Vaillant Ecofit Pure 425 Boiler Instruction Manual

Name: Vaillant Ecofit Pure 425 Boiler Instruction Manual
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Vaillant Ecofit Pure 425 Boiler Instruction Manual

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Vaillant Ecofit Pure 425 Boiler

Vaillant Ecofit Pure 425 Boiler Instructions

Here we offer the Vaillant Ecofit Pure 425 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 Ecofit Pure 425 Boiler, we suggest checking the Frequently Asked Questions (FAQs) section of this manual.

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Vaillant Ecofit Pure 425 Boiler Specifications

Category	Specification	Value
Heating Data
Max. Flow Temperature Adj. Range	Default: 75 °C	10 … 80 ℃
Maximum Permissible Pressure		0.3 MPa (3.0 bar)
Nominal Water Flow (ΔT = 20 K)		1,094 l/h
Nominal Water Flow (ΔT = 30 K)		729 l/h
Approx. Condensate Volume (50/30 °C)	pH value between 3.5 and 4.0	2.55 l/h
G20 Power/Loading Data
Maximum Heat Output (P)		25 kW
Effective Output Range (P) at 40/30 °C		6.5 … 27.0 kW
Effective Output Range (P) at 50/30 °C		6.4 … 26.5 kW
Effective Output Range (P) at 80/60 °C		6.1 … 25.4 kW
Domestic Hot Water Heat Output (P)		6.0 … 30.0 kW
Maximum Heat Input – Heating (Q max.)		25.5 kW
Minimum Heat Input – Heating (Q min.)		6.1 kW
Maximum Heat Input – Hot Water (Q max.)		30.6 kW
Minimum Heat Input – Hot Water (Q min.)		6.1 kW
General Data
Gas Category		I2H
Gas Pipe Diameter		1/2 inch
Heating Connections Diameter		3/4 inch
Expansion Relief Valve Connector (min.)		15 mm
Condensate Drain Pipework (min.)		21.5 mm
G20 Gas Supply Pressure		2.0 kPa (20.0 mbar)
Gas Flow at P max. – Hot Water (G20)		3.2 m³/h
Gas Flow at P max. – Heating Mode (G20)		2.7 m³/h
Gas Flow at P min. (G20)		0.648 m³/h
CE Number (PIN)		CE-0063CP3646
Flue Gas Mass Rate (Heating Mode, P min.)		2.81 g/s
Flue Gas Mass Rate (Heating Mode, P max.)		11.5 g/s
Flue Gas Mass Rate (Hot Water, P max.)		13.8 g/s
Flue Gas Temperature (80/60 °C, P max.)		77 °C
Flue Gas Temperature (80/60 °C, P min.)		55 °C
Flue Gas Temperature (50/30 °C, P max.)		62 °C
Flue Gas Temperature (50/30 °C, P min.)		35 °C
Flue Gas Temperature (Hot Water Mode)		68 °C
Flue Gas Temperature (Overheating)		95 °C
Released System Types		C13, C33, C43, C53
Nominal Efficiency at 80/60 °C		98.8 %
Nominal Efficiency at 50/30 °C		104.0 %
Nominal Efficiency at 40/30 °C		106.0 %
Nominal Efficiency (Partial Load 30%) at 40/30 °C		109.7 %
NOx Class		5
Product Dimensions (Width x Depth x Height)		375 mm x 295 mm x 602 mm
Net Weight		22 kg
Weight when filled with water		26 kg
Electrical Data
Electric Connection		230 V / 50 Hz
Built-in Fuse (Slow-Blow)		T2/2A, 250V
Max. Electrical Power Consumption		35 W
Standby Electrical Power Consumption		2 W
Level of Protection		IPX4D

Vaillant Ecofit Pure 425 Boiler Details

The Vaillant Ecofit Pure 425 Boiler is engineered as a highly efficient heat generator, designed for closed heating installations and hot water generation. It bears the CE label, confirming compliance with essential directives, and is a licensed member of the Benchmark Scheme. This scheme ensures that products are correctly installed, commissioned, and serviced by competent persons according to manufacturer instructions and building regulations.

Unlike some boilers, the Ecofit Pure 425 does not require compartment ventilation. This is due to its high efficiency, resulting in very low heat loss from the casing during operation. The boiler is exclusively certified and fitted with a concentric flue system, ensuring a sealed combustion process and preventing flue gases from entering the room air.

Installation necessitates careful attention to several factors. Minimum clearances are crucial: 150mm at the top (or 75mm for rear flue), 150mm at the bottom, 5mm at the sides (70mm if side sections are removed), and 600mm at the front. These clearances ensure safe operation and accessibility for maintenance. The product must be transported by at least two people due to its weight, emphasizing safe lifting techniques.

The boiler features a user-friendly operating concept, with controls described in the operating instructions. For installers, a dedicated "installer level" provides access to advanced diagnostics and setting options. This level allows for fine-tuning system parameters, viewing live status codes, and accessing check programmes for purging, maximum/minimum load, and filling modes.

Heating water quality is paramount for the Ecofit Pure 425. It is critical to ensure that the water has a pH value between 6.5 and 8.5 (at 25°C) and that hardness levels meet specified guidelines. The use of unsuitable additives, such as certain frost or corrosion protection agents, biocides, or sealants, can lead to material damage, component changes, and operational issues, potentially voiding warranties.

The condensate discharge pipework must be installed with a continuous fall of 45mm per metre, be made of suitable materials like PVC, and be well-insulated to prevent freezing, especially if routed externally. Electrical installation requires a fixed connection with a contact opening of at least 3mm and a common 230 V, 50 Hz, ≤3 A fused supply for the boiler and its controller, strictly performed by qualified electricians.

Maintenance is essential for the longevity and efficiency of the Vaillant Ecofit Pure 425. Annual inspections are recommended, including checking the CO₂ content, gas flow rate, and overall condition of components like the heat exchanger and burner seals. A comprehensive service record should be maintained, as outlined in the Benchmark commissioning checklist, to track all inspection and maintenance activities.

Troubleshooting is facilitated by a system of fault codes (F.xx) that appear on the display, signaling specific issues. The boiler stores the last 10 fault messages in its memory, accessible via the installer level. In case of persistent faults or issues, the use of only original spare parts is strongly recommended to maintain product conformity and safe operation.

Frequently Asked Questions (FAQs)

Can't find the answer you need? Here are some frequently asked questions about the Vaillant Ecofit Pure 425 Boiler, and we answer them below.

What should I do if I smell gas near the Vaillant Ecofit Pure 425 Boiler?

Immediately avoid the area, open windows, do not use flames or electrical switches. If safe, close the gas isolator cock, warn others, evacuate, and call the gas supply company from outside the building.

Who is qualified to install and maintain the Vaillant Ecofit Pure 425 Boiler?

Only competent persons with sufficient qualifications should carry out set-up, dismantling, installation, start-up, inspection, maintenance, repair, and decommissioning, strictly adhering to current technology and national regulations.

Are there specific requirements for heating water quality for this boiler?

Yes, the heating water quality must be sufficient, with a pH value between 6.5 and 8.5 at 25°C. Water hardness must meet specific guidelines, and unsuitable additives or oxygen ingress should be avoided to prevent corrosion.

What are the minimum clearances required around the Vaillant Ecofit Pure 425 for installation?

Minimum clearances are: 150 mm (top, for upper air/flue connection; 75 mm for rear), 150 mm (bottom), 5 mm (sides, or 70 mm if side sections need removal), and 600 mm (front).

How often should the Vaillant Ecofit Pure 425 Boiler be inspected and maintained?

The product requires annual inspection and maintenance. For products not under an annual service agreement, maintenance must be carried out at least once every five years to ensure optimal performance and safety.

How do I check for fault codes on the Vaillant Ecofit Pure 425 Boiler?

You can access the installer level (by pressing the 'reset' and 'i' buttons simultaneously, then entering code 17). Navigate to the 'fault codes' (F) menu, where the display will show the number of faults and individual F.xx codes.

What should I do if a fault message (F.xx) appears on the display?

Refer to the 'Overview of fault codes' in the appendix of the manual to identify the cause. You can try pressing the reset button (a maximum of three times). If the fault persists, contact customer service.

Can I use any type of additive for frost or corrosion protection in the heating water?

No, only specific additives like Adey MC1+, Fernox F1/F2, or Sentinel X 100/X 200 are approved for permanent use. Unsuitable additives can cause material damage, noise, and subsequent system issues.

How is the condensate discharged from the boiler, and what considerations are there for the pipework?

Condensate is discharged via a dedicated pipe, which must have a continuous fall (45 mm per metre), be made of suitable material (e.g., PVC), and be insulated to prevent freezing, especially when routed externally.

What is the 'Burner anti-cycling time' and how does it function?

The burner anti-cycling time is an electronic restart lockout, active for a specific period (set via diagnostics code d.02) after the burner switches off in heating mode. This prevents frequent on/off cycling, reducing energy losses.

Is compartment ventilation required for the Vaillant Ecofit Pure 425 Boiler?

No, compartment ventilation is not required. These boilers are very high-efficiency appliances with low heat loss from the casing and are exclusively certified for use with a concentric flue system, making separate ventilation unnecessary.