Pag. 30 di 69
4.5 PUMP UNIT
Pump type:
CLAS X SYSTEM 15 CF NG (RU)
CLAS X SYSTEM 15 FF NG (RU)
CLAS X SYSTEM 24 CF NG (RU)
CLAS X SYSTEM 24 FF NG (RU)
CLAS X SYSTEM 32 FF NG (RU)
CLAS X SYSTEM 24 FF NG (CI)
CLAS X SYSTEM 28 FF NG (CI)
CLAS X SYSTEM 32 FF NG (CI)
The P.C.B. controls modulation of the circulation pump at two different speeds V2 and V3 :
On “sanitary” the pump always works on V.3 to allow excellent heat exchange
On “heating” the circulating device has 2 speeds that are operated by the heating del-ret ΔT control.
Operated as follows:
ΔTdel-ret < ΔT – 2°C → V2;
ΔTdel-ret > ΔT → V3;
where: ΔT= 20°C (default value, which can be set by parameter 2 39 between 10 and 30°C).
Speed switching is performed with a 5 minute delay (value that cannot be set) up or down.
It is possible to exclude the pump modulation with the parameter 2 38:
- 0: speed 2 fix;
- 1: speed 3 fix;
- 2: modulating.
The antisticking function switch on the pump and 3 way valve for 15 sec avery 21 h after the last request.
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