User manual ATAG iC, iS and iR-Range
11
Boiler frost protection
If the (T1) flow sensor registers a temperature of 5°C or below in the boiler, the boiler will
fire up. The boiler keeps on firing until the temperature reaches 10°C (measured on the
flow sensor) and the boiler switches off again.
5 Filling the heating system
Information on the water pressure (only iC and iS)
Information of the actual water pressure:
The
controller Home screen shows OK. The actual water
pressure is always visible.
Water pressure is too low (<0.8 bar):
Power is reduced by 20%. The installation should be refilled.
Water pressure is too low (<0.5 bar):
The boiler is taken out of operation. The installation should be
refilled.
Air purge program:
After the installation has been refilled and if the pressure was
below 0.5 bar the air purge program will start. This will last for
approximately 7 minutes.
Water pressure is too high (> 3.0 bar):
The boiler is taken out of operation.
The installation pressure should be reduced by draining water
from the heating system.
The central heating installation needs to be filled with potable water according to the
requirements in chapter 9.3 'Water quality' in the Installation manual. For filling or topping
up the installation use the filling loop according to the following procedure (see figure 1).
