23
Boiler Safety Valve Setting (Bar) 3
Vessel Charge (Bar) 0.5 1 1.5
Heating System Water Content (Litres) Expansion Vessel Size (Litres)
100 8
125 10.4 13.6 19.5
150 12.5 16.4 23.4
175 14.6 19.1 27.3
200 16.7 21.8 31.2
225 18.7 24.5 35.1
250 20.8 27.3 39
275 22.9 30 42.9
300 25 32.7 46.8
Table 04 Expansion Vessel Size
4.6.5 Circulation pump
The Remeha Selecta is equipped with a Grundfos UPR 15-50 A0S1 circulation pump.
This pump has a manual switch to select one of the three speed positions (see Fig. 13).
If boiler parameter L/18 is set to 0 (see Table 09, service level), but will be overrid-
den by the boiler control to III when in DHW mode and in the HTG mode if the boiler
parameter L/18 is set to 1 (see Table 09, service level):
- highest setting during DHW operation
- during CH operation in its manual adjustable setting (to be set in the control unit by
the installer, see Par. 9.2.3)
- if the middle position is required during CH operation, change the position switch on
the pump and
change parameter L/18 (see Table 09) to; manual adjustable = 0.
The residual head, is the head available for the installation, after deducting the boiler
resistance, see Fig. 13.
Note: The standard pump overrun time is 3 minutes. If so desired, this can be adjust-
ed to a different value (see Par. 9.2.3)
Fig. 13 Residual head Grundfos
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