Installation & Servicing Instructions ATAG Q-Series
10
If the installation resistance is higher than the stated value the pump will rotate at
maximum pump capacity and the load will be adjusted until an acceptable temperature
difference between ow and return water has been obtained. If, after this, the temperature
difference remains to much then the boiler will switch itself off and wait until an acceptable
temperature has arisen (DT 20°C).
If an unacceptable temperature is detected, then the control will repeatedly try to achieve
water ow, and if this does not work then the boiler will switch off.
If the capacity of the boiler pump is insufcient, an extra external pump can be installed
in combination with a low velocity header in series with the boiler. The electrical side of
this external circulation pump can be connected in the Control Tower, which means this
pump switches at the same times as the boiler pump.
The maximum absorbed current consumption of the external circulation pump may be
230 W (1 Amp). The extra external pump must be selected according the installation
resistance and required ow.
As standard the boiler is provided with a water lter 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 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 designed to be used on sealed system only.
Additives in the installation water are only permitted in consultation with the
country distributor. See chapter 6.5.
When using more than one boiler in an installation please refer to the cascade installation
instructions.
external installation pump
with low velocity header
gure 6.1.a
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