DOMESTIC HEATING AND HOT WATER
EXPANSION VESSEL AND SYSTEM REQUIREMENTS
Safety Valve Setting
3 bar
Initial System Pressure
0.5 bar
1.0 bar
1.5 bar
Total Water Content of System
TOTAL VESSEL VOLUME **
Litres
Litres
Litres
Litres
25
2.1
2.7
3.9
50
4.2
5.4
7.8
75
6.3
8.2
11.7
100
8.3
10.9
15.6
125
10.4
13.6
19.5
150
12.5
->[16.3]<-
23.4
175
14.7
19.1
27.2
200
16.7
21.8
31.2
225
18.7
24.5
35.1
250
20.8
27.2
39.0
FOR FURTHER INFORMATION CONSULT APPROPRIATE TRAINING MANUALS
AND BS 7074 PART 1, BS 5449, ETC
* * When calculating size of any additional expansion vessel required, remember to deduct
the boiler expansion vessel volume of 10 litres from the calculated
total system vessel volume required, as given in above table.
EXAMPLE: using above table
If ............................Total water content of system
-
150 litres
And ....................Initial system pressure required is
-
1.0 bar
Then ..................Vessel volume required [from above table] -
16.3 litres
But ......................Vessel supplied with boiler
-
10.0 litres
Therefore ....Additional vessel required
-
6.3 litres (minimum)
(For this system of 150 litres - total water volume)
..Nearest available stock size for additional vessel required, at 1 bar initial system pressure
(taken from above table) is 8 Litres.
It is emphasised that the installer should be fully acquainted with sealed system installation and
operation, calculation of total system water volume, determining of initial system pressure
required and calculation of any additional expansion vessel volume required.
NB .. Ensue that all expansion vessels in the same system are set at EQUAL air charge pressures.
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Summary of Contents for Combi 120
Page 10: ...2 TECHNICAL SPECIFICATION 9 2 E F Riello Burner Specification...
Page 31: ...30...
Page 32: ...Combi Oil Boiler PART 2 Sealed System Domestic Hot Water 31...
Page 40: ...39 Combi Oil Boiler PART 3 Spare Parts...
Page 41: ...9 FAULT FINDING 40 T Repair or Replace Oil Pump r No...
Page 52: ...NOTES...
