Installation & Servicing instructions ATAG iC-Range
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9.6 Hot water supply
Connection of the drinking water installation should be done according to the Water Supply (Water Fittings)
Regulations and Scottish Water Byelaws.
The ATAG iC boiler is fitted 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 flowing through the plate heat exchanger up to 60°C (adjustable) instantaneous.
The water mains installation must comply with the Water Supply (Water Fittings) Regulations and Scottish
Water Byelaws. See also chapter 9.3.
In regions with a water hardness value higher than 200ppm (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 calcification ATAG recommends applying a water softener.
ATAG recommends the use of for instance AlphaPhos for cleaning plates exchangers.
The hardness of the water is variable in the United Kingdom. The water company can provide exact
information about this.
The domestic water installation can be connected to the boiler by means of 15mm compression fittings.
If the mains is fitted with water meter, check valves or loose jumper stop cock, then a DHW expansion device
must be fitted.
The boiler is provided with a DHW flow restrictor. The flow restrictor ensures that a quantity of water supplied
has a guaranteed temperature of 45°C (assuming a cold water temperature of 10°C) at its specified flow rate.
The amount of water is virtually unaffected by the water pressure.
After installation, check the hot water flow rate with a fully opened hot water tap,
If required the flow restrictor can be removed. (See chapter 15.3)
9.7 Condensation drain pipe
The ATAG condensing boiler has the >88% Efficient SEDBUK 2009 for high energy efficiency in heating and
domestic hot water. The ATAG wall hung gas fired condensing boiler contain a siphonic condensate trap to
collect and realease condensate. The amount of condensate formed is determind by the type of boiler and
the water temperature produced by the boiler.
Condensate pipework.
Use plastic pipework of an internal diameter no less then 19mm ID (typically 22mm OD).
Routing of the pipework,
The condensate pipework must fall at least 45mm per metre away from the boiler, taking the shortest
practicle route to the termination point.
Support the pipe at least every 50 cm for near horizontal sections and 1 metre for vertical sections.
Wherever possible, the condensate pipework should be routed internally to prevent freezing. In order to
minimise the risk of freezing during prolonged very cold spells, one of the following methods of terminating
condensate drainage pipe should be adopted.
Internal pipework
Wherever possible, the condensate drainage pipe should be terminated at a suitable internal foul water
discharge point such as (a) an internal soil and vent stack or (b) an internal kitchen or bathroom waste pipe,
washing machine waste pipe etc. A suitable permanent connection to the foul waste pipe should be used.
Figures 9.7.1, 9.7.2(a), 9.7.2(b) show appropriate connection methods.
The possibility of waste pipes freezing downstream of the connection point should be considered when
determining a suitable connection point - e.g. a slightly longer pipe run to an internal soil stack may be
preferable to a shorter run connecting into a kitchen waste pipe discharging directly through the wall to an
external drain.
Where “gravity discharge” to an internal termination is not physically possible (e.g. the discharge point is
above the appliance location, or access is obstructed by a doorway), or where very long internal pipe runs
would be required to reach a suitable discharge point, the following measures may be adopted.
