Post on 20-Mar-2020
Ireland
Innovens EN
Wall-hung gas condensing boilers
MCA 15 - MCA 25MCA 25/28 MI
User Guide
300024159-001-B
Contents
1 Introduction ................................................................................................41.1 Symbols used .......................................................4
1.2 Abbreviations ........................................................4
1.3 General ..................................................................51.3.1 Manufacturer's liability .............................................51.3.2 Installer's liability .....................................................51.3.3 User's liability ..........................................................5
1.4 Certifications .........................................................6
2 Safety instructions and recommendations ..............................................72.1 Safety instructions ...............................................7
2.2 Recommendations ................................................8
3 Description ..................................................................................................93.1 Operating principle ...............................................9
3.1.1 Gas/air setting .........................................................93.1.2 Combustion .............................................................93.1.3 Heating and domestic hot water production ............9
3.2 Main parts ............................................................10
3.3 Control panel .......................................................113.3.1 Description of the keys ..........................................113.3.2 Description of the display ......................................123.3.3 Browsing in the menus ..........................................14
4 Operating the boiler .................................................................................164.1 Commissioning the boiler ..................................16
4.2 Reading out measured values ...........................16
4.3 Changing the settings ........................................184.3.1 Setting the set point temperatures ........................184.3.2 Selecting the operating mode ...............................194.3.3 Forcing domestic hot water production .................204.3.4 Setting the contrast and lighting on the
display ...................................................................204.3.5 Setting the time and date ......................................214.3.6 Selecting a timer programme ................................214.3.7 Customising a timer programme ...........................22
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4.4 Installation shutdown .........................................24
4.5 Frost protection ..................................................24
5 Checking and maintenance .....................................................................255.1 General instructions ...........................................25
5.2 Periodic checks ..................................................25
5.3 Filling the system ...............................................26
5.4 Bleeding the heating system .............................27
5.5 Draining the installation .....................................29
6 Troubleshooting .......................................................................................316.1 Anti-hunting ........................................................31
6.2 Messages (Code type Bxx or Mxx) ....................31
6.3 Faults (Code type Lxx or Dxx) ...........................33
7 Technical specifications ..........................................................................397.1 Technical specifications ....................................39
8 Energy savings .........................................................................................408.1 Energy-saving advice .........................................40
8.2 Recommendations ..............................................40
9 Warranty ....................................................................................................419.1 General ................................................................41
9.2 Warranty terms ...................................................41
Contents
2 23/08/2011 - 300024159-001-B
1 Introduction
1.1 Symbols used
In these instructions, various danger levels are employed to draw theuser's attention to particular information. In so doing, we wish tosafeguard the user's safety, obviate hazards and guarantee correctoperation of the appliance.
DANGER
Risk of a dangerous situation causing serious physicalinjury.
WARNING
Risk of a dangerous situation causing slight physicalinjury.
CAUTION
Risk of material damage.
Signals important information.
¼ Signals a referral to other instructions or other pages in theinstructions.
1.2 Abbreviations
4 3CE: Collective conduit for sealed boiler4 DHW: Domestic hot water4 Interscenario switch: Home automation switch that can be used
to centralise and control several scenarios4 Hi: Lower heating value LHV (Nett)4 Hs: Higher heating value HHV (Gross)4 IOBL: Carrier current home automation bus4 PPS: Polypropylene hardly inflammable4 PCU: Primary Control Unit - PCB for managing burner operation4 PSU: Parameter Storage Unit - Parameter storage for PCBs
PCU and SU4 SCU: Secondary Control Unit - control panel PCB4 SU: Safety Unit - Safety PCB4 3WV: 3-way valve
MCA 15 - MCA 25 MCA 25/28 MI 1. Introduction
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1.3 General
1.3.1. Manufacturer's liability
Our products are manufactured in compliance with the requirementsof the various applicable European Directives. They are therefore
delivered with [ marking and all relevant documentation.
In the interest of customers, we are continuously endeavouring tomake improvements in product quality. All the specifications stated inthis document are therefore subject to change without notice.
Our liability as the manufacturer may not be invoked in the followingcases:
4 Failure to abide by the instructions on using the appliance.4 Faulty or insufficient maintenance of the appliance.4 Failure to abide by the instructions on installing the appliance.
1.3.2. Installer's liability
The installer is responsible for the installation and inital start up of theappliance. The installer must respect the following instructions:
4 Read and follow the instructions given in the manuals providedwith the appliance.
4 Carry out installation in compliance with the prevailing legislationand standards.
4 Perform the initial start up and carry out any checks necessary.4 Explain the installation to the user.4 If a maintenance is necessary, warn the user of the obligation to
check the appliance and maintain it in good working order.4 Give all the instruction manuals to the user.
1.3.3. User's liability
To guarantee optimum operation of the appliance, the user mustrespect the following instructions:
4 Read and follow the instructions given in the manuals providedwith the appliance.
4 Call on qualified professionals to carry out installation and initialstart up.
4 Get your fitter to explain your installation to you.4 Have the required checks and services done.4 Keep the instruction manuals in good condition close to the
appliance.
1. Introduction MCA 15 - MCA 25 MCA 25/28 MI
5 23/08/2011 - 300024159-001-B
This appliance is not intended to be used by persons (includingchildren) whose physcial, sensory or mental capacity is impaired orpersons with no experience or knowledge, unless they have thebenefit, through the intermediary of a person responsible for theirsafety, of supervision or prior instructions regarding use of theappliance. Care should be taken to ensure that children do not playwith the appliance.
1.4 Certifications
CE identification no PIN 0063BT3444NOx classification 5 (EN 297 pr A3, EN 656)Type of connection Chimney: B23 , B33
Flue gas outlet: C13 , C33, C43, C53, C63, C83 , C93
MCA 15 - MCA 25 MCA 25/28 MI 1. Introduction
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2 Safety instructions andrecommendations
2.1 Safety instructions
DANGER
If you smell gas:
1. Do not use a naked flame, do not smoke, do notoperate electrical contacts or switches ( doorbell,light, motor, lift, etc..).
2. Shut off the gas supply.3. Open the windows.4. Evacuate the premises.5. Call your fitter.
DANGER
If you smell flue gases:
1. Switch the appliance off.2. Open the windows.3. Evacuate the premises.4. Call your fitter.
WARNING
Depending on the settings of the appliance:
4 The temperature of the flue gas conduits may exceed60°C.
4 The temperature of the radiators may reach 85°C.4 The temperature of the domestic hot water may reach
65°C.
CAUTION
Do not neglect to service the appliance:4 For completely safe and optimum operation, you
must have your boiler regularly serviced by anapproved installer.
2. Safety instructions and recommendations MCA 15 - MCA 25 MCA 25/28 MI
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2.2 Recommendations
WARNING
Only qualified professionals are authorised to work on theappliance and the installation.
4 Regularly check the water pressure in the installation (minimumpressure 0,8 bar, recommended pressure between 1,5 and 2 bar).
4 Keep the appliance accessible at all times.4 Never remove or cover labels and rating plates affixed to the
appliance. Labels and rating plates must be legible throughout theentire lifetime of the appliance.
4 The appliance should be on Summer or Antrifreeze mode ratherthan switched off to guarantee the following functions:- Anti blocking of pumps- Frost protection
MCA 15 - MCA 25 MCA 25/28 MI 2. Safety instructions and recommendations
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3 Description
3.1 Operating principle
3.1.1. Gas/air setting
The casing fitted to the boiler is also used as an air box. Air is suckedin by the fan and gas injected into the venturi by the fan intake. Thefan rotation speed is set according to the settings parameters, thethermal energy requirement and the temperatures measured by thetemperature sensors. The gas and air are mixed in the venturi. Thegas/air ratio ensures that the quantities of gas and air are adjusted toeach other. This provides optimum combustion on the entire outputrange. The gas/air mixture is fed into the burner on top of theexchanger.
3.1.2. Combustion
The burner heats the heating water circulating in the heatexchanger. At a return temperature lower than around 55°C, the fluegases cool down to a temperature lower than the dew point, thuscausing the condensation of the water vapour contained in the fluegases in the back side of the heat exchanger. The heat releasedduring this condensation process (the latent heat or condensing heat)is also transferred to the heating water. The cooled combustion gasesare evacuated via the combustion gas outlet flue. The condensationwater is evacuated via a siphon.
3.1.3. Heating and domestic hot water production
On heating and domestic hot water production type boilers, anintegrated plate exchanger heats the domestic water. A 3-way valvedetermines whether the heated water is fed into the heating systemor the plate exchanger. A pick-up sensor signals that a hot water tapis being opened. This signal is transmitted to the control panel, whichthen switches the 3-way valve to the hot water position and trips theheating pump. The 3-way valve is spring-loaded but only consumeselectricity when it switches to another position.
The heating water reheats the domestic water in the plateexchanger. In comfort mode, if there is no hot water draw-off, theboiler handles the periodic reheating of the plate exchanger. Anylimescale particles are kept out of the plate exchanger by a self-cleaning water filter (self-cleans once every 76 hours).
3. Description MCA 15 - MCA 25 MCA 25/28 MI
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3.2 Main parts
1 Flue gas discharge pipe2 Casing/air box3 Outlet for measuring combustion gases4 Mixer pipe5 Heating flow hose6 Air intake silencer7 Box for the control PCBs8 Combined venturi and gas valve unit9 Flow end hydrobloc10 Safety valve outlet pipe11 Siphon12 Control panel13 Shunt pump14 Return end hydrobloc15 Plate heat exchanger (DHW circuit) (Only on models with
domestic hot water production)16 3-way valve17 Condensate receiver tank18 Fan19 Heat exchanger (Heating circuit)20 Expansion vessel21 Ignition/ionization electrode22 Air intake
T001867-C
2
15
14
13
16
17
18
19
20
21
3
4
5
6
7
8
9
10
11
12
1 22
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3.3 Control panel
3.3.1. Description of the keys
A Temperature setting key (heating, DHW, swimming pool)B Operating mode selection keyC DHW override keyD Key to access the parameters reserved for the installerE Keys on which the function varies as and when selections
are madeF Rotary setting button:
4 Turn the rotary button to scroll through the menus ormodify a value
4 Press the rotary button to access the menu selectedor confirm a value modification
A0
00
86
6-A
bar
STD t
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
A
B
C
D E F
( '
3. Description MCA 15 - MCA 25 MCA 25/28 MI
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3.3.2. Description of the display
n Key functions
> Access to the various menus
( Used to scroll through the menus
' Used to scroll through the parameters? The symbol is displayed when help is available
f Used to display the curve of the parameter selectedSTD Reset of the time programmes
b Selection of comfort mode or selection of the days to beprogrammed
v Selection of reduced mode or deselection of the days tobe programmed
j Back to the previous levelESC Back to the previous level without saving the
modifications made
t Manual reset
n Flame output level
C002705-A
The whole symbol flashes: The burner starts up but theflame is not yet present
C002704-A
Part of the symbol flashes: Output is increasing
C002703-A
Steady symbol: The required output has been reached
C002702-A
Part of the symbol flashes: Output is dropping
bar
r
STD( ' t
0 2 4 6 8 10 12 14 16 18 22 2420
C002696-A
pb AUTOx c rjLg m
bar
STD t
0 2 4 6 8 10 12 14 16 18 22 2420
C002701-B
pb AUTOx c rjMg m
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n Operating modes
p Summer mode: The heating is off. Domestic hot watercontinues to be produced
b WINTER mode: Heating and domestic hot water working
AUTO Operation in automatic mode according to the timerprogramme
x Comfort mode: The symbol is displayed when a DAYoverride (comfort) is activated
4 Flashing symbol: Temporary override4 Steady symbol: Permanent override
m Reduced mode: The symbol is displayed when a NIGHToverride (reduced) is activated
4 Flashing symbol: Temporary override4 Steady symbol: Permanent override
g Holiday mode: The symbol is displayed when a HOLIDAYoverride (antifreeze) is activated
4 Flashing symbol: Holiday mode programmed4 Steady symbol: Holiday mode active
m Manual mode
n System pressure
bar Pressure indicator: The symbol is displayed when a waterpressure sensor is connected.
4 Flashing symbol: The quantity of water is insufficient.4 Steady symbol: The quantity of water is sufficient.
l Water pressure level
4 R : 0,9 to 1,1 bar4 E : 1,2 to 1,5 bar4 Z : 1,6 to 1,9 bar4 A : 2,0 to 2,3 bar4 l : > 2,4 bar
bar
STD t
0 2 4 6 8 10 12 14 16 18 22 2420
C002697-B
pb AUTOx c rjMg m
bar
STD t
0 2 4 6 8 10 12 14 16 18 22 2420
C002698-B
pb AUTOx c rjMg m
bar
STD t
0 2 4 6 8 10 12 14 16 18 22 2420
C002708-A
pb AUTOx c rjMg m
3. Description MCA 15 - MCA 25 MCA 25/28 MI
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n Domestic Hot Water override
A bar is displayed when a DHW override is activated:
4 Flashing bar: Temporary override4 Steady bar: Permanent override
n Other information
r The symbol is displayed when domestic hot waterproduction is running.
w Valve indicator: The symbol is displayed when a 3-wayvalve is connected.
4 x : 3-way valve opens4 c : 3-way valve closes
M The symbol is displayed when the pump is operating.
Name of the circuit for which the parameters aredisplayed.
3.3.3. Browsing in the menus
1. To select the desired menu, turn the rotary button.2. To access the menu, press the rotary button.
To go back to the previous display, press the key j.
3. To select the desired parameter, turn the rotary button.4. To modify the parameter, press the rotary button.
To go back to the previous display, press the key j.
bar
STD t
0 2 4 6 8 10 12 14 16 18 22 2420
C002707-A
pb AUTOx c rjMg m
bar
STD t
0 2 4 6 8 10 12 14 16 18 22 2420
C002699-B
pb AUTOx c rjMg m
bar
1
1
2
2
rc
STD( ' t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjLg m
#MEASURES
#CHOICE TIME PROG.
#TIME PROGRAM
#SETTING
#TIME .DAYa
C002220-B-04
bar
1
1
2
2
rc
STD( ' t
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0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjLg m
CURRENT PROG.B
CURRENT PROG.C
P2
P3
a
C002221-C-04
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23/08/2011 - 300024159-001-B 14
5. To modify the parameter, turn the rotary button.6. To confirm, press the rotary button.
To cancel, press key h.
7. To go back to the main display, press key j2 times.
It is possible to use the ( and ' keys instead of the rotarybutton.
bar
1
1
2
2
rc
STD( ' t
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0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjLg m
CURRENT PROG.C"Choice of the timeprogram applied C"
P4
a
C002222-C-04
bar
1
1
2
2
rc
STD( ' t
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0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
LUNDI 11:45
C002224-D-04
2x
3. Description MCA 15 - MCA 25 MCA 25/28 MI
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4 Operating the boiler
4.1 Commissioning the boiler
1. Check the water pressure in the installation shown on the controlpanel display.
If the water pressure is lower than 0,8 bar, more watershould be added. If necessary, top up the water level in theheating system (recommended hydraulic pressurebetween 1,5 and 2,0 bar).¼ See chapter: "Filling the system", page 26
2. Open the gas valve on the boiler.3. Turn on the boiler using the on/off switch.
4. The first time the boiler is powered up, the #LANGUAGE menu isdisplayed. Select the desired language by turning the rotarybutton.
5. To confirm, press the rotary button.The boiler will begin an automatic venting-programme (which lastsapprox. 3 minutes) and will do this every time the power supply isisolated. If there is a problem, the error is displayed on the screen.
4.2 Reading out measured values
The various values measured by the appliance are displayed in the#MEASURES menu.
1. To access user level: Press the > key.2. Select the menu #MEASURES.
4 Turn the rotary button to scroll through the menus ormodify a value.
4 Press the rotary button to access the menu selectedor confirm a value modification.
¼ For a detailed explanation of menu browsing, referto the chapter: "Browsing in the menus", page 14.
C002366-B
Français - Deutsch - English - Italiano - Espanol - Nederlands- Pycck - Polski - Türk -
bar
1
1
2
2
rc
STD( ' t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb x c rg m
ÿLANGUE FRANCAIS
C002286-C
bar
1
1
2
2
rc
STD( ' t
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0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
SUNDAY 11:45
C002219-D-04
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23/08/2011 - 300024159-001-B 16
User level - #MEASURES menu
Parameter Description UnitOUTSIDE TEMP. Outside temperature °CROOMTEMP. A (1) Room temperature of circuit A °C
ROOMTEMP. B (1) Room temperature of circuit B °C
ROOMTEMP. C (1) Room temperature of circuit C °CBOILER TEMP. Water temperature in the boiler °CPRESSURE Water pressure in the installation barWATER TEMP. (1) Water temperature in the DHW tank °C
INST DWH TEMP. (1) Instant hot water temperature °C
STOR.TANK.TEMP (1) Water temperature in the storage tank °CDCW TEMPERATURE Domestic cold water temperature °CSWIMMING P.T.B (1) Water temperature of the swimming pool on circuit B °C
SWIMMING P.T.C (1) Water temperature of the swimming pool on circuit C °C
OUTLET TEMP. B (1) Temperature of the flow water in circuit B °C
OUTLET TEMP. C (1) Temperature of the flow water in circuit C °C
SYSTEM TEMP. (1) Temperature of the system flow water if multi-generator °C
T.DHW BOTTOM (1) Water temperature in the bottom of the DHW tank °C
TEMP.TANK AUX (1) Water temperature in the second DHW tank connected to the AUX circuit °C
DHW A TEMP. (1) Water temperature in the second DHW tank connected to circuit A °CBACK TEMP Temperature of the boiler return water °CWIND SPEED Fan rotation speed rpmPOWER Instantaneous boiler output (0%: Burner off or running at minimum output) %CURRENT (µA) Ionization current µANB IMPULS. Number of burner start-ups (not restartable)
The meter is incremented by 8 every 8 start-ups
RUNTIME Number of burner operation hours (not restartable)The meter is incremented by 2 every 2 hours
h
IN 0-10V (1) Voltage at input 0-10 V VSEQUENCE Control system sequence CTRL Software control number (1) The parameter is only displayed for the options, circuits or sensors actually connected.
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4.3 Changing the settings
4.3.1. Setting the set point temperatures
To set the various heating, DHW and swimming pool temperatures,proceed as follows:
1. Press the C key.2. To select the desired parameter, turn the rotary button.3. To modify the parameter, press the rotary button.
To go back to the previous display, press the key j.4. To modify the parameter, turn the rotary button.5. To confirm, press the rotary button.
To cancel, press key h.
Menu C
Parameter Adjustment range Description Factory setting
DAY TEMP. A 5 to 30 °C Desired room temperature in comfort periods on circuitA 20 °C
NIGHT TEMP. A 5 to 30 °C Desired room temperature in reduced periods on circuitA 16 °C
DAY TEMP. B (1) 5 to 30 °C Desired room temperature in comfort periods on circuitB 20 °C
NIGHT TEMP. B(1) 5 to 30 °C Desired room temperature in reduced periods on circuit
B 16 °C
DAY TEMP. C (1) 5 to 30 °C Desired room temperature in comfort periods on circuitC 20 °C
NIGHT TEMP. C(1) 5 to 30 °C Desired room temperature in reduced periods on circuit
C 16 °C
WATER TEMP. (1) MCA 15 - MCA 25: 10 to 80 °CMCA 25/28 MI : 40 to 65 °C
Desired domestic hot water temperature in the DHWcircuit 55 °C
TEMP.TANK AUX(1) 10 to 80 °C Desired domestic hot water temperature in the auxiliary
circuit 55 °C
DHW A TEMP. (1) 10 to 80 °C Desired domestic hot water temperature in circuit A 55 °CSWIMMING P.T.B(1) 5 to 39 °C Desired temperature for swimming pool B 20 °C
SWIMMING P.T.C(1) 5 to 39 °C Desired temperature for swimming pool C 20 °C
(1) The parameter is only displayed for the options, circuits or sensors actually connected.
MODE
C002266-A
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4.3.2. Selecting the operating mode
To select an operating mode, proceed as follows:
1. Press the MODE key.2. To select the desired parameter, turn the rotary button.3. To modify the parameter, press the rotary button.
To go back to the previous display, press the key j.4. To modify the parameter, turn the rotary button.5. To confirm, press the rotary button.
To cancel, press key h.
Menu MODEParameter Adjustment range Description Factory settingAUTOMATIQUE The comfort ranges are determined by the timer programme.DAY 7/7, xx:xx Comfort mode is forced until the time indicated or all the time (7/7). Present time + 1
hourNIGHT 7/7, xx:xx Reduced mode is forced until the time indicated or all the time (7/7). Present time + 1
hourHOLIDAYS 7/7, 1 to 365 The antifreeze mode is active on all boiler circuits.
Number of days' holiday: xx (1)
heating OFF: xx:xx (1)
Restarting: xx:xx (1)
Present date + 1day
SUMMER The heating is off.Domestic hot water continues to be produced.
MANUEL The generator operates according to the set point setting. All of thepumps operate. Option of setting the set point by simply turning therotary button.
FORCE AUTO YES / NO An operating mode override is activated on the remote control(option).To force all circuits to run on AUTOMATIQUE mode, select YES.
(1) The start and end days and the number of days are calculated in relation to each other.
MODE
C002267-A
4. Operating the boiler MCA 15 - MCA 25 MCA 25/28 MI
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4.3.3. Forcing domestic hot water production
To force domestic hot water production, proceed as follows:
1. Press the r key.2. To select the desired parameter, turn the rotary button.3. To modify the parameter, press the rotary button.
To go back to the previous display, press the key j.4. To modify the parameter, turn the rotary button.5. To confirm, press the rotary button.
To cancel, press key h.
Menu rParameter Description Factory settingAUTOMATIQUE The domestic hot water comfort ranges are determined by the timer programme. COMFORT Domestic hot water comfort mode is forced until the time indicated or all the time (7/7). Present time + 1 hour
4.3.4. Setting the contrast and lighting on thedisplay
1. To access user level: Press the > key.2. Select the menu #SETTING.
4 Turn the rotary button to scroll through the menus ormodify a value.
4 Press the rotary button to access the menu selectedor confirm a value modification.
¼ For a detailed explanation of menu browsing, referto the chapter: "Browsing in the menus", page 14.
3. To set the following parameters:
User level - Menu #SETTING
Parameter Adjustment range Description Factory setting Customer settingCONTRAST DISP. Adjusting the display contrast. BACK LIGHT COMFORT The screen is illuminated continuously in
daytime periods.ECO
ECO The screen is illuminated for 2 minuteswhenever pressed.
MODE
C002268-A
bar
1
1
2
2
rc
STD( ' t
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0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
SUNDAY 11:45
C002219-D-04
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4.3.5. Setting the time and date
1. To access user level: Press the > key.2. Select the menu #TIME .DAY.
4 Turn the rotary button to scroll through the menus ormodify a value.
4 Press the rotary button to access the menu selectedor confirm a value modification.
¼ For a detailed explanation of menu browsing, referto the chapter: "Browsing in the menus", page 14.
3. To set the following parameters:
User level - Menu #TIME .DAY
Parameter Adjustment range Description Factory setting Customer settingHOURS 0 to 23 Hours setting MINUTE 0 to 59 Minutes setting DAY Monday to Sunday Setting the day of the week DATE 1 to 31 Day setting MONTH January to December Month setting YEAR 2008 to 2099 Year setting SUM. TIME: AUTO automatic switch to summer time on the last Sunday
in March and back to winter time on the last Sundayin October.
AUTO
MANU for countries where the time change is done onother dates or is not in use.
4.3.6. Selecting a timer programme
1. To access user level: Press the > key.2. Select the menu #CHOICE TIME PROG..
4 Turn the rotary button to scroll through the menus ormodify a value.
4 Press the rotary button to access the menu selectedor confirm a value modification.
¼ For a detailed explanation of menu browsing, referto the chapter: "Browsing in the menus", page 14.
3. To select the desired parameter.
User level - Menu #CHOICE TIME PROG.
Parameter Adjustment range DescriptionCURRENT PROG.A P1 / P2 / P3 / P4 Comfort programme activated
(Circuit A)CURRENT PROG.B P1 / P2 / P3 / P4 Comfort programme activated
(Circuit B)CURRENT PROG.C P1 / P2 / P3 / P4 Comfort programme activated
(Circuit C)
bar
1
1
2
2
rc
STD( ' t
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0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
SUNDAY 11:45
C002219-D-04
bar
1
1
2
2
rc
STD( ' t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
SUNDAY 11:45
C002219-D-04
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4. Assign the desired timer programme (P1 to P4) to the circuit withthe rotary button.
4.3.7. Customising a timer programme
1. To access user level: Press the > key.2. Select the menu #TIME PROGRAM.
4 Turn the rotary button to scroll through the menus ormodify a value.
4 Press the rotary button to access the menu selectedor confirm a value modification.
¼ For a detailed explanation of menu browsing, referto the chapter: "Browsing in the menus", page 14.
3. To select the desired parameter.
User level - Menu #TIME PROGRAM
Parameter Time schedule DescriptionTIME PROG.A PROG P2 A
PROG P3 APROG P4 A
Timer programme for circuit A
TIME PROG.B PROG P2 BPROG P3 BPROG P4 B
Timer programme for circuit B
TIME PROG.C PROG P2 CPROG P3 CPROG P4 C
Timer programme for circuit C
TIME PROG.DHW DHW circuit timer programmeTIME PROG.AUX Auxiliary circuit timer programme
4. To select a timer programme to be modified.5. To select to days for which the timer programme is to be
modified:Turn the rotary button to the left until you reach the day desired.To confirm, press the rotary button.
6. b : Day selectionPress key b / v until the symbol b is displayed.Turn the rotary button to the right to select the day(s) desired.v : Cancelling the day selectionPress key b / v until the symbol v is displayed.Turn the rotary button to the right to cancel selection of the relevantday(s).
7. When the days desired for the programme have been selected,press the rotary button to confirm.
bar
1
1
2
2
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STD( ' t
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0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
SUNDAY 11:45
C002219-D-04
bar
1
1
2
2
rc
STD( ' t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjLg m
PROG P2 C Mo Tu We Th Fr Sa Su"Display of the timeprogram. To continuepush on the button" a
C002228-B-04
bar
1
1
2
2
rc
STD( ' t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjLg m
PROG P2 C Mo Tu We Th Fr Sa Su"Select the days toprogram" a
C002229-C-04
MCA 15 - MCA 25 MCA 25/28 MI 4. Operating the boiler
23/08/2011 - 300024159-001-B 22
8. To define the timer ranges for the comfort mode and reducedmode:Turn the rotary button to the left until 0:00 is displayed. The firstsegment of the graphic bar for the timer programme flashes.
9. b : Comfort mode selectionPress key b / v until the symbol b is displayed.To select a comfort time range, turn the rotary button to the right.v : Reduced mode selectionPress key b / v until the symbol v is displayed.To select a reduced time range, turn the rotary button to the right.
10.When the times for the comfort mode have been selected, pressthe rotary button to confirm.
User level - Menu #TIME PROGRAM
Day Comfort periods / Filling enabled:P1_______________
P2 _______________ P3 _______________ P4 _______________
TIME PROG.A Monday 6:00 to 22:00 Tuesday 6:00 to 22:00 Wednesday 6:00 to 22:00 Thursday 6:00 to 22:00 Friday 6:00 to 22:00 Saturday 6:00 to 22:00 Sunday 6:00 to 22:00
TIME PROG.B Monday 6:00 to 22:00 Tuesday 6:00 to 22:00 Wednesday 6:00 to 22:00 Thursday 6:00 to 22:00 Friday 6:00 to 22:00 Saturday 6:00 to 22:00 Sunday 6:00 to 22:00
TIME PROG.C Monday 6:00 to 22:00 Tuesday 6:00 to 22:00 Wednesday 6:00 to 22:00 Thursday 6:00 to 22:00 Friday 6:00 to 22:00 Saturday 6:00 to 22:00 Sunday 6:00 to 22:00
TIME PROG.DHW Monday Tuesday Wednesday Thursday Friday Saturday Sunday
bar
1
1
2
2
rc
STD( ' t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjLg m
PROG P2 C Mo Tu We Th Fr Sa SuSet the time program. a
C002230-E-04
06:00
06:00
4. Operating the boiler MCA 15 - MCA 25 MCA 25/28 MI
23 23/08/2011 - 300024159-001-B
User level - Menu #TIME PROGRAM
Day Comfort periods / Filling enabled:P1_______________
P2 _______________ P3 _______________ P4 _______________
TIME PROG.AUX Monday Tuesday Wednesday Thursday Friday Saturday Sunday
4.4 Installation shutdown
CAUTION
Do not switch off the boiler. If the central heating systemis not used for a long period, we recommend activating theHOLIDAYS mode.
4.5 Frost protection
When the heating water temperature in the boiler falls by too much,the integrated protection system in the boiler starts up. This protectionfunctions as follows:
4 If the water temperature is lower than 7°C, the heating pump startsup.
4 If the water temperature is lower than 4°C, the boiler starts up.4 If the water temperature is higher than 10°C, the boiler shuts down
and the heating pump continues to run for a short time.
CAUTION
4 The anitfreeze protection does not function if theboiler is switched off.
4 The integrated protection system only protects theboiler, not the installation. To protect the installation,set the appliance to HOLIDAYS mode.
The HOLIDAYS mode protects:
4 The installation if the outside temperature is lower than 3°C(factory setting).
4 The room temperature if a remote control is connected and theroom temperature is lower than 6 °C (factory setting).
4 The domestic hot water tank if the tank temperature is lowerthan 4 °C (the water is reheated to 10 °C).
To configure the holidays mode: ¼ See chapter: "Selecting theoperating mode", page 19.
MCA 15 - MCA 25 MCA 25/28 MI 4. Operating the boiler
23/08/2011 - 300024159-001-B 24
5 Checking and maintenance
5.1 General instructions
The boiler does not require a lot of maintenance. Nevertheless, werecommend having the boiler inspected and serviced at regularintervals.
4 Maintenance and cleaning of the boiler must be carried out at leastonce a year by a qualified technician.
4 Have the flues swept at least once a year or more, depending onthe regulations in force in your country.
CAUTION
4 Maintenance operations must be done by a qualifiedengineer.
4 We recommend taking out a maintenance contract.4 Only original spare parts must be used.
The boiler displays a message whenever maintenance is necessary.
1. When the message, REVISION, is displayed, press ? to displaythe installer's telephone number.
2. Contact the fitter.3. Have the required checks and services done.
5.2 Periodic checks
4 Check the water pressure in the installation.
If the water pressure is lower than 0,8 bar, more watershould be added. If necessary, top up the water level in theheating system (recommended hydraulic pressurebetween 1,5 and 2,0 bar).¼ See chapter: "Filling the system", page 26.
4 Carry out a visual check for the presence of any water leaks.
bar
1
1
2
2
rc
STD( ' t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
SUNDAY 11:45
TEMP. : 68°
PCU COM.FAIL D27
C002302-D-04
T001507-B
5. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI
25 23/08/2011 - 300024159-001-B
4 Open and close the radiator valves several times a year (thisprevents the valves from seizing up).
4 Clean the outside of the boiler using a damp cloth and a lightdetergent.
CAUTION
Only a qualified professional is authorised to clean theinside of the boiler.
5.3 Filling the system
1. Check the water pressure in the installation shown on the controlpanel display.
If the water pressure is lower than 0,8 bar, more watershould be added. If necessary, top up the water level in theheating system (recommended hydraulic pressurebetween 1,5 and 2,0 bar).
2. Open the valves on all radiators connected to the heating system.
3. Set the heating set point to as low a temperature as possible.4. Wait until the temperature drops below 40°C and the radiators
seem cold before filling the central heating system.
5. Open the cold water inlet and heating outlet valves.
1
2
3
4
T000181-B
1
2
3
4
T000181-B
T000185-A
T001620-A
MCA 15 - MCA 25 MCA 25/28 MI 5. Checking and maintenance
23/08/2011 - 300024159-001-B 26
6. Open the disconnector valves.
7. Close the disconnector valves when the manometer indicates apressure of 2 bar.
When water is added, air gets into the heating system.Degas the installation. After the air has been vented, thewater pressure can drop below the required level. Checkthe water pressure in the heating system. If the waterpressure is lower than 0,8 bar, more water should beadded.
8. After filling the installation, switch the boiler on.
Filling and bleeding the installation 2 times a year shouldbe sufficient to obtain an adequate hydraulic pressure. If itis often necessary to top up the installation with water,contact your fitter.
5.4 Bleeding the heating system
It is essential that you bleed any air in the calorifier, the conduits orthe taps to prevent the annoying noises likely to be produced duringheating or when tapping water. To do this, proceed as follows:
1. Open the valves on all radiators connected to the heating system.
2. Set the heating set point to as high a temperature as possible.3. Wait until the radiators are hot.
4. Switch the boiler off.
T001618-A
1
2
T001619-A
2
12 bar
1
2
3
4
T000181-B
T000184-A
5. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI
27 23/08/2011 - 300024159-001-B
5. Wait around 10 minutes until the radiators are cold.
6. Bleed the radiators. Start with the lower floors.
7. Open the bleed connection using the bleed key provided whilstkeeping a rag pressed against the connection.
T000185-A
T000854-A
3
1
4
5
2
T000217-A
MCA 15 - MCA 25 MCA 25/28 MI 5. Checking and maintenance
23/08/2011 - 300024159-001-B 28
8. Wait until water comes out of the bleed valve and then close thebleed connection.
CAUTION
The water may still be hot.9. Switch on the boiler. A vent cycle of a duration of around 3 minutes
is carried out automatically.10.After venting, check whether the pressure in the installation is still
sufficient.
If the water pressure is lower than 0,8 bar, more watershould be added. If necessary, top up the water level in theheating system (recommended hydraulic pressurebetween 1,5 and 2,0 bar).¼ See chapter: "Filling the system", page 26
11.Set the heating set point.
5.5 Draining the installation
It may become necessary to empty the water from the heating systemwhen the radiators have to be replaced, should there be a major waterleak or a risk of frost. To do this, proceed as follows:
1. Open the valves on all radiators connected to the heating system.
2. Switch off the boiler electrical power supply.3. Wait around 10 minutes until the radiators are cold.
T000218-A
1
2
3
4
T000181-B
T000185-A
5. Checking and maintenance MCA 15 - MCA 25 MCA 25/28 MI
29 23/08/2011 - 300024159-001-B
4. Connect an evacuation hose to the plug located at the lowestlevel. Place the end of the hose in a discharge sump or in a placewhere the water discharged from the valve can not do anydamage.
5. Open the filling/draw-off valve on the heating system. Vent theheating installation.
WARNING
The water may still be hot.6. When no more water comes out of the drainage plug, close the
drainage valve.T000858-A
MCA 15 - MCA 25 MCA 25/28 MI 5. Checking and maintenance
23/08/2011 - 300024159-001-B 30
6 Troubleshooting
6.1 Anti-hunting
When the boiler is in Anti-short-cycle operating mode, the symbol ?flashes.
1. Press the "?" key.The message Operation assured when the restart temperaturewill be reached is displayed. When the restart temperature isreached, operation will be guaranteed.
This message is not an error message but an item ofinformation.
6.2 Messages (Code type Bxx or Mxx)
In the case of failure, the control panel displays a message and acorresponding code.
1. Make a note of the code displayed.The code is important for the correct and rapid diagnosis of thetype of failure and for any technical assistance that may beneeded.
2. Switch the boiler off and switch back on.The boiler starts up again automatically when the reason for theblocking has been removed.
3. If the code is displayed again, correct the problem by following theinstructions in the table below:
Code Messages Description Checking / solutionB00 BL.PSU ERROR The PSU PCB is incorrectly
configuredParameter error on the PSU PCB
4 Contact the professional who takes care of maintenance ofthe appliance
B01 BL.MAX BOILER Maximum flow temperatureexceeded
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)B02 BL.HEATING
SPEEDThe increase in flow temperaturehas exceeded its maximum limit
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)4 Check the water pressureSensor error
4 Contact the professional who takes care of maintenance ofthe appliance
B07 BL.DT OUTL RET. Maximum difference between theflow and return temperatureexceeded
The water flow in the installation is insufficient
4 Check the circulation (direction, pump, valves)4 Check the water pressureSensor error
4 Contact the professional who takes care of maintenance ofthe appliance
6. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI
31 23/08/2011 - 300024159-001-B
Code Messages Description Checking / solutionB08 BL.RL OPEN The RL inlet on the PCU PCB
terminal block is openParameter error
4 Contact the professional who takes care of maintenance ofthe appliance
Bad connection
4 Contact the professional who takes care of maintenance ofthe appliance
B09 BL.INV. L/N 4 Contact the professional who takes care of maintenance of the applianceB10B11
BL.BL INPUTOPEN
The BL inlet on the PCU PCBterminal block is open
The contact connected to the BL inlet is open
4 Contact the professional who takes care of maintenance ofthe appliance
Parameter error
4 Contact the professional who takes care of maintenance ofthe appliance
Bad connection
4 Contact the professional who takes care of maintenance ofthe appliance
B13 BL. PCU COM Communication error with theSCU PCB
Bad connection
4 Contact the professional who takes care of maintenance ofthe appliance
SCU PCB not installed in the boiler
4 Contact the professional who takes care of maintenance ofthe appliance
B14 BL.WATER MIS. The water pressure is lower than0,8 bar
Not enough water in the circuit
4 Top up the installation with waterB15 BL.GAS PRESS Gas pressure too low Incorrect setting of the gas pressure switch on the SCU PCB
4 Check that the gas valve is fully opened4 Contact the professional who takes care of maintenance of
the applianceB16 BL.BAD SU The SU PCB is not recognised Wrong SU PCB for this boiler
4 Contact the professional who takes care of maintenance ofthe appliance
B17 BL.PCU ERROR The parameters saved on thePCU PCB are impaired
Parameter error on the PCU PCB
4 Contact the professional who takes care of maintenance ofthe appliance
B18 BL.BAD PSU The PSU PCB is not recognised Wrong PSU PCB for this boiler
4 Contact the professional who takes care of maintenance ofthe appliance
B19 BL.NO CONFIG The boiler has not beenconfigured
The PSU PCB has been changed
4 Contact the professional who takes care of maintenance ofthe appliance
B21 BL. COM SU Communication error betweenthe PCU and SU PCBs
Bad connection
4 Contact the professional who takes care of maintenance ofthe appliance
B22 BL.FLAME LOS No flame during operation No ionization current
4 Check that the gas valve is fully opened4 Contact the professional who takes care of maintenance of
the applianceB25 BL.SU ERROR Internal error on the SU PCB 4 Contact the professional who takes care of maintenance of
the appliance
MCA 15 - MCA 25 MCA 25/28 MI 6. Troubleshooting
23/08/2011 - 300024159-001-B 32
Code Messages Description Checking / solutionM04 REVISION A service is required The date programmed for the service has been reached
4 If the symbol ? flashes, press key ?. The installer's contactdetails are displayed.
4 Contact the professional who takes care of maintenance ofthe appliance
M05 REVISION A An A, B or C service is required The date programmed for the service has been reached
4 If the symbol ? flashes, press key ?. The installer's contactdetails are displayed.
4 Contact the professional who takes care of maintenance ofthe appliance
M06 REVISION BM07 REVISION C
M20 DISGAS A boiler vent cycle is underway Switching the boiler on
4 Wait 3 minutes FL.DRY.B XX
DAYSFloor drying is activeXX DAYS = Number of days' floordrying remaining.
Floor drying is underway. Heating on the circuits not concernedis shut down.
4 Contact the professional who takes care of maintenance ofthe appliance
FL.DRY.C XXDAYSFL.DRY.B+C XXDAYS
M23 CHANGE OUTSI.S The outside temperature sensoris defective.
Change the outside radio temperature sensor.
STOP N XX The shutdown is activeXX = Number of the activeshutdown
A shutdown is underway. The circuits selected for this stop arein Antifreeze mode during the period chosen.
6.3 Faults (Code type Lxx or Dxx)
In the event of operational failure, the control panel flashes anddisplays an error message and a corresponding code.
1. Make a note of the code displayed.The code is important for the correct and rapid diagnosis of thetype of failure and for any technical assistance that may beneeded.
2. Press the t key. If the code is displayed again, switch off the boilerand then switch it back on.
3. Press the ? key. Follow the instructions displayed to solve theproblem.
4. Consult the meaning of the codes in the table below:
bar
1
1
2
2
rc
STD( t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
SUNDAY 11:45
TEMP. : 68°
PCU. COM. FAIL. D27
C002604-B-04
bar
1
1
2
2
rc
STD( ' t
v
0 2 4 6 8 10 12 14 16 18 22 2420
pb AUTOx c rjMg m
SUNDAY 11:45
TEMP. : 68°
PCU COM.FAIL D27
C002302-D-04
6. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI
33 23/08/2011 - 300024159-001-B
Code Faults Causeof thefault
Description Checking / solution
L00 PSU FAIL PCU PSU PCB not connected Bad connectionPSU PCB faulty
4 Contact the professional who takes care ofmaintenance of the appliance
L01 PSU PARAM FAIL PCU The safety parameters are incorrect Bad connectionPSU PCB faulty
4 Contact the professional who takes care ofmaintenance of the appliance
L02 DEF.OUTLET S. PCU The boiler flow sensor has short-circuited
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
L03 DEF.OUTLET S. PCU The boiler flow sensor is on an opencircuit
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
L04 DEF.OUTLET S. PCU Boiler temp too low Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
No water circulation
4 Vent the air in the heating system4 Check the circulation (direction, pump,
valves)4 Check the water pressure
L05 STB OUTLET PCU Boiler temperature too high Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
No water circulation
4 Vent the air in the heating system4 Check the circulation (direction, pump,
valves)4 Check the water pressure
L06 BACK S.FAILURE PCU The return temperature sensor hasshort-circuited
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
L07 BACK S.FAILURE PCU The return temperature sensor is onan open circuit
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
L08 BACK S.FAILURE PCU Return temperature too low Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
No water circulation
4 Vent the air in the heating system4 Check the circulation (direction, pump,
valves)4 Check the water pressure
MCA 15 - MCA 25 MCA 25/28 MI 6. Troubleshooting
23/08/2011 - 300024159-001-B 34
Code Faults Causeof thefault
Description Checking / solution
L09 STB BACK PCU Return temperature too high Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
No water circulation
4 Vent the air in the heating system4 Check the circulation (direction, pump,
valves)4 Check the water pressure
L10 DEP-RET<MIN PCU Difference between the flow andreturn temperatures insufficient
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
No water circulation
4 Vent the air in the heating system4 Check the circulation (direction, pump,
valves)4 Check the water pressure
L11 DEP-RET>MAX PCU Difference between the flow andreturn temperatures too great
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
No water circulation
4 Vent the air in the heating system4 Check the circulation (direction, pump,
valves)4 Check the water pressure
L12 STB OPEN PCU Maximum boiler temperatureexceeded (STB thermostatmaximum)
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
No water circulation
4 Vent the air in the heating system4 Check the circulation (direction, pump,
valves)4 Check the water pressure
L14 BURNER FAILURE PCU 5 burner start-up failures No ignition
4 Contact the professional who takes care ofmaintenance of the appliance
Presence of the ignition arc but no flame formation
4 Check that the gas valve is fully opened4 Contact the professional who takes care of
maintenance of the appliancePresence of the flame but insufficient ionization(<3 µA)
4 Check that the gas valve is fully opened4 Contact the professional who takes care of
maintenance of the appliance
6. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI
35 23/08/2011 - 300024159-001-B
Code Faults Causeof thefault
Description Checking / solution
L16 PARASIT FLAME PCU Detection of a parasite flame Ionization current present when there should notbe a flameIgnition transformer defectiveGas valve defectiveThe burner remains very hot: CO2 too high
4 Contact the professional who takes care ofmaintenance of the appliance
L17 VALVE FAIL PCU Problem on the gas valve Bad connectionSU PCB faulty
4 Contact the professional who takes care ofmaintenance of the appliance
L34 FAN FAILURE PCU The fan is not running at the rightspeed
Bad connectionFan defective
4 Contact the professional who takes care ofmaintenance of the appliance
L35 BACK>BOIL FAIL PCU Flow and return reversed Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
Water circulation direction reversed
4 Check the circulation (direction, pump,valves)
L36 I-CURRENT FAIL PCU The flame went out more than 5times in 24 hours while the burnerwas operating
No ionization current
4 Check that the gas valve is fully opened4 Contact the professional who takes care of
maintenance of the applianceL37 SU COM.FAIL PCU Communication failure with the SU
PCBBad connection
4 Contact the professional who takes care ofmaintenance of the appliance
L38 PCU COM.FAIL PCU Communication failure between thePCU and SCU PCBs
Bad connectionSCU PCB not connected or faulty
4 Contact the professional who takes care ofmaintenance of the appliance
L39 BL OPEN FAIL PCU The BL inlet opened for a short time Bad connectionExternal causeParameter incorrectly set
4 Contact the professional who takes care ofmaintenance of the appliance
L40 TEST.HRU.FAIL PCU HRU/URC unit test error Bad connectionExternal causeParameter incorrectly set
4 Contact the professional who takes care ofmaintenance of the appliance
L250 DEF.WATER MIS. PCU The water pressure is too low Hydraulic circuit incorrectly ventedWater leakMeasurement error
4 Top up with more water if necessary4 Reset the boiler
L251 MANOMETRE FAIL PCU Fault on the water pressure sensor Wiring problemThe manometer is defectiveSensor pcb defective
4 Contact the professional who takes care ofmaintenance of the appliance
MCA 15 - MCA 25 MCA 25/28 MI 6. Troubleshooting
23/08/2011 - 300024159-001-B 36
Code Faults Causeof thefault
Description Checking / solution
D03D04
OUTL S.B FAIL.OUTL S.C FAIL.
SCU Circuit B flow sensor faultCircuit C flow sensor faultRemarks:The circuit pump is running.The 3-way valve motor on the circuitis no longer powered and can beadjusted manually.
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
D05 OUTSI.S.FAIL. SCU Outside temperature sensor faultRemarks:The boiler operates on BOILERMAX temperature.The valve setting is no longerensured but monitoring themaximum temperature of the circuitafter the valve is ensured.Valves may be manually operated.Reheating the domestic hot waterremains ensured.
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
D07 AUX.SENS.FAIL. SCU Auxiliary sensor fault Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
D09 DHW S.FAILURE SCU Domestic hot water sensor faultRemarks:Heating of domestic hot water is nolonger ensured.The load pump operates.The load temperature of the dhwtank is the same as the boiler.
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
D11D12D13
ROOM S.A FAIL.ROOM S.B FAIL.ROOM S.C FAIL.
SCU A room temperature sensor faultB room temperature sensor faultC room temperature sensor faultNote:The circuit concerned operateswithout any influence from the roomsensor.
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
D14 MC COM.FAIL SCU Communication failure between theSCU PCB and the boiler radiomodule
Bad connection
4 Check the link and the connectorsBoiler module failure
4 Change the boiler moduleD15 ST.TANK S.FAIL SCU Storage tank sensor fault
Note:The hot water storage tankreheating operation is no longerassured.
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
D16D16
SWIM.P.B. S.FAILSWIM.P.C. S.FAIL
SCU Swimming pool sensor fault circuitBSwimming pool sensor fault circuitCNote:Swimming pool reheating is alwaysdone during the circuit's comfortperiod.
Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
D17 DHW 2 S.FAIL SCU Sensor fault tank 2 Bad connectionSensor fault
4 Contact the professional who takes care ofmaintenance of the appliance
6. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI
37 23/08/2011 - 300024159-001-B
Code Faults Causeof thefault
Description Checking / solution
D27 PCU COM. FAIL SCU Communication failure between the SCU and PCU PCBs
4 Contact the professional who takes care of maintenance of the applianceD29 IOBL.3WV B DEF SCU Communication failure between the
SCU PCB and the V3V moduleThe V3V module is switched offThe V3V module and the SCU PCB are notconnected to the same live terminalThe V3V module has been removed
4 Contact the professional who takes care ofmaintenance of the appliance
D30 IOBL.3WV C DEF SCU Communication failure between theSCU PCB and the V3V module
The V3V module is switched offThe V3V module and the SCU PCB are notconnected to the same live terminalThe V3V module has been removed
4 Contact the professional who takes care ofmaintenance of the appliance
D31 COM.IOBL FAIL. SCU The IOBL function is no longeractive
Problem on the SCU PCB
4 Contact the professional who takes care ofmaintenance of the appliance
D32 5 RESET:ON/OFF SCU 5 resets done in less than an hour
4 Switch the boiler off and switch back on4 If the boiler does not start after several resets (5 attempts possible), contact your
heating engineer and inform him of the error message displayedD37 TA-S SHORT-CIR SCU The Titan Active System® is short-circuited
4 Contact the professional who takes care of maintenance of the applianceRemarks:Domestic hot water production has stopped but can nonetheless be restarted using keyr.The tank is no longer protected.If a tank without Titan Active System® is connected to the boiler,check that the TASsimulation connector (delivered with package AD212) is fitted to the sensor card.
D38 TA-S DISCONNEC SCU The Titan Active System® is on an open circuit
4 Contact the professional who takes care of maintenance of the applianceRemarks:Domestic hot water production has stopped but can nonetheless be restarted using keyr.The tank is no longer protected.If a tank without Titan Active System® is connected to the boiler,check that the TASsimulation connector (delivered with package AD212) is fitted to the sensor card.
MCA 15 - MCA 25 MCA 25/28 MI 6. Troubleshooting
23/08/2011 - 300024159-001-B 38
7 Technical specifications
7.1 Technical specifications
Boiler type MCA 15 MCA 25 MCA 25/28 MIGeneralFlow rate setting Adjustable Modulating, Start/Stop, 0 - 10 VNominal output (Pn)Heating System (80/60 °C)
minimum-maximum kW 3,0 - 14,5 5,0 - 24,1 5,0 - 24,1Factory setting kW 14,5 24,1 19,4
Nominal output (Pn)DHW System
minimum-maximum kW - - 5,0 - 28,6Factory setting kW - - 28,6
Data on the gases and combustion gasesGas consumption - Natural gas H (G20) minimum-maximum m3/h 0,33 - 1,59 0,55 - 2,65 0,55 - 2,96
Gas consumption - Propane G31 minimum-maximum m3/h 0,13 - 0,61 0,21 - 1,02 0,21 - 1,15
NOx-Emission per year (n =1) mg/kWh 33 38 38Characteristics of the heating circuitWater content l 1,7 1,7 1,7Water operating pressure (PMS) maximum kPa (bar) 300 (3,0) 300 (3,0) 300 (3,0)Water temperature maximum °C 110 110 110Operating temperature maximum °C 90 90 90Characteristics of the domestic hot water circuitSpecific hot water flow D (60 °C) l/min - - 8,2Specific hot water flow D (40 °C) l/min - - 13,7Flow rate threshold minimum l/min - - 1,2Operating pressure (Pmw) maximum kPa (bar) - - 800 (8,0)Electrical characteristicsPower supply voltage VAC 230 230 230
Power consumption - Full loadmaximum W 88 116 124Factory setting W 53 72 72
Electrical protection index IPX4D IPX4D IPX4DOther characteristicsTotal weight (empty) kg 43 43 44Acoustic level at 1 metre at high speed dBA 35 42 44
7. Technical specifications MCA 15 - MCA 25 MCA 25/28 MI
39 23/08/2011 - 300024159-001-B
8 Energy savings
8.1 Energy-saving advice
4 Keep the room in which the boiler is installed well ventilated.4 Do not block ventilation outlets.4 Do not cover the radiators. Do not hang curtains in front of the
radiators.4 Install reflective panels behind the radiators to prevent heat
losses.4 Insulate the pipes in rooms that are not heated (cellars and lofts).4 Close the radiators in rooms not in use.4 Do not run hot (or cold) water pointlessly.4 Install a water-saving shower head to save up to 40 % energy.4 Take showers rather than baths. A bath consumes twice as much
water and energy.
8.2 Recommendations
The remote control is available in the following versions:
4 Wire4 Radio
The setting of the control panel and/or of the remote control has aconsiderable influence on energy consumption.
A few tips:
4 In the room in which the room thermostat is installed, it's advisednot to use thermostatic valve radiators. If a thermostatic valve isused the valve must be fully opened.
4 Completely closing and opening thermostatic valve radiatorscauses undesirable temperature fluctuations. Open and closethermostatic valves in small steps.
4 Lower the temperature to around 20°C. This reduces heating costsand energy consumption.
4 Lower the temperature when you air the rooms.4 When setting a time schedule , bear days when you are absent
and holidays in mind.
MCA 15 - MCA 25 MCA 25/28 MI 8. Energy savings
23/08/2011 - 300024159-001-B 40
9 Warranty
9.1 General
You have just purchased one of our appliances and we thank you forthe trust you have placed in our products.
Please note that your appliance will provide good service for a longerperiod of time if it is regularly checked and maintained.
Your fitter and our customer support network are at your disposal atall times.
9.2 Warranty terms
The following provisions are not exclusive of the buyer being ablebenefit from the legal provisions applicable regarding hidden defectsin the buyer's country.
Starting from the purchase date shown on the original fitter's invoice,your appliance has a contractual guarantee against anymanufacturing defect.
The length of the guarantee is mentioned in the price catalogue.The manufacturer is not liable for any improper use of the applianceor failure to maintain or install the unit correctly (the user shall takecare to ensure that the system is installed by a qualified engineer).
In particular, the manufacturer shall not be held responsible for anydamage, loss or injury caused by installations which do not complywith the following:
4 applicable local laws and regulations,4 specific requirements relating to the installation, such as national
and/or local regulations,4 the manufacturer's instructions, in particular those relating to the
regular maintenance of the unit,4 the rules of the profession.
The warranty is limited to the exchange or repair of such parts as havebeen recognised to be faulty by our technical department and doesnot cover labour, travel and carriage costs.
The warranty shall not apply to the replacement or repair of partsdamaged by normal wear and tear, negligence, repairs by unqualifiedparties, faulty or insufficient monitoring and maintenance, faultypower supply or the use of unsuitable fuel.
Sub-assemblies such as motors, pumps, electric valves etc. areguaranteed only if they have never been dismantled.
The legislation laid down by european directive 99/44/EEC,transposed by legislative decree No. 24 of 2 February 2002 publishedin O.J. No. 57 of 8 March 2002, continues to apply.
9. Warranty MCA 15 - MCA 25 MCA 25/28 MI
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© CopyrightAll technical and technological information contained in these technical instructions,as well as any drawings and technical descriptions supplied, remain our propertyand shall not be multiplied without our prior consent in writing.
23/08/2011
DE DIETRICH THERMIQUE
57, rue de la Gare F- 67580 MERTZWILLER - BP 30