ATTACK PLUS vertical condensate trap, diameter 60/100, AL

Product detailed description

The ATTACK PLUS vertical condensate trap, diameter 60/100, AL is part of the original flue gas exhaust and combustion air intake system ATTACK KT / KT PLUS, designed for wall-mounted condensing gas boilers ATTACK Condensing. This part belongs to the category: condensate trap – vertical version, diameter 60/100 mm, material aluminium (AL).

Closed combustion chamber and flue exhaust in ATTACK condensing boilers

ATTACK condensing gas boilers work with a closed (turbo) combustion chamber – unlike older atmospheric boilers, they do not need air from the room in which they are installed, nor a functional brick chimney. They draw combustion air directly from outside the building and expel flue gases outward likewise by forced draught, ensured by a fan built into the boiler. This closed circuit is in practice solved in two ways: by coaxial (concentric) piping, where a smaller pipe for air intake runs inside a larger pipe and the annular space serves for flue gas exhaust, or by a separate system with two independent pipes. The coaxial version with a diameter of 60/100 mm is the most common solution for boilers up to approx. 35 kW, as it allows both exhaust and intake to be routed through a single opening in the wall or roof, is quick to install and is visually unobtrusive.

Every element of the exhaust assembly – elbow, extension, condensate trap, chimney terminal and splitter – must be tight, resistant to flue gas temperatures and to the condensate that forms in large quantities during operation of a condensing boiler, precisely because the boiler is able to utilise the latent heat of water vapour from the flue gases. It is this condensate that is the reason why the ATTACK KT system cannot be safely replaced with a standard chimney component intended for atmospheric boilers – such components are not designed for permanent contact with acidic condensate, nor for the correct slope needed to direct condensate back into the boiler or into the trap.

Condensate trap – why it is essential in the assembly

The condensate trap is a component installed at the lowest point of the exhaust route – usually right behind the boiler or at the base of a vertical section leading to the roof or outside through the facade. Its task is to collect condensate flowing down the walls of the piping and direct it through a drain fitting (usually with a DN16-DN20 hose) into the boiler's siphon or into the sewer. Without a trap, condensate in longer vertical sections could flow back into the boiler uncontrollably, or leak through joints in case of incorrect slope.

Structurally, it is a short branch component with an integrated collection space in the lower part and an outlet with a hose fitting. In the horizontal version, the trap is installed directly into the horizontal exhaust section (for example right behind the boiler, if the boiler outlet is to the side), while the vertical version is inserted into a rising (or falling) vertical section, typically at a passage between floors or before exiting through the roof.

Example of a typical connection in a real installation:
boiler → 90° elbow → vertical riser pipe → condensate trap (vertical) → further extension → chimney through the roof.

Installation procedure step by step

1. Check that the location of the trap is really the lowest point of the given section of the route – if not, condensate from higher points will not be reliably collected in it.
2. Install the part in the direction of flow according to the markings, seal the joints with the integrated seal, and check that the trap sits horizontally/vertically exactly according to its design (horizontal vs. vertical).
3. Connect the drain hose to the fitting and route it with a slope towards the boiler's siphon, without kinks that could obstruct free drainage.
4. Before first starting the boiler, fill the siphon with water and visually check the tightness of all joints above and below the trap.
5. After the first days of operation, check that condensate is actually draining and not accumulating in the piping above the trap.

Material and construction

The aluminium version is used for coaxial parts that are in direct contact with hot flue gases and with condensate. Aluminium is lightweight, does not corrode in contact with acidic condensate (unlike ordinary galvanised steel without further treatment), and withstands temperature fluctuations well during boiler start-up and shutdown. Joints are sealed with silicone or EPDM seals resistant to flue gas temperatures from a condensing boiler (typically up to approx. 120 °C) and to moisture.

System classification: coaxial (concentric). Version: vertical.

Compatibility with ATTACK boilers

The PR34A part is designed for the connection system common to the entire range of wall-mounted condensing boilers ATTACK ACKT20, ACKT28 and ACKT48 (Condensing KT range), ATTACK KST24 (Condensing KST) and ATTACK KZT25 (Condensing KZT). Before ordering, we recommend verifying in the installation manual for the specific boiler model the exact type of connection port and the maximum permitted length of the exhaust route, as this may vary slightly depending on the boiler output (20, 28 or 48 kW for the KT range).

Installation and warnings

The condensate trap is always installed at the lowest point of the relevant section of the route, with a slope of at least 3° towards the collection space. The drain fitting is connected via a hose (resistant to temperature and condensate) to the boiler's siphon or to an external neutralisation device, if part of the installation. Before first starting the boiler, the siphon must be filled with water to prevent flue gases from entering the room via the drain path, and drainage patency should be checked regularly (at least once a year, during a service inspection).

Generally, horizontal exhaust sections must have a slope of at least 3° towards the boiler or towards the nearest condensate trap, so that condensate does not accumulate in the piping. Installation should be carried out by a person qualified for the installation of gas appliances and their exhaust systems, in accordance with the installation manual for the specific boiler and with standard STN EN 15287.

Standards and safety requirements

Installation of flue gas exhaust for condensing boilers in Slovakia is governed primarily by standard STN EN 15287 (Chimneys – Design, installation and commissioning of chimneys – Part 1: Chimneys for fan assisted appliances), which sets minimum distances of the terminal from windows, ventilation openings, neighbouring plots and ground level, as well as the minimum height of the terminal above the roof plane. The boiler itself and its exhaust system must also meet the requirements of STN EN 483 (type C gas boilers) and be installed in accordance with the technical operating regulations (TPP) applicable to gas equipment.

Installation may only be carried out by a person professionally qualified for the installation and servicing of gas appliances, who will issue an inspection report or commissioning report upon completion. In case of any change to the route compared to the originally approved design (e.g. additional extension of the route, change in the number of elbows), it is necessary to check that the boiler is still within the parameters permitted by the manufacturer – otherwise there is a risk not only of boiler malfunction, but also loss of warranty and, in extreme cases, a safety risk of flue gas leakage.

Maintenance and service inspection

Maintenance of this part consists primarily of regular checking of the patency of the drain fitting and the hose leading to the boiler's siphon. During a boiler service inspection (recommended once a year), the technician usually also checks this part – verifying that no deposits are forming in the collection space that could gradually restrict condensate drainage, and that the hose connections remain tight.

The recommended inspection interval for the entire exhaust route is once a year, usually as part of a regular boiler service inspection carried out by an authorised service technician. On this occasion, this specific part, the patency of the condensate path, and the overall condition of the joints along the entire route from the boiler to the outlet outside the building are also checked.

Typical usage scenarios

Scenario 1 – boiler in the basement with a short horizontal outlet: the boiler outlet is to the side, followed immediately by a horizontal section to the outer wall. In this case, the condensate trap is installed directly into this horizontal section to collect condensate before the pipe leaves the building.

Scenario 2 – boiler in the attic with a vertical rise to the roof: immediately behind the boiler, the route rises upward to the roof passage. The condensate trap is inserted into the vertical section at the base of the riser, to collect condensate flowing down from the entire length of the vertical route above it before it could return to the boiler.

Related parts in the ATTACK KT range

The vertical version of the condensate trap complements, in the ATTACK range, the horizontal version PR34 (same diameter and material, differing only in installation orientation) and the exterior version PR60 intended for facade or outdoor routing. For indoor installations with a predominantly vertical route, PR34A is the most common choice.

A complete overview of all parts of the ATTACK KT / KT PLUS flue gas exhaust system (elbows, extensions, chimney terminals, condensate traps and splitters for diameters 60/100 mm and 80 mm) can be found in the category Condensing boilers > flue exhausts, flue pipes > accessories by brand > Attack on this e-shop.

Summary

The ATTACK PLUS vertical condensate trap, diameter 60/100, AL (code PR34A) is a component of the type condensate trap – vertical version with a diameter of 60/100 mm, made of aluminium (AL) material, belonging to the coaxial (concentric) system. Recommended installation orientation: vertical. The part is designed for boilers ATTACK ACKT20, ACKT28 and ACKT48 (Condensing KT range), ATTACK KST24 (Condensing KST) and ATTACK KZT25 (Condensing KZT) and is part of the wider range of ATTACK KT exhaust components available on this e-shop, allowing a complete flue exhaust route to be assembled exactly according to the layout of the specific installation.

Frequently asked questions

When should the vertical condensate trap version (PR34A) be preferred over the horizontal one?
The vertical version is chosen when the exhaust route predominantly rises (for example, continuing upward towards the roof right behind the boiler) – in this case, the trap is inserted directly into the vertical section and collects condensate flowing down from above before it could get back into the boiler.

Can the PR34A trap be installed in several places along a longer vertical route?
Yes, for longer vertical rises it is common and recommended to install several condensate traps at regular intervals (according to the manual for the specific boiler), so that condensate is continuously drained and does not accumulate in large quantities at one place.

Do I need a functional chimney for an ATTACK condensing boiler?
No. ATTACK Condensing KT, KST and KZT condensing boilers have a closed combustion chamber with forced draught – they draw combustion air from outside and expel flue gases through their own exhaust system (coaxial 60/100 mm or separate Ø80/Ø80). A brick chimney is therefore not needed; a passage through the wall or roof for the plastic-aluminium piping is sufficient.

What is the maximum length of flue exhaust for 60/100 mm coaxial piping?
The exact value depends on the specific boiler model (ACKT20, ACKT28, ACKT48, KST24 or KZT25) and is stated in the installation manual – it is usually an equivalent length of 10–15 m, with a 90° elbow counted as approx. 1–1.5 m and a 45° elbow as approx. 0.5 m of straight pipe. Exceeding the limit increases resistance and may cause a boiler fault message.

Why does water actually drip from the flue exhaust?
The condensing boiler cools the flue gases to such an extent that the water vapour contained in them condenses – it is precisely from this additional heat that the boiler achieves its high efficiency. The resulting condensate is slightly acidic and must be drained through the condensate trap into the boiler's siphon; that is why all horizontal sections of piping have a prescribed slope towards the boiler or the trap.

Can the 60/100 mm coaxial pipe be combined with the separate Ø80/Ø80 system?
Yes, that is exactly what the splitter (e.g. PR51, PR51A or PR51B) is for, which splits a single coaxial pipe from the boiler into two separate Ø80 mm pipes. It is used for longer routes or when the intake and exhaust need to be routed in different directions.

Can parts of different diameters or from another manufacturer be combined with the ATTACK exhaust system?
It is recommended to use a certified system from the same manufacturer as stated in the manual for the specific boiler (for ATTACK Condensing boilers, this is the ATTACK KT/KT PLUS system). Combining parts of different diameters, materials or from other manufacturers may result in leaks, incorrect condensate drainage and loss of the boiler warranty.

How often should the exhaust piping and condensate trap be checked?
A visual check of joint tightness and condensate trap patency is recommended at least once a year, ideally during a regular boiler service inspection. For facade or roof terminals, it should also be checked that the terminal grille is not blocked by leaves, insects or snow.

Does the flue exhaust need to be insulated?
When routed through heated space, insulation is usually not necessary, as the surface temperature of the coaxial pipe is low. For longer sections routed through unheated space (attic, facade) or where there is a risk of moisture condensation on the pipe surface, additional insulation is recommended, especially at the location of the condensate trap, to prevent it from freezing.

What happens if the flue exhaust is undersized or too long?
If the maximum equivalent exhaust length is exceeded or in case of leaks, the boiler will usually report a fault related to flue gas/air flow (fan fault, pressure switch fault or flue path fault) and shut down for safety reasons. The solution is to recalculate the route according to the manual and, if necessary, adjust it (shorter route, fewer elbows, or switching to a separate Ø80/Ø80 system).

Can this part also be used in a cascade connection of multiple boilers?
For cascades with multiple boilers, a separate Ø80/Ø80 system with a common collecting chimney is usually used, or separate terminals for each boiler according to the cascade's project documentation. The specific components (extensions, elbows, splitters) are also compatible in this arrangement, but minimum terminal distances according to STN EN 15287 must be observed.

How do I find out exactly which parts I need for my installation?
The most reliable approach is to follow the installation manual for the specific boiler model (ACKT20/28/48, KST24, KZT25), which contains diagrams of typical connections and maximum permitted lengths. For a more complex or atypical layout (long route, passage through multiple floors, cascade), we recommend consulting an installation company or the seller directly before ordering the exact number of pieces.

Does condensate from the flue exhaust need to be neutralised before discharge into the sewer?
For typical family houses with a small boiler output, neutralisation is usually not required given the small amount of condensate and its dilution with other wastewater; however, applicable legislation and the requirements of the local sewer administrator must be observed. For higher outputs or boiler cascades, it is recommended to install a condensate neutralisation device before discharge into the public sewer.

Is operation of a condensing boiler with this type of exhaust noisier than with a classic chimney?
Forced draught (from the boiler's fan) may be accompanied by slight operating noise, which, however, is minimal with a correctly installed and mechanically secured route (without freely vibrating sections of piping) and is generally comparable to or lower than the noise of a classic atmospheric boiler with chimney exhaust.

Can installation of this part be done by yourself, or is a professional necessary?
The mechanical connection of the parts itself (push-fit system) is simple, but connecting the exhaust to the condensing boiler, calculating the maximum route length, and commissioning the boiler must be carried out by a person professionally qualified for the installation of gas appliances – this is a manufacturer requirement as well as a legal requirement for maintaining the warranty and safe operation.

Does the number and type of these parts affect gas consumption or boiler efficiency?
They do not directly affect consumption, but they do indirectly – the greater the resistance of the exhaust route (many elbows, a route close to the limit length), the more energy the boiler's fan must expend to overcome this resistance, and the sooner the boiler may limit output or report a fault. Designing the route with as few parts as necessary is therefore also advisable from the point of view of operating economy.

Warranty

This part of the ATTACK exhaust system is covered by a 24-month warranty from the date of dispatch from the warehouse, the same as for other accessories for ATTACK condensing boilers. In case of a claim, we recommend keeping the proof of purchase and, if necessary, photo documentation of the installation method, as with exhaust systems the functionality is closely linked to the correctness of the installation (compliance with slope, maximum route length and distances according to the manual).