Retrofitting, Installation & Troubleshooting

HVAC retrofitting - installation, maintenance, troubleshooting

Theory is fine, but practice on the job site is what determines the final result. In this section, we take the designs off the desk and into the building.

Discover how to overcome the enormous challenges of a renovation (such as integrating new technologies into old networks) and review the strict installation protocols every technician must follow. Plus, find detailed regular maintenance guides and a complete Troubleshooting guide to immediately address the most common faults in your system.

Retrofit Challenges

Building from scratch is easy. But energy-upgrading a 30-year-old home requires expertise. See how you can modernise your system without demolishing the entire building.

Heat Pump with Old Radiators (Cast Iron/Panel).

Does it actually work? What you need to change, how to check your pipework and what the correct supply temperature is before proceeding with installation.

Underfloor Heating Over Existing Tiles/Mosaic.

Renovation made easy. Discover dry-build systems (no cement) that offer minimal thickness and zero weight on the old slab.

Retrofit infographic - heat pump with radiators, underfloor overlay, hybrid

Replacing an Oil Boiler with Natural Gas.

The transition steps. What is required for your flue (stainless steel liner), how the new gas runs are done and what paperwork is needed.

Central Air Conditioning in Old Buildings.

How to run concealed pipe and duct routes for Multi or VRV systems without needing to drop the entire house with plasterboard ceilings.

Hybrid Systems in Renovation.

Don't throw out your old boiler. When it is worth keeping it connected to the new heat pump as a backup system (Bivalent Point) for frost days.

Installation Protocols & Commissioning

A top-of-the-range machine performs terribly if installed incorrectly. This is the control checklist for the professional installer and the demanding owner who wants to know the job was done right.

Heat Pump Commissioning: The 5 SOS Settings.

What the installer MUST do before leaving. A guide to setting the weather compensation curve, checking flow rate and temperature limits.

Vacuum Creation in AC Units & Heat Pumps.

The golden rule of refrigeration. Why installing without a vacuum pump leaves moisture inside the pipes, reduces performance and destroys the compressor.

Installation infographic - commissioning, vacuum, flushing, frost protection

Flushing & Cleaning New Pipework.

Before the first system start-up. How we clean burrs, dust and soldering residue from pipes to prevent valve blockages.

Condensate Traps & Dry Traps.

Why do AC traps dry out in winter? How they bring sewer odours (and fail the Blower Test) and why mechanical "Dry Traps" are the only solution.

Frost Protection for Monoblock Heat Pumps.

How we protect external water networks from bursting in sub-zero temperatures, using anti-freeze valves and Heat Tracing cables.

Regular Maintenance & Network Hygiene

Regular maintenance is not an expense, it is an investment. What needs to be done every year so your system does not burn a single extra euro on electricity and lives trouble-free for 20 years.

Power Flushing: Chemical Network Cleaning.

The salvation of old installations. How high-pressure machines clean the black sludge from radiators that "chokes" the circulator and drops performance.

Annual Gas/Oil Boiler Service.

More than a simple clean. The enormous importance of flue gas analysis (CO, CO₂) with an electronic analyser for maximum economy and safety.

Maintenance infographic - power flushing, flue gas analysis, Legionella

Filter & Coil Cleaning in AC / Fan Coils.

DIY steps. How to properly clean filters and louvres to breathe healthy air and save electricity from a machine that is struggling.

Legionnaires' Disease (Legionella) Prevention.

Critical for hotels and homes. How thermal disinfection cycles (heating water above 60°C) are programmed in boilers and hot water networks.

Antifreeze (Glycol) & Expansion Vessel Check.

The tasks every maintenance engineer forgets. How we measure the air pressure in the vessel and check the antifreeze fluid in solar panels and heat pumps.

Fault Diagnosis & Troubleshooting

The first-aid section for your home. Before calling the technician, see how you can diagnose the most common faults yourself and save time and money from unnecessary visits.

"The radiator is hot on top and cold at the bottom" (or vice versa).

What is happening? How to diagnose whether trapped air, thick sludge or a broken circulator is to blame, and how to bleed correctly (DIY).

The Heat Pump (or AC) Keeps Defrosting.

Is it producing steam and stopping? Learn whether it is a fault, refrigerant shortage, or simply the normal "Defrost" cycle due to high outdoor humidity.

Troubleshooting infographic - radiator, defrost, leak, error codes

Water Leak from the AC Unit (Inside the house).

The wall is soaked. What causes it and how to easily unblock the indoor unit's condensate drain with simple steps.

The Boiler / Heat Pump Shows a Pressure Error.

Has the pressure dropped to zero? How to check if the auto-fill valve is faulty, the expansion vessel has ruptured, or there is a hidden leak under the floor.

Error Codes and Inverter Boards.

What do the flashing lights mean? How to read the error code and exactly what to tell the refrigeration technician on the phone before they visit.

Main HVAC Guide

Return to the full heating-cooling guide for energy production, hydraulic networks, ventilation, automation and energy design.

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Need help?

Planning a renovation or facing a system fault - contact us for expert guidance.