Installation & Servicing Instructions ATAG Q-Series
11
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.
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, by 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.
pump index lines graph 1
Q(m³/h)
100%
UPER 20-70
Q25C, Q38C
Q25S, Q38S
100%
UPER 20-60
H(m)
25%
UPER 20-60
25%
UPER 20-70
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 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 ow
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.
external installation pump
with low velocity header
gure 3
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