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2.04 Central heating adjustment (not normally required)
To adjust boiler heat input (thus also regulating heat output to the central heating water) simply adjust the main
burner via the electronic control board (fig. 4, 5 and see paragraph 5.04 page 24).
The diagrams indicate the variation in heat output to the water as burner working pressure is varied.
Adjusting boiler output to the actual requirements of the central heating system will minimise boiler cycling thus
saving fuel, varying the output has virtually no effect on the efficiency and combustion characteristics of the boiler.
Diagram of pressures
and outputs with Natural gas
14
13
12
11
10
9
8
7
6
5
4
3
2
12 13 14 15 16 17 18 19 20 21 22 23 24
kW
kcal/h
11 12 13 14 15 16 17 18 19 20 21
x 1000
Fig. 4
2.05 Pump characteristics
The pump head available for circulating the water is
given in fig. 6.
N.B. - The pump is factory set at position 3. The pump
is a Grundfos type 15-50 UPS series.
Grundfos Pump performance graph
Note - Minimum flow through boiler heat exchanger at
any time should not fall below 6 litres per minute.
If the total volume of water in the system exceeds 40
litres an additional expansion vessel must be fitted to
the central heating return pipe.
Pump performance curve Grundfos UPS 15-50
1 2 3 Speed settings
A
Boilers pressure drop
B
Available pump head C.H.
DOMINA 102 DGT
25 26 27 28 29 30 31
kW
kcal/h
22 23 24 25 26
X 1000
Diagram of pressures and outputs
with LPG (Propane)
35
30
25
20
15
10
5
12 13 14 15 16 17
18 19 20 21 22 23
11 12 13 14
15 16 17
24
25 26 27 28 29 30
18 19 20
21
22 23 24
25 26
Fig. 5
Fig. 6
7
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