Dimplex ASCARI MA 12, ASCMA 12 Installation And Servicing Instructions

INSTALLATION AND SERVICING INSTRUCTIONS

BE GIVEN TO THE USER

TO

Ref. : 1871184 - 0106157

Cast iron installed

electric boiler

Made in France

Model MA

• Electronic regulation

• 1 heating circuit

Model : ASCMA 12

Informations given in this manual are not contractuals, may therefore change technical caractéristics or components without notice

Ascari - 12kW -page 1 -

CONTENTS

1 - Generalities............................................................................................................... p. 04

1.1 - Introduction ................................................................................................................................. p. 03

1.2 - Important information................................................................................................................... p. 03

1.3 - Description.................................................................................................................................. p. 04

1.4 - Dimensions - Hydraulic Connections........................................................................................... p. 06

1.5 - Datas.......................................................................................................................................... p. 07

2 - Installation ................................................................................................................. p. 08

2.1 - Location...................................................................................................................................... p. 08

2.2 - Fitting the boiler .......................................................................................................................... p. 08

2.3 - Hydraulic connections................................................................................................................. p. 09

2.4 - Mixing valve ................................................................................................................................ p. 09

2.5 - Expansion vessel - Pressure safety relief .................................................................................... p. 09

2.6 - Frost protection........................................................................................................................... p. 09

2.7 - Bleeding...................................................................................................................................... p. 09

2.8 - Plumbing .................................................................................................................................... p. 10

2.9 - Filling loop .................................................................................................................................. p. 10

3 - Electric connections .................................................................................................. p. 11

3.1 - Electric flow rate, number and cross-section of power connectors,

fuse protection ............................................................................................................................ p. 12

3.2 - Power terminal ............................................................................................................................ p. 14

3.3 - Connection to mains depending on power supply ........................................................................ p. 15

3.4 - Regulation circuit ........................................................................................................................ p. 16

3.5 - Control accessories wiring .......................................................................................................... p. 17

3.6 - Wiring diagrams.......................................................................................................................... p. 18

3.7 - Heating elements connections .................................................................................................... p. 20

4 - Basic hydraulic patterns............................................................................................. p. 21

4.1 - Direct heating circuit ................................................................................................................... p. 21

5 - 3 speed water pump.................................................................................................. p. 22

6 - Electronic 2 circuits regulation ................................................................................... p. 23

6.1 - Généralities ................................................................................................................................ p. 23

6.2 - Control command pannel ............................................................................................................ p. 24

6.3 - Setting the regulation .................................................................................................................. p. 25

6.4 - Operating .................................................................................................................................... p. 27

6.5 - Counters ..................................................................................................................................... p. 29

6.6 - Failures display........................................................................................................................... p. 29

7 - Heating diagram........................................................................................................ p. 31

7.1 - Underfloor heating ....................................................................................................................... p. 31

7.2 - Radiators .................................................................................................................................... p. 31

7.3 - Specific heating diagram ............................................................................................................. p. 32

8 - Maintenance.............................................................................................................. p. 33

9 - Troubleshooting......................................................................................................... p. 33

Spare p arts ............................................................................................................... p. 34

Ascari - 12kW -page 2 -

1 - GENERALITIES

Features

• Selectable Water Temperature

- radiators / Underfloor (21-80°C)

• 60°C or 100°C 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.

1.1 - 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
conversation areas.

The unit is supplied ready for operation as a 12kW 230V sigle 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 4kW upon which the boiler will proportionnaly 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 60°C or 100°C the boiler is suitable for
standard wet radiators 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.

1.2 - 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 installaed are sufficiently strong to take the weight of the unit plus
its water contents.

Ascari - 12kW -page 3 -

• 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 ther 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).

1.3 - Description

1.3.1 - Settings for low temperature systems (floor heating only)

ASCARI boiler is supplied ready for connection to a high temperature system ranging from 0 to 80 °C with

a high temperature safety limitator set at 100 °C (radiators or floor heating and Domestic Hot Water production).
For connection to a low temperature system ranging from 21 to 50 °C with a high temperature limitator set at

60 °C, adjust parapeter #
limitator.

The two safety limitators are located over the electric pannel (see Pic. 1 below).

Safety limitators with manual reset

Dual connector

(TCMA) to a 50°C or lower value (see § 6.3) and connect the 60 °C safety

60°C

100°C

Ex-work wiring for high temperature system with 100°C high temperature cut-out

Ascari - 12kW -page 4 -

Electric connection of the 60°C temperature limitator for use with a low temperature system.

60°C

100°C

Dual connector

60°C

100°C

Disconnect the dual
connector and connect the
two female connectors to the
60°C safety limitator .

1.3.2 - Water temperatures settings summary

Parameter # 02

Heating system

Floor heating (ex-work

settings)

Radiators

or floor heating with

Domestic Hot Water

production (ex-work

settings)

Maximum boile r's

temperature (TCMA)

see § 6.3

21 - 50°C

22 - 80°C

Safety limitator AQS

60°C

permanent

100°c

permanent

Ascari - 12kW -page 5 -



 













1.4 - Dimensions - Hydraulic connections





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

Side view

87,5

(Trapdoor to access elements removed)

Heating elements

Bottom view

Front view

1

6
8

405
300

Elements fastener

29

7

4

3

619

2

9

11

Safety relief drain

Power wire entry

Accessories

connection entries

Ø15

Top view

DR

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

81

259

280

Ascari - 12kW -page 6 -

1.5 - Datas

ASCARI

Designation

12 MA

230 V mono

Heat exchanger
Elements
Maximum output P1 (ex-work wiring)
Nbr of power stages
230 V mono 50Hz * power supply
230V tri 50Hz * power supply

Maximum output P1 adjustment * changing
heating elements wiring

Remote cut-out of one or two power stages
Water capacity 5 litres

2 heaters comprising 3 x 2kW incoloy elements

Cast iron

12 kW

4

YES

NO
P4 = 6kW
P3 = 8kW

P2 = 10 kW

6 kW

Expansion vessel
Water connections
Minimum pressure
Nominal pressure
Maximum pressure
Minimum temperature
Maximum operating temperature
Minimum water flow
Nominal water flow
Maximum water flow
Weight
Dimensions Width 405 mm

Height

80 °C (ex-work) adjustable to 50°C

8 litres

1" (26/34)

0,5 bar

2 bar

3,0 bar

21 °C

350
700

2400 l/h

38 Kg

620 mm

Security class
Power rate at 70°C

* : see § 3.3

Depth

Ascari - 12kW -page 7 -

280 mm

IPX1

3,40 kWh / 24 h

2 - INSTALLATION REQUIREMENTS

2.1 - 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 rounting of electric cables to
the product and the wiring to a thermostat (if used).

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

2.2 - Fitting the boiler

10

100

10

300

2.21 - 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 - 12kW -page 8 -

2.2.2 - Main unit

• Once the location of the boiler has been selected,
mark the hole positions as per firgures 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 strengh
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. 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.

29

Overall frame

pattern

300

Ø8 screw plug

605

Ø8 screw plug

2.3 - Hydraulic connection

Connections to heating circuit are located atop the boiler. Left connection for outflow, right connection for
backflow (see § 1.2).

UU

HEAHEA

HEA

HEAHEA

SESE

U

SE

SESE

UU

TINGTING

TING

TINGTING

MANDMAND

MAND

MANDMAND

OUTFLOUTFL

OUTFL

OUTFLOUTFL

AA

TT

A

T

AA

TT

OO

WW

O

W

OO

WW

ORILORIL

ORIL

ORILORIL

ANDAND

AND

ANDAND

YY

Y

YY

BRASSBRASS

BRASS

BRASSBRASS

BB

AA

CKFLCKFL

B

A

CKFL

BB

AA

CKFLCKFL

CONNECTCONNECT

CONNECT

CONNECTCONNECT

OO

WW

WITHOUTWITHOUT

O

W

WITHOUT

OO

WW

WITHOUTWITHOUT

ORSORS

ORS

ORSORS

SUPPLIEDSUPPLIED

SUPPLIED

SUPPLIEDSUPPLIED

REMOREMO

REMO

REMOREMO

VINGVING

VING

VINGVING

ONON

ON

ONON

THEMTHEM

THEM

THEMTHEM

..

.

..

2.4 - Mixing valve

Ascari installed boiler easily support a backflow temperature higher than the ambient temperature of

surrounding area, which makes unnecessary the use of a mixing valve.

2.5 - Expansion - Pressure safety relief

Expansion is collected by a pressurized 8 liters vessel.
Safety relief bleeder must be connected to a bleed collector with drain (see § 1.2).

2.6 - Antifreeze

Use ethylene glycol only with incorporated corrosion inhibitor .
Glycol ratio must be under 10 %.

2.7 - Bleeding

Make sure to have a bleeding point at the highest level of the hydraulic circuit.

Ascari - 12kW -page 9 -

2.8 - Plumbing

• 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 thermost at this is required for automatic adjustment of boiler
output temperature.

• Where underfloor heating is being used, the 60°C thermal cut-out must connected in place of the factory
selected 100°C device (see section 1.3.1).

• 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.

• 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 follow :

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 water by these factors 0,0833 0,093 0,109 0,156

2.9 - 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 tipes are shown below : METHODS OF FILLING A SEALED SYSTEM

Recommended and appro v ed method for filling closed circuits in a house.

(R24-2a Water Regulations Guide)

METHOD A

T emporary Flexible Hose

Connection

T o be removed

immediately after filling

F

METHOD B

Cistern &

Overflow

F

Mains
water

supply

Stop

valve

Double

check

valve

assembly

Stop

valve

Heating

System

Return

Ascari - 12kW -page 10 -

Mains
water

supply

Pressure Pump &

reducing valve

(if required)

Stop

valve

Heating

System

Return

3 - ELECTRIC CONNECTIONS

IMPORTANT NOTICE

Electric connections might be loosed during transportation.

To avoid abnormal overheat, carefully check quick connection terminals and screwed connections.

• 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 wia a double pole linked switch with minimum contact gap of 3mm. No other appliances
should be powered from this 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.

• External command (a phase 230V common to the boiler must be connected to terminal 25).

• The power supply cable 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. 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 350 litre/hour circulation. Further guidance can be obtained from the Domestic Heating
and Hot Water Guide to the building regulations.

Ascari - 12kW -page 11 -