Installation
|
37
6 720 643 068 (2011/06)
Copyright (optional information)
5.2
Comparing the size of the integrated
expansion vessel
The following diagrams allow verifying that the integrated
expansion vessel has sufficient capacity for the intended
application, or if an additional expansion vessel is needed
(not for radiant floor heating).
The following standard conditions were used:
•
Precharge volume 20% of the rated volume in the
expansion vessel
•
Differential to the safety valve of 7.25 psi (0.5 bar)
•
Precharge pressure of the expansion vessel equal to the
static system height above the boiler
•
Maximum operating pressure: 30 psi (2.07 bar)
Fig. 9
Operating capacity of the expansion vessel in °F and
gallons
Fig. 10 Operating capacity of the expansion vessel in °C
and liters
Key to Fig. 9 and Fig. 10:
I
Precharge pressure 7.25 psi (0.5 bar) (default setting)
II
Precharge pressure 10.9 psi (0.75 bar)
III
Precharge pressure 14.5 psi (1.0 bar)
t
V
Supply temperature in °F ( °C)
V
A
System capacity in gallons (liters)
A
Within operating capacity of the expansion vessel (left of the
relevant curve)
B
Additional expansion vessel required (right of the relevant
curve)
B
If results are borderline: Determine precise vessel sizes.
B
If the results are to the right of the curve: Install
additional expansion vessel.
200
80
100
120
140
160
180
0
20
40
80
100
120
60
t
V
/°F
V
A
/gal
6720641933-13.1O
A
B
I
III
II
90
30
40
50
60
70
80
0
75
150
300
375
450
225
t
V
/°C
V
A
/l
6720641933-27.1O
A
B
I
III
II
