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
Thermal-Stor tank plus the differential. 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 should be connected with supply and return piping
that is insulated to minimize heat losses (FIG. 3-1, page 10). The system should be equipped with over-temperature and over-
pressure devices that prevent unsafe operating conditions. When multiple Thermal-Stor tanks are used, they should be 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 Thermal-Stor 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
TSU150-200 /
SHX40000
TSU257-350 /
SHX40001
TSU423-504 /
SHX40002
TSU650-940 /
SHX40003
SHX40004
0
5
10
15
20
25
30
0 gpm
2 gpm
4 gpm
6 gpm
8 gpm
10 gpm
12 gpm
14 gpm
PRESSURE DROP
, PSI
FLOW RATE, GPM
30
25
20
15
10
5
0
0
2
4
6
8
10
12
14
TSU257-350/
SHX40001
TSU150-200/
SHX40000
TSU423-504/
SHX40002
TSU650-940/
SHX40003
SHX40004
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
TSU150
SHX40000
0.20
0.68
2.29
4.66
7.71
11.39 15.67 20.52
TSU200
TSU257
SHX40001
0.24
0.81
2.71
5.52
9.13
13.49 18.56 24.31
TSU350
TSU423
SHX40002
0.07
0.23
0.78
1.59
2.64
3.90
5.36
7.02
TSU504
TSU650
SHX40003
0.03
0.09
0.30
0.61
1.01
1.50
2.06
2.70
TSU752
TSU940
SHX40004
0.03
0.09
0.30
0.61
1.01
1.50
2.06
2.70
Installation & Operation Manual
