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 TABLE 5-5: Fluid Pressure for Closed Loops
Extrol Max.
Fluid Pressure, PSI at Fluid Temperatures of:
Tank(s) System
Model # Volume
40F 60F 80F 100F 120F 140F 160F
(Gal.)
1x15
32
33
34
35
36
37
38
4.7
2x15
9.4
32
33
34
35
36
37
38
12.5
35
37
39
40
1 x30
33
34
35
17.2
15+30
33
34
35
36
37
38
40
25.0
2x30
33
34
35
36
37
39
40
44.5
1 x90
33
34
36
37
38
40
42
56.0
30+90
33
34
35
37
38
39
41
2x90
88.0
33
34
36
37
38
40
41
3x90
132.0
33
34
36
37
38
40
41
Note: This chart is based upon sea level pressure. Add one-half pound to
the fill pressure and expansion tank air pressure for every 1000 feet the site
is above sea level.
In all cases, the expansion tank air pressure, measured with no fluid pressure, is 30
PSI at sea level. Add one-half PSI to the listed air pressure and system fill pressure
for every 1000 feet the system is above sea level.
5.2.7 Solar Controls,
Sensor Wires
Damaged or incorrectly routed sensor wires should be replaced with multi-strand,
twisted pair wire of 18 to 22 gauge. Aluminum wire can be used for runs of up to
500 feet. Above that distance, copper should be used.
Although the twisted pair design will reduce interference from electrical "noise" from
other circuits, it must still be at least two feet from other conductors, controls and
loads such as motors. Where it is necessary to cross other wires, do so at a right
angle to minimize induced current (Figure 5-32).
REPAIR
5.2 REPAIR PROCEDURES
187
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