Vaillant EcoTEC Plus 624 Boiler Instruction Manual

Name: Vaillant EcoTEC Plus 624 Boiler Instruction Manual
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Vaillant EcoTEC Plus 624 Boiler Instruction Manual

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📖 Manual 📋 Specifications 📝 Summary 💬 FAQs

Vaillant EcoTEC Plus 624 Boiler

User Manual

16 pages

Installation Guide

64 pages

Vaillant EcoTEC Plus 624 Instructions

Here we offer the Vaillant EcoTEC Plus 624 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 624 Boiler, we suggest checking the Frequently Asked Questions (FAQs) section of this manual.

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Vaillant EcoTEC Plus 624 Boiler Specifications

Specification	Value
CH Heat Output Range (80°C/60°C)	8.7 – 24.0 kW
CH Heat Output Range (60°C/40°C)	9.0 – 24.7 kW
CH Heat Output Range (50°C/30°C)	9.2 – 25.5 kW
CH Heat Output Range (40°C/30°C)	9.4 – 26.0 kW
Category	II2H3P
SEDBUK Band	A
SAP Seasonal Efficiency	91.2 %
Inlet Gas Working Pressure (G20 Natural Gas)	20 mbar
Inlet Gas Working Pressure (G31 Propane)	37 mbar
Connected Load (G20)	2.6 m³/h
Connected Load (G31)	1.90 kg/h
Exhaust Mass Rate (Min Thermal Load)	4.2 g/s
Exhaust Mass Rate (Max Thermal Load)	11.2 g/s
Exhaust Temperature (Min Thermal Load)	40 °C
Exhaust Temperature (Max Thermal Load)	83 °C
NOx Class	5
Protection Class	IP X4D
Max. Flow Temperature	85 °C
Adjustable Flow Temperature	30 – 85 °C (Default: max. 75 °C)
Maximum CH System Pressure	3.0 bar
Circulating Water Volume (ΔT=20 K)	1032 l/h
Approx. Condensation Volume (50°C/30°C)	2.2 l/h
Pump Delivery Height	250 mbar
Exhaust Flue	60/100 mm
Flue Categories	C13, C33, C43, C53, C83, B23, B33
10 L Expansion Vessel Pre-charge Pressure	0.75 bar
Connections Heating Flow/Return	22 mm
Gas Inlet	22 mm
Pressure Relief Discharge Pipework (Min.)	15 mm
Condensate Drain (Min. Internal Drain)	19 mm
Dimensions (H x W x D)	720 x 440 x 335 mm
Weight (Boiler Only)	37 kg
Primary Water Content	2.1 L
Electrical Supply Voltage	230/50 V ~/Hz
Internal Fuse (Slow) Main Voltage	2 A
Power Input	110 W
Gas Council Number	41-044-47

Vaillant EcoTEC Plus 624 Boiler Details

The Vaillant EcoTEC Plus 624 is a compact, wall-mounted, room-sealed, fan-assisted condensing boiler. As a system boiler, it is specifically designed to provide central heating efficiently and works seamlessly with a separate indirect hot water cylinder. This setup ensures that your heating and hot water demands are met automatically and economically, adjusting its output to optimize energy consumption.

A key feature of the EcoTEC Plus 624 is its sophisticated digital information and analysis system. The boiler's display provides real-time information, including the current heating flow temperature, system pressure, operating mode, and any relevant error codes. User controls are intuitive, comprising an 'i' information button, optional built-in timer, plus/minus buttons for navigation, and a 'Reset' button for addressing issues.

For central heating, the boiler allows for precise control of the maximum radiator temperature, which can be adjusted from 30 °C to 85 °C, with a factory default of 75 °C. During warmer months, a convenient "summer operation" mode can be activated to switch off the heating function while maintaining the ability to heat your indirect hot water cylinder.

The EcoTEC Plus 624 is highly compatible with external room or outside temperature controllers, offering enhanced comfort and further energy savings. An integrated anti-cycling economiser control prevents wasteful short cycling of the boiler during central heating operation, improving efficiency and prolonging component life. This means there might be a slight delay when increasing the room thermostat setting.

Safety and reliability are paramount, with a built-in frost protection function that activates if the boiler's internal water temperature drops below 5 °C, heating the circuit to approximately 30 °C. It is crucial to remember that this function protects only the boiler itself; additional measures may be required to safeguard other parts of the heating system from freezing. Furthermore, an automatic pump spin control operates the pump once every 23 hours to prevent seizure during periods of inactivity.

Designed for sealed central heating systems, the boiler comes fully tested and assembled with its own circulating pump and expansion vessel. It features a siphonic condensate discharge system to minimize freezing risks and an automatic air vent for efficient system bleeding. The internal circulating pump has two steps, allowing for capacity adjustments, and an adjustable automatic by-pass valve is included, pre-set at around 250 mbar.

Frequently Asked Questions (FAQs)

Can't find the answer you need? Here are some frequently asked questions about the Vaillant EcoTEC Plus 624 Boiler, and we answer them below.

How do I turn the Vaillant EcoTEC Plus 624 Boiler ON and OFF?

To turn the boiler ON, set the main ON/OFF control to the “I” position. To turn it OFF, switch the control to the “0” position. Please note that frost protection and monitoring systems are only active when the boiler is ON and connected to the electrical supply.

How do I check the heating system pressure on my boiler?

The boiler has a pressure gauge and a digital display. For correct operation, the gauge indicator should be in the dark grey zone (between 1.0 and 2.0 bar) when the system is cold. You can see the exact pressure digitally by pressing the “-” button.

What should I do if the system pressure is too low?

If the pressure falls into the light grey area (below 0.8 bar) on the gauge, or the display shows fault code F.22, F.23, or F.24, the system needs refilling. The boiler will automatically shut off if the pressure drops below 0.3 bar.

How do I adjust the heating temperature for my radiators?

You can adjust the maximum radiator temperature using the dedicated control knob. Turning it clockwise increases the temperature, while turning it anti-clockwise decreases it. The recommended settings vary with the season, but the flow temperature is typically set up to 75 °C.

Can I switch off the heating during summer while still having hot water?

Yes, you can activate a “summer operation” mode. Simply turn the maximum radiator temperature control knob all the way to the left. As the EcoTEC Plus 624 is a system boiler, it will continue to respond to demand from your external hot water cylinder.

How does the boiler's frost protection feature work?

The boiler has an integral frost protection function. If the heating water temperature within the boiler drops below 5 °C (when the main switch is ON), the boiler will activate and heat its circuit to approximately 30 °C. Keep in mind, this protects the boiler itself but cannot guarantee water circulation throughout the entire heating system to prevent other pipes from freezing.

What do fault codes F.28 or F.29 indicate, and how do I clear them?

These codes signify ignition problems. F.28 means the boiler failed to ignite during startup attempts, while F.29 indicates the flame went off during operation. To reset the fault, press and hold the “Reset” button for one second. If the issue persists after three attempts, contact your installer or Vaillant Service Solutions.

How often should my EcoTEC Plus 624 boiler be serviced?

An annual inspection by a competent heating engineer is required to determine the boiler's condition. While inspections are yearly, comprehensive maintenance, including cleaning and adjustments, should be performed as needed, but no less frequently than every five years.

What is the factory guarantee for the Vaillant EcoTEC Plus 624 Boiler?

The Vaillant EcoTEC Plus 624 comes with a two-year factory guarantee. For the second year of the guarantee to remain valid, an annual service must be carried out by a competent person one year after the installation date.

What is the “anti-cycling economiser control”?

This built-in feature helps prevent energy waste by stopping the boiler from rapidly turning ON and OFF for very short periods when in central heating mode. This improves efficiency, though it may introduce a short delay before heating starts after adjusting the room thermostat.

What should I do if I smell gas near the boiler or in my property?

If you detect a gas smell, immediately stop using any electrical switches or naked flames. Turn off the gas supply at the meter, open all windows and doors, warn other occupants, and evacuate the building. Contact your gas supplier or a competent person immediately from a safe location.

How do I ensure the condensate trap is filled, and why is this important?

To fill the condensate siphon, remove its lower part by turning the bayonet catch anti-clockwise. Fill it with water until about 10mm below the upper edge, then refit it. This is crucial because operating the boiler with an empty condensate trap can allow fumes to escape into the room, posing a poisoning risk.