Dimplex ASCARI MA12 Installation Manual

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INSTALLATION GUIDE

Ref. : 1871184 - 0107103

ASCARI MA12

ELECTRIC HEATING BOILER

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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

CONTENTS

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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.

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1.2 - Install Options

1. SPACE HEA TING 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

ManMan AutoAuto

0 bar0 bar

4 bar

nde

8 litre Expansion vessel

3-speed pump

Room thermostat

3-port diverter valve

3bar pressure relief valve

Air bleeders

Hot water outlet

Cylinder thermostat

manifold

Differential Pressure Valve

W-Plan

10 way connector

Switched Live

Two-port valve

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.

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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

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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 if boiler connected to indirect hot water cylinder

0 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. )

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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.

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2 - INSTALLATION & DEVICING INSTRUCTIONS

Features

• Selectable Water Temperature

- radiators/ Underfloor (21-80

• 60

C or 100oC thermal cut-out suitable for underfloor heating or radiators

• Room Thermostat operation

• Frost Protection, 5

C 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 inst all 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.

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2.2 - Impor tant Infor mation

• 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.

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• 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 0.5Bar (0.05MPa) Maximum 2.5 Bar (0.25MPa) Nominal 2 Bar (0.2MPa)

Water Temperature

Minimum 21

Maximum 80oC

Water Flow Rate

Minimum 350litres/hour Nominal 700litres/hour Maximum 1400litres/hour

Thermal Limit

100

C Radiators

60oC Underfloor

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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.

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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.

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.

Thermal cut-out selection

(100deg C for radiators, 60deg C for underfloor)

60°C 100°CConnector

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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.

• 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

to the product and the wiring to a thermostat (if used).

• The location must be free from frost and excessive moisture.

300

100

2.6 - Installation

2.6.1 - Main Unit

•

Once the location of the boiler has been selected,

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.

• 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).

• With suitable equipment or an assistant raise the

boiler to the fixing point and ensure each screw has engaged into the mounting slots. T ighten 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

Overall frame

pattern

Ø8 screw plug

300

605

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2.6.2 - Plumbing

2.6.2.1 - Radiators / Underfloor

• 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 60

C thermal cut-out must

connected in place of the factory selected 100

C 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.

Room

thermostat

Radiators

Service

valves

Under Floor safety limiter

if used with hot water cylinder

Air bleeders

Pump

Expansion

Relief

Valve

Expansion

vessel

Underfloor heating

Drain

tap

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• 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) 0,50 0,75 1,00 1,50

Total Water in heating system (litres) 96 84 73 50

For larger systems Multiply the volume of water by these factors

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:

Stop

valve

Temporar y Flexible Hose

Connection

To be removed

immediately after filling

Mains water

supply

Pressure Pump &

reducing valve

(if required)

Cistern &

Overflow

Mains water

supply

Heating

System

Return

Double

check

valve

assembly

Stop

valve

Stop

valve

Heating

System

Return

METHOD B

METHOD A

Recommended and approved method for filling closed circuits in a house (R24-2a Water Regulations Guide)

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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 sep arate 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 inst alled to control the appliance. Thermost atic

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.

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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.

* Remove blue connectors between power terminal and elements

according to drawing.

ex-work

R : Red Bl : Black W : White B : Blue

12 kW 10 kW*

8 kW* 6 kW*

4 kW*

BBBB

WBl WBlR

BBB

WBl WBlR

BBB

WBl WBlR

RBBWBl WBlR

View from bellow

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.

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• 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 on-

off 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.

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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 - Ser vicing

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

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Decoding

1 - 3 speed pump 2 - 8 liters expansion vessel 3 - 3 bar safety relief bleeder 4 - La ck of water sensor 6 - 60°C safety limitator 7 - 100°C safety limitator 8 - Boiler's sensor 9 - Control pannel 11 - Fuse



 









2.13 - Dimensions - Hydraulic connections

D = Heating outflow 1" female nut (26/34) R = Heating backflow 1" female nut (26/34)

(Trapdoor to access elements removed)

405 300

619

Power wire entry

Accessories

connection entries

Side view

Front view

Bottom view

Top view

Safety relief drain

Ø15

87,5

Elements

fastener

Heating elements



259

280

Drain tap

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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

2.14 - Power ter minal

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.

Screw A

5 self-sealing nuts for accessories connections

(Ambience thermostat, outside and/or Domestic Hot

Water sensor and remote cut-out)

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.

Plastic cap moved from top to bottom

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Ascari MA12 -p. 23 -

2.15 - Connection to the electricity supply

I: 63A fused supply on the consumer unit

via a double pole limited switch with minimum contact gap of 3mm.

OTE : Stripped length of wires between 16 and 17mm

Neutral 16²

Phase 16²

Ground 16²

Page 24

Ascari MA12 -p. 24 -

2.16 - Regulation circuit drawing

2.16.1 - Operating from a switched live

L1 : Live N : Neutral F : 4A fuse size 5 x 20 C1 : Electronic card with display CC : 3 speed pump SC : Boiler's sensor

AQS1 : 60°C safety limitator with manual reset

AQS2 : 100°C safety limitator with

manual reset K1 to K4 : 20A power breakers DT : Total cut-out (remove the bridge) DP1 & DP2 : Partial cut-out (remove the

bridge) R : External command relay

Decoding :

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Ascari MA12 -p. 25 -

2.16.2 - Direct room thermostat connections and direct cylinder thermostat

L1 : Live N : Neutral F : 4A fuse size 5 x 20 C1 : Electronic card with display CC : 3 speed pump SC : Boiler's sensor AQS1 : 60°C safety limitator with

manual reset

AQS2 : 100°C safety limitator with

manual reset

K1 to K4 : 20A power breakers

DT : Total cut-out (remove the

bridge)

DP1 & DP2 : Partial cut-out (remove the

bridge) R : External command relay Room thermostat : Direct room thermostat no-

volt normally open contacts Cylinder thermostat : External command from

direct cylinder thermostat

(normally open contact

240V)

Decoding :

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Ascari MA12 -p. 26 -

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.

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Ascari MA12 -p. 27 -

2.17.2 - Direct room ther mostat connections and direct cylinder ther mostat

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.

Page 28

Ascari MA12 -p. 28 -

Légende :

AQS 1

60°C

white

yellow

grey

GND

OUT

+Vdc

230 V / 12 V

adaptator

6 5

black

red

yellow

white

pink

grey DHW sensor

pink Outside sensor (S.Ext)

grey

white white

boiler's sensor (SC)

ambience thermostat (TA)

red

blue

black

orange

5678

NNN

red

black

white

blue

AQS 2

100°C

blue

red

black

white

blue

(1)

: In optionnal

CC : 3-speed pump DHW sensor : Domestic Hot Water Safety limitor SC : Boiler's sensor

PH : Phase N : Neutral F : 4A fuse size 5 x 20 C1 : Electronic card with display

NPH

brown

blue

DHW pump C.ECS

Heating pump CC

230V power

pressure sensor power

pressure sensor connect.

2.18 - Wiring dia gr ams

brown

green

yellow

blue

external command relay contact

GND 1

+Vdc 2

OUT 4

brown

Page 29

Ascari MA12 -p. 29 -

AQS1 : 60°C Safety limitor with manual reset

AQS2 : 100°C safety limitor with manual reset

Légende :

L4 A1

L2 L3

L1 L4 A1

T4T3T2

L2 L3

T4T3

red

balck

white

red

black

white

red

white

yellow

white

black

blue

red

black

red

balck

blue

T1 T2

bleu

red

black

white

brown brown

blue

black

red

yellow

white

red

K1 to K4: 20A power breakers

T1 & T2 : 6kW heating elements

live

External

command

Page 30

Ascari MA12 -p. 30 -

3 speed (I, II et III) water pump for adjustment to operating needs, depending on insulation and circuit

Electric datas

IIIIII

III

IIII

Speed

Nominal

output (W)

Nominal

inten s ity (A)

III

90 0,40

67 0,30

47 0,20

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.

2.19 - 3 Speed water pump

Page 31

Ascari MA12 -p. 31 -

bar

° C

Auto

Manu

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)

Winter mode green LED

Operating display red LED

Used to increase temperature during settings (instant touch)

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)

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)

On/Off switch (with automatic anti frost protection for DHW and heating circuits) (instant touch)

Hot Water selection (n/a) or start the spring mode DHW (press 3 sec.)

Used to decrease temperature during settings (instant touch) or cancel (press 3 sec)

Summer mode green LED

2.20 - Control pannel description

Page 32

Ascari MA12 -p. 32 -

For fitter's use only. The regulation must be adjusted according the use of the boiler.

• Press

and (3 sec) to start setting menu for 4 minutes.

• Parameter #

starts blinking in front of "°C"

• Press

or (instant touch) to select next parameter, i.e °C, ... until °C

• To start setting the displayed parameter press

or (instant touch).

• The parameter value, i.e

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.

2.21 - Regulation settings

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Ascari MA12 -p. 33 -

Available if Paremeter # Description Setting range Ex-word settings

Electric boiler (no = O ; yes = 1) 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

si = 1

Heating circuit pump linked to external command (no = O ; yes = 1)

0 or 1 1

si = 1

Autoadaptability or automatic adjustment of the requested temperature (no = O ; yes = 1)

0 or 1

(2)

Outside sensor (no = O ; yes = 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

utomatic tipping up summer mode

(no = O ; yes = 1)

n/a 0 or 1 0

Operating postponement

1 to 6 min

(3)

2 min.

Indirect Hot Water production (no = O ; yes = 1)

0 or 1 0

si = 1 DHW sensor (no = O ; yes = 1) 0 or 1 0 mantatory

si = 1

Legionnaires disease free mode (off) (no = O ; yes = 1)

n/a 0 or 1 0

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

PARAMETERS LISTING

Press and during 3 sec to access parameters menu.

(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.

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Ascari MA12 -p. 34 -

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 to increase or decrease the requested temperature between TCMI and TCMA. (see § 2.21).

Press 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.

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Ascari MA12 -p. 35 -

2.22.5 - Temperatures display

During normal operating the boiler's temperature, i.e : is on display in front of symbol "°C".

1st pressure on

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.

with a glittering LED down right the display

if a negative value (-5°C in this example).

2.22.4 - Programming the maximum output setting of the boiler

The boiler is delivered with a maximum output of 12kW (parameter = 1).

Set the parameter = 0 Set parameters of

to to requested value according following tables to adjust the maximum

output of the boiler :

123456

4 kW 2 kW 0 kW 4 kW 0 kW 2 kW

12 kw110101

10 kW100101

8 kW100100 6 kW100001 4 kW010001

Power stage # Power stage value Parameter number

Parameter value

to obtain the

requested

maximum output

(0 = no ; 1 = yes)

Page 36

Ascari MA12 -p. 36 -

2.24 - Failures display

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

= 1 or if used to automatic operation -see

§ 2.20-), all 14 LEDS

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.

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.

Page 37

Ascari MA12 -p. 37 -

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.

- 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).

View from below

(Access trap-door to elements removed)

Heating elements

Front view

(electric box removed)

O-ring Heating

elements

Element fastener

Drain tap with hose

Cap with drain tap

2.25 - Maintenance

2.26 - Overheating and replacement of heating elements

Page 38

Ascari MA12 -p. 38 -

 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.

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

SPARE PARTS LIST

Designation Reference

0105276

Page 39

Ascari MA12 -p. 39 -

NOTE

Page 40

Ascari MA12 -p. 40 -