INSTALLATION
GUIDE
Ref. : 1871184 - 0107103
ASCARI MA12
ELECTRIC HEATING BOILER
Ascari MA12 -p. 1 -
CONTENTS
1
- Installation ans configuration .................................................................................... p. 03
1.1 - Quick reference guide ................................................................................................................ p. 03
1.2 - Install options ............................................................................................................................. p. 04
1.3 - Boiler (serial numbers of 0500151 and over) ............................................................................. p. 05
1.4 - Menu options ............................................................................................................................. p. 06
1.5 - Summer / Winter mode ............................................................................................................. p. 07
1.6 - Underfloor heating ..................................................................................................................... p. 07
2
- Installation and Devicing instructions ....................................................................... p. 08
2.1 - Introduction ................................................................................................................................ p. 08
2.2 - Important information ................................................................................................................. p. 09
2.3 - Technical specification ............................................................................................................... p. 10
2.4 - Preparation ................................................................................................................................ p. 11
2.4.1 - Opening case ................................................................................................................ p. 11
2.4.2 - Electrical compartment ................................................................................................. p. 12
2.4.3 - Selecting thermal cut-out .............................................................................................. p. 12
2.5 - Installation requirements ............................................................................................................ p. 13
2.5.1 - Location ......................................................................................................................... p. 13
2.6 - Installation .................................................................................................................................. p. 13
2.6.1 - Main Unit ....................................................................................................................... p. 13
2.6.2 - Plumbing ....................................................................................................................... p. 14
2.6.2.1 - Radiators/Underfloor ...................................................................................... p. 14
2.6.3 - Filling loop ..................................................................................................................... p. 15
2.7 - Electrical .................................................................................................................................... p. 16
2.7.1 - Power selection ............................................................................................................. p. 17
2.8 - Commissioning and testing ........................................................................................................ p. 17
2.9 - Boiler configuration .................................................................................................................... p. 18
2.9.1 - Automatic / Manual operation ....................................................................................... p. 19
2.10 - Pump speed ............................................................................................................................. p. 19
2.11 - Troubleshooting ........................................................................................................................ p. 19
2.12 - Servicing .................................................................................................................................. p. 19
2.13 - Dimensions - hydraulic connections ........................................................................................ p. 20
2.14 - Power terminal ......................................................................................................................... p. 21
2.15 - Connection to the electricity .................................................................................................... p. 22
2.16 - Regulation circuit drawing ........................................................................................................ p. 23
2.16.1 - Operating from a switched live .................................................................................... p. 23
2.16.2 - Direct room thermostat connections and direct cylinder thermostat ........................... p. 24
2.17 - Control accessories wiring ....................................................................................................... p. 25
2.17.1 - Operating from a switched live .................................................................................... p. 25
2.17.2 - Direct room thermostat connections and direct cylinder thermostat ........................... p. 26
2.18 - Wiring diagrams ....................................................................................................................... p. 27
2.19 - 3 Speed water pump ................................................................................................................ p. 29
2.20 - Control pannel description ....................................................................................................... p. 30
2.21 - Regulation settings .................................................................................................................. p. 31
2.22 - Operating ................................................................................................................................. p. 33
2.22.1 - Automatic / Manual operation ..................................................................................... p. 33
2.22.2 - Requested heating temperature setting in manual mode ............................................ p. 33
2.22.3 - Summer / Winter shift ................................................................................................. p. 33
2.22.4 - Programming the maximum output setting of the boiler ............................................. p. 34
2.22.5 - Temperatures display .................................................................................................. p. 34
2.23 - Counters .................................................................................................................................. p. 35
2.24 - Failures display ........................................................................................................................ p. 35
2.25 - Maintenance ............................................................................................................................ p. 36
2.26 - Troubleshooting ....................................................................................................................... p. 36
Ascari MA12 -p. 2 -
1 - INSTALLATION & CONFIGURATION
1.1 - Quick reference Guide
1. It is recommended that the boiler be connected to a 10hour or similar off-peak tariff that provides some
daytime off-peak hours.
2. Where the off-peak tariff is restricted a changeover relay should be used to switch power to the boiler
when the off-peak supply is not available.
3. Fill the system with water prior to turning on the electrical supply to the boiler.
4. Ensure the system is flushed thoroughly before letting any air/water exit through the pressure relief valve
(dirt can prevent the valve closing).
5. Check the system is full by turning the pressure relief valve cap, and check water exits correctly through
the discharge pipe.
6. A manual pressure gauge should be used to check the system pressure when cold. The pressure should
be set between 1 bar & 1.5bar. Note all air should be removed from the system before measuring the
system pressure.
6a Alternative with the electric supply off, the yellow bridge between terminals 10 and 11 may be removed
before filling the system for the final time ( this prevents the elements turning on) and the boiler pressure
gauge used to set the cold system pressure. Once set to 1-1.5bar, the boiler should be switched off and
the yellow bridge returned to its position between terminals 10 & 11.
Ascari MA12 -p. 3 -
1.2 - Install Options
1. SPACE HEATING ONLY (recommended)-direct room thermostat Connection
• The no-volt contacts of the room thermostat should be connected to terminals 1 and 2 of the boiler.
• Menu option 4 should be set to 01 to allow the boiler to be controlled from the room thermostat.
2.
OPERATING WITH HOT WATER CYLINDER
Dimplex recommend to use a direct electric unvented cylinder for the production and storage of the hot water
as this is cheaper than an indirect cylinder, requires less plumbing (piping and valves) and is more thermally
efficient.
Installation Configuration –Heating & Hot Water
Hot water
outlet
Room
thermostat
Air bleeders
W-Plan
10 way connector
4 bar
0 bar
Differential
Pressure
Valve
3-port diverter valve
Cylinder
thermostat
Two-port
valve
Two-port valve
-
Un
d
He er F
at lo
in o r
g
3bar pressure
relief valve
manifold
or
+
Man
Auto
3-speed pump
Switched Live
8 litre Expansion vessel
When using the boiler for unvented hot water and heating, the two-port motorised valve should be inserted in
the flow from the boiler. A Differential Pressure valve should then be connected between the flow and return at
a point between the boiler and the two-port motorised valve.
Ascari MA12 -p. 4 -
1.3 - Boiler (serial numbers of 0500151 and over)
Two options are available:
Option 1 - Operating from a Switched Live
Switched Live
1. The switched live from the 10-way connector block should be connected to terminal 25, which is located
beside the relay located in top right of the boiler.
2. In the set-up menu, set option 04 to 1
3. Auto-adaptability (option 6 of the set-up menu) should be turned off.
4. The minimum central heating circuit temperature (option 3 of the set-up menu) should be selected to
provide central heating and hot water safely.
5. The boiler should be set to operate in winter mode (press and hold the radiator key until the snowflake
indicator illuminates).
6. All other options in the set-up menu should be set to the Menu options listed below.
Option 2 – Direct Cylinder Thermostat & Room thermostat connections
• The brown wires should be removed from terminals 1 and 2 and be placed into terminals 5 and 6
respectively.
• The room thermostat no-volt Normally Open contacts of the room thermostat should be connected
between terminals 1 and 2 of the boiler. In the set-up menu, set option 04 to 1.
• The cylinder thermostat normally open contact (240V) should be connected to terminal 25, wich is
located beside the relay located in top right of the boiler.
• In the set-up menu, set option 12 to 01
set option 13 to 00
Ascari MA12 -p. 5 -
1.4 - Menu Options
The set-up menu should be configured as follows, some of these parameters will be modified by instructions in
the previous sections.
Option
Setting
01
1
mandatory
02
80oC
or as required 21-80oC
03
30oC
or as required 21oC- maximum temperature set
04
1
if operating from a switched live or if a room thermostat
installed 0 if not
05
1
if option 4 set to 1
06
1
recommended (unless instructed otherwise)
07
0
mandatory
11
1
min or user defined 1-6minutes delay in switching
elements.
12
1
0
if boiler connected to indirect hot water cylinder
if boiler used for heating only.
13
0
mandatory.
15
1
for 12kw boiler operation
for reduced maximum output power see § 2.7.1
Notes: In normal operation press the + button to check if the room thermostat is calling for heat once, a 1 indicates a call for heat. Press
the + button a second time and if auto-adaptability has been selected the temperature correction applied will be displayed (Option
06 Auto-adaptability adjusts the temperature of the heating circuit for the most efficient and temperature stable operation. )
Ascari MA12 -p. 6 -
1.5 - Summer / Winter Mode
The right-hand snow flake symbol should be illuminated indicating winter mode. If the sunshine symbol is
illuminated, select winter mode by pressure and holding the radiator button on the boiler for 3 seconds. In
Summer mode the heating circuit is switched off but hot water, if installed will be still be heated.
1.6 - Underfloor Heating
• For underfloor heating the 60oC internal temperature cut-out should be selected.
• Where underfloor and hot water cylinder are used in the same heating circuit it is necessary to use the
100oC Temperature cut-out in the boiler and include a separate 60oC thermal cut-out for the underfloor
heating circuit.
Ascari MA12 -p. 7 -
Ascari MA12 -p. 8 -
2 - INSTALLATION & DEVICING INSTRUCTIONS
Features
• Selectable Water Temperature
- radiators/ Underfloor (21-80oC)
• 60oC or 100oC thermal cut-out suitable for underfloor heating or radiators
• Room Thermostat operation
• Frost Protection, 5oC minimum temperature
• Pump protection - once a day operation when system is off
• Pump overrun facility
• 4-stage stepped turn on/off
• Weekly alternative switch start-up for prolonged life
• Automatic water temperature variation for 50% on-off cycles (with room thermostat)
• Switch operation counter – monitors switch usage
• System pressure display
Water Heating
It is recommended that the boiler be used for central heating purposes only and hot water be stored and heated
by a direct electric hot water cylinder. This allows hot water to be heated over night on an off-peak tariff and
reduces heat losses between the boiler and the cylinder.
2.1 - Introduction
The Dimplex Ascari boiler is an all electric domestic central heating boiler suitable for use on a 230V 52A 50Hz
supply. The unit is easy to install and requires no flue, making it ideal for apartments or properties in conservation
areas.
The unit is supplied ready for operation as a 12KW 230V single phase boiler and will automatically modulate
down to 10, 8 and 6KW. The maximum output power may also be manually limited to operation at maximum
power levels of 10, 8 , 6 or 4 kW upon which the boiler will proportionally modulate to lower power levels.
Finished in a clean white case and with dimensions of 620mm height x 405mm width, the boiler is suitable for
installation in a kitchen area. With thermal cut out selectable at 60oC or 100oC the boiler is suitable for standard
wet radiator systems or underfloor heating.
There are no ventilation requirements associated with the operation of this boiler, however to maintain a dry
atmosphere a well ventilated room is recommended.
Ascari MA12 -p. 9 -
2.2 - Important Information
• The information given in this booklet is a guide only. All installations must follow the current
regulations for this type of device and where no information or conflicting information is given in
this guide to that of the current regulations, the current regulations will apply.
• Disconnect the Electricity Supply before attempting to remove the cover of the boiler.
• The boiler weighs 38kg and requires two persons to lift and install the product. Please ensure all
mounting fixings and the wall onto which it is to be installed are sufficiently strong to take the
weight of the unit plus its water contents.
• The heating system must be installed by a competent person and to current regulations in force at
the time.
• All wiring should conform to the regulations in force at the time. The appliance is approved to a
protection rating of IPX1. Therefore if the appliance is to be installed in a room containing a bath
or a shower, any electrical switch or control utilising mains electricity must be so situated that it
cannot be touched by a person using the bath or shower. Attention is drawn to the requirements
of the current BS 7671 (I.E.E Wiring Regulations) and in Scotland the electrical provisions of the
Building Regulations applicable in Scotland.
• Complete all plumbing work before connecting the boiler to the electricity supply.
• This appliance must be earthed!
• The boiler should be permanently connected to the electricity supply, direct from a 63A fused
supply on the consumer unit via a double pole linked switch with minimum contact gap of 3mm.
No other appliances should be powered from this supply.
• The expansion vessel is pre-charged to 1 bar (0.1MPa). During the installation process and
before operating the boiler this should be checked using a suitable pressure gauge.
• A 3 bar (0.3MPa) pressure relief device is incorporated within the product, the cold system pressure
should not exceed 1.5bar (0.15MPa).
• When using with radiators fitted with TRV controls the heating system must have a bypass radiator
fitted capable of circulating water at 350litres/hour.
• The system should be flushed prior to connecting the boiler to remove all particles from the
pipework. Do not use the fitted pressure relief valve to flush the system as particles trapped in the
valve will cause incorrect valve operation.
• The outlet of the pressure relief valve should be left open to the atmosphere, any connection to
the outlet pipe must be of a minimum diameter of 15mm, should fall continuously and should
terminate so that water/steam may visibly and safely discharge. Should any water or steam be
seen to be exiting from this outlet the boiler electricity supply should be switched off and the
Dimplex customer service centre contacted.
Ascari MA12 -p. 10 -
• A drain cock should be installed at the lowest point in the heating system to allow the water in the
heating system to be drained as fully as possible.
• While the boiler and heating system may be filled from the cold mains water supply, the boiler
must be isolated from the cold mains water supply by a suitable break in the supply pipe during
normal operation.
• Filling Loop- this boiler is not fitted with a filling loop. Any filling loop being fitted should comply
with the water supply (water fittings) regulations 1999 Section G24.1 and G24.2. A filling loop
should be fitted at some point to allow the CH system to be filled.
• The boiler must be installed in an upright position away from nearby objects (see installation
section for clearances) in a clean, dry, frost free place.
2.3 - Technical Specification
ELECTRICAL
Supply
12Kw@ 230V 52A 50Hz
13Kw@ 240V 52A 50Hz
Maximum Power Output
12KW manually convertible to 10, 8, 6 or 4KW
Modulation
Automatic three or four stage reduction in 2KW
steps
12kW - 10-8-6
10kW - 8-6-4
8kw - 6-4-2
6kw - 4-2
Fuse requirements
63Amp
Number and cross-section
3 x 16² (Phase + Neutral + Earth)
PERFORMANCE
Water Pressure
Minimum
Maximum
Nominal
Water
Temperature
Minimum
Maximum
0.5Bar (0.05MPa)
2.5 Bar (0.25MPa)
2 Bar (0.2MPa)
21oC
80oC
Water Flow Rate
Minimum
Nominal
Maximum
350litres/hour
700litres/hour
1400litres/hour
Thermal Limit
100oC
60oC
Radiators
Underfloor
Ascari MA12 -p. 11 -
MECHANICAL
Weight
38kg
Dimensions
620mm h x 405mm w x 280 d
Rating
IPX1
Storage capacity
5 litres
Connections
1"( 26/34) female
Heat Exchanger
Cast Iron
Elements
2 heaters comprising 3 x 2kw incoloy elements
Expansion Vessel
8 litres
Pump
3-speed manually selectable
Thermal cut-outs
2 units manually selectable 60oC or 100oC
2.4 - Preparation
2.4.1 - Opening Case
The boiler may be opened by unscrewing the bottom two bolts a couple of turns (they do not need to be
removed completely). The front cover may then be pulled out from the bottom and lifted off the two top pins.
Switch off the electricity
supply to the boiler before
opening the internal cover.
Ascari MA12 -p. 12 -
2.4.2 - Electrical Compartment
With the cover removed access to the electrical connections is achieved by undoing the screw of the electric
box. Once opened access is gained to the electrical connectors, for easy installation.
2.4.3 - Selecting Thermal cut-out
The thermal cut-outs are situated at the top of the boiler and may be selected during the installation by rerouting the electrical connections. The boiler is factory set with the 100oC cut-out selected for use with radiator
heating systems. If the Boiler is to be used with underfloor heating remove the connectors from the 100oC
sensor and connect to the 60oC sensor ensuring there is a good connection.
Connector
60°C
100°C
Thermal cut-out selection
(100deg C for radiators, 60deg C for underfloor)
Where both underfloor and hot water cylinder are used, it is necessary to use the 100°C temperature cut-out in
the boiler and include a separate 60°C thermal cut-out for the underfloor heating circuit.
Ascari MA12 -p. 13 -
2.5 - Installation Requirements
2.5.1 - Location
• The boiler must be located at least 300mm above any object
to allow the elements to be removed. At least 100mm is
required at the top of the boiler to allow for connection of
pipework.
• 10mm is required at the sides of the unit.
•
100
10
10
The boiler must be mounted on an internal solid masonry
wall capable of withstanding the weight of the product when
full of water.
• Consideration should be given to the routing of electric cables
300
to the product and the wiring to a thermostat (if used).
• The location must be free from frost and excessive moisture.
2.6 - Installation
2.6.1 - Main Unit
300
Ø8 screw plug
• Once marked out, drill 8mm diameter holes and plug
with masonry plugs. Screw in high strength screws
to a depth that allows the inner face of the screw
head to protrude from the wall a distance to allow
the mounting plates at the rear of the boiler to
engage (approx 5mm).
•
Overall frame
pattern
With suitable equipment or an assistant raise the
boiler to the fixing point and ensure each screw has
engaged into the mounting slots. Tighten the screws
to secure the boiler to the wall.
• Once fixed to the wall the boiler may be plumbed
into the central heating system.
Ø8 screw plug
Ascari MA12 -p. 14 -
605
mark the hole positions as per figure 6.1 below. Use
a spirit-level to ensure the holes are aligned
correctly. Access to the bottom screw hole is
achieved by removing the bottom element plate.
29
• Once the location of the boiler has been selected,
2.6.2 - Plumbing
2.6.2.1 - Radiators / Underfloor
Room
thermostat
Air bleeders
Service
valves
Radiators
OR
Pump
Under Floor safety limiter
if used with hot water cylinder
Expansion
Relief
Valve
Drain
tap
Expansion
vessel
Underfloor heating
• Install the heating system bringing the flow and returns to the boiler location.
• The system should be flushed prior to connecting the boiler to remove all particles from the pipework. Do
not use the fitted pressure relief valve to flush the system as particles trapped in the valve will cause
incorrect valve operation.
• At least one air bleeding device should also be connected to the highest point of the plumbing system to
remove trapped air and ensure silent running of the heating system.
• If using radiators with Thermostatic Radiator Valves a bypass radiator must be fitted with lockshield
valves that will allow a flow of 350 litres/ hour.
• Service valves should be connected to the inlet and outlet of the boiler for easy maintenance.
• Although the boiler can operate without a room thermostat this is required for automatic adjustment of
boiler output temperature.
• Where underfloor heating is being used without hot water cylinder, the 60oC thermal cut-out must
connected in place of the factory selected 100oC device– see section 4.3.
• A drain cock is required to be fitted in the lowest part of the heating system to allow the system fluid to be
drained fully.
Ascari MA12 -p. 15 -
• A filling loop must be installed that isolates from the cold mains water supply from the heating system and
complies with the current building and water regulations in force at the time.
• The boiler incorporates an 8-litre expansion vessel which is suitable for heating systems as follows:
Initial System Pressure (bar)
Total Water in heating system (litres)
For larger systems
Multiply the volume of water
by these factors
0,50
0,75
1,00
1,50
96
84
73
50
0,0833
0,0930
0,1090
0,1560
2.6.3 - Filling Loop
This boiler is not fitted with a filling loop. Any filling loop being fitted should comply with the water supply (water
fittings) regulations 1999 Section G24.1 and G24.2. A filling loop should be fitted at some point to allow the CH
system to be filled.
Two types are shown below:
METHOD B
METHOD A
F
Temporary Flexible Hose
Connection
To be removed
immediately after filling
Cistern &
Overflow
F
Stop
valve
Stop
valve
Mains
water
supply
Double
check
valve
assembly
Stop
valve
Mains
water
supply
Heating
System
Return
Pressure Pump &
reducing valve
(if required)
Heating
System
Return
Recommended and approved method for filling closed circuits in a house (R24-2a Water Regulations Guide)
Ascari MA12 -p. 16 -
2.7 - Electrical
• Wiring external to the appliance must be in accordance with the current I.E.E Wiring regulations (BS 7671)
for electrical installation and any local regulations, which apply.
• With the boiler plumbed in, the electrical connections can be made
to the boiler:
• This appliance must be earthed!
• The Ascari boiler comes with cage-clamp connectors. These are operated using a 2.5mm x 0.4mm blade
screwdriver for accessory terminals and 3.5mm x 0.5mm blade screwdriver for power terminals.
• The boiler should be permanently connected to the electricity supply, direct from a 63A fused supply on the
consumer unit via a double pole linked switch with minimum contact gap of 3mm. No other appliances
should be powered from this supply.
• The number and cross-section of connector is mandatory 3 x 16² (phase + neutral + earth) (see § 2.15
«connection to the electricity supply»)
•
To connect a wire, insert the blade of the screwdriver into the opening located just above or below the
central mark of the terminal block and pivot the blade towards the centre. The wire may then be inserted
into the cage and the screwdriver blade removed (see § 2.14 «Power terminal»).
• ROOM THERMOSTAT - The no voltage connections of a room thermostat may be connected to terminals
1 (common contact) and 2 (Normally Open contact) of the boiler (please check compatibility with thermostat
manufacturers installation instructions), routing the cable through the smaller cable entry points. If using a
non-programmable room thermostat it is recommended that the no-voltage switched contacts of a separate
timer / programmer be connect in series with the room thermostat to terminal 2 of the boiler. WARNING- a
switched live must not be connected to the boiler terminals.
•
If used the cylinder thermostat normally open contact (240V) should be connected to terminal 25 of the
boiler’s electrical connectors ( see section Boiler electrical connections)
• The power supply cable (3x16²) should be routed through the large cable entry point at the bottom of the
boiler. If desired the cable entry may be moved to the top of the boiler by removing the self sealing nut from
the bottom to the top entry point.
• The Earth wire should be connected to the top terminal marked with the Earth symbol.
• The Neutral wire should be connected to the large terminal marked ‘N’.
• The live wire to the large terminal labelled PH.
• Do not switch on the electricity supply until asked to do so in the Commissioning and Testing section.
•
As a minimum it is recommended that a room thermostat be installed to control the appliance. Thermostatic
radiator valves may be fitted to the system, however they must not be fitted in the room where the room
thermostat is fitted. There must be at least one radiator installed with lock shield valves that should not be
closed and will allow 350litre/hr circulation. Further guidance can be obtained from the Domestic Heating
and Hot Water Guide to the building regulations.
Ascari MA12 -p. 17 -
2.7.1 Power selection
The boiler is supplied as a 12Kw modulating boiler but can be reduced to 10, 8, 6 or 4kw by disconnecting
individual elements.
R Bl W
B B B
R Bl W
R Bl W
B B B
B
B
12 kW
R Bl W
B B B
10 kW*
ex-work
R Bl W
B
B
R Bl W
R Bl W
B
B
B
8 kW*
R Bl W
B
R Bl W
B
B
6 kW*
R Bl W
R
Bl
W
B
B
4 kW*
:
:
:
:
Red
Black
White
Blue
View from bellow
* Remove blue connectors between power terminal and elements
according to drawing.
2.8 - Commissioning & Testing
Water Treatment, Cleansing and Flushing the Heating System
NOTE: British Standard BS7593: 1992 stresses the importance of cleansing and flushing of the system to
ensure it continues to run efficiently with the minimum of maintenance necessary. Halstead Boilers fully support
this professional approach and recommend that the system is cleansed with an effective chemical cleanser and
protected long term with a suitable inhibitor. Such products are available from Fernox and Sentinal.
• Check the pressure of the expansion vessel, this should be factory set to 1bar (0.1MPa).
• The heating system should be filled using the approved installed filling loop. Ensure all radiator valves are
open. The initial system pressure when cold should be between 1.0 (0.lMPa) and 1.5bar (0.15MPa).
• Once filled check the system for leaks.
• Open the drain cock and drain the system fully.
Ascari MA12 -p. 18 -
•
Refill the system from the filling loop, to a pressure between 1-1.5bar (0.1-0.15MPa) and operate the
pressure relief valve manually to check that water runs away correctly, and that the valve closes correctly.
• Top up the system to 1.0bar (0.1MPa).
• Disconnect the system from the filling loop.
• Check the electric connections and that all covers etc. have been replaced. Turn on the electricity supply to
the boiler and allow the unit to do its self diagnosis. Refer to § 2.24 if a fault is displayed.
• Use ethylene glycol only with incorporated corrosion inhibitor. Glycol ratia must be under 10%.
2.9 - Boiler Configuration
Once the boiler has initialised the feature options can be selected (see quick reference guide for options):
Press – and + together for 3 seconds to enter the selection menu. With reference to § 2.21 the top display
should show a flashing 01. Use the +/- keys to select the parameter to be changed and the tap or radiator keys
to change the setting of any selected parameter:
01
This setting should always be set to 1.
02
Select the maximum temperature of the water circulating in the heating circuit.
03
Select the minimum temperature of the water circulating in the heating circuit.
04
Select 1 if oprating from a switched live or if of room thermostat is installed and connected to
the boiler.
05
If 04 has been set to 1 this setting should also be set to 1.
06
If 04 has been set to 1 the boiler can automatically adjust the water temperature in the heating
circuit according to actual heat-up times of the property, overriding the minimum and maximum
water temperature settings. If this facility is required select 1, otherwise set 0.
07
This option should be set to 0.
08
n/a
09
n/a
10
n/a
11
The boiler can delay the switching on and off of the elements to provide a smooth power onoff gradient and the number of on-off cycles in a short period. The delay between switches
operating can be set from 1 to 6 minutes. (default is 2 min)
12
Select 0 for central heating or floor heating only. (default is 0)
Select 1 if boiler connected to indirect hot water cylinder.
13
This setting should always be set to 0.
14
n/a
Press + & - together for 3 seconds to exit the set-up menu.
Ascari MA12 -p. 19 -
2.9.1 Automatic/ Manual Operation
The boiler must be set to Manual operation as follows:
Press and hold the Auto/Man button for 3 seconds. The display will show Au or Man, press the Auto/Man button
again for a short period to toggle the display so that it shows Man. With the correct display showing, press and
hold Auto/Man for 3 seconds to return to normal operating mode.
2.10 - Pump Speed
The boiler is factory set at pump speed 3, for lower pump speeds the selector in the centre of the pump may be
turned to 1 or 2 using a large flat bladed screwdriver.
2.11 - Troubleshooting
The boiler has many selectable options. Please ensure the correct selections are made for the type of installation
you have made. If you have selected the use of a room thermostat, or hot water cylinder, the boiler will not
operate until these devices are connected.
• The boiler indicates a boiler fault by flashing all segments of the temperature display.
Please call the Dimplex Customer Service department – see Servicing
•
section.
2 FLASHING SEGMENTS in front of bar – indicate the system pressure has fallen below the minimum
operating pressure.
• check if water has discharged from the pressure relief valve. If so call a Dimplex service agent.
• check for leakage in the system.
Once the fault has been cleared the boiler will turn on again if the system is filled and pressurised to over 0.5
bar.
2.12 - Servicing
It is recommended that the Boiler be installed and serviced regularly by a Dimplex service agent to ensure
continual trouble-free operation. For details of service agents in your area please contact:
Glen Dimplex UK Limited
Millbrook House
Grange Drive
Hedge End
Hampshire
SO30 2DF
Dimplex Customer Services on 0870 727 0101
Ascari MA12 -p. 20 -
2.13 - Dimensions - Hydraulic connections
Decoding
1
2
3
4
6
7
8
9
11
-
Bottom view
(Trapdoor to access elements removed)
3 speed pump
8 liters expansion vessel
3 bar safety relief bleeder
La ck of water sensor
60°C safety limitator
100°C safety limitator
Boiler's sensor
Control pannel
Fuse
Elements
fastener
Heating elements
Drain tap
Front view
Side view
87,5
405
7
6
8
1
29
300
4
3
619
2
9
11
Power wire entry
Accessories
connection entries
Safety relief drain
Ø15
Top view
D = Heating outflow 1" female nut (26/34)
R = Heating backflow 1" female nut (26/34)
Ascari MA12 -p. 21 -
259
280
81
R
D
2.14 - Power terminal
Put the self-sealing nut (supplied with the boiler) for
connection to mains from the bottom of the casing.
Put the self-sealing nut (supplied with the boiler) for
connection to mains from the top of the casing. In
this case remove the plastic cap and close the hole
below casing using same.
or
Screw A
Plastic cap moved from top
to bottom
5 self-sealing nuts for accessories connections
(Ambience thermostat, outside and/or Domestic Hot
Water sensor and remote cut-out)
Connections are cage-clamp terminals, to be used as to follow :
- For accessories terminals use a 2,5 x 0,4mm blade screwdriver
- For power terminal use a 3,5 x 0,5mm or 5,5 x 0,8mm blade
screwdriver.
1 : Introduce the blade of the driver into the opening located just
above or bellow the mark with a slight pivoting move to center.
2 : Introduce the connector's terminal inside the cage.
3 : Remove the screwdriver
Ascari MA12 -p. 22 -
2.15 - Connection to the electricity supply
Ground 16²
I: 63A fused supply on the consumer unit
Neutral 16²
via a double pole limited switch with
minimum contact gap of 3mm.
Phase 16²
I
NOTE : Stripped length of wires between 16 and 17mm
Ascari MA12 -p. 23 -
2.16 - Regulation circuit drawing
2.16.1 - Operating from a switched live
Decoding :
L1
: Live
N
: Neutral
F
: 4A fuse size 5 x 20
K1 to K4
:
20A power breakers
C1
: Electronic card with display
DT
:
Total cut-out (remove the bridge)
CC
: 3 speed pump
DP1 & DP2 :
Partial cut-out (remove the
SC
: Boiler's sensor
AQS1
: 60°C safety limitator with manual reset
AQS2
:
100°C safety limitator with
manual reset
bridge)
R
Ascari MA12 -p. 24 -
:
External command relay
2.16.2 - Direct room thermostat connections
and direct cylinder thermostat
L1
N
F
C1
CC
SC
AQS1
AQS2
K1 to K4
:
:
:
:
:
:
:
Decoding :
DT
Live
Neutral
4A fuse size 5 x 20
Electronic card with display
3 speed pump
Boiler's sensor
60°C safety limitator with
manual reset
: 100°C safety limitator with
manual reset
: 20A power breakers
: Total cut-out (remove the
bridge)
DP1 & DP2
: Partial cut-out (remove the
bridge)
R
: External command relay
Room thermostat
: Direct room thermostat novolt normally open contacts
Cylinder thermostat : External command from
direct cylinder thermostat
(normally open contact
240V)
Ascari MA12 -p. 25 -
2.17 - Control accessories wiring
2.17.1 - Operating from a switched live
1-2
:
External command relay contact
3-4
:
n/a
5-6
:
n/a
10 - 11
:
Total cut-out DT (remove the bridge) and / or 65°C
heating floor safety limitator (mandatory) with
manual reset.
See § 1.3.1.
12 - 13
:
Partial cut-out DP1 (remove the bridge)
14 - 15
:
Partial cut-out DP2 (remove the bridge)
25
:
External command of switched live (use phase 230V
common to the boiler on pin L1)
• Connectors will be of electrolitic quality brass (no corrosion of stripped ends at connection).
• Never use telephone wire (cross-section of sub-connectors too thin and easy breakable at
connections points).
• Cross-section of connectors must be between 0,5 and 1mm².
Ascari MA12 -p. 26 -
2.17.2 - Direct room thermostat connections
and direct cylinder thermostat
1-2
:
Direct room thermostat connections
3-4
:
n/a
5-6
:
The brown wires should be removed from terminals
1 and 2 and be placed into terminals 5 ans 6
respectively
10 - 11
:
Total cut-out DT (remove the bridge) and / or 65°C
heating floor safety limitator (mandatory) with
manual reset.
See § 1.3.1.
12 - 13
:
Partial cut-out DP1 (remove the bridge)
14 - 15
:
Partial cut-out DP2 (remove the bridge)
25
:
External command from direct cylinder thermostat
(use phase 230V common to the boiler on pin L1)
• Connectors will be of electrolitic quality brass (no corrosion of stripped ends at connection).
• Never use telephone wire (cross-section of sub-connectors too thin and easy breakable at
connections points).
• Cross-section of connectors must be between 0,5 and 1mm².
Ascari MA12 -p. 27 -
2.18 - Wiring diagrams
3
OUT 4
pink
pink
grey
grey
yellow
GND
OUT
pressure sensor connect.
black
red
yellow
white
+Vdc
230 V / 12 V
adaptator
Outside sensor (S.Ext)
DHW sensor
white
SC
white boiler's sensor (SC)
brown
ambience thermostat (TA)
brown
orange
black
red
red
black
white
230V power
+Vdc 2
white pres
sure sen
sor powe
grey
r
DHW pump C.ECS
Heating pump CC
GND 1
6
5
4
3
2
1
blue
F
brown
brown
external command relay contact
blue
blue
(1)
: In optionnal
PH :
Phase
N
:
Neutral
F
:
4A fuse size 5 x 20
C1 :
AQS 1 AQS 2
60°C 100°C
T
N N
black
black
red
red
white
9 101112131415 PHPH PH PH PH N N
white
green
yellow
1 2 3 45 6 78
blue
brown
CC
blue
blue
T
Légende :
CC
blue
:
3-speed pump
DHW sensor
:
Domestic Hot Water Safety limitor
SC
:
Boiler's sensor
Electronic card with display
Ascari MA12 -p. 28 -
black
red
L1
External
command
L1
L2
A2
A1
L3 L4
black
white
L1
L2
T3 T4
A1
T4
A2
L3
red
L4
A1
T2
T1
T3
T4
A2
blue
black
T1
balck
red
A2
red
T2
T3
K3
blue
T1
T2
T1
white
T4
blue
L2
T3
white
L1
T2
L4
L3
K4
K1
blue
black
A1
red
R 25
a2
balck
a1
red
brown
brown
12
14
11
L4
K2
T1
red
L3
L2
T2
bleu
bleu
Légende :
AQS1
:
60°C Safety limitor with manual reset
K1 to K4 :
20A power breakers
AQS2
:
100°C safety limitor with manual reset
T1 & T2 :
6kW heating elements
Ascari MA12 -p. 29 -
blue
live
white
white
red
black
white
yellow
yellow
white
2.19 - 3 Speed water pump
III
II
I
3 speed (I, II et III) water pump for adjustment to operating needs, depending on insulation and circuit
The boiler is factory set at pump speed 3, for lower pump speeds the selector in the centre of the pump may
be turned to 1 or 2 using a large flat bladed screwdriver.
Electric datas
Speed
Nominal
output (W)
Nominal
intensity (A)
III
90
0,40
II
67
0,30
I
47
0,20
Ascari MA12 -p. 30 -
2.20 - Control pannel description
Usual operating functions
Boiler's temperature display in °C.
When the boiler is off and the two
middle horizontal LEDs on, antifrost
protection is operating.
(flashing in case of sensor failure)
(Glittering • displays normal
operating)
Summer mode green LED
Winter mode green LED
°C
Used
to
decrease
temperature during settings
(instant touch) or cancel
(press 3 sec)
Used
to
increase
temperature during settings
(instant touch)
Operating display red LED
bar
Hot Water selection (n/a) or
start the spring mode DHW
(press 3 sec.)
On/Off
switch
(with
automatic
anti
frost
protection for DHW and
heating circuits) (instant
touch)
Auto
Manu
Pressure display in bar.
Boiler stops automatically below 0,3 bar
with automatic reset over 0,5 bar.
(0,2 blinking displays a pressure loss other value flashing displays a
pressure sensor failure)
Ascari MA12 -p. 31 -
Used to enter requested
heating temperature menu
(instant touch) or start the
winter mode (heating and
DHW) (press 3 sec.)
Must be set to manual
Used to choice manual or
automatic operating (see
§2.9.1)
2.21 - Regulation settings
For fitter's use only.
The regulation must be adjusted according the use of the boiler.
• Press
and
• Parameter #
• Press
or
(3 sec) to start setting menu for 4 minutes.
starts blinking in front of "°C"
(instant touch) to select next parameter, i.e
• To start setting the displayed parameter press
• The parameter value, i.e
or
°C, ... until
(instant touch).
starts blinking in front of "bar".
• Press
or
(instant touch) to change setting.
• Press
or
(instant touch) to confirm setting and return to setting menu.
• Press
and
(3 sec) any time to exit the setting menu.
Ascari MA12 -p. 32 -
°C
PARAMETERS LISTING
Press
and
during 3 sec to access parameters menu.
Available if Paremeter #
Description
Electric boiler (no = O ; yes = 1)
Setting range
Ex-word settings
0 or 1
1 mandatory
(1)
Maximum requested boiler's temperature
(TCMA)
21 to 80°C
75°C
(1)
Minimum requested boiler's temperature
(TCMI)
21 to TCMA °C
50°C
External command installed (switched live or
room thermostat (no = O ; yes = 1)
0 or 1
1
0 or 1
1
si
=1
Heating circuit pump linked to external
command (no = O ; yes = 1)
si
=1
Autoadaptability or automatic adjustment of the
requested temperature (no = O ; yes = 1)
0 or 1
Outside sensor (no = O ; yes = 1)
(2)
1
0 or 1
0 mantatory
si
=1
(1)
Maximum outside temperature (TEMA)
n/a
11 to 25°C
20°C
si
=1
(1)
Minimum outside temperature (TEMI)
n/a
-30 to +10°C
-5°C
si
=1
Automatic tipping up summer mode
(no = O ; yes = 1)
n/a
0 or 1
0
1 to 6 min (3)
2 min.
Indirect Hot Water production
(no = O ; yes = 1)
0 or 1
0
0 or 1
0 mantatory
0 or 1
0
Operating postponement
si
=1
DHW sensor (no = O ; yes = 1)
si
=1
Legionnaires disease free mode (off)
(no = O ; yes = 1)
si
=1
Engaging of 6 power stages
(no = O ; yes = 1)
0 or 1
0
si
=0
Engaging stage 1
(no = O ; yes = 1)
0 or 1
1
si
=0
Engaging stage 2
(no = O ; yes = 1)
0 or 1
1
si
=0
Engaging stage 3
(no = O ; yes = 1)
0 or 1
0
si
=0
Engaging stage 4
(no = O ; yes = 1)
0 or 1
1
si
=0
Engaging stage 5
(no = O ; yes = 1)
0 or 1
0
si
=0
Engaging stage 6
(no = O ; yes = 1)
0 or 1
1
n/a
(1)
:
See § 7 to set the heating diagram according to 4 paremeters (TCMA, TCMI, TEMA and TEMI)
(2)
:
Prohibited when using a scheduled external command
(3)
:
Depending on water flow rate and volume inside the heating circuit, the boiler might start at very short
intervals with wear and tear resulting. To reduce the number of cycles, increase postponement.
NOTE : To reset autoadaptability, zero parameter #
, then set value to 1.
Ascari MA12 -p. 33 -
2.22 - Operating
Display
in front of symbol "°C" means the boiler is off, connected to power supply, with anti frost
protection operating (boiler starts automatically when the boiler's temperature or the Domestic Hot Water
temperature turns below 5°C).
Press
to turn the boiler On or Off.
2.22.1 - Automatic / Manual Operation
The boiler must be set to Manual operation as follows :
Press and hold the Auto/Man button for 3 seconds. The display will show Au or Man, press the Auto/Man
button again for a short period to toggle the display so that it shows Man. With the correct display showing,
press and hold Auto/Man for 3 seconds to return to normal operating mode.
2.22.2 - Requested heating temperature setting in manual mode
Press
to display the requested temperature blinking in front of symbol "°C".
Press
or
(see § 2.21).
Press
to increase or decrease the requested temperature between TCMI and TCMA.
to confirm setting.
2.22.3 - Summer / Winter shift
(Available in manual mode only (see § 2.22.1 above)
Press
during 3 sec to start the summertime mode and lit Summertime LED;
Press
during 3 sec to start the wintertime mode and lit the Wintertime LED.
Ascari MA12 -p. 34 -
2.22.4 - Programming the maximum output setting of the boiler
The boiler is delivered with a maximum output of 12kW (parameter
ŒSet the parameter
ŒSet parameters of
output of the boiler :
= 1).
=0
to
to requested value according following tables to adjust the maximum
Power stage #
1
Power stage value
2
3
4
5
6
4 kW 2 kW 0 kW 4 kW 0 kW 2 kW
Parameter number
12 kw
Parameter value
10 kW
to obtain the
requested
8 kW
maximum output
(0 = no ; 1 = yes) 6 kW
4 kW
1
1
0
1
0
1
1
0
0
1
0
1
1
0
0
1
0
0
1
0
0
0
0
1
0
1
0
0
0
1
2.22.5 - Temperatures display
During normal operating the boiler's temperature, i.e :
1st pressure on
is on display in front of symbol "°C".
displays the ambience sensor display.
Parameter #
is displayed in front of symbol "°C"
external command status is on display in front of "bar" :
for boiler's run not requested
for boiler's run requested
2nd (or 1st if no external command) pressure displays the temperature correction in°K (parameter #
in front of symbol «°C» (see § 2.21 to zero this correction).
Temperature correction can be read on bottom display i.e.
if a negative value (-5°C in this example).
Ascari MA12 -p. 35 -
with a glittering LED down right the display
2.23 - Counters
The regulation is equiped with 6 counters to count heating cycles (the unit is 100 cycles).
Press
and
during 3 sec.
The setting menu starts (see § 6.3).
Press
during 3 sec. :
°C will be on display for counter #1, alternating with
°C and
bar,
meaning power breaker #1 K1 is totalling more than 0999 x 100 = 99.900 cycles.
Press
to shift to counter #2. Conversely press
to return to previous counter.
Starting this menu will automatically restore the weekly shift of the 6 power stages starting sequence back
to the 1 to 6 order, but will not zero the counters.
Press
and
during 3 sec. to exit the counters menu.
2.24 - Failures display
The boiler has many selectable options. Please ensure the correct selections are made for the type of
installation you have made. If you have selected the use of a room thermostat, or hot water cylinder, the
boiler will not operate until these devices are connected.
The boiler indicates a boiler fault by flashing all segments of the temperature display.
In case of boiler's temperature failure, all 14 LEDs
in front of symbol "°C" are blinking. The boiler is
off, the water pump still running.
In case of Domestic Hot Water sensor failure (if parameter
= 1), all 14 LEDs
in front of symbol
"°C" are blinking. The boiler is automatically restricted to heating.
In case of outside temperature sensor failure (if parameter
§ 2.20-), all 14 LEDS
= 1 or if used to automatic operation -see
in front of "°C" are blinking. The boiler is restricted to heating.
Please call the Dimplex Customer Service department -see Servicing section2 FLASHING SEGMENTS in front of bar -indicate the system pressure has fallen below the minimum
operating pressure.
• Check if water has discharged from the pressure relief valve. If so call a Dimplex service agent.
• Check for leakage in the system.
Once the fault has been cleared the boiler will turn on again if the system is filled and pressurised to over
0.5 bar.
Ascari MA12 -p. 36 -
2.25 - Maintenance
Once a year we recommend to have the boiler checked by a qualified technician.
- Pressure inside the heating circuit needs to be controlled a a regular basis (pressure when cold will have to
remain over 1 bar).
- Frist a few days after cut-over, later at least once a year, check electric connections tightness of the heating
elements and power supply.
2.26 - Overheating and replacement of heating elements
- Floor heating: In case of overheat the temperature limitator (60°C) will cut power supply to heating
elements .
- Radiators: The limitator (100°C) also cuts power to heating elements.
- After solving the failure, reset the boiler pressing the small red button in the middle of the sensor's head.
(see §1.3.1).
- Numerous power losses or lack of power: it might happened one (or several) connection(s) from power to
heating elements is(are) defective (powerloss) or cut (power failure). In this case change defective
element(s).
Cut the power supply, drain by using drain tap, disconnect elements, remove elements fastener and
remove/replace damaged element(s). (seer § 1.2 to access heating elements).
Front view
(electric box removed)
View from below
(Access trap-door to elements removed)
Heating elements
Drain tap with hose
O-ring
Ascari MA12 -p. 37 -
Element
fastener
Heating
elements
Cap with
drain tap
Fastening the pump
If the pump is producing some abnormal noise, slightly unscrew without creating leackage, then screw
again following instructions below.
1 - screw two opposite screws with a stroke of 3
Nm.
2 - screw the other two opposite screws with a
stroke of 3 Nm
3 - screw the first two opposite screws with a
stroke of 5 Nm.
4 - screw the last two opposite screws with a
stroke of 5 Nm.
SPARE PARTS LIST
Designation
Reference
0105276
12 MA
230 V mono
Side casing
B4484737
1
Front casing
B4484730
1
Control panel
B1758741
1
Pump
B1243544
1
Klixon 60°
B1243400
1
Klixon 100°
B1243418
1
3bar relief valve
B1239103
1
8L expansion vessel
B1472534
1
Water sensor
B1243546
1
Outside sensor (option)
B1243586
1
6kW heating element
B1243558
2
Heating element gasket
B1657044
3
20A tetrapole switch
B1243561
4
Fuse holder
B1243146
1
4A fuse size 5 x 20
B1243147
1
Display
B1943599
1
C1 electronic card
B1943600
1
Temperature display
B1243534
1
Ascari MA12 -p. 38 -
NOTE
Ascari MA12 -p. 39 -
Ascari MA12 -p. 40 -