on this aspect.
A compartment used to enclose the appliance must be designed
specifically for this purpose. No specific ventilation requirements are
needed for an installation within a cupboard.
This appliance is not suitable for outdoor installation.
The type C appliances (in which the combustion circuit, air vent
intake and combustion chamber are air-tight with respect to the
room in which the appliance is installed) can be installed in any
type of room.
There are no limitations with respect to ventilation and the volume of
the room itself. The boiler must be installed on a solid, permanent
wall to prevent access to the electrical parts (when live) through the
aperture on the back frame.
2.3.
OVERALL DIMENSIONS
LEGEND:
A = Central Heating Flow (3/4”)
B = Domestic Hot Water Outlet (1/2”)
C = Gas Inlet (3/4”)
D = Domestic Cold Water Inlet (1/2”)
E = Central Heating Return (3/4”)
F = Cylinder Flow (3/4”)
G = Cylinder Return (3/4”)
H = Condensate discharge
FIG. 2.1
24 MFFI
=
=
181
100
20
65
67
67
65
155 (A-B-D-E)
208 (C)
24 RFFI SYSTEM
4
275
2.4.
MINIMUM CLEARANCES
FIG. 2.3
In order to allow for access to the interior of the boiler for
maintenance purposes, the boiler must be installed in compliance
with the clearance requirements indicated in the diagram below.
FIG. 2.2
24 MFFI
IMPORTANT!
In the event that the power supply cable must be changed, replace it
with one with the same specifications. Make the connections to the
terminal board located within the control panel, as follows:
- The yellow-green wire should be connected to the terminal marked
with the earth symbol; make sure to re-use the ferrule mounted on
the other supply cord;
- The blue wire should be connected to the terminal marked “N”;
- The brown wire should be connected to the terminal marked “L”.
Note: The diagrams for the electrical system are indicated in section
2.11.
Warning, this appliance must be earthed.
External wiring to the appliance must be carried out by a qualified
technician and be in accordance with the current I.E.E. Regulations
and applicable local regulations. The Genus range of boilers are
supplied for connection to a 230 V~ 50 Hz supply.
24 MFFI SYSTEM
The supply must be fused at 3 A.
The method of connection to the electricity supply must facilitate
complete electrical isolation of the appliance, by the use of a fused
double pole isolator having a contact separation of at least 3 mm in
all poles or alternatively, by means of a 3 A 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 appliance unless the appliance is
installed in a bathroom when this must be sited outside the
bathroom.
2.7.
GAS CONNECTION
The local gas region contractor connects the gas meter to the
service pipe.
If the gas supply for the boiler serves other appliances ensure that an
adequate supply is available both to the boiler and the other
appliances when they are in use at the same time.
Pipe work must be of an adequate size. Pipes of a smaller size than
the boiler inlet connection should not be used.
2.5.
MOUNTING THE APPLIANCE
Fasten the boiler in place using the template and anchors supplied
with the unit. It is highly recommended that a spirit level be used to
position the boiler so that it is perfectly level.
For additional information, please consult the instructions contained
in the connection kit and the flue kit.
2.6.
ELECTRICAL CONNECTION
For safety purposes, have a competent person carefully check the
electrical system in the property, as the manufacturer will not be held
liable for damage caused by the failure to earth the appliance
properly or by anomalies in the supply of power. Make sure that the
residential electrical system is adequate for the maximum power
absorbed by the unit, which is indicated on the rating plate. In
addition, check that the section of cabling is appropriate for the
power absorbed by the boiler.
The boiler operates with alternating current, as indicated in the
technical data table (1.2), where the maximum absorbed power is
also indicated. Make sure that the connections for the neutral and live
wires correspond to the indications in the diagram. The appliance
electrical connections are situated on the reverse of the control panel
(see the servicing manual for further information)
275
5
2.8.
WATER CONNECTIONS
FIG. 2.5
VIEW OF THE BOILER CONNECTIONS
24 MFFI
C
A
B
D
E
I
H
FIG. 2.4
24 MFFI SYSTEM
C
A
D
E
I
F
G
H
LEGEND:
A
B
C
D
E
F
G
H
I
=
=
=
=
=
=
=
=
=
Central Heating Flow
Domestic Hot Water Outlet
Gas Inlet
Domestic Cold Water Inlet)
Central Heating Return
Cylinder Flow
Cylinder Return
Condensate discharge
Safety valve discharge
CENTRAL HEATING
Detailed recommendations are given in BS 6798:1987 and BS 54491:1990, the following notes are given for general guidance.
PIPE WORK:
Copper tubing to BS EN 1057:1996 is recommended for water
pipes. Jointing should be either with capillary soldered or
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, however
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 avoid freezing.
Particular attention should be paid to pipes passing through
ventilated spaces in roofs and under floors.
BY-PASS:
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.
6
Fitting the connection kit to
the ecoGENUS 24 RFFI
SYSTEM only.
It will be noted that the kit has
two connections not required
for this boiler i.e. the domestic
cold inlet “D” and the domestic
hot water outlet “B” (see fig.
2.4).
Although the cold water main supply must be connected to the
isolation valve for the purpose of operating the filling-loop, the
isolation valve is NOT connected to the boiler and should be left
in the OFF position.
The D.H.W. outlet is capped-off on the boiler, therefore not
requiring the isolation valve to be used.
The ecoGENUS 24 RFFI SYSTEM has 2 x 3/4" B.S.P. male
threads for the cylinder flow and return. It is recommended that 2
x 22mm x 3/4" female iron fittings (not supplied) be used on these
connections (using P.T.F.E. tape), before the boiler is mounted on
the wall.
SYSTEM DESIGN:
This boiler is suitable only for sealed systems.
DRAIN COCKS:
These must be located in accessible positions to permit the
draining of the whole system. The taps must be at least 15mm
nominal size and manufactured in accordance with BS
2870:1980.
SAFETY VALVE DISCHARGE:
The discharge should terminate facing downwards on the exterior
of the building in a position where discharging (possibly boiling
water & steam) will not create danger or nuisance, but in an easily
visible position, and not cause damage to electrical components
and wiring.
The discharge must not be over an entrance or a window or any
other type of public access.
CONDENSATE DISCHARGE:
The condensate discharge hose from the boiler must be inserted
by at least 50 mm into a suitable acid resistant pipe - e.g. plastic
waste or overflow pipe. The condensate discharge pipe must have
a continuous fall and preferably be installed and terminated within
the building to prevent freezing.
The discharge pipe must be terminated in a suitable position:
i) Connecting in to an internal soil stack (at least 450 mm above
the invert of the stack). A trap giving a water seal of at least 75
mm must be incorporated into the pipe run , there also must
be an air break upstream of the trap.
ii) Connecting into the waste system of the building such as a
washing machine or sink. The connection must be upstream of
the washing machine/sink (If the connection is down stream of
the waste trap then an additional trap giving a minimum water
seal of 75 mm and an air break must be incorporated in the
pipe run, as above.
iii) Terminating into a gully, below the grid level but above the
water level.
iv) Into a soakway.
NOTE: If any condensate pipe work is to be installed externally,
then it should be kept to a minimum and be insulated with a
waterproof insulation and have a continuous fall.
AIR RELEASE POINTS:
These must be fitted at all high points where air naturally collects
and must be sited to facilitate complete filling of the system.
The appliance has an integral sealed expansion vessel to
accommodate the increase of water value when the system is
heated.
It can accept up to 7 l (1.5 gal) of expansion water. If the heating
circuit has an unusually high water content, calculate the total
275
expansion and add an additional sealed expansion vessel with
adequate capacity.
MAINS WATER FEED - CENTRAL HEATING:
There must be no direct connection to the mains water supply
even through a non-return valve, without the approval of the Local
Water Authority.
FILLING:
A temporary method for initially filling the system and replacing
lost water during servicing and initial filling (in accordance with
Water Supply Byelaw 14), is provided as an integral part of the
connection kit (see FIG. 2.5). The flexible hose must be removed
once the system has been filled. The D.H.W. inlet valve on the
connection kit has two positions, one for winter and one for the
summer. This enables the flow-rate through the appliance to be
adjusted so that a sensible D.H.W. temperature may be achieved
throughout the year.
The minimum acceptable spacing from the terminal to obstructions
and ventilation openings are specified in Fig. 2.6
FIG. 2.6
DOMESTIC WATER
The domestic water must be in accordance with the relevant
recommendation of BS 5546:1990. Copper tubing to BS EN
1057:1996 is recommended for water carrying pipe work and
must be used for pipe work carrying drinking water.
RESIDUAL HEAD OF THE BOILER
TERMINAL POSITION
mm
ABCDEFGHIJ-
Directly below an open window or other opening
Below gutters, solid pipes or drain pipes
Below eaves
Below balconies or car-port roof
From vertical drain pipes and soil pipes
From internal or external corners
Above ground or below balcony level
From a surface facing a terminal
From a terminal facing a terminal
From an opening in the car port
(e.g. door, window) into dwelling
K - Vertically from a terminal in the same wall
L - Horizontally from a terminal in the same wall
2.9.
FLUE CONNECTIONS
FLUE SYSTEM
The provision for satisfactory flue termination must be
made as described in BS 5440-1.
The appliance must be installed so that the flue terminal is
exposed to outdoor air.
The terminal must not discharge into another room or
space such as an outhouse or lean-to.
It is important that the position of the terminal allows a
free passage of air across it at all times.
The terminal should be located with due regard for the
damage or discolouration that might occur on buildings in
the vicinity.
In cold or humid weather water vapour may condense on
leaving the flue terminal.
The effect of such “steaming” must be considered.
If the terminal is less than 2 metres above a balcony,
above ground or above a flat roof to which people have
access, then a suitable terminal guard must be fitted.
When ordering a terminal guard, quote the appliance
model number.
A suitable terminal guard is available from:
TOWER FLUE COMPONENTS
Morley Road
Tonbridge
Kent TN9 1RA
275
300
75
200
200
75
300
300
600
1200
1200
1500
300
In FIG. 2.11 below, several different types of flue systems are shown.
For additional information regarding the flue accessories, please
consult the Flue Pipe Accessories manual.
Exhaust Type
Maximum Extension Diameter
of Pipes
Exhaust/Air
(mm)
(m)
C13
4
Ø 60/100
B33 outlet of fumes in
4
Ø 60/100
C13, C33, C43
31 (S1=S2)
Ø 80/80
C53, C83
55 (S1+S2)
Ø 80/80
B23
54 (S2)
Ø 80
Coaxial
Systems
chimney or exhaust flue
Twin Pipe
Systems
7
FIG. 2.11
1
2.10.
ACCESSORY CONNECTION
B
To carry out the connection for the roomstat or the outdoor sensor,
proceed as follows:
D
C
A
2.10.1. ROOM THERMOSTAT CONNECTION
2
1.
2.
Unscrew the screws “A” and rotate the control panel forwards;
Insert the connection cable for the thermostat or the outdoor
sensor into the cable gland “B” and open the lid of the control
panel after having first unscrewed fastening screws “C”.
3. Insert the connecting cable into the cable clamp “D” shown in
the figure and fasten it.
4. Remove the grommet “E” shown in the figure, make a hole in it
and pass the connecting cable for the roomstat or the outdoor
sensor through it.
5a. In order to connect up the roomstat, remove the link that is
located in the “F” terminal (marked with the initials “TA”) and
connect the cables.
5b. To connect up the outdoor sensor, insert the cables into the “G”
clamp (marked with the initials “SE”).
6. Return the grommet “E” to its initial position, then close back
the lid and lastly return the control panel to its place.
7 If a remote time clock is to be fitted, disconnect the integral time
clock plug from the P.C.B.
8 Using a volt-free switching time clock, connect the switching
wires from the time clock following points 1-6 above.
9 If using a time clock and room thermostat, these must be
connected in series as per points 1-8 above.
Note: Only a two-wire type room thermostat can be used.
E
3
F
G
4
E
For details on fitting the D.H.W. probe (ecoGENUS 27
RFFI only), please consult the separate instruction
sheet supplied with the probe.
An anti-frost device is built-in to the appliance’s
electronic regulation system.
8
275
2.10.2. REMOTE CONTROL CONNECTION
2.10.3. ACCESSORY CONNECTION TERMINAL BLOCK
Refer to the illustrations in section 2.10.1.
1.
2.
3.
4.
5.
Unscrew the screws “A” and rotate the control panel forwards.
Insert the connecting cables of the remote control into the cable
gland “B” and open the lid of the control panel after having
unscrewed the fastening screws “C”.
Remove a blind grommet, make a hole in it and pass the
connecting cable of the remote control through it.
Connect the cables of the remote control to the flying lead (see
section 2.11.) connected to position C5 on the P.C.B. (positions
with no closed jumper).
Bring the grommet back to its initial position, then close the lid
and lastly the control panel.
NOTE: The wiring of the RC must be done by using 2 x 0.5 mm2 cable
this guarantees a maximum length of 500 m.
The “BUS” cable of the RC must be wired separately from the 230
VAC cable.
NOTE: The wiring of the Outdoor Sensor (SE) must be done by using
2 x 0.5 mm2 cable this guarantees a maximum length of 50 m.
The sensor must be positioned at least 2 - 2.5 m above the
ground and where possible facing north. The sensor must not
be exposed to direct sunlight.
2.10.4. UNDER FLOOR HEATING CONNECTION
Refer to the illustrations in section 2.10.1.
1.
2.
3.
4.
5.
6.
Unscrew the screws “A” and rotate the control panel forwards.
Insert the connecting cable of the under floor heating sensor into
the cable gland “B” and open the lid of the instrument panel
after having unscrewed the fastening screws “C”.
Remove a blind grommet, make a hole in it and insert the
connecting cable of the under floor heating sensor through it.
Remove the jumper located in the flying clamp
Connect the cables of the under floor heating sensor to the flying
clamp connected to position C6 on the P.C.B. (in place of the
position previously occupied by the jumper).
Bring the grommet back to its initial position, close the lid and
lastly the control panel.
2.10.5. REMOTE CONTROL TERMINAL BLOCK,
CYLINDER PROBE AND SECONDARY OUTLET
CONNECTIONS TO THE P.CB.
C6 (3-11)
(grey)
275
JUMPER:
UNDER FLOOR
HEATING
SENSOR
C5 (1-2)
(red)
REMOTE CONTROL
C7 (1-9)
(violet)
SECONDARY OUTLET
(LPG valve,
secondary pump)
9
2.11.
ELECTRICAL DIAGRAM
LEGEND:
A: JUMPER
When needed, the P.C.B. allows the different options to be selected
by means of a wire link.
The boiler has the following basic arrangement:
1 OPEN
2 CLOSED (jumper)
3 OPEN
4 OPEN
5 OPEN
6 OPEN
7 CLOSED
8 OPEN (MFFI); CLOSED (SYSTEM)
NOTE: under absolutely no circumstances must jumpers 2, 7 and 8
be removed. The opening of such contacts will lead to boiler
malfunction.
This is the factory configuration. It is recommended that this set-up
not be changed, unless under the following particular circumstances:
JUMPER 3:
if the contact is closed, the Secondary Output (flying
clamp connected to connection C7; positions 1-9)
controls an LPG valve (optional).
JUMPER 4:
if the contact is closed, the continuous operation of
the pump is selected. If the contact remains open, it
has no effect and there is no change in the
operation of the boiler.
JUMPER 5:
if the contact is closed, the signal transmitted by the
connection of the secondar y output clasp
(connected to C7; positions 1-9) relates to a
secondary pump (optional). If the contact remains
open, the output signal controls a zone valve
(optional).
JUMPER 6:
not used
JUMPER 7/8:
7
N.I.
I.
N.I.
I.
8
N.I.
N.I.
I.
I.
CONFIGURATION
Central heating only
MFFI
Not used
RFFI System
I = inserted (contact closed)
N.I = not inserted (contact open)
N OTE : it is essential that the operations involving setting of the
jumpers be carried out only with the device turned off.
10
The P.C.B. is fitted with 2 fuses, on the
live and the neutral.
The fuse holder contains:
- 5 x 20mm “3.15A Slow” glass fuses
B:
C:
D:
E:
F:
G:
H:
I:
J:
K:
L:
M:
N:
O:
P:
Q:
R:
S:
T:
U:
V:
X:
W:
Control microprocessor
Flame detection jumper (under no circumstances should this
jumper be moved from the 1-2 position)
Anti-cycling device (RA)
Maximum heating output regulation (PR)
Soft-light regulation (RLA)
Operating mode selector knob
Heating temperature adjustment
Domestic hot water temperature adjustment
Remote control module
Main microprocessor
Relay
Fuses (2 x 0.54 A SLOW)
Transformer (PRI: 230V-50Hz; SEK: 10V-0,8VA; SEK:10V-3,5VA;
SEK:10V-3,5VA;)
Fuses (2 x 3.15 A SLOW)
Earth
Spark generator
Connection to the main P.C.B.
Comfort light
Programming keys
Comfort key
Alpha-numeric display
Set and reset key
Connection to PC
C1 = FAN
1:
“Hall” sensor power supply 12V (red)
2:
“Hall” sensor ground (blue)
3:
Not used
4:
Start of coil (black)
5:
“Hall” sensor input (white)
6:
End of coil (brown)
C2 = POWER SUPPLY
1:
Earth (yellow/green)
2:
Earth (yellow/green)
3:
Not connected
4:
Neutral (blue)
5:
Not connected
6:
Live (brown)
275
2.12. WATER CIRCUIT DIAGRAMS
C3 = CONNECTION TO ROOMSTAT
1:
Input - 1
2:
Input - 2
24 MFFI
C4 = TIMER
1:
3 V output
2:
Timer ground
3:
Timer output
4:
Not connected
C5 = REMOTE CONTROL (Bus+/Bus-)
1:
Input/output-1
2:
Input/output-2
C6 = SENSOR CONNECTOR
1:
Domestic hot water flow switch (grey)
2:
Main circuit flow switch (grey)
3:
Under floor heating thermostat (grey)
4:
Heating flow sensor (grey)
5:
Heating return sensor (grey)
6:
Domestic hot water sensor (grey)
7:
Not used: jumper
8:
Outdoor sensor (grey)
9:
Domestic hot water flow switch (grey)
10:
Main circuit flow switch (grey)
11:
Under floor heating thermostat (grey)
12:
Flow sensor (grey)
13:
Heating sensor (grey)
14:
Domestic hot water sensor (grey)
15:
Not used: under floor heating
16:
Outdoor sensor (grey)
C7 = EQUIPMENT CONNECTIONS
1:
Secondary output (optional)
2:
Gas valve (white)
3:
3-way valve neutral (white)
4:
Pump (white)
5:
Ionisation (black)
6:
Not connected
7:
Ground
8:
Pump earth (yellow/green)
9:
Secondary output (optional)
10:
Gas valve (brown)
11:
3-way valve (domestic hot water) (brown)
12:
3-way valve (heating) (brown)
13:
Pump (brown)
14:
Not connected
15:
Earth
16:
Gas valve earth (yellow/green)
275
LEGEND:
1 - Fan
2 - Main Heat exchanger
3 - Ignition/detection electrode
4 - Burner
5 - Gas valve
6 - Heating return temperature probe
7 - Heating flow temperature probe
8 - Silencer
9 - Motorised valve
10 - Automatic by-pass
11 - Main circuit flow switch
12 - Domestic hot water temperature probe
13 - Secondary heat exchanger
14 - Domestic hot water inlet filter
16 - Drain valve
17 - Safety valve
18 - Pressure gauge
19 - Circulation pump with automatic air release valve
20 - Expansion vessel
21 - Condensate trap inspection cap
22 - Condensate trap
23 - Condensate discharge tube
24 - Condensate trap inlet
25 - Injector
26 - Domestic hot water flow switch
11
24 RFFI SYSTEM
3. COMMISSIONING
3.1.
INITIAL PREPARATION
MTS (GB) Limited support the
initiative. Within the
information pack you will find a copy of the
logbook. It is
important that this is completed in the presence of your customer,
they are shown how to us it, and it is signed by them. Please instruct
your customer that they must have their
logbook with them
whenever they contact a service engineer or us.Preliminary electrical
system checks to ensure electrical safety must be carried out by a
competent person i.e. polarity, earth continuity, resistance to earth
and short circuit.
FILLING THE HEATING SYSTEM:
Remove the panels of the case and lower the control panel (see
section 3.2. for further information).
Open the central heating flow and return cocks supplied with the
connection kit.
Unscrew the cap on the automatic air release valve one full turn
and leave open permanently.
Close all air release valves on the central heating system.
Gradually open valve(s) at the filling point (filling-loop) connection
to the central heating system until water is heard to flow, do not
open fully.
Open each air release tap starting with the lower point and close it
only when clear water, free of air, is visible.
Purge the air from the pump by unscrewing the pump plug
and also manually rotate the pump shaft in the direction
indicated by the pump label to ensure the pump is free.
Close the pump plug.
Continue filling the system until at least 1 bar registers on the
pressure gauge.
Inspect the system for water soundness and remedy any leaks
discovered.
FILLING OF THE D.H.W. SYSTEM:
Close all hot water draw-off taps.
Open the cold water inlet cock supplied with the connection kit.
Open slowly each draw-off tap and close it only when clear water,
free of bubbles, is visible
LEGEND:
1 - Fan
2 - Main Heat exchanger
3 - Ignition/detection electrode
4 - Burner
5 - Gas valve
6 - Heating return temperature probe
7 - Heating flow temperature probe
8 - Silencer
9 - Motorised valve
10 - Automatic by-pass
11 - Main circuit flow switch
12 - Non-return valve (integral to Jig Kit)
13 - Filling loop (integral to Jig Kit)
14 - Indirect cylinder expansion vessel
15 - Expansion relief valve
16 - Drain valve
17 - Safety valve (3 bar)
18 - Pressure gauge
19 - Circulation pump with automatic air release valve
20 - Expansion vessel
21 - Condensate trap inspection cap
22 - Condensate trap
23 - Condensate discharge tube
24 - Condensate trap inlet
25 - Injector
12
GAS SUPPLY:
Inspect the entire installation including the gas meter, test for
soundness and purge, all as described in BS 6891:1988.
Open the gas cock (supplied with the connection kit) to the
appliance and check the gas connector on the appliance for leaks.
When the installation and filling are completed turn on the central
heating system (sect. 3.4) and run it until the temperature has
reached the boiler operating temperature.
The system must then be immediately flushed through.
The flushing procedure must be in line with BS 7593:1992 Code of
practice for treatment of water in domestic hot water central heating
systems.
During this operation, we highly recommend the use of a central
heating flushing detergent (Fernox Superfloc or equivalent), whose
function is to dissolve any foreign matter that may be in the system.
Substances different from these could create serious problems
to the pump or other components.
The use of an inhibitor in the system such as Fernox MB-1 or
equivalent is strongly recommended to prevent corrosion (sludge)
damaging the boiler and system.
Failure to carry out this procedure may invalidate the appliance
warranty.
275
3.2.
REMOVING THE CASING
3.3.
CONTROL PANEL
To disassemble the front casing panel, follow these steps:
1. Unscrew the screws “A” (1/4 turn only) and rotate the control
panel forwards;
2. Unscrew the screws “B”;
3. Unhook the front panel of the casing by lifting it.
To disassemble the side panels, follow these steps:
4. Unscrew the screws “C” (at bottom) fastening the side panels;
5. Lift and unhook the panels.
1
A
3
2
B
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
M.
Selector Knob for Summer/Winter/Flue Test Modes
Domestic Hot Water Temperature Adjustment Knob
Central Heating Temperature Adjustment Knob
On/Off L.E.D.
On/Off Knob
“COMFORT” Function Push-button/heating only (RFFI SYSTEM)
“COMFORT” Function L.E.D./heating only (RFFI SYSTEM)
Reset Button
Multifunction Display
Heating System Pressure Gauge
Time Clock
Programming “+” key
Programming “-” key
3.4.
INITIAL START-UP
When necessary configure the main P.C.B. according to the following
diagram (please refer to the legend on page 17)
4
5
C
POSITION
INSERTED
NOT INSERTED
3
Secondary outlet (connection
C7; positions 1-9) controls a
LPG valve (optional).
The secondary outlet
controls what is
selected by Jumper 5.
4
Continuous pump operation.
No change in pump
operation.
5
Secondary output relates to a
secondary pump (optional).
Secondary output
controls a zone valve
(optional)
7
N.I.
I.
N.I.
I.
8
N.I.
N.I.
I.
I.
CONFIGURATION
Central heating only
MFFI
Not used
RFFI System
I = inserted (contact closed)
N.I = not inserted (contact open)
SECONDARY OUTLET = conntection C7 (position 1-9 page 17)
1. Make sure that:
- the cap of the automatic air release valve is loosened;
- the system pressure is at least 1 bar on the pressure gauge;
275
13
-
-
2.
3.
4.
5.
6.
the gas cock is closed;
the electrical connection has been carried out in the correct
manner. To allow the air to escape from the system, proceed as
follows:
turn on the On/off knob “D” and position the selector knob “A” in
the “winter” position. The boiler pump will start up and three
consecutive attempts will be made to ignite the burner. After the
third attempt, the electronic system will shutdown the boiler,
because the supply of gas has been cut off. The message “A01”
will appear on the display;
let the pump operate until all the air has escaped from the
system;
repeat the procedure for bleeding the radiators of air;
draw hot water for a short while;
check the system pressure and, if it has gone down, fill it with
water until it returns to 1 bar.
Check the flue system for products of combustion.
Check that any required local ventilation inlets are open.
Fill the boiler condensate trap with water.
N.B. In the event of prolonged period of system shutdown,
the condensate trap should be filled before any renewed use.
A shortage of water in the trap is dangerous because it could
possibly lead to a leakage of fumes into the air.
Turn on the gas cock and check the seals on the connections,
including the one for the burner, making sure that the meter does
not signal the passage of gas. Check the connections with a soap
solution and eliminate any leaks.
Press the reset button “H” for the lighting system; the spark will
light the main burner. If the burner does not light the first time,
repeat the procedure.
The boiler is configured in the factory for the gas type in
question. It is not necessary to regulate the gas type on
installation.
N OTE : the reference values of the CO 2 are contained in the
TECHNICAL INFORMATION section on page 4.
3.5.
DISPLAY: MESSAGES SHOWN DURING
NORMAL OPERATION
LEFT
RIGHT
3.6.
OPERATING PARAMETERS
The boiler has been designed to allow easy intervention with regard
to the operating parameters.
3.6.1.
CONTROL MODES
The generation of the set-point and the request for heat are clarified
in the following diagram, with regard to the heating mode.
* See section 3.6.2.
The remote control and the timer are available as an accessory Kit:
in the preceding diagram, it is clear that in the event that a device of
this type is not installed, the calculation of the set-point depends on
an outdoor sensor (if installed) and is carried out by the P.C.B.
N OT E : a configuration is also possible which allows for the
simultaneous presence of a remote control and an outdoor sensor. In
this case, the flow temperature is calculated as a function of the
external temperature and the room temperature. In this manner, it is
possible to carry out a particularly efficient modulation, which allows
considerable comfort to be obtained, combined with savings in fuel.
The influence of the roomstat and the timer are shown in the
following diagram, taking into consideration the fact that:
ON/OFF Room thermostat installed: contact open or closed,
controlled by the room thermostat temperature sensor.
ON/OFF Room thermostat not installed: contact closed (jumper).
Timer installed: contact open or closed, controlled by the timer
settings entered by the user.
Timer not installed: contact open.
Schematic representation of the influence exerted by the roomstat
and by the timer on the request for heat and on the calculation of the
set-point (flow temperature of the primary circuit) by means of the
external temperature values:
During operation of the boiler, while it is carrying out its normal
operations, the left-hand display shows a series of characters that
refer to the operations indicated below:
- Diagnostics phase (precedes the other operations)
0
No request for heat
C
Heating, burner off
C.
Heating, burner on
c
Pump overrun for heating
d
Domestic hot water, burner off
d.
Domestic hot water, burner on
h
Pump overrun for domestic hot water
b
Storage cylinder, burner off (SYSTEM version)
b.
Storage cylinder, burner on (SYSTEM version)
NOTE: the flashing dot on the left-hand display always indicates
“burner off”; if the still dot indicates “burner on”.
The right-hand display (two-digit) shows:
- in HEATING mode: temperature of the heating system flow;
- in DOMESTIC HOT WATER mode: temperature of domestic hot water.
14
275
3.6.2.
OUTDOOR SENSOR
In the case of the use of an outdoor sensor, the microprocessorcontrolled P.C.B. calculates the most suitable flow temperature,
taking into account the external temperature and the type of system.
The microprocessor is capable of doing this because it is possible to
establish a link between the external temperature and the flow
temperature of the heating system water. This link translates into a
"thermal curve".
The type of curve should be chosen in correspondence with the
planned temperature of the system and the nature of the heat loss
present in the building.
The flow temperature directly influences the room temperature,
therefore making reference to the room temperature is equivalent to
indicating variations in the temperature of the building.
9
100
8
7
6
5
4
60
3
PROCEDURES AND PRACTICAL EXAMPLES:
If the building is always cold, under all external temperature
conditions (and therefore in all seasons), the steps to take are as
follows:
The curve must be translated parallel to itself, i.e. raising the flow
temperature (and thereby the room temperature) in parity with the
external temperature.
It is possible to carry out this operation by heating temperature knob.
The konb in vertical position set a temperature oh 20°C. Turning the
knob on the right it’s possible to set a higher room temperature.
2
1
20
-20
+20
The type of curve is entered by means of the controls of the display
P.C.B located under the lid of the P.C.B. itself. To access the
programming buttons (+ / -), raise the lid with a screwdriver as shown
in the illustration.
In this manner, temperatures for the water coming out of the boiler
are set successively higher, which then influence the room
temperature increasing it to the desired settings.
In the event of the chosen curve not being the most suitable for the
type of system, it may be changed (selecting a more appropriate
one) or moved until the desired thermal behaviour is obtained for the
boiler and the system.
+
While turning the knob the display shows “d.xx” for few seconds, “xx”
is the room temperature set. Alternatively, it is possible to lower the
output temperature of the boiler if the room temperature is too hot.
It is possible obtain this turning the knob on the left translating lower
the curve.
-
NB: The last effect achieved by adjusting the thermal curves is to change
the behaviour of the system in relation to the room temperature. If
the curve used has been selected underestimating the thermal
needs of the building, i.e. it is too “low”, it is possible that the building
will not heat up sufficiently (the boiler will arrive to the set-point
before the building reaches the desired temperature); the result is
that the building will feel cold.
275
15
If the room temperature is too cold during the
winter (while in spring the temperature is
adequate), it is necessary to enter a steeper
curve. To do this, press the reset button for 5
seconds and then press it repeatedly until the
letter “FF” appears (using the “+” and “-” keys).
In this manner, the curves may be selected
from 1 to 5.
Alternatively, if the building is too warm in the
winter, while the room temperature is
adequate in warmer seasons, it is necessary
to choose a less steep curve, adjusting it in
the same manner as above.
If the following situation occurs: with low external temperatures (e.g:
winter, -20°C) the building is adequately heated, but with favourable
climatic conditions (e.g: spring, +20°C) it is not sufficiently heated, it is
necessary first to choose a lower curve (“FF” on the display and then “-”)
and then turning the heating temperature knob.
In the opposite situation (in which the building is too hot in spring and
adequately heated in winter), a higher curve (“dd” and “+”) must first
be chosen and then “moved” turning the heating temperature knob.
The general conditions to follow upon installation are the following:
Warning (see 3.7.2)
* The curves 1,2,3,4,5,6 could be set in the lower temperature;
* The curves 5,6,7,8,9 could be set in the upper temperature;
CURVE 4-5: conventional low temperature boilers (cast iron and
aluminum radiators, radiant plate systems). Planned
temperature 60/45°C.
CURVE 6-7: conventional low temperature boilers (cast iron and
aluminum radiators, radiant plate systems). Planned
temperature 75/60°C.
CURVE 8-9: boilers with higher temperatures (radiators, convectors,
fan coils). Planned temperature 90/75°C.
CURVE 1:
under floor heating (radiant panels at ultra-low
temperature). Planned temperature 30/20°C.
CURVE 2-3: under floor heating (radiant panels, low temperature
radiant plate systems). Planned temperature 40/30°C.
For buildings with standard insulation, materials and exposure, it is recommended initially that the straight line not be moved parallel to itself. If
a timer is installed, it is possible to set different temperatures for daytime and night-time. It is therefore possible to lower the temperature that
the P.C.B. calculates in relation to the values provided by the outdoor sensor by a quantity decided by the user for night-time operation. To do
this, it is necessary to select the night function “uu”, in the following manner:
- press the reset key for 5 seconds;
- press the same key again once to make the “nn” character appear;
- using the programming keys “+” and “-”, select a value from 0 to 12 depending on the amount of night-time lowering of the temperature
desired.
16
275
3.6.3.
SETTINGS DISPLAY
The boiler is designed to monitor some operating variables and
settings by means of the display on the front control panel. Keeping
the reset key pressed for over 10 seconds allows access to the
“readout” function of the main system variables. By pressing the
button repeatedly after that, it is possible to read the following
information in sequence:
Indication on the
left-hand display
Value read on right-hand display
U/1
Flow temperature of the heating circuit (C°)
U/2
Return temperature of the heating circuit (C°)
U/5
Domestic hot water output temperature (C°)
U/F
Ionisation current (expressed in bT)
U/t
Main circuit flow switch
P/A
Heating ignition delay (see section 3.6.4. -
entered may be viewed in the manner described in section 3.6.3.
(the display shows the value with steps of 10).
2.
PR - Maximum heating circuit power potentiometer, variable
between the maximum allowed by the boiler and the minimum
(see “TECHNICAL INFORMATION” table). The boiler is calibrated in
the factory at 70%.
3.
RLA - Soft-light potentiometer, variable between the
maximum power (shown on the display as “000”, i.e. 100%) and
minimum power (shown on the display as “001”, i.e. 1%). The boiler
is calibrated in the factory at a value which is suitable for ignition
with any type of gas (approx. 70%).
The display shows the value between 100% (“000” on the display)
and 1% (“001”) of this interval. The indications on the display with
regard to the power are shown in the graph:
DISPLAY MESSAGE REFERENCE
expressed in min.x10)
P/-
Maximum thermal power for heating (expressed
in a percentage of the difference between the
maximum power allowed by the boiler and the
minimum)
P/L
Soft light power (expressed in a percentage of
the difference between the maximum power
allowed by the boiler and the minimum)
b
Last safety shut-off (see section 3.7.)
l
Last shutdown (see section 3.7.)
To return to the normal display, press the “H” reset key repeatedly
until all the sequence of “readout” functions have scrolled through the
display and until one of the “display of normal operations” has
appeared (the message that appears will depend on the current
operating mode of the boiler).
* NOTE 1: U/1 means that “uu” and “11” blink alternately on the display
NOTE 2: the value 100% appears as “000” on the display
3.7.
REGULATIONS
3.7.1.
POTENTIOMETERS
To access the areas reserved for the regulation and control, open the
control panel, after having first unscrewed the plastic fastening
screws, and raise the rubber protection stopper for the
potentiometers, as shown in the illustration.
3.7.2.
SETTING THE TEMPERATURE FIELD
Remove the protection of the display using a screwdriver as a lever.
Press the reset button for over 5 seconds. The display will show
“AA03”. On pressing the reset button again the display will change to
“RR00” (R indicates the setting of the field of regulation of the flow
temperature). Using the button “E”, the setting may be changed. It is
possible to choose two fields of regulation of the flow temperature.
“000” signifies that the flow temperature (which may be set by means
of the knob on the front control panel) may be regulated from 30 to
75°C. “001” signifies that the flow temperature (which also may be set
by means of the knob on the front control panel) may be regulated
from 42 to 82 °C. The factory setting is “000”.
3.7.3. COMFORT KEY:
24 MFFI
The boiler allows the convenience level to be increased in the output
of domestic hot water by means of the “COMFORT” function. This
function keeps the secondary exchanger warm during the periods in
which the boiler is inactive, thereby allowing the initial water drawn to
be at a higher temperature. The function may be activated by
pressing the “H” key on the control panel (see section 3.3.). When
the function is active, a green light comes on, again located on the
control panel.
N OTE : During the overrun period of the pump, the “COMFORT”
function, if selected, is temporarily deactivated. The L.E.D. light
remains on to indicate that the boiler will return to the “COMFORT”
mode once the pump overrun is terminated.
HEATING ONLY KEY:
24 RFFI
This allows access to the three regulation potentiometers:
1.
275
RA - Ignition delay (anti-cycling device) potentiometer
It is possible to set the ignition delay by adjusting the
potentiometer with a screwdriver. The values that may be
selected range from 0 to 15 min.
The delay has been set at 15 minutes in the factory. The value
This function may be activated by pressing the “H” key on the
control panel (see section 3.3.). When the function is active, a green
light comes on, again located on the control panel. This indicates that
the external indirect cylinder is not maintained at the set temperature,
only the anti-frost protection of the indirect cylinder is active. When
the temperature goes below 5°C, the boiler turns itself on and heats
up the indirect cylinder until the temperature goes over 10°C.
17
3.7.4.
PUMP OVERRUN
The pump overrun may be varied (after the burner has been turned
off). To access this function, it is necessary to press the reset button
for over 5 seconds and then press it repeatedly until the character
“AA” appears on the left-hand display.
The following modes are available:
01
1 minute of pump overrun
03
3 minutes of pump overrun
06
6 minutes of pump overrun
09
9 minutes of pump overrun
12
12 minutes of pump overrun
15
15 minutes of pump overrun
CO
24 hours of pump overrun
3.7.5.
TEST MODE
The P.C.B. allows the boiler to be forced to the maximum or minimum
power.
To make the boiler operate at maximum power (100%: 24kW), it is
necessary to turn the selector knob “A” (section 3.3.) and, using a
light pressure, bring it to the <
> position. To return the boiler to its
normal function, turn the selector “A” to the summer or winter
position.
NOTE: To force the boiler to its maximum output it is necessary to
completely rotate the potentiometer for maximum heating output
regulation (PR).
It is also possible to set a continuous pump operation by closing the
contact of jumper 4 (see section 2.12.).
3.7.6.
REGULATION MENU TABLE
Summary of the functions accessed when the RESET button is pushed for 5 seconds.
3.8.
BOILER SAFETY SYSTEMS
The boiler is protected from malfunctioning by means of internal
checks by the P.C.B., which brings the boiler to a stop if necessary.
In the event of the boiler being shut off in this manner, a code
appears on the display which refers to the type of shut-off and the
reason behind it.
There are two types of shut-off:
SAFETY SHUTDOWN :these group of errors (characterised on
the display by the letter “EE”) this situation is automatically
removed as soon as the cause behind it is resolved.
As soon as the origin of the shutdown disappears, the boiler
starts up again and returns to its normal operation.
SHUTDOWN: (characterised on the display by the letter “AA”), it is
not removed unless a manual intervention is made.
The boiler may return to operation only if reset by means of
pressing the button “H” (see illustration on page 18) located at
the centre of the display.
There follows a list of the shutdown modes and the respective codes
shown on the display.
Shutdown (“AA” type): if such a situation occurs, it is necessary to reset
the boiler using the appropriate key. If this shutdown occurs again, an
Authorised Service Centre should be contacted.
18
DISPLAY
CAUSE
A01
Too many attempts to ignite on starting up
A02
After three attempts at ignition, no increase in DT was
detected
A03
The heating flow temperature exceeds 100°C during
operation
A07
Too many failures to flame in one period during operation
A19
The flame was detected after the gas valve had closed
A20
The flame was detected before the gas valve opened
A21
The flow switch does not close
A22
The flow switch does not open
A33
Problem with the fan
A99
Problem with the electronic monitoring
NOTE:
When there is no ignition, check that the gas cock is open.
Safety shutdown: In the event that a safety shutdown occurs, it is
necessary to contact an Authorised Service Centre.
275
DISPLAY
E03
CAUSE
Flow temperature over 100°C while boiler is not in
operation (stand-by)
E56
Heating flow temperature probe in open circuit
E66
Heating flow temperature probe short-circuited
E04
Domestic hot water temperature probe in open circuit
E05
Domestic hot water temperature probe in short circuit
E08
Under floor heating temperature probe in open circuit
E20
Flame detected with gas valve closed
E21
Error in the electrical connection (live and neutral crossed)
E22
Problem with the 50Hz power supply
E23
Flame detection electrode short-circuited
E64
Heating return temperature probe in open circuit
E74
Heating return temperature probe in short circuit
E99
Problem within the electronic system
There follows a description of the safety functions that most influence
the behaviour of the boiler.
1. FLOW SWITCH. At the beginning of every ignition sequence, the
P.C.B. checks the operation of the main circuit flow switch.
Initially, the pump is off and the flow switch must be open (not
giving consent); if this does not occur within the space of a
minute, the system carries out a shutdown. When the flow switch
is open, the pump is turned on and within one minute the flow
switch must close; if it does not do so, the monitoring
mechanism shuts down the boiler (with the pump off).
During normal operation, the flow switch must remain closed; if it
opens for over two seconds, the boiler shuts down, then the
monitoring mechanism will attempt to turn it back on.
2.
3.
-
-
-
FAN . On ignition, the fan must rotate at the correct speed,
otherwise the boiler will not attempt to turn itself on. During
operation, the fan rotates at the speed set by the control P.C.B.;
if the number of rotations deviates by more than 300 rpm from
this setting, the boiler shuts off.
OVERHEATING. This device shuts down the boiler in the event that
the primary circuit reaches a temperature that exceeds 100°C.
The operation of the overheat monitoring mechanism also
includes the following precautionary measures:
After ever y ignition, the system flow temperature or the
flow/return difference must increase by 3°C in 20 seconds. Until
an increase of 3°C is reached, the boiler remains at the ignition
power. If the increase in temperature does not come about, the
boiler shuts down and will not attempt to re-ignite until the flow
temperature is below 50°C. If after three attempts the
temperature does not increase, the boiler shuts down.
Before the boiler attempts ignition, the system flow/return
temperature difference must be below 20°C. In order for a
successive attempt at ignition to be carried out, the system must
register that once every 2 hours the flow/return temperature
difference is below 5°C.
If, during operation the return temperature becomes greater than
the flow temperature by more than 5°C, the boiler shuts down
immediately.
4.
DAILY TEST. In order to prevent the shutdown of the components,
the boiler carries out a self-diagnosing test every 24 hours: the
pump turns on for 3 seconds and the diverter valve moves.
5.
ANTI-FROST DEVICE. The boiler is fitted with an anti-frost device
consisting of three separate functions:
Monitoring of the system flow temperature: if this temperature
goes below 5°C, the pump turns on (heating system circulation).
If the temperature goes below 2°C, the boiler turns on at the
minimum power and remains on until the return temperature is
over 10°C.
Outdoor sensor installed: the pump turns on if the external
-
275
temperature goes below -3°C, it turns off when the external
temperatures raises above -1°C.
Continuous operation of the pump: select by means of jumper 4
(see paragraph 3.6.6.).
NOTE: In all cases, the circulation takes place in the heating system.
The anti-frost device activates only when (with the boiler operating
correctly):
the system pressure is correct;
the boiler is electrically powered;
there is a supply of gas.
6.
ANTI-SCALE DEVICE. When producing domestic hot water, the
burner shuts off whenever the output temperature of the hot
water exceeds 62°C or the flow temperature of the primary
circuit exceeds 72°C. It will not turn on if the temperature of the
primary circuit is greater than 72°C.
3.9.
COMBUSTION ANALYSIS
The boiler is designed to
allow for easy analysis of
the
products
of
combustion.
Using the special traps, it
is possible to detect the
temperature of the burnt
gas, the combustion air,
the concentrations of O2,
CO2, etc.
The maximum heating power test conditions may be optimised by
turning the selector knob “C” to the flue test position.
3.5.
DRAINING
The draining of the heating system must be carried out as follows:
Turn off the boiler and the bipolar switch;
Loosen the automatic air release valve (27);
Open the system's discharge valve (18) and gather the water
that comes out in a container;
Empty out from the lowest points of the system (where
provided).
If the system is to be left active in areas where the room temperature
may go below 0°C during winter, it is recommended that anti-freeze
liquid be added to the water in the heating system in order to avoid
the need for repeated draining.
Draining the domestic hot water system
Every time that there is a danger of freezing, the domestic hot water
system must be drained as follows:
close the water mains stop-cock;
open all the hot and cold water outlets;
empty out from the lowest points (where provided).
19
4. GAS ADJUSTMENTS
4.1.
OVERALL VIEW
NOTE: the values refer to the upper calorific power
Natural Gas
Type of appliance
Marking on the label of characteristics
Further indications
Factory setting for the Wobbe Wo index
in kWh/m3
LL
E
LPG
Yellow adhesive label:
calibrated for 'L' type
methane
Wo=11.5 Kw/m3
(from 9.5 to 12.4 kWh/m)
20mbar
Yellow adhesive label:
calibrated for 'H' type
methane
Wo=14.1 Kw/m3
(from 11.4 to 15.2 kWh/m3)
20mbar
Yellow adhesive label:
calibrated for LPG
Wo=24.3 Kw/m3
(from 20.2 to 24.3
kWh/m3)
50mbar
11.5
14.1
24.3
Factory setting of the thermal capacity
for the production of hot water
Maximum thermal power
70% Maximum thermal power
Factory setting of the thermal capacity
for the heating
4.2.
LPG
PRELIMINARIES
Check that the indication for type of appliance (category and type of
gas calibration) reported on the label of characteristics corresponds
to the gas family / group of the gas supply.
A
The type of of appliance does not
correspond to the gas family of the
gas supply
B
The type of appliance corresponds
to the gas family of the gas supply
Domestic hot water:
Heating:
Check the regulation according to section 4.3
In the event of the heating power setting being different from the
thermal power setting required, the gas must be adjusted as in
section 4.3. Otherwise, it is enough to check the
correspondence.
The type of appliance does not
correspond to the gas supply group
(but corresponds to the family).
Domestic hot water:
Heating:
Transform the boiler in accordance with section 4.5, after which:
Check the regulation in accordance with 4.3
Carry out the gas regulation in accordance with point 4.3 in
keeping with the thermal power requested.
C
4.3.
The appliance cannot be installed or put into operation.
GAS REGULATION
To regulate the gas, the sequence described below must be followed.
-
Unscrew by 2 to 3 rotations the sealing screws marked “PE” of
the pressure measurement inlet nipple
Connect up a pressure gauge
Place the appliance in operation in accordance with the usage
manual
Measure the connection pressure (dynamic pressure)
-
4.3.1.
INLET PRESSURE TEST
This pressure, for methane gas, must be between 18 and 25 mbar.
In the event that the pressure is outside of the above range, the
boiler must not be placed in operation.
Turn off the boiler.
Remove the pressure gauge.
Screw in the sealing screws of the pressure measurement inlet
nipple and check the seal.
If it proves impossible to eliminate the defect, contact the gas supply
board.
20
4.3.2.
REGULATION OF THE THERMAL POWER
For the regulation of the gas in the ecoGENUS, two separate
operations are required.
A) Domestic hot water side (test only)
B) Heating side (regulation and test)
A) DOMESTIC HOT WATER:
The thermal power for the hot water is set in the factory at the
maximum power.
For this reason the boiler does not need any regulation of the gas
from the "domestic hot water" side, just a test using the volumetric
method at the gas meter:
Make sure that there are no other gas appliances in operation
during the test.
Place the boiler in operation in accordance with the usage
manual and draw hot water (tap totally open, temperature knob
at 9).
NOTE: the test of the volumetric rate of flow must be carried out for at
least two minutes of boiler operating time.
Identify the volumetric rate of flow for the maximum thermal
power from the table at the end of this section.
275
-
Make a note of the value here. Value from table: ................l/min.
Identify the volumetric rate of flow at the gas meter and compare
it with that of the table.
Differences greater than +/- 5 % are not allowed: contact the
Authorised Service Centre and do not place the boiler in
operation.
B) HEATING:
The thermal power is set in the factory at 70% of the maximum
power (the potentiometer corresponds to the value on the display). In
the event that this setting has to be changed, these steps should be
followed:
open the control panel after having unscrewed the plastic
fastening screws and lift up the rubber stopper protecting the
potentiometers (see section 3.7.1.). Rotate the potentiometer PR
to the desired point, checking the set thermal power on the
display (as described in section 3.6.3.) and on the table below.
Test:
Turn the selector knob “A” to the flue test position.
Do not draw hot water.
NOTE: The test of the volumetric rate of flow must be carried out for at
least five minutes of boiler operation.
Identify the volumetric rate of flow from the table and make a
note of it here.
Value from the table: ……….l/min.
Identify the volumetric rate of flow at the gas meter and compare
it with that of the table.
4.4. CHANGING THE TYPE OF GAS
The boiler may be transformed for use with LPG (G30-G31); the
operation must be performed by an Authorised Service Centre.
The operations to carry out are the following:
1. Replacement of the nozzle (see table);
2. Replacement of the gas label;
3. Regulation of the slow ignition (refer to section 3.7 and the table
in 4.3)
CATEGORY
-
-
275
LPG
G20
G30
G31
• Diameter of 6 nozzle holes (mm)
2.7
1.7
1.7
• Display of recommended soft-light
70
(about 19 kW)
70
(about 19 kW)
70
(about 19 kW)
4.5.
-
NATURAL GAS
OPERATING TESTS
Place the boiler in operation in accordance with the User’s
Manual.
Check the seal on the gas and water sides.
Check that the ignition operates correctly and visually check the
burner flame.
Check that the domestic hot water is being correctly produced
by drawing hot water. Check the rate of flow and/or temperature
of the water, depending on the case.
Check that the condensate drips without difficulty into the
discharge.
21
5. ZONE VALVES
6. MAINTENANCE
The boiler is capable of managing a heating system that uses zone
valves. The electrical connection of these valves is carried out by
means of the appropriate ter minal board (indicated in the
“ELECTRICAL CONNECTION” section).
By way of example, two possible types of systems would be:
1. System with 2 valves with independent regulation of the zones
(day and night).
2. System with 1 valve (regulation of the night zone subordinated to
that of the day).
A possible set-up for the first type of system is as follows:
6.1.
CR
VZ1,2
TA
F,N
RL
= remote control
= zone valve 1 and 2
= roomstat or timer-thermostat
= radiators
= electrical connection (live and neutral)
= relay
A possible set-up for the system with a single zone valve is as
follows:
GENERAL REMARKS
It is recommended that the following inspections be carried out on
the boiler at least once a year:
1. Check the seals in the water group and, if necessary, replace
the gaskets and restore the seal to perfect working order.
2. Check the seals in the gas group and, if necessary, replace the
gaskets and restore the seal to perfect working order.
3. Visually check the overall state of the boiler.
4. Visually check the combustion and, if necessary, disassemble
and clean the burner.
5. Following inspection 3, disassemble and clean the combustion
chamber, if necessary.
6. Following inspection 4, disassemble and clean the injector, if
necessary.
7. Clean the primary heat exchanger (see section 6.2)
8. Regulate the correct rate of flow of the gas: rate of flow on
ignition, partially loaded and at maximum load.
9. Check the correct functioning of the heating safety devices:
- temperature limit safety device.
10. Check the correct functioning of the gas group safety devices:
- absence of gas or flame safety device (Ionisation).
11. Check that the electrical connections are correct (in conformity
with the instructions manual).
12. Check the efficiency of the production of domestic hot water
(test the rate of flow and temperature).
13. Carry out a general inspection of the functioning of the boiler.
14. Check the characteristics for expulsion of the products of
combustion.
15. Remove the oxide from the detection electrode by means of an
emery cloth.
6.2.
CLEANING THE PRIMARY EXCHANGER
CLEANING THE EXHAUST SIDE
Remove the combustion chamber inspection hatch (20) (see section
1.3). Check that the exhaust passages between the blades of the
block are free; if there are deposits present, wash the blades with
compressed air, water or a vinegar-based detergent.
NOTE: it is possible to use a brush in order to mechanically remove
the residues.
Use of detergents:
soak the blades well
allow the detergent to act for about 20 minutes
rinse with a strong jet of water to remove the deposits (the
control panel must be kept closed)
make sure that there are no traces of detergents in the
exchanger.
CLEANING THE WATER SIDE
Use detergents that dissolve CaCO3. Leave to act for a short time
(in order not to damage the aluminum) and then rinse. Make sure
that the detergent does not remain inside the exchanger.
This set-up is simpler and more economical because it does not
involve the use of the special relay. The night zone, however, may
only be heated during the time periods in which the remote control
timer gives consent to the heating of the day zone. Example:
•
day zone programming (remote control): 8-22
•
night zone programming (timer-thermostat): 20-22
22
6.3.
CLEANING THE CONDENSATE TRAP
Unscrew the lower part of the condensate trap and clean it. Lastly, fill
it with water and replace the stopper.
NB: if the boiler is not to be used for a prolonged period, the
condensate trap should be filled before igniting it again. A shortage
of water in the trap is dangerous because there is the risk of exhaust
fumes escaping into the air.
275
6.4.
OPERATIONAL TEST
After having carried out the maintenance operations, fill the heating
circuit to a pressure of approx. 1.5 bar and release the air from the
system. Also fill the domestic hot water system.
Place the boiler in operation.
If necessary, release the air again from the heating system.
Check the settings and the correct functioning of all the control,
regulation and monitoring parts.
Check the seal and the correct functioning of the system for
expelling fumes/drawing of combustion air.
Check that the boiler ignites properly and carry out a visual
check on the burner flame.
275
23
7. TECHNICAL INFORMATION
Certification
Category
Thermal Capacity min/max
Usable Thermal Power min/max (30/40°C)
Usable Thermal Power min/max (60/80°C)
Usable Thermal Power min/max (30/50°C)
Power for Hot Water Production min/max
Efficiency at Nominal Thermal Capacity (30/50°C)
Efficiency at 30% of Nominal Thermal Capacity (47°C of return)
Efficiency at 30% of Nominal Thermal Capacity (30°C of return)
Gas Consumption after 10 Minutes*
Maximum Heat Loss to the Casing (∆T=50°C)
Flue Heat Loss with Burner Operating
Flue Heat Loss with Burner Off
Maximum Discharge of Fumes
Maximum Temperature of Discharge Fumes
Temperature of Discharge Fumes when Heating 30/40°C (1 m of coax.)
Minimum Room Temperature
Heating Temperature min/max (High Temperature range)
Heating Temperature min/max (Low Temperature range)
Temperature of Water for Domestic Use min/max
Class NOX
CO2 Content
O2 Content
CO Content
Inlet Pressure/Methane Gas G20 (boiler at maximum)
Inlet Pressure/Liquid Gas G30 - G31 (boiler at maximum)
Residual Discharge Head
Maximum Head Loss on Water Side (∆T=20°C)
Residual Head of System (60/80°C)
Maximum Heating Pressure
Maximum Water Content in System
Expansion Vessel Capacity
Expansion Vessel Pre-load Pressure
Pressure of Water for Domestic Use min/max
Nominal Capacity of Hot Water for Heating (residual head 0.25 bar)
D.H.W. Flow Rate:
∆T=25°C
∆T=30°C
∆T=35°C
D.H.W. Flow Minimum Rate
Quantity of Condensed Water with a (30/40°C)
pH Condensation Value
Electrical Supply
Power Consumption
Protection Grade of Electrical System
Internal Fuse Rating
Width
mm
Height
mm
Depth
mm
Central Heating Connections
Domestic Hot Water Connections
Gas Connection
Net Weight
G.C. Number
kW
kW
kW
kW
kW
%
%
%
m3
%
%
%
Kg/h
°C
°C
°C
°C
°C
°C
%
24 MFFI
24 RFFI SYSTEM
63AT4528
II2H3B/P
8/24
8.8/26.1
7.9/23.3
-/24.5
7.9/23.3
102.2
96.4
103.6
0.42
0.6
2.1
0.2
35.1
66.7
42.9
5
42/82
30/75
36/56
5
9.3
63AT4528
II2H3B/P
8/24
8.8/26.1
7.9/23.3
-/24.5
7.9/23.3
102.2
96.4
103.6
0.42
0.6
2.1
0.2
35.1
66.7
42.9
5
42/82
30/75
36/56
5
9.3
%
4
ppm
mbar
mbar
mbar(Pa)
mbar
bar
bar
l
l
bar
bar
l/h
l/min
l/min
l/min
l/min
l/h
53.5
20
30
0.65(64)
200
0.2
3
130
7
1
0.2/8-10
820
13.4
11.1
9.6
2.5
1.8
3.5÷4
230/50
130
4XD
3.15 SLOW
465
890
385
3/4
1/2
3/4
45
V/Hz
W
IP
A
BSP
BSP
BSP
Kg
41-116-17
Manufacturer:
Merloni TermoSanitari SpA - Italy
Commercial subsidiary:
MTS (GB) LIMITED
MTS Building
Hughenden Avenue
High Wycombe
Bucks HP13 5FT
4
53.5
20
30
0.65(64)
200
0.2
3
130
7
1
0.2/8-10
820
--------1.8
3.5÷4
230/50
130
4XD
3.15 SLOW
465
890
385
3/4
1/2
3/4
44.5
41-116-03
*Calculated at 70% maximum output
Telephone: (01494) 755600
Fax: (01494) 459775
Internet: http://www.mtsgb.ltd.uk
E-mail: [email protected]
Technical Service Hot Line: (01494) 539579
23 99 84 1439 112
Servicing
Instructions
Type C Boilers
G.C.N: 41-116-03
47-116-17
LEAVE THESE INSTRUCTIONS
WITH THE END-USER
Country of destination: GB
Condensing
TABLE OF CONTENTS
2
1.
SERVICING INSTRUCTIONS
1.1
REPLACEMENT
1.2
TO GAIN GENERAL ACCESS
- Lowering the control panel and removing the front panel
- Removing the side panels
1.3
ACCESS TO THE COMBUSTION CHAMBER
- Removing the sealed chamber front cover
- Removing the fan
- Removing the burner
- Removing the electrodes
- Removing the heat exchanger inspection panel
- Removing the condensate collector
- Removing the condensate trap
- Removing the injector
1.4
ACCESS TO THE GAS VALVE
- Removing the gas valve
1.5
ACCESS TO THE WATER CIRCUIT
- Removing the D.H.W. (secondary) exchanger
- Removing the safety valve
- Removing the automatic air vent
- Removing the main circuit flow switch
- Removing the diverter valve actuator
- Removing the D.H.W. flow switch
- Removing the pump
- Removing the pressure gauge
- Removing the expansion vessel
- Removing the D.H.W. temperature sensor (N.T.C.)
- Removing the C.H. flow temperature sensor (N.T.C.)
- Removing the C.H. return temperature sensor (N.T.C.)
1.6
ACCESS TO THE CONTROL SYSTEM
- Checking the fuses
- Removing the time clock
- Removing the P.C.B.s
2.
FAULT FINDING
2.1
FAULT FINDING GUIDE (FLOW-CHART)
3.
ELECTRICAL DIAGRAMS
4.
SHORT SPARE PARTS LIST
OF
PARTS
1.
To ensure efficient safe operation, it is recommended that the boiler is
serviced annually by a competent person.
SERVICING
INSTRUCTIONS
Before starting any servicing work, ensure both the gas and electrical
supplies to the boiler are isolated and the boiler is cool.
Before and after servicing, a combustion analysis should be made via the flue
sampling point (please refer to the Installation Manual for further details).
After servicing, preliminary electrical system checks must be carried out to
ensure electrical safety (i.e. polarity, earth continuity, resistance to earth and
short circuit).
1.1
REPLACEMENT
OF PARTS
The life of individual components vary and they will need servicing or
replacing as and when faults develop.
The fault finding sequence chart in chapter 2 will help to locate which
component is the cause of any malfunction, and instructions for removal,
inspection and replacement of the individual parts are given in the following
pages.
1.2
TO GAIN GENERAL
ACCESS
All testing and maintenance operations on the boiler require the control panel
to be lowered. This will also require the removal of the casing.
To lower the control panel and dismantle the front part of the casing,
proceed as follows:
1. Unscrew screws “A” (1/4 turn only) (FIG. 1.1 + FIG. 1.2) and rotate the
control panel forward;
2. Unscrew the screws “B” (FIG. 1.3) and unhook the front panel by lifting it.
FIG. 1.2
B
FIG. 1.1
B
A
A
A
FIG. 1.3
3
Removing the side panels
1.3
ACCESS TO THE
COMBUSTION CHAMBER
1. Remove the screws “C” (FIG. 1.4);
2. Pull each panel away from the boiler, then lift the panel
up and away from the boiler.
Removing the sealed chamber front cover
1. Remove the screws “D” (FIG. 1.5);
2. Pull the cover away from the boiler (FIG. 1.6).
C
C
D
D
D
D
FIG. 1.5
C
C
FIG. 1.4
FIG. 1.6
4
Removing the fan
1. Loosen nut “E” (FIG. 1.7);
2. Pull off the hose “F” and disconnect the electrical
connector “G” (FIG. 1.8);
3. Remove the nuts “H” (FIG. 1.9);
4. Pull the fan away from the exchanger (FIG. 1.10).
FIG. 1.9
H
H
H
E
FIG. 1.7
F
FIG. 1.10
G
FIG. 1.8
5
Removing the burner
With the fan removed (see previous section);
1. Slide the burner from its housing (FIG. 1.11).
FIG. 1.14
Removing the combustion chamber inspection panel
FIG. 1.11
1. Remove the four nuts “K” (FIG. 1.15);
2. Remove the inspection panel (FIG. 1.16).
Removing the electrodes
1. Pull off the ignition cable “I” (FIG. 1.12);
2. Remove the two allen bolts “J” (FIG. 1.13);
3. Extract the electodes (FIG. 1.14).
K
K
I
K
K
FIG. 1.15
FIG. 1.12
FIG. 1.16
J
J
FIG. 1.13
6
Removing the condensate collector
1. Remove the nuts “L” from each side of front of the
collector (FIG. 1.17);
2. Remove the nuts “M” from each side of rear of the
collector (FIG. 1.18);
3. Release the condesate trap union “N” (FIG. 1.19);
4. Separate the collector from the combustion
chamber(FIG. 1.20);
5. Remove the condensate collector (FIG. 1.21).
N
FIG. 1.19
L
FIG. 1.17
FIG. 1.20
M
FIG. 1.18
FIG. 1.21
7
Removing the condensate trap
Removing the injector
1. Loosen the union “O” (FIG. 1.22);
2. Remove the condensate trap (FIG. 1.23).
See the section on removing the fan before carring out this
procedure
1. Disconnect all connections from the fan and remove
(FIG. 124);
2. Remove the four screws “P” (FIG. 125);
3. Unscrew the injector “Q” using a suitable screwdriver
(FIG. 126);
4. Remove the injector (FIG. 127).
O
Fig. 1.24
FIG. 1.22
P
Fig. 1.23
Fig. 1.25
8
Q
FIG. 1.26
FIG. 1.27
9
1.4
ACCESS TO THE GAS VALVE
Removing the gas valve
1. Disconnect the electrical connection “R” from the gas
valve (FIG. 128);
2. Release the top nut “S” (FIG. 1.29);
3. Remove the screws “T” from the bottom of the gas valve
pipe (FIG. 1.30);
4. Remove the gas valve (FIG. 1.31).
T
FIG. 1.30
R
FIG. 1.28
S
FIG. 1.29
10
FIG. 1.31
T
1.5
ACCESS TO THE WATER CIRCUIT
Important! Before any component is removed, the boiler
must be drained of all water.
Removing the safety valve
1. Loosen union “W” (Fig. 1.35);
2. Unscrew and remove the valve (Fig. 1.36).
Removing the D.H.W. (secondary)
exchanger
1. Remove the screw “U” (FIG. 1.32);
2. Remove the screw “V” (FIG. 1.33);
3. Push the exchanger towards the rear of the boiler, lift
upwards and remove from the front of the boiler (FIG.
1.34);
4. Before replacing the exchanger ensure that the O-rings
are in good condition and replace if necessary.
W
U
FIG. 1.35
FIG. 1.32
V
FIG. 1.33
FIG. 1.36
FIG. 1.34
11
Removing the automatic air vent
Removing the diverter valve actuator
1. Unscrew valve “X” (FIG. 1.37);
2. Remove (FIG. 1.38).
1. Unplug the electrical connector “Z” (FIG. 1.41);
2. Release the retaining clip “A1” and remove the diverter
valve actuator (FIG. 1.42).
Z
X
FIG. 1.41
FIG. 1.37
A1
FIG. 1.42
FIG. 1.38
Removing the main circuit flow switch
Removing the D.H.W. flow switch
1. Release the retaining clip “Y” (FIG. 1.40);
2. Remove the main circuit flow switch.
1. Release the retaining clip “B1” (FIG. 1.43);
2. Remove the D.H.W. flow switch.
B1
Y
FIG. 1.40
12
FIG. 1.43
Removing the pump
1.
2.
3.
4.
Unplug the electrical connection “C1” (FIG. 1.44);
Release the nut “D1” (FIG. 1.45);
Release the nut “E1” (FIG. 1.46);
Remove the pump (FIG. 1.47).
C1
E1
FIG. 1.46
FIG. 1.44
D1
FIG. 1.47
FIG. 1.45
13
Removing the pressure gauge
Removing the expansion vessel
1. Release coupling “F1” (FIG. 1.48);
2. Ease the pressure gauge “G1” through the control panel
from the rear (FIG. 1.49);
3. Remove the pressure gauge. (FIG 1.50).
See the section on removing the condesate trap before
carrying out this procedure
1. Loosen nut “H1” (FIG. 1.51);
2. Loosen nut “I1” and remove backnut “J1” (FIG. 1.52);
3. Remove the expansion vessel (FIG. 1.53).
H1
F1
FIG. 1.48
FIG. 1.51
G1
J1
I1
14
FIG. 1.49
FIG. 1.52
FIG. 1.50
FIG. 1.53
Removing the D.H.W. temperature probe (N.T.C.) (MFFI
only)
1. Remove the electrical connector “K1” by pulling off
(Fig. 1.54);
2. Unscrew and remove the D.H.W. temperature probe “L1”
(FIG. 1.55).
N1
FIG. 1.57
K1
Removing the C.H. return temperature probe (N.T.C.)
1. Remove the electrical connector “O1” by pulling off
(Fig. 1.58);
2. Unscrew and remove the C.H. return temperature probe
“P1” (FIG. 1.59).
FIG. 1.54
O1
L1
FIG. 1.55
FIG. 1.58
Removing the C.H. flow temperature probe (N.T.C.)
1. Remove the electrical connector “M1” by pulling off
(Fig. 1.56);
2. Unscrew and remove the C.H.flow temperature probe
“N1” (FIG. 1.57).
P1
FIG. 1.59
M1
FIG. 1.56
15
1.6
ACCESS TO THE CONTROL SYSTEM
Checking the fuses
1. Remove the inspection cover on the reverse of the
control panel (FIG. 1.60);
2. Remove the fuses by pushing and rotating fuse holders
“Q1” (FIG. 1.61).
Removing the time clock
1. Remove the inspection cover on the reverse of the
control panel (FIG. 1.60);
2. Lower the time clock door (FIG. 1.62);
3. Unplug the electrical connection “R1” from the time clock
(FIG. 1.63);
4. Gently squeeze each end of the time clock and push
through the control panel (FIG. 1.64).
FIG. 1.60
FIG. 1.62
Q1
R1
FIG. 1.61
FIG. 1.63
FIG. 1.64
16
Removing the P.C.B.s
1. Remove the inspection cover on the reverse of the
control panel (FIG. 1.60);
2. Remove the screws “S1” (FIG. 1.65 & FIG. 1.66);
3. Remove the facia panel (FIG. 1.67);
5. Disconnect the connection cable ”T1” (FIG. 1.68);
6. Unplug the electrical connectors “U1” from the main
P.C.B. (Fig. 1.69);
7. Remove the main P.C.B. mounting screws “V1’ (four in
total) (FIG. 1.70);
8. Remove the main P.C.B. (FIG. 1.71);
9. Remove the display P.C.B. mounting screws “W1’ (FIG.
1.72);
10.Remove the display P.C.B. (FIG. 1.73);
11.Replace either P.C.B. in reverse order.
T1
FIG. 1.68
U1
S1
U1
U1
S1
FIG. 1.65
FIG. 1.69
S1
V1
S1
FIG. 1.66
V1
FIG. 1.70
FIG. 1.67
FIG. 1.71
17
W1
W1
W1
W1
FIG. 1.72
FIG. 1.73
18
2.
2.1
FAULT FINDING
FAULT FINDING GUIDE
(FLOW-CHARTS)
It is possible to detect and correct any defect by using the standard fault
finding diagrams described in this chapter.
Model 24 MFFI
MAKE SURE THAT:
1. There is sufficient water in the system
2. The gas is turned on
3. The electrical supply is turned on
PUSH THE ON/OFF
BUTTON TO ON
NO
IS THE
POWER L.E.D. AND
DISPLAY ON?
YES
TABLE
I and II
DOES A STOP CODE
APPEAR ON THE DISPLAY?
POSITION OF THE SUMMER/
WINTER SELECTOR
SUMMER
COMFORT
SELECTOR ON/OFF:
green L.E.D. on
NO:
COMFORT OFF
YES
YES
NO
NO
NO
Flow
temperature
>50°C
YES
YES
D.H.W.
IS BEING
DRAWN?
COMFORT
SELECTOR ON/OFF:
green L.E.D. on
NO:
COMFORT OFF
Flow
temperature
<40°C
NO
Flow
temperature
>50°C
WINTER
YES: COMFORT ON
YES: COMFORT ON
Flow
temperature
<40°C
1. Check the fuses
2. Check the power supply to
the control panel
3. Check/replace the
ON/OFF button
4. Check the connection between
the main and display P.C.B.s
5. Check/replace the
main and display P.C.B.s
YES
YES
NO
D.H.W.
IS BEING
DRAWN?
NO
YES
MUST
THE TIME CLOCK
AND/OR ROOM THERMOSTAT
BE ACTIVATED?
NO
BUILT-IN
ELECTRONIC
ANTI-FROST DEVICE:
Is there a condition for it to be active?
(- flow temp. < 3°C
- outdoor temp. < -3°C (outdoor sensor optional)
- Jumper 4 selects the pump
for continuous
operation)
YES
YES
NO
BUILT-IN
ELECTRONIC
ANTI-FROST DEVICE:
Is there a condition for it to be active?
(- flow temp. < 3°C
- outdoor temp. < -3°C (outdoor sensor optional)
- Jumper 4 selects the pump
for continuous
operation)
NO
THERE IS NO CALL FOR PUMP OPERATION
THERE IS NO CALL FOR PUMP OPERATION
A
19
Model 24 RFFI System
MAKE SURE THAT:
1. There is sufficient water in the system
2. The gas is turned on
3. The electrical supply is turned on
PUSH THE ON/OFF
BUTTON TO ON
NO
IS THE
POWER L.E.D. AND
DISPLAY ON?
TABLE
I and II
YES
DOES A STOP CODE
APPEAR ON THE DISPLAY?
POSITION OF THE SUMMER/
WINTER SELECTOR
SUMMER
C.H. ONLY
SELECTOR
ON/OFF
ON (green L.E.D. on):
cylinder excluded
1. Check the fuses
2. Check the power supply to
the control panel
3. Check/replace the
ON/OFF button
4. Check the connection between
the main and display P.C.B.s
5. Check/replace the
main and display P.C.B.s
WINTER
OFF (green L.E.D. off):
cylinder active
OFF (green L.E.D. off):
cylinder active
The
C.H. flow
temperature
is lower than 80°C
and the temperature of the
cylinder is at least 5°C
below the one
selected.
The
C.H. flow
temperature
is lower than 80°C
and the temperature of the
cylinder is at least 5°C
below the one
selected.
YES YES
NO
C.H. ONLY
SELECTOR
ON/OFF
ON (green L.E.D. on):
cylinder excluded
NO
MUST
THE TIME CLOCK
AND/OR ROOM THERMOSTAT
BE ACTIVATED?
YES
NO
BUILT-IN
ELECTRONIC
ANTI-FROST DEVICE:
Is there a condition for it to be active?
(- flow temp. < 3°C
- outdoor temp. < -3°C (outdoor sensor optional)
- Jumper 4 selects the pump
for continuous
operation)
YES
YES
NO
NO
THERE IS NO CALL FOR PUMP OPERATION
THERE IS NO CALL FOR PUMP OPERATION
A
20
BUILT-IN
ELECTRONIC
ANTI-FROST DEVICE:
Is there a condition for it to be active?
(- flow temp. < 3°C
- outdoor temp. < -3°C (outdoor sensor optional)
- Jumper 4 selects the pump
for continuous
operation)
Model 24 MFFI/24RFFI System
A
IS THE
PUMP RUNNING?
NO
YES
POWER TO
THE PUMP?
YES
IS
THE MAIN
CIRCUIT FLOW SWITCH
WORKING CORRECTLY?
A21: does not close
A22: does not open
NO
1. Check if there is air in
the system
2. Check the main circuit flow
switch operation
3. Check the pressure on the
water gauge and fill system
to 1 bar
NO
1. Check pump cable
2. Check/replace
main P.C.B.
YES
Release/replace
pump
YES
Push the
RESET button
B
21
Model 24 MFFI/24RFFI System
B
IS THE FAN
RUNNING?
NO
DOES CODE
A33 APPEAR?
YES
NO
Replace
the main P.C.B.
IGNITION
SPARKS ARE GENERATED
REGULARLY?
NO
YES
1. Check the fan cable
2. Replace the fan
3. Replace the main P.C.B.
1. Check/replace ignition
electrode
2. Check ignition cable
3. Check/replace the main P.C.B.
YES
IS THE BURNER
ALIGHT?
YES
1. Check the power supply
of the gas valve.
2. Check for an air
pressure signal
NO 3. Check the gas pressure
on the burner
4. Check the soft-light
adjustment
5. Replace the gas valve
6. Check/replace the
main P.C.B.
BOILER HAS
SHUTDOWN?
YES
1. Table II
2. Press RESET
IS
THERE STILL
A PROBLEM?
NO
NORMAL
OPERATION
22
YES
1. Table III
NO
TABLE I
DISPLAY
A01
A02
A03
A07
A19
A20
A21
A22
A33
A99
CAUSE
Too many attempts to ignite on starting up
After three attempts at ignition, no increase in ∆T was detected
The heating flow temperature exceeds 100°C during operation
Too many failures to flame in one period during operation
The flame was detected after the gas valve had closed
The flame was detected before the gas valve opened
The flow switch does not close
The flow switch does not open
Problem with the fan
Problem with the electronic monitoring
TABLE II
DISPLAY
E03
E56
E66
E04
E05
E08
E20
E21
E22
E23
E64
E74
E99
CAUSE
Flow temperature over 100°C while boiler is not in operation
(stand-by)
Heating flow temperature probe in open circuit
Heating flow temperature probe
Domestic hot water temperature probe in open circuit
Domestic hot water temperature probe in short circuit
Under floor heating temperature probe in open circuit
Flame detected with gas valve closed
Error in the electrical connection (live and neutral crossed)
Problem with the 50Hz power supply
Flame detection electrode short-circuited
Heating return temperature probe in open circuit
Heating return temperature probe in short circuit
Problem within the electronic system
TABLE III
FAULTS
POSSIBLE CAUSES
1. Drawing D.H.W:
Radiators heat up in summer
mode
- faulty 3-way valve
2. Drawing D.H.W:
Insufficient hot water temperature
-
check
check
check
check
3. Drawing D.H.W:
Noisy operation
-
primary heat exchanger faulty or lime-scale deposits
low heating system water pressure
check gas pressures
check C.H./D.H.W. temperature probes
4. Decrease/increase heating circuit
pressure
-
check for leaks on the heating circuit
faulty filling-loop
faulty secondary heat exchanger
expansion vessel faulty
C.H./D.H.W. temperature probes
gas pressures
water flow rate
secondary heat exchanger
5. When cold water tap turned off, the - drop in pressure in the water mains, with
boiler ignites
consequent water hammer
6. Insufficient radiator temperature
- check C.H. temperature probe
- check by-pass
- check gas pressures
23
3. ELECTRICAL
DIAGRAMS
LEGEND:
A: JUMPER
When needed, the P.C.B. allows the different options to be selected by means of
a wire link.
The boiler has the following basic arrangement:
1 OPEN
2 CLOSED (jumper)
3 OPEN
4 OPEN
5 OPEN
6 OPEN
7 CLOSED
8 OPEN (MFFI); CLOSED (SYSTEM)
NOTE: under absolutely no circumstances must jumpers 2, 7 and 8 be removed.
The opening of such contacts will lead to boiler malfunction.
This is the factory configuration. It is recommended that this set-up not be
changed, unless under the following particular circumstances:
JUMPER 3: if the contact is closed, the Secondary Output (flying clamp
connected to connection C7; positions 1-9) controls a LPG valve
(optional).
JUMPER 4: if the contact is closed, the continuous operation of the pump is
selected. If the contact remains open, it has no effect and there is
no change in the operation of the boiler.
JUMPER 5: if the contact is closed, the signal transmitted by the connection of
the secondary output clasp (connected to C7; positions 1-9)
relates to a secondary pump (optional). If the contact remains
open, the output signal controls a zone valve (optional).
JUMPER 6: not used
JUMPER 7/8:
7
N.I.
I.
N.I.
I.
8
N.I.
N.I.
I.
I.
CONFIGURATION
Central heating only
MFFI
Not used
RFFI System
I = inserted (contact closed)
N.I = not inserted (contact open)
NOTE: it is essential that the operations involving setting of the jumpers be
carried out only with the device turned off.
B: Control microprocessor
C: Flame detection jumper (under no circumstances should this jumper be
moved from the 1-2 position)
D: Anti-cycling device (RA)
E: Maximum heating output regulation (PR)
F: Soft-light regulation (RLA)
G: Operating mode selector knob
H: Heating temperature adjustment
I: Domestic hot water temperature adjustment
J: Remote control module
K: Main microprocessor
L: Relay
M: Fuses (2 x 0.54 A SLOW)
N: Transformer (PRI: 230V-50Hz; SEK: 10V-0,8VA; SEK:10V-3,5VA; SEK:10V3,5VA;)
O: Fuses (2 x 3.15 A SLOW)
P: Earth
Q: Spark generator
R: Connection to the main P.C.B.
S: Comfort light
T: Programming keys
U: Comfort key
V: Alpha-numeric display
X: Set and reset key
W: Connection to PC
24
C1 = FAN
1:
“Hall” sensor power supply 12V (red)
2:
“Hall” sensor ground (blue)
3:
Not used
4:
Start of coil (black)
5:
“Hall” sensor input (white)
6:
End of coil (brown)
C2 = POWER SUPPLY
1:
Earth (yellow/green)
2:
Earth (yellow/green)
3:
Not connected
4:
Neutral (blue)
5:
Not connected
6:
Live (brown)
C3 = CONNECTION TO ROOMSTAT
1:
Input - 1
2:
Input - 2
C4 = TIMER
1:
3 V output
2:
Timer ground
3:
Timer output
4:
Not connected
C5 = REMOTE CONTROL (Bus+/Bus-)
1:
Input/output-1
2:
Input/output-2
C6 =
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
SENSOR CONNECTOR
Domestic hot water flow switch (grey)
Main circuit flow switch (grey)
Under floor heating thermostat (grey)
Heating flow sensor (grey)
Heating return sensor (grey)
Domestic hot water sensor (grey)
Not used: jumper
Outdoor sensor (grey)
Domestic hot water flow switch (grey)
Main circuit flow switch (grey)
Under floor heating thermostat (grey)
Flow sensor (grey)
Heating sensor (grey)
Domestic hot water sensor (grey)
Not used: under floor heating
Outdoor sensor (grey)
C7 =
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
EQUIPMENT CONNECTIONS
Secondary output (optional)
Gas valve (white)
3-way valve neutral (white)
Pump (white)
Ionisation (black)
Not connected
Ground
Pump earth (yellow/green)
Secondary output (optional)
Gas valve (brown)
3-way valve (domestic hot water) (brown)
3-way valve (heating) (brown)
Pump (brown)
Not connected
Earth
Gas valve earth (yellow/green)
25
ecoGENUS 24 MFFI - ecoGENUS 24 RFFI
26
4. SHORT SPARE
PARTS LIST
ecoGENUS - 24 MFFI
2
56 49 51 52 55 54
53 52 51 50 49
48
47 46
3
1
3
2
57
3
57
3
3
3
3
3
108
57
58
57
4
59
65 64
66
107
106
301
302
301
60
5
59
67
68
75
74
6
76
63 62
7
104
73
7
69
8
59
43
95
72
77
42
41
94
96
70
78
79
10
93
71
80
91
92
89
90
102
101
97
40
84
99
81
88
83
82
7
17
16
39
38
37
36
35
34
98
81
7
44
103
8
7
9
45
105
61
58
100
33
37
36
84
86
85
19
87
33
32
11
31
28
12
13
8 14 15 16 17 18
19
20
21
21
22
23
24
25
26
27
28
29
30
15
311
313
312
331
13
332
336
335
333
334
333
24 MFFI
27
ecoGENUS - 24 MFFI
28
Key
no.
G.C. part
no.
1
7
8
11
12
13
15
20
21
22
23
24
30
38
41
42
62
64
70
72
73
75
78
80
81
83
84
87
89
90
91
92
97
106
311
312
313
331
332
333
334
335
336
E25 417
164 225
164 338
E25 427
E25 429
378 814
E26 378
164 229
E26 819
E25 437
164 261
E26 657
E26 658
E25 518
164 230
164 282
379 079
E25 581
E24 077
ARISTON
Part No.
Description
Expansion vessel
Gasket 3/4"
Temperature probe (C.H.W.)
Motor (3-way valve)
Fixing clip (motor)
Flow group
Gas valve
Micro switch set (main flow & D.H.W.)
Return group
Manual vent cock
Safety valve 1/2" 3 bar)
Gasket 1/2"
Time clock
Pressure gauge
P.C.B. (display)
Gasket 1/4"
Electrode (ignition/detection)
Burner
Electrode cable (resistive)
Fan cable & sensor
Fan
Injector (G20)
O-ring gasket
Secondary exchanger (p-type 27kW)
O-ring (secondary exchanger)
Pump
Gasket 1"
Gasket 3/8"
Auto air vent
Condensate Trap
Cap (trap filling)
Gasket (airtight - condensate trap)
P.C.B. (main)
Main exchanger (aluminium)
D.H.W. actuator Kit
Heating pressure switch kit
Pressure cover
Central heating by-pass kit
D.H.W. pressure switch kit
Heating pressure switch kit
Pressure cover
3-way spring kit
Heating actuator bush
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
573294
573520
569236
997147
997077
998127
571438
998802
998144
573727
573172
573528
997207
571649
998765
569390
998672
998668
998459
998889
998888
998651
998077
998894
997206
997151
569387
573521
564264
998791
998792
573768
998801
998670
571444
571441
574248
998490
571987
571441
574248
571447
998013
ecoGENUS - 24 RFFI SYSTEM
2
57 50 52 53 56 55
54 53 52 51 50
49
48 47
3
1
3
2
58
3
58
3
3
3
3
3
106
58
59
58
4
66
67
105
104
60
65
301
302
301
61
5
60
76
7
68
69
75
74
6
64 63
7
102
73
70
8
46
103
62
59
45
101
8
60
44
7
93
71
91
9
72
77
94
89
90
80
43
42
92
87
88
100
99
95
41
86
79
40
39
38
37
36
35
96
97
7
78
7
19
10
80
18
11
11
12
84
83
82
81
98
34
38
37
85
34
33
7
32
29
13
14
15 16
8
17 18 19 20
23
21
22 21
23
24
25
21
26
27
28
29
30
31
17
331
14
336
335
332
333
333
334
24 RFFI SYSTEM
29
ecoGENUS - 24 RFFI SYSTEM
30
Key
no.
G.C. part
no.
1
7
8
12
13
14
17
21
23
24
25
31
39
42
43
63
65
71
73
75A
75B
79
80
84
86
87
88
90
91
95
104
331
332
333
334
335
336
E25 417
164 225
164 338
E25 427
E25 429
164 229
378 814
E26 378
E26 819
E25 437
164 261
E25 518
164 230
164 282
379 079
E24 077
ARISTON
Part No.
Description
Expansion vessel
Gasket 3/4"
Temperature probe (C.H.W.)
Motor (3- Way valve)
Fixing clip (motor)
Flow group
Gas valve
Gasket 1/2"
Return group
Manual vent cock
Safety valve 1/2" 3 bar)
Time clock
Pressure gauge
P.C.B. (display)
Gasket 1/4"
Electrode (ignition/detection)
Burner
Fan cable & sensor
Fan
Injector (G20)
Injector (G30)
Pump
Gasket 1"
Gasket 3/8"
Condensate Trap
Gasket (airtight - condensate trap)
Cap (trap filling)
Auto air vent
Electrode cable (resistive)
P.C.B. (main)
Main exchanger (aluminium)
D.H.W. pressure switch kit
Central heating by-pass kit
Heating pressure switch kit
Pressure cover
3-way spring kit
Heating actuator bush
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
573294
573520
569236
997147
997077
998456
571438
573528
997828
573727
573172
997207
571649
998765
569390
998672
998668
998889
998888
998651
998783
997151
569387
573521
998791
573768
998792
564254
998459
998801
998670
571987
571443
571441
574248
571447
998013
Manufacturer:
Merloni TermoSanitari SpA - Italy
Commercial subsidiary: MTS (GB) LIMITED
MTS Building
Hughenden Avenue
High Wycombe
Bucks HP13 5FT
Telephone: (01494) 755600
Fax: (01494) 459775
Internet: http://www.mtsgb.ltd.uk
E-mail: [email protected]
Technical Service Hot Line: (01494) 539579
SPARE PARTS EXPLODED VIEW
GAS WALL BOILERS
Models
ECOGENUS 24 MFFI
Edition 1 of 1 December 1999
2
56 49 51 52 55 54
53 52 51 50 49
48
47 46
3
1
3
2
57
3
57
3
3
3
3
3
108
57
58
57
4
65
66
59
64
107
106
301
302
301
60
5
59
67
68
75
74
6
76
63 62
7
104
73
7
69
8
59
43
95
72
77
42
41
94
96
70
78
79
10
93
71
80
91
92
89
90
102
101
97
40
84
99
81
88
83
82
7
17
16
39
38
37
36
35
34
98
81
7
44
103
8
7
9
45
105
61
58
100
33
37
36
84
86
85
19
87
33
32
11
31
28
12
13
8 14 15 16 17 18
20
19
code 998144
21
22
23
24
25
26
27
28
29
30
code 571438
311
313
312
code 998127
331
332
336
335
333
334
MODELS
CHARACTERISTICS
SERIAL NO:
VALIDITY
REF.
ECOGENUS 24 MFFI
METHANE
9933500098
A
333
PART. CODE DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
573294
573310
574302
573244
----------573520
569236
998655
998656
997147
997077
998127
570615
571438
565048
998665
573793
573824
998802
998144
573727
573172
573528
573311
998674
573302
998747
998661
997207
998772
998778
998751
999073
998766
998381
998739
571649
-----571562
998765
569390
-----999060
998676
998076
998075
574104
573247
-----573865
573330
573326
998474
573337
572984
570717
998666
998785
998782
998775
998672
998767
998668
998680
Expansion vessel
Expansion vessel insert
Casing support bracket (Plastic)
3/8" lock nut
Frame
Hydraulic group support
Gasket 3/4"
Temperature probe (C.H.W.)
Pipe (C.H. flow)
Pipe (gas valve/burner jet)
Motor (3-Way valve)
Fixing clip (motor)
Flow group
1/8" Brass plug
Gas valve
O-ring gasket (gas valve)
Union (gas valve)
Intake (pressure - control valve)
Bracket (M/Flow Micro Switch)
Micro switch set (main flow & D.H.W.)
Return group
Manual vent cock
Safety valve (1/2" 3 bar)
Gasket 1/2"
Pipe (expansion vessel)
Wiring (power supply)
Summer/Winter selector kit
Control knob kit
Door (instruction/time clock)
Time clock
On/off push button kit
Control panel (front)
Button (reset)
Cover (display)
Film (display)
Pin (front cover)
Fixing spring (front cover)
Pressure gauge
Control panel
Cable clamp
P.C.B. (display)
Gasket 1/4"
Cover (connectors)
Low voltage wiring
High voltage wiring
View window glass gasket
View window glass
Panel (sealed chamber - front)
Panel (sealed chamber - side)
Sealed chamber
Flue gasket
Air return cover
Flue intake plug
Flue exhaust manifold / header
Gasket (flue manifold)
Casing support bracket
Spring (fastening)
Nipple (gas - 3/4" M/M)
Dowel (M6x35)
View window glass
Retaining ring (D=16mm)
Electrode (Ignition/Detection)
Cap (electrodes)
Burner
Gasket (elbow)
REF.
NOTE
11
11
11
11
11
PART. CODE DESCRIPTION
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
998788
-----998786
998654
998459
999071
998889
998888
998681
998651
570772
998065
998077
998064
573295
573825
573576
997151
569387
998019
998567
573521
998413
564254
998791
998792
573768
998412
998787
998808
998784
998801
998382
569720
998653
569424
998460
998777
573766
-----998670
-----998423
Elbow (fan)
Flame mirror
Diaphragm (condensing boiler)
Pipe (C.H. return)
Electrode cable (resistive)
Pipe (fan suction silencer)
Fan cable & sensor
Fan
Gasket (fan inlet)
Injector (G20)
Cable holder
By-pass pipe
O-ring gasket
Spring (by-pass pipe)
Secondary exchanger (p-type 27kW)
O-Ring (secondary exchanger)
Compensation tube
Pump
Gasket 1"
Pipe (safety valve outlet)
Safety valve outlet pipe ring nut
Gasket 3/8"
Pipe (condensate - plastic)
Auto air vent
Condensate Trap
Cap (trap filling)
Gasket (airtight - condensate trap)
Pipe (drain - plastic)
Condensate tray (aluminium)
Gasket (adhesive - 10x5 mm)
Fixing nut (tray rear)
P.C.B. (main)
Grommet (regulation access)
Blind grommet
L.E.D. lens
On/off neon switch
Gasket (igniter insulation)
Aluminium inspection lid
Front cover gasket
Bottom fixing bracket
Main exchanger (aluminium)
Top fixing bracket
Lip gasket (D=66 mm)
301
302
998414
998478
Case panel (side)
Case panel (front)
311
312
313
571444
571441
574248
D.H.W. actuator Kit
Heating pressure switch kit
Pressure cover
331
332
333
334
335
336
998490
571987
571441
574248
571447
998013
Central heating by-pass kit
D.H.W. pressure switch kit
Heating pressure switch kit
Pressure cover
3-Way spring kit
Heating actuator bush
NOTE DESCRIPTION
11
Not supplied as a spare part
REF.
NOTE
11
11
11
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