21
Commissioning
9.4 Automatic detection of the presence of air - Vent system
Fig. 9.2
: Filling and venting of heating systems
Fill and bleed the system correctly. The circulator can be noisy at start due to the presence of
air. Such noise should stop after few minutes of operation. Usually the pump rotor chamber
normally bleeds automatically after a short time in operation.
The circulator is equipped with a special software system that detects the presence of excess
of air within the heating system. The LED shows the presence of air in the hydraulic circuit by
flashing and performing a rapid succession of WHITE colour.
Following the light signal, it’s possible to easily vent the heating system as follows:
1. Open the air vent valve in the hydraulic circuit above the circulator or open the cap of the air
separator in the pump housing, partially unscrewing it; when unscrewing the cap of the air
separator, beware of not losing the cap itself;
2. set the circulator to MAX position (maximum performance setting);
3. let the circulator run for a short period, according to the construction and the plant size;
4. once vented the system - the guide light (LED) stops blinking and the possible noise stops -
set the circulator as indicated in Par.10 Circulator setting
Repeat the procedure if necessary.
CAUTION
The plant cannot be drained by using the circulator.
With solar thermal systems, fill the system with mixtures prepared for that application. The
circulator cannot be used to mix the fluids in the system.
Do not touch the fluid or the circulator when the temperature is greater
than 60 °C. Hazard of scalding by simple contact.
1a
1b
2
3
10 min
