9
3
Solar connections
A solar thermal system consists of several components selected to work together to convert solar energy into hot water for various
applications. A controller is used to turn on a pump when the fluid in the solar collectors is warmer than the water in the Strato-
Therm+ tank. The pump will transport hot fluid from the collector to the heat exchanger and replace it with cooler fluid returning.
The collectors, pump station and heat exchanger are connected with supply and return piping that is insulated to minimize heat
losses (FIG. 3-1, page 10). The system is equipped with over-temperature and over-pressure devices that prevent unsafe operating
conditions. When multiple heat exchangers are used, they should connected in reverse-return arrangement (FIG. 3-2, page 10). This
will help ensure that solar heated water is distributed evenly between the heat exchangers. Pressure drop and maximum operating
values for the Strato-Therm+ spherical heat exchanger are listed in Tables 3A - 3C.
Installation and commissioning must be carried out by a licensed contractor. Take appropriate safety measures when carrying
out any installation work on the roof and observe all relevant accident prevention regulations. It is the installer’s responsibility to
comply with the building and installation codes in effect and all regulations that apply to the operation of a solar hot water system.
Table 3B
Spherical Maximum Operating
Conditions
Copper Heat
Exchanger
Tank
Temperature
230°F
230°F
Pressure
145 psi
125 psi
Table 3C
Spherical Heat Exchanger Pressure Drop Chart
0
5
10
15
20
25
30
0
2
4
6
8
10
12
14
Pressu
re Drop,
ps
i
Flow Rate, gpm
STU150
STU200 /
SHX40000
STU257
STU350 /
SHX40001
STU423
STU504 /
SHX40002
STU650
STU752 /
SHX40003
STU940 /
SHX40004
Installation & Operation Manual
Table 3A
Spherical Heat Exchanger
Pressure Drop Values
MODEL
SPHERICAL
MODEL
PRESSURE DROP PSI)
1
GPM
2
GPM
4
GPM
6
GPM
8
GPM
10
GPM
12
GPM
14
GPM
STU150
SHX40000
0.20
0.68
2.29
4.66
7.71
11.39 15.67 20.52
STU200
STU257
SHX40001
0.24
0.81
2.71
5.52
9.13
13.49 18.56 24.31
STU350
STU423
SHX40002
0.07
0.23
0.78
1.59
2.64
3.90
5.36
7.02
STU504
STU650
SHX40003
0.03
0.09
0.30
0.61
1.01
1.50
2.06
2.70
STU752
STU940
SHX40004
0.03
0.09
0.30
0.61
1.01
1.50
2.06
2.70
