TURBOMAX Use and Care Manual with Installation Instructions July 2014 Page
36
Table 7: Expansion Tank Sizing
Lower system temperature
Higher system temperature
Minimum operating pressure at tank
Maximum operating pressure at tank
Volume
Volume of Diaphragm
Volume of Diaphragm
Volume of Diaphragm
of water
in system
if Copper
if Steel
if Copper
if Steel
if Copper
if Steel
in US gallons
Piping
Piping
Piping
Piping
Piping
Piping
10
0.7
0.7
1.0
1.0
1.6
1.6
20
1.3
1.4
2.0
2.1
3.1
3.2
30
2.0
2.1
3.0
3.1
4.7
4.9
40
2.7
2.8
4.0
4.2
6.3
6.5
50
3.3
3.5
5.0
5.2
7.8
8.1
60
4.0
4.2
6.0
6.3
9.4
9.7
70
4.7
4.9
7.1
7.3
10.9
11.3
80
5.3
5.6
8.1
8.4
12.5
13.0
90
6.0
6.3
9.1
9.4
14.1
14.6
100
6.7
7.0
10.1
10.5
15.6
16.2
120
8.0
8.4
12.1
12.6
18.8
19.4
140
9.3
9.8
14.1
14.7
21.9
22.7
160
10.7
11.1
16.1
16.8
25.0
25.9
180
12.0
12.5
18.1
18.9
28.1
29.2
200
13.4
13.9
20.1
21.0
31.3
32.4
220
14.7
15.3
22.2
23.0
34.4
35.6
240
16.0
16.7
24.2
25.1
37.5
38.9
260
17.4
18.1
26.2
27.2
40.6
42.1
280
18.7
19.5
28.2
29.3
43.8
45.4
300
20.0
20.9
30.2
31.4
46.9
48.6
320
21.4
22.3
32.2
33.5
50.0
51.9
340
22.7
23.7
34.2
35.6
53.2
55.1
360
24.0
25.1
36.3
37.7
56.3
58.3
380
25.4
26.5
38.3
39.8
59.4
61.6
400
26.7
27.9
40.3
41.9
62.5
64.8
420
28.0
29.3
42.3
44.0
65.7
68.1
440
29.4
30.7
44.3
46.1
68.8
71.3
460
30.7
32.0
46.3
48.2
71.9
74.5
480
32.0
33.4
48.4
50.3
75.0
77.8
500
33.4
34.8
50.4
52.4
78.2
81.0
550
36.7
38.3
55.4
57.6
86.0
89.1
600
40.1
41.8
60.4
62.9
93.8
97.2
650
43.4
45.3
65.5
68.1
101.6
105.3
700
46.7
48.8
70.5
73.3
109.4
113.4
Note:
= At fill conditions
= Hi-limit control set point
= PRV minimum setting
= Safety relief valve pressure
Lower system temperature
Higher system temperature
Minimum operating pressure at tank
Maximum operating pressure at tank
Tank (in US gallons)
Tank (in US gallons)
Tank (in US gallons)
50 °F
220 °F
18. psig
30. psig
50 °F
200 °F
15. psig
30. psig
50 °F
180 °F
12. psig
30. psig
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