Hitachi YUTAKI S80 Series Technical Catalogue page 106

9. Refrigerant and water piping
2 Check the pump performance curves
Refer to the Pump Performance Curves (see next chapter Pressure charts) to calculate the circuit's Water Flow depending
on the actual Pressure Drop and the Space heating type (Heating Floor, Radiators, Fan Coils).
3 Selection of the pump speed
The indoor unit pump should be adjusted according to Pressure Lost of the circuits and the calculated Water Flow. The
pump speed selector switch is located on the pump's Terminal Box.
N O T E
The Pumps are factory supplied on speed 3 (High)
4 Water flow adjustment
The Water Flow should be adjusted by closing
llation until the pressure matches the Pump Performance Curves.
Finally, the differential Manometer should be removed once the Water Pressure Ports are closed.
106
TCGB0075 rev.0 - 11/2012
View from A
Pump speed selector
one of the main Shut-off Valves (field supplied) of the Space heating insta-
Speed indications:
Speed 1 (Low)
Speed 2 (Medium)
Speed 3 (High)