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
