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When fitting a hydronic (wet) central heating system you have to consider how the warm air will permiate your living space. Here Alde UK give our advice on designing your bespoke Alde central heating system.
The correct siting of the heating circuit, the pipes, convectors and radiators, is fundamental to the performance and efficiency of the central heating system. It should be your main design consideration.
If your boiler produces 5.5 kW of power but you only have 0.8 kW of convector/radiator, the boiler must run for longer to permiate the living space with 5.5 kW of heat.
Likewise, vents should be located in the bottom-rear and top-front of overhead louvres to avoid cold and damp pockets along the ceiling.
It's easy to get too focused on convectors and radiators, or the rubber connectors needed, or the boiler itself. It's all plumbed into the one heating circuit.
(A single-pipe heating circuit isn't a disadvantage in the Alde system because pipe runs are short and all on one floor.)
When using the 2928-420 or 2928-433 circulation pump specifically, ensure it's fitted so that the pump's impeller sits above the Flow pipe. Don't screw the tank cap too tight or the impeller will clatter against the expansion tank.
22 mm aluminium tube should be lodged 30 mm into Alde rubber connectors and securely fastened at 10-15 mm on the connector.
Without convectors or radiators, how will heat transfer from the heating circuit into the living space? Using Alde aluminium convector as a standard, we can produce a rough guide* to the minimum amount needed to adequately heat your living space.
|Living space area (m²)||Total length of aluminium convector (m)||Output (kW)|
*This is only a rough guide to get you started. You must also consider how well ventilated the heating circuit is, how well insulated the living space is, how the boiler will be controlled and the end user's habits. Ultimately any central heating system should be tested in situ in a cold chamber if possible.
It's crucial to pressure test the heating circuit before it's filled. The tester should maintain 1 bar of pressure for 30 seconds. Remember, it will be twice the work to correct mistakes at this late stage, so care and attention to detail during the build will save time later on.
When recommissioning a system, ensure it is flushed with hot water to remove the old antifreeze solution and other detrius.
To fill or purge a system, use the Alde service pump to avoid trapped air. Trapped air is a nuissance, and furthermore if trapped in the internal heat exchanger it may cause serious damage to the boiler.
After the heating circuit is filled with a mix of 50% G13 Spec antifreeze and 50% deionised water, performance testing can be carried out in a cold chamber. Alde International Systems AB offer free of charge cold chamber testing, by appointment, at their facility in Sweden.