Baxi AS 300-2E BC Troubleshooting guide

MW-2000848-02
Spain Portugal
en
Installation, User and Service Manual
Solar domestic hot water tank
AS 300–2E BC

Dear Customer,
Thank you very much for buying this appliance.
Please read through the manual carefully before using the product, and keep it in a safe place for later reference. In order to
ensure continued safe and efficient operation we recommend that the product is serviced regularly. Our service and customer
service organisation can assist with this.
We hope you enjoy years of problem-free operation with the product.

Contents
1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.1 Manufacturer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.2 Installer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.3 User's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.1 Symbols used in the manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.2 Symbols used on the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.1 Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3 Description of the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2 Main components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Installation regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Package list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4.2.1 Standard delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4.2.2 Accessories & options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Choice of the location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.1 Data plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.2 Position of the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3.3 Main dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Positioning the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.5 Levelling the domestic hot water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.6 Fitting the temperature sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7 Fitting the 1"1/2 cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.8 Fitting the immersion heater (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.9 Hydraulic connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.9.1 Primary heating circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.9.2 Connecting the tank to the domestic water circuit (secondary circuit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.10 Filling the domestic hot water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.10.1 Domestic water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.11 Filling the primary solar circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.12 Filling the heating circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 Checklist before commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.1 Domestic hot water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.2 Primary solar circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.3 Primary heating circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.4 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Commissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.1 Primary solar circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 General instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2 Safety valve or safety unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6.3 Cleaning the casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4 Checking the magnesium anode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.1 Check with anode tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.2 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.5 Removing limescale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.6 Removing and remounting the inspection hatches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.6.1 Remove the inspection hatches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
6.6.2 Putting the inspection hatches back in place . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6.7 Inspection and maintenance of the solar circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Contents
7724479 - v03 - 07102019 AS 300–2E BC 3

6.8 Maintenance form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7 Disposal and Recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
8 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1 Information on the ecodesign and energy labelling directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.1 Specific information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Contents
4 AS 300–2E BC 7724479 - v03 - 07102019

1 Safety
1.1 Safety
Danger
This appliance can be used by children aged from
8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of
experience and knowledge if they have been
given supervision or instruction concerning use of
the appliance in a safe way and understand the
hazards involved. Children shall not play with the
appliance. Cleaning and user maintenance shall
not be made by children without supervision.
Caution
Draining the domestic hot water tank:
1. Shut off the domestic cold water inlet.
2. Open a hot water tap in the installation.
3. Open a valve on the safety unit.
4. When the water stops flowing, the domestic
hot water tank has been drained.
Warning
Pressure limiter device
The pressure limiter device (safety valve or
safety unit) must be regularly operated in order
to remove limescale deposits and ensure that it
is not blocked.
A pressure limiter device must be fitted to a
discharge pipe.
As water may flow out of the discharge pipe, the
pipe must be kept open to the open air, in a
frost-free environment, and at a continuous
downward gradient.
To ascertain the type, specifications and
connection of the pressure limiter device, refer
to the chapter "Connecting the domestic hot
water tank to the drinking water mains" in the
domestic hot water tank Installation and Service
Manual.
Important
The installation, user and maintenance manual
can also be found on our internet site.
1 Safety
7724479 - v03 - 07102019 AS 300–2E BC 5

Caution
A disconnection method must be allowed in the
fixed pipes in accordance with the rules on
installation in force in the country.
Caution
If a power cord comes with the appliance and it
turns out to be damaged, it must be replaced by
the manufacturer, its after sales service or
persons with similar qualifications in order to
obviate any danger.
Warning
Respect the minimum water inlet pressure to
ensure correct operation of the appliance,
referring to the chapter "Technical
Specifications".
Warning
Before any work, switch off the power supply to
the appliance.
1.2 Recommendations
Caution
Do not neglect to service the appliance.
Service the appliance regularly to ensure that it
operates correctly.
Warning
Only qualified persons are authorised to
assemble, install and maintain the installation.
Warning
The heating water and the water-propylene-
glycol mixture must not come into contact with
the domestic hot water.
The domestic hot water must not circulate
through an exchanger.
Solar installations can be protected against
lightning and must be earthed or connected to
an equipotential connection.
To benefit from extended warranty cover, no
modifications should be made to the appliance. Only
remove the covers for maintenance and breakdown
repair operations and put the covers back in place once
these operations are complete.
Warning stickers
1 Safety
6 AS 300–2E BC 7724479 - v03 - 07102019

The instructions and warnings affixed to the appliance
must never be removed or covered and must remain
legible during the entire lifespan of the appliance.
Immediately replace damaged or illegible instructions
and warning stickers.
Warning
Never turn the power off to the solar control
system even for extended absences. The control
system protects the installation from overheating
when it is operating in the summer.
Warning
Do not modify the control system parameters
unless fully conversant with them.
During extended absences, we recommend lowering
the set point temperature in the solar DHW tank to
45°C. When the user is present, the set point should be
set to 60°C.
1.3 Liabilities
1.3.1 Manufacturer's liability
Our products are manufactured in compliance with the
requirements of the various Directives applicable. They
are therefore delivered with the marking and any
documents necessary. In the interests of the quality of
our products, we strive constantly to improve them. We
therefore reserve the right to modify the specifications
given in this document.
Our liability as manufacturer may not be invoked in the
following cases:
Failure to abide by the instructions on installing and
maintaining the appliance.
Failure to abide by the instructions on using the
appliance.
Faulty or insufficient maintenance of the appliance.
1.3.2 Installer's liability
The installer is responsible for the installation and initial
commissioning of the appliance. The installer must
observe the following instructions:
Read and follow the instructions given in the manuals
provided with the appliance.
Install the appliance in compliance with prevailing
legislation and standards.
1 Safety
7724479 - v03 - 07102019 AS 300–2E BC 7

Carry out initial commissioning and any checks
necessary.
Explain the installation to the user.
If maintenance is necessary, warn the user of the
obligation to check the appliance and keep it in good
working order.
Give all the instruction manuals to the user.
1.3.3 User's liability
To guarantee optimum operation of the system, you
must abide by the following instructions:
Read and follow the instructions given in the manuals
provided with the appliance.
Call on a qualified professional to carry out installation
and initial commissioning.
Get your installer to explain your installation to you.
Have the required inspections and maintenance
carried out by a qualified installer.
Keep the instruction manuals in good condition close
to the appliance.
1 Safety
8 AS 300–2E BC 7724479 - v03 - 07102019

2 About this manual
2.1 Symbols used
2.1.1 Symbols used in the manual
This manual uses various danger levels to draw attention to special
instructions. We do this to improve user safety, to prevent problems and to
guarantee correct operation of the appliance.
Danger
Risk of dangerous situations that may result in serious personal
injury.
Danger of electric shock
Risk of electric shock.
Warning
Risk of dangerous situations that may result in minor personal
injury.
Caution
Risk of material damage.
Important
Please note: important information.
See
Reference to other manuals or pages in this manual.
2.1.2 Symbols used on the equipment
1Before installing and commissioning the appliance, carefully read
the instruction manuals provided
2Dispose of used products in an appropriate recovery and recycling
structure
2.2 Abbreviations
CFC: Chlorofluorocarbon
DHW: Domestic Hot Water
2.3 Homologations
2.3.1 Directives
This product complies with the requirements of the following European
Directives and Standards:
Pressure Equipment Directive 2014/68/EU
Low Voltage Directive 2014/35/EU
Generic standard: EN 60335–1
Relevant Standard: EN 60335-2-21
Electromagnetic Compatibility Directive 2014/30/EU
Generic standards: EN 61000-3-2, EN 61000-3-3
Relevant standards: EN 55014–1, EN 55014–2
Fig.1
1
2MW-6000691-1
2 About this manual
7724479 - v03 - 07102019 AS 300–2E BC 9

This product conforms to the requirements of European Directive
2009/125/EC on the ecodesign of energy-related products.
In addition to the legal requirements and guidelines, the supplementary
guidelines in this manual must also be followed.
Supplements or subsequent regulations and guidelines that are valid at
the time of installation shall apply to all regulations and guidelines
specified in this manual.
2 About this manual
10 AS 300–2E BC 7724479 - v03 - 07102019

3 Description of the product
3.1 General description
The AS 300–2E BC domestic hot water tank is connected to solar
collectors by a solar station and a heat pump.
The AS 300–2E BC domestic hot water tank can use an immersion heater
as back-up.
Main components:
The tanks are made of high-quality steel lined with glazed, food-quality
standard enamel, fired to 850 °C, which protects the tank from
corrosion.
The heat exchangers welded into the tank are made of smooth piping,
that has an enamelled external surface that comes into contact with the
drinking water.
The appliance is insulated by chlorofluorocarbon-free (CFC)
polyurethane foam, which helps to reduce heat losses to a minimum.
The external casing is made of ABS.
The tanks are protected against corrosion by one or more magnesium
anodes.
An anode tester allows the wear of the magnesium anodes to be
checked.
3.2 Main components
1Top inspection hatch
2Thermometer
3Anode tester
4Side inspection hatch
5Electrical back-up (optional)
Important
If the electrical back-up (optional) is not fitted, fit a 1 1/2"
plug and its gasket (not supplied) to close the opening.
Fig.2
MW-5000829-2
1
2
3
4
3
5
3 Description of the product
7724479 - v03 - 07102019 AS 300–2E BC 11

3.3 Technical data
Tab.1
Unit AS 300–2E BC
Primary circuit: Solar exchanger
Maximum operating temperature °C 110
Maximum operating pressure MPa (bar) 1.0 (10)
Exchanger capacity litres 6.7
Exchange surface m21.2
Pressure drop at 1 m3/h kPa 3.1
Primary circuit: Back-up exchanger
Maximum operating temperature °C 110
Maximum operating pressure MPa (bar) 1.0 (10)
Exchanger capacity litres 13.2
Exchange surface m22.4
Pressure drop at 2 m3/h kPa 19.2
Secondary circuit (domestic water)
Maximum operating temperature °C 110
Maximum operating pressure MPa (bar) 1.0 (10)
Water capacity litres 300
Weight
Shipping weight - Tank package kg 140
Primary circuit performances: Back-up exchanger
Output exchange (1) kW 25.5
Performance
Hourly flow rate (ΔT = 35 °C)(1) litres/h 626
Standby heat loss (ΔT=45K) kWh/24h 2.10
(1) Primary temperature: 55 °C - Domestic cold water inlet: 10 °C - Domestic hot water outlet: 45 °C - Primary flow rate: 2 m3/h
Tab.2 Technical parameters for hot water storage tank
Product name Unit AS 300–2E BC
Storage volume V litres 300
Standing loss S W 88
3 Description of the product
12 AS 300–2E BC 7724479 - v03 - 07102019

4 Installation
4.1 Installation regulations
Important
Only qualified professionals are permitted to install the domestic
hot water tank, in accordance with prevailing local and national
regulations.
Danger
Limit temperature at draw-off points: the maximum domestic hot
water temperature at the draw-off points is the subject of special
regulations that vary from country to country in order to protect
consumers. These special regulations must be observed when
installing the appliance.
France:
Caution
The system must satisfy each point in the rules that govern works
and interventions in individual homes, blocks of flats or other
buildings.
4.2 Package list
4.2.1 Standard delivery
The delivery includes:
One domestic hot water tank.
One installation, user and service manual.
4.2.2 Accessories & options
A detailed list of accessories and options can be found in our catalogue.
4.3 Choice of the location
4.3.1 Data plate
The data plate must be accessible at all times.
The data plate identifies the product and provides the following
information:
Type of domestic hot water tank.
Date of manufacture (Year - Week).
Serial number.
Fig.3
L000381-A
4 Installation
7724479 - v03 - 07102019 AS 300–2E BC 13

4.3.2 Position of the appliance
Caution
Install the appliance in a frost-free location.
1. Position the appliance as close as possible to the draw-off points in
order to minimise energy losses through the pipes.
2. Place the appliance on a base frame to facilitate cleaning of the area.
3. Install the appliance on a solid, stable structure able to bear its weight.
4.3.3 Main dimensions
AS 300–2E BC
Fig.4
B
C
D
A
E
F
ØG
55°
K
83.5
83.5
7
1
4
3
6
9
MW-5000825-2
8
5
2
1Domestic hot water outlet G1"
2Domestic hot water recirculation G3/4"
3Exchanger inlet G1"
4Domestic hot water sensor
5Exchanger outlet G1"
6Domestic cold water inlet and drain opening G1"
7Solar exchanger inlet G3/4"
8Solar exchanger outlet G3/4"
9Solar sensor position
Caution
G: Cylindrical threading, sealed by sheet gasket
Tab.3
AS 300–2E BC
A70.5
B602
C992
D1319.5
4 Installation
14 AS 300–2E BC 7724479 - v03 - 07102019

AS 300–2E BC
E1743.5
F1845.5
G (Ø) 605
K537
4.4 Positioning the appliance
Caution
Have 2 people available.
Handle the appliance with gloves.
1. Remove the packaging from the calorifier but leave the calorifier on
the shipping pallet.
2. Remove the protective packaging.
3. Remove the three screws securing the tank to the pallet.
4. Lift the tank and place it in its final position, respecting the distances
shown on the diagram.
4.5 Levelling the domestic hot water tank
The domestic hot water tank is levelled using the three feet (supplied in
the bag) to be screwed to the bottom of the domestic hot water tank.
1. Screw the three adjustable feet to the bottom of the domestic hot
water tank.
2. Level the appliance using the adjustable feet.
Adjustment range: 10 mm.
Use metal blocks under the feet of the tank if necessary.
Caution
Do not place the blocks on the exterior sides of the domestic hot
water tank.
4.6 Fitting the temperature sensors
1. Position the probe in the sensor tube, using the sensor tube
separator.
The sensor tube separator is provided in the documentation bag.
2. Check that the probes are correctly positioned in the sensor tube.
3. Check the mounting of the sensor tube separator.
For more information, see
Main dimensions, page 14
Fig.5
MW-5000828-2
350
200
200
Fig.6
L000382-A
1
2
Fig.7
L000383-A
1
2
3
4 Installation
7724479 - v03 - 07102019 AS 300–2E BC 15

4.7 Fitting the 1"1/2 cap
Important
If the immersion heater option is not fitted:
The cap and its insulation are supplied in an accessories bag.
A plug and its new 1 1/2" gasket (not supplied) must be fitted
before using the water tank.
1. Insert the insulation into the cap.
2. Fit the cap in place.
3. Lock the cap by turning it.
4.8 Fitting the immersion heater (optional)
1. Affix the washer to the 1 1/2" connector.
Important
The washer is located in the accessories bag.
2. Fit the immersion heater into position along with a new gasket.
3. Connect the immersion heater by following the instructions in the
manual.
4.9 Hydraulic connections
4.9.1 Primary heating circuit
Before connection, flush the primary circuit to remove any particles that
may damage certain devices (safety valve, pumps, valves, etc.)
1. Hydraulically isolate the primary and domestic circuits with stop valves
to facilitate maintenance on the tank. The valves make it possible to
carry out maintenance on the tank and its components without
draining the entire installation.
2. Carry out installation in compliance with the applicable legislation and
standards.
Fig.8
1
1
2
3
L000877-A
Fig.9
1
22
MW-L000878-2
4 Installation
16 AS 300–2E BC 7724479 - v03 - 07102019

4.9.2 Connecting the tank to the domestic water circuit
(secondary circuit)
When making the connection, it is imperative that the standards and
corresponding local directives be respected. Insulate the pipes to keep
heat losses to a minimum.
Specific precautions
Before making the connection, flush the drinking water inlet pipes in order
not to allow metal or other particles into the appliance's tank.
Safety valve
Caution
In accordance with safety rules, a safety valve calibrated to 7 bar
(0.7 MPa) is mounted on the domestic hot water tank's domestic
cold water inlet.
Integrate the safety valve in the cold water circuit.
Install the safety valve close to the DHW tank in a place with easy
access.
9Isolation valve
17 Drain valve
27 Non-return valve
28 Domestic cold water inlet
29 Pressure reducer
30 Safety unit
54 End of the discharge pipe free and visible 2 to 4 cm above the flow
funnel
55 Safety valve 0.7 MPa (7 bar)
Sizing
The diameter of the safety unit and its connection to the tank must be at
least equal to the diameter of the domestic cold water inlet on the tank.
There must be no cut-off devices between the safety valve or unit and
the domestic hot water tank.
The discharge pipe in the safety unit valve must not be blocked.
To avoid obstructing the flow of water in the event of overpressure:
The safety unit discharge pipe must have a continuous, adequate
gradient.
The cross section of the discharge pipe from the safety unit must be at
least equal to the cross section of the opening on the safety unit outlet.
Isolation valves
Hydraulically isolate the primary and domestic circuits with isolation valves
to facilitate maintenance on the domestic hot water tank. The valves make
it possible to carry out maintenance on the domestic hot water tank and its
components without draining the entire installation.
These valves are also used to isolate the domestic hot water tank when
conducting a pressurised check on the tightness of the installation if the
test pressure is greater than the admissible operating pressure for the
domestic hot water tank.
Connecting the domestic cold water
Connect to the cold water supply according to the hydraulic installation
diagram.
The components used for the connection to the cold water supply must
comply with the prevailing standards and regulations in the country
concerned.
Fig.10
L000370-C
(54)
2 cm
99
55
29
17
27
30
28
4 Installation
7724479 - v03 - 07102019 AS 300–2E BC 17

Install a water drain in the boiler room and a funnel-siphon for the safety
unit.
Fit a non-return valve to the domestic cold water circuit.
Install a dielectric union on the domestic cold water inlet.
Pressure reducer
If the supply pressure exceeds 80% of the safety valve or unit calibration
(e.g.: 0.55 MPa/5.5 bar for a safety unit calibrated to 0.7 MPa/7 bar), a
pressure reducer must be located upstream of the appliance.
Install the pressure reducer downstream of the water meter in such a way
as to ensure the same pressure in all of the system's pipes.
Domestic hot water circulation loop
To guarantee the availability of hot water as soon as the taps are turned
on, a circulation loop between the draw-off points and the recirculation
pipes in the domestic hot water tank can be installed. A non-return valve
must be included in this loop.
Run the domestic hot water circulation loop via the boiler control system or
an additional timer program to optimise energy consumption.
Measures to take to prevent hot water flow return
Fit a non-return valve to the domestic cold water circuit.
4.10 Filling the domestic hot water tank
Caution
Initial commissioning must be performed by a qualified
professional.
1. Flush the domestic water circuit and fill the tank through the cold
water inlet pipe.
2. Open a hot water tap.
3. Completely fill the domestic hot water tank via the cold water inlet
pipe, leaving the hot water tap open.
4. Close the hot water tap when the water flow is regular, without any
noises in the pipes.
5. Carefully vent all of the domestic hot water pipes by repeating steps 2
to 4 for each hot water tap.
Venting the domestic hot water tank and the mains network helps to
prevent noises and banging caused by trapped air moving through the
pipes during draw-off.
6. Vent the DHW tank exchanger circuit using the air vent provided for
this purpose.
7. Check the safety components (particularly the safety valve or safety
unit), referring to the instructions provided with those components.
Caution
During the heating process, a certain amount of water may
escape via the safety valve or unit because of the expansion of
the water. This phenomenon is perfectly normal and no steps
should be taken to prevent it.
4.10.1 Domestic water quality
In regions where the water is very hard (Th > 20 °fH (11 °dH)), we
recommend fitting a softener.
The water hardness must always be between 12 °fH (7 °dH) and 20 °fH
(11 °dH) to be capable of providing effective protection against corrosion.
The softener does not bring about a derogation from our warranty
provided that it is approved and set pursuant to the codes of practice and
the recommendations given in the instructions for the softener and is
regularly inspected and maintained.
4 Installation
18 AS 300–2E BC 7724479 - v03 - 07102019

4.11 Filling the primary solar circuit
See
Installation and commissioning instructions for the solar station.
4.12 Filling the heating circuit
See
Installation and service manual for the boiler or heat pump.
4 Installation
7724479 - v03 - 07102019 AS 300–2E BC 19

5 Commissioning
5.1 Checklist before commissioning
Caution
If the temperature in the solar collectors is higher than 130 °C, the
control system operates in safety mode. Wait until the evening
before starting-up or cooling down (covering) the solar collectors.
5.1.1 Domestic hot water tank
1. Before commissioning, the heating installation must be completely
emptied and flushed.
2. Make sure that all valves on the circuit are opened.
3. Fill the installation with water and check that it is watertight.
5.1.2 Primary solar circuit
See
Installation and commissioning instructions for the solar station.
5.1.3 Primary heating circuit
See
Installation and service manual for the boiler or heat pump.
5.1.4 Electrical connection
1. Check the electrical connection, particularly the earthing.
5.2 Commissioning procedure
Warning
Initial commissioning must be performed by a qualified
professional.
During the heating process, water can flow through the bleed
circuit to guarantee the safety of the installation. This
phenomenon is perfectly normal and no steps should be taken
to prevent it.
5.2.1 Primary solar circuit
See
Installation and commissioning instructions for the solar station.
5 Commissioning
20 AS 300–2E BC 7724479 - v03 - 07102019