Vaillant ecoTEC Plus 428 Boiler Instruction Manual

Name: Vaillant ecoTEC Plus 428 Boiler Instruction Manual
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Vaillant ecoTEC Plus 428 Boiler Instruction Manual

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Vaillant ecoTEC Plus 428 Boiler

Vaillant ecoTEC Plus 428 Boiler Instructions

Here we offer the Vaillant ecoTEC Plus 428 Boiler manual completely free and in English. We have cataloged this manual in the Boilers section on Manualverse, and it has been rated by 1 users with an average rating of 5. If you have any specific questions about Vaillant ecoTEC Plus 428 Boiler, we suggest checking the Frequently Asked Questions (FAQs) section of this manual.

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Vaillant ecoTEC Plus 428 Boiler Specifications

Description	Unit	ecoTEC plus 428
Maximum CH heat input (net)	kW	28.6
CH heat output (80/60 °C)	kW	5.3 - 28.2
CH heat output (50/30 °C)	kW	5.7 - 30.6
SEDBUK Band		A
SAP Seasonal Efficiency	%	90.6
NOx Class		5
"lP rating"		IPX4D
Inlet gas working pressure required (natural gas)	mbar	20
Gas supply (G20) Gross CV (s.t.)	MJ/m³	37.8
Maximum gas rate	M³/h	3.03
Minimum gas rate	M³/h	0.56
Burner % CO2 (Case on)	%	9.3 + 0.2 - 0.5
Gas connection (compression)	mm	15
Water connections (compression)	mm	22
Condensate drain (internal diameter)	mm	19 min.
Fuse ratings fan supply PCB	A	3.15 AT
Main PCB	A	125 mAT
Minimum flow rate of water through the boiler	L/min.	20.3
Weight	kg	3.3
Electrical supply	V~/HZ	230/~50
External fuse	A	3
Power input	W	60
Case height	mm	600
Case width	mm	375
Case depth	mm	334

Vaillant ecoTEC Plus 428 Boiler Details

The Vaillant ecoTEC Plus 428 is a sophisticated wall-hung open-vent condensing boiler, designed for both open-vented and sealed water heating systems. Once configured, its operation is entirely automatic, offering convenient and efficient heating for your home. A crucial safety and comfort feature is its built-in frost protection, which activates the burner and system pump if the internal temperature drops to 3°C, provided both electricity and gas supplies are active. This helps prevent system damage during colder periods.

For enhanced operational transparency and troubleshooting, the boiler integrates a comprehensive diagnostic system. This system clearly indicates the current operational status and provides vital information for commissioning and fault finding. The ecoTEC Plus 428 is initially configured for Natural Gas (G20) but can be expertly converted to LPG (G31 propane) by a competent person, ensuring adaptability to various fuel sources. This flexibility, coupled with its advanced controls, makes it a versatile heating solution for diverse property types.

This model boasts high efficiency, achieving a Class 'A' SEDBUK rating. A visible plume of water vapour from the flue terminal is a normal characteristic of its efficient condensing operation, especially in cooler, damp weather. Installation flexibility is provided through various flue options, including standard 100mm or 125mm diameter horizontal or vertical room-sealed fan-assisted (RSF) flues, with extensions and bends available to accommodate complex routing. The compact design allows for easy mounting on internal walls, though proper clearances for servicing and air circulation are essential.

Safety is paramount, with the boiler featuring an overheat thermostat and a system that halts operation if the condensate drain becomes blocked. It also includes a pump exercise programme that runs for one minute after a power cut or every 23 hours to prevent pump seizure. For optimal system longevity, thorough flushing with a suitable cleanser and subsequent application of an inhibitor for stainless steel heat exchangers are strongly recommended, adhering to BS7593 guidelines.

The ecoTEC Plus 428 can be connected to unvented hot water cylinders, including Vaillant's uniSTOR range, which have capacities from 125 to 310 litres. Installation in bathrooms (zones 2 and 3) is permissible, provided all electrical controls are safely positioned out of reach from baths or showers. Vaillant offers a two-year parts and labour warranty, contingent on installation and commissioning by a CORGI registered (in the UK) or otherwise competent person, underlining the importance of professional expertise.

Frequently Asked Questions (FAQs)

Can't find the answer you need? Here are some frequently asked questions about the Vaillant ecoTEC Plus 428 Boiler, and we answer them below.

What type of gas does the Vaillant ecoTEC Plus 428 use, and can it be converted?

The boiler is supplied factory-set for Natural Gas (G20). However, it can be field-adjusted for use with LPG (propane G31) by a competent person, following specific instructions and requiring a combustion analyser.

Does the boiler have frost protection?

Yes, the ecoTEC Plus 428 features a built-in frost protection programme. As long as the electricity and gas supplies remain active, the device will operate the burner and system pump if the boiler's internal temperature drops to 3°C, preventing freezing.

What should I do if I smell gas or suspect a leak?

Immediately cease all electrical activity (don't switch lights or appliances), avoid naked flames, turn off the gas supply at the meter, open windows and doors, warn others, and evacuate the premises. Then, contact your gas supplier or a competent service agent from outside the hazardous area.

Why is there a plume of water vapour coming from the flue terminal?

This is normal for condensing boilers like the ecoTEC Plus 428. It's a sign of high efficiency and a low flue gas temperature. The plume is water vapour and may be more noticeable in wet or damp weather, indicating correct boiler operation.

How often should the Vaillant ecoTEC Plus 428 boiler be serviced?

For continued efficient and safe operation, annual servicing by a competent, CORGI registered person is recommended. The frequency may vary slightly based on installation conditions and usage, but yearly checks are generally sufficient.

What is covered by the Vaillant warranty for this boiler?

Vaillant provides a full two-year parts and labour warranty, provided the appliance is installed and commissioned by a competent person in accordance with Gas Safety Regulations and manufacturer instructions. Failure to comply may invalidate the warranty.

What should I do if the boiler fails to ignite?

If the burner fails to ignite after five attempts, the boiler will display a "F.28" or "F.29" fault code. You can manually reset the fault by pressing and holding the reset button for one second. If the issue persists after three resets, consult the troubleshooting section of the manual or a service engineer.

Can the ecoTEC Plus 428 be installed in a bathroom?

Yes, this boiler is suitable for installation in bathroom zones 2 and 3. However, electrical switches and boiler controls powered by the mains supply must be positioned out of reach of anyone in the bath or shower, adhering to relevant electrical regulations.

Is water treatment necessary for the heating system?

Yes, it is essential. Before installing the new boiler, existing systems must be thoroughly flushed. For both new and existing systems, a suitable cleanser (e.g., Sentinel X300/X400, Fernox Superfloc) should be used, followed by an inhibitor (e.g., Sentinel X100, Fernox) suitable for stainless steel heat exchangers, in accordance with BS7593.

What happens if the condensate drain becomes blocked?

As a safety feature, the boiler will stop working if the condensate drain is blocked, which can happen due to ice formation in freezing conditions. You can attempt to release an ice blockage with warm cloths on the pipe. If the fault persists, contact your installation/servicing company.