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Installation instructions S-HR series page 9
As standard the boiler is provided with a water filter in the
return pipe of the boiler. With this, possible contamination
of the central heating water is prevented from ending up
in the boiler. The boiler is also provided with an internal
safety valve set at 3 bar. This is connected to the waste
discharge together with the condensation discharge.
If all, or a large part of the radiators are provided
with thermostatic radiator valves it is advisable to
use a pressure difference control (bypass) in order
to prevent flow problems in the installation.
The boiler is designed to be used on sealed
system only.
Additives in the installation water are only
permitted in consultation with the country
distributor.
When using more than one boiler in an installation
please refer to the cascade installation instructions.
6.2 Expansion vessel
All ATAG Blauwe Engel S-HR-24T and 35T boilers are
provided with an expansion vessel on top of the cylinder.
This expansion vessel is connected to the three-way valve
and the circulation pump. By this means the expansion
water, when functioning for the hot water supply, is
prevented from being shut off from the expansion vessel
when the radiator thermostat valves are fully closed. The
ATAG Blauwe Engel S-HR 51T is provided with a
expansion vessel connection. The expansion vessel of
correct size must be connected to this pipe. A second
expansion vessel in the installation is not a problem.
The ATAG Blauwe Engel S-HR boilers are not equipped
with an expansion vessel connection. If a S-HR boiler is
combined with an Comfort cylinder, the expansion vessel
connection is included in the internal piping of the Comfort
cylinder, to which the expansion vessel can be connected.
If a different cylinder is used then one has to take into
account that the expansion vessel should be connected
between the three-way valve and the boiler circulation
pump.
In connection with correct functioning of the
boiler it is necessary for the expansion vessel
to be connected to the expansion vessel pipe
of the boiler.
The expansion vessel which is used should be geared
to the water content of the installation. The pre-charge
pressure depends on the installation height above the
mounted expansion vessel.
external installation pump with low velocity header figure 4
choice of expansion vessel table 4
evobathgiehnoitallatsni
lessevnoisnapxeeht
erusserpegrahc-erp
lessevnoisnapxeehtfo
m5rab5,0
m01rab0,1
m51rab5,1
The ATAG S-HR24 and S-HR35 boilers can be provided
with an expansion vessel module. By this means the
external expansion vessel is cancelled. This expansion
vessel module is placed behind the S-HR boiler, by which
means the expansion vessel is not noticeable. If the S-HR
boiler is provided with a ATAG Comfort cylinder the overall
depth will be equal. The content of the two expansion
vessels is 20 litres. The pre-charge pressure is 1 bar.
The expansion vessel module can be supplied with the
necessary pipes to connect with the S-HR boiler. The
connecting pipes for the installation correspond with
those of the boiler and have the same centre-to-centre
distance to the wall. When checking the expansion
vessels these are accessible via the left, right and upper
sides. From these sides the tanks are also removable
and the boiler does not have to be dismantled.
9


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