Installation instructions E-SHR series page 10
6.2 Expansion vessel
All ATAG Premier boilers are provided with an internal
expansion vessel.
The vessel of the E-SHR 15, 24 and 24T is positioned
inside the boiler casing. this expansion vessel has a pre-
charge pressure of 1 bar and a capacity of 8 litres.
The vessel of the E-SHR35T is positioned directly beneath
the boiler and together with the casing forms a single entity
with the boiler.
The expansion vessel is located vertically behind the
casing, which can be removed by pulling forwards. The
expansion vessel has a pre-charge pressure of 1 bar and
a capacity of 12 litres.
If a larger capacity expansion vessel is needed for the
installation a standard expansion vessel should be fitted
additionally.
If the internal expansion vessel is not sufficient, choose an
expansion vessel volume, of which the summary is geared
to the installation’s water capacity. The pre-charge
pressure depends on the installation height above the
expansion vessel (Table 4). Fit the expansion vessel into
the return pipe as close as possible to the boiler.
6.4 Gas connection
The appliance pipe is fitted with an internal thread, into
which the tail piece of the gas tap can be screwed.
United Kingdom:
The gas supply must comply to the current Gas Safety
Regulations.
Ireland:
- Irish standard 813
- Domestic gas installations
The connection to the appliance must include a suitable
method of disconnection and a gas control cock must be
installed adjacent to the appliance for isolation purposes.
The nominal inlet working gas pressure measured at the
appliance should be 20 mbar for Nat gas (G20).
Make sure that the gas pipe work does not
contain dirt, particularly with new pipes.
6.5 Hot water supply E-SHR 24T and 35T
The ATAG Premier E-SHR 24T and 35T are fitted with a
stainless steel plate 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
sanitary water flowing through the plate heat exchanger
up to 63°C instantanious.
The water mains installation must comply with the water
BYE-laws.
In regions with a water hardness value higher
than 15°D, 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.
The hardness of the water is variable in the United
Kingdom and Ireland. The water company can provide
exact information about this.
The cold and hot water pipes can be connected to the
installation by means of compression fittings.
The cold water inlet on the E-SHR-T boilers must be
provided with the following (counted in the water flow
direction):
- Safety group;
- Expansion vessel for potable water, 6 bar (blue)
6.3 Underfloor heating system (plastic pipes)
When connecting or using an underfloor heating system,
designed with plastic pipes, or plastic pipes are used
elsewhere in the installation, one should ensure that the
plastic pipes used comply with the DIN 4726/4729
standard. It is set out in this standard that the pipes may
not have oxygen permeability higher than 0.1 g/m³.d at
40°C. If the system does not comply with this DIN
standard, the underfloor heating component will have to
be separated from the central heating boiler by means of
a plate exchanger.
No recourse can be made to the terms of the
warranty in the event of failure to observe the
regulations pertaining to plastic underfloor
heating pipes.
choice of expansion vessel
table 4
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