When installing central heating, it needs to be set to a level that allows to satisfy heat and hot water needs. During its life span, you may need to adjust the speed of the device and since the central heating pump can´t do it automatically, it is necessary to do it manually. The reasons leading to a need for adjustment are various, and corrosion is one of them. When corrosion is the main problem, it is necessary to clean the device and remove dirt or rust that has accumulated. The problem may also be related to the central heating pump being worn out and needs to be replaced.
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Setting the speed involves a tradeoff between the water noise produced when the settings are too high, and a weak flow in case of too little speed.
Different Types of Pumps According to Speed Settings:
1. Fixed Speed
There is constant pressure present, which is similar to what you can find in variable speed heat pumps, but the difference lies in the fact that those can utilise three different speed settings, while the fixed speed naturally only works at the one it has been set to.
2. Three Speed
As mentioned before, they consist of a system with three different speed settings, which reflect three different pressure intensities, or flow charts.
3. Variable Speed
There is constant pressure over a wide range of flow rates. This system is never used in systems with radiators having thermostatic control, since there is a chance that it can cause boiler damage.
4. Twin Heat
This system is composed of a common inlet to two pumps, which have individual outlets. One outlet is used to keep the heat system going, while the other is used for heating water and transporting it.
In general, the system you will stumble upon the most is the three speed system. The table below shows how to set the speed using this system.
Read more: Top 23 FAQs About Heat Pumps