Installation & Servicing instructions ATAG A-Series
10
If the installation resistance is higher than the value stated, the control system will adjust
the load until a temperature difference between supply and return water is reached that
is acceptable for the control system.
When the temperature difference still remains too high the boiler will switch itself off
and wait until the high temperature differential between the ow and return water has
decreased again.
The control system will, if an unacceptable temperature difference is detected, repeatedly
try to establish a water ow. If this does not succeed, the boiler will block itself (c1 54).
If all, or a substantial part of the radiators have thermostatic radiator valves or if 2-port
zone valve are installed, an automatic by-pass valve must be used to prevent ow
rate problems. The automatic by-pass valve used should have the same diameter as
the connecting diameter of the supply and return pipe of the boiler. A decrease of pipe
diameter between boiler and by-pass is not allowed. See also Annex C.
The boiler is NOT equipped with a built-in internal lter.
Advice: ATAG Heating UK Ltd recommend the installation of an in-line lter
installed into the heating return as close to the boiler as possible. ATAG Heating
UK Ltd recommend the use of either:
Adey Magnaclean lters
or
Fernox TF1.
The boiler is not suitable for installations that are equipped with “open”
expansion tanks.
Additives in the installation water are only permitted in consultation with the
country distributor. See chapter 6.3 for detailed information.
6.2 Expansion vessel
The boiler is equiped with a built-in expansion vessel.
The A203C and A200S have a capacity of 8 litres with a pre-pressure charge 0.8 bar,
whilst the A325C, A325ECX and A320S have a capacity of 12 litres with a pre-pressure
charge of 1 bar. If the expansion vessel size is insufcient for the CH system, an additional
expansion must be installed. The additional expansion vessel should, together with
the built-in expansion vessel, be sized to the water content of the installation. The pre-
pressure charge depends on the height of the installation above the installed expansion
vessel. See Table 6.2.a.
The expansion vessel should be connected as closely as possible in the return
near the boiler.
expansion vessel table 6.2.a
installation height above
the expansion vessel
pre-charge pressure
of the expansion vessel
5 m 0,5 bar
10 m 1,0 bar
15 m 1,5 bar
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