Installation & Servicing instructions ATAG A-Series
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6.6 Hot water supply (DHW Combi boilers)
Connection of the drinking water installation should be done according to the national
water laws.
The ATAG A Combi boilers are tted with a stainless steel plate heat exchanger for
producing domestic hot water. The boiler does not have a hot water store and in case of
a demand for hot water the boiler will heat the domestic water owing through the plate
heat exchanger up to 60°C instantaneous.
The water mains installation must comply with the British water regulations.
In regions with a water hardness value higher than 267 ppm (2,67 mmol/l),
calcium deposits should be removed from the plate heat exchanger on a regular
basis. If problems occur when using sanitary water with a chlorine content
higher than 150 mg/l, no recourse can be made to the terms of the warranty.
In order to prevent calcication ATAG recommends installing a water softener.
ATAG recommends the use of AlphaPhos for cleaning plate heat exchangers.
The hardness of the water is variable in Great Brittain and Ireland. The water company
can provide exact information about this.
The domestic water pipes can be connected to the installation by means of
compression ttings / adapter ttings. The cold water inlet on the Combi boilers
must be provided with the following (counted in the water ow direction):
- Dosing valve (supplied),
- Safety group,
- Expansion vessel 6 bar (potable water, blue).
In the cold water pipe in the boiler a ow restrictor (supplied loose) can be installed if
required. The ow restrictor ensures that a quantity of water supplied has a guaranteed
temperature of 60 °C (assuming a cold water temperature of 10°C). The amount of water
is virtually unaffected by the water pressure.
After installation, check the hot water ow rate with a fully opened hot water tap,
If required the ow restrictor can be tted as follows:
- Turn off the mains water supply to the boiler
- Open a hot water tap to depressurise the hot water pipe
- Remove the boilers front cover
- Undo with a closed wrench or size 15 ring spanner the ow restrictor plug tting
- Insert the ow restrictor according gure 6.6.a. O-ring should point downwards
- Ret the plug tting
- Turn on mains water inlet and purge water through all taps
- Replace the boilers front cover.
ow restrictor
Figure 6.6.a
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