and 10 to minimize corrosion and glycol oxida-
tion in the piping system.
4.14 Flushing and Charging the System
Once the components are plumbed you are
ready to fill the solar storage tank with water
and to charge the collector loop with a mixture
of heat transfer fluid (HTF) and water. Due to
variations in municipal water quality through-
out the country, distilled or deionized water
shall be used to mix with the propylene glycol
HTF.
Proceed as follows:
4.14.1
STEP 1
- fill the solar tank with water
and check that there are no leaks on the potable
side of the system.
Do this by opening the cold water isolation ball
valve to the solar tank (COMPONENT #23,
FIGURES 15A; 15B; 16A; 16B; 17A; 17B )
and opening a hot water outlet, such as a faucet,
until the water runs freely. When the tank is
filled, inspect all threaded connections and sol-
der joints for leaks.
4.14.2
STEP 2
- Thoroughly flush all impuri-
ties out of the collector loop and check collector
loop for leaks.
Begin by connecting a washing machine type
hose to the upper charge valve (COMPONENT
P.18
1
3
7
3
8
9
10
11
13
14
15
16
4
6
5
17
18
19
20
21
22
32
23
FEED
RETURN
HOT SUPPLY LINE
TO FIXTURES
COLD SUPPLY
LINE
3
PIPE INSULATION
ROOF JACKS
1. SunEarth Solar Collector
(s)
2. Collector Sensor
3. Option Tank and Line
Thermometers
4. Check Valve
5. Isolation Ball Valve
6. Pressure Relief Valve
7. Pressure Gauge
8. Expansion Tank
9. Charge Valve
10. Isolation Ball Valve
11. Drain/Purge Valve
12. Isolation Ball Valve
13. Circulating Pump
14. Isolation Ball Valve
15. Flush Valve
16. Tank Sensor
17. Cold Water Dip Tube
18. Differential Temperature
Controller
19. Heat Exchanger
20. Anode Rod
21. Heating Element & Tank
Thermostat
22. Temperature and Pres-
sure Relief Valve
23. Cold Water Supply Line
Isolation Ball Valve
32. Mixing Valve
33. Optional Time Switch
2
T2
T1
12
SINGLE TANK SYSTEM SCHEMATIC
fig. 15a
