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VELUX water heating system with tankless back-up
System models:
2.
Cold water
Hot water
12.
9.
Notes:
1.
This drawing is meant to show a system piping concept only. The installer is responsible for all equipment and detailing by local codes.
2.
Anti-freeze, non- potable heat transfer fluid shall be used for the solar storage tank heat exchanger circuit only. Never introduce Anti-freeze solution to any
other solar storage tank connection other than the solar heat exchanger.
3.
If there is a check valve on the cold water feed line, a thermal expansion tank suitable for potable water must be sized and installed within this piping system
between the check valve and the cold water inlet of the solar storage tank.
4.
The anti-scald mixing valve provided must always be installed as shown.
5.
For all electric back-up models, make sure solar storage tank is fully purged of air before power is turned on to the back-up heat source.
CLI U12 SD0(W/L/F/P)118 AUX TLG
CLI U12 SK0(W/L/F/P)218 AUX TLG
CLI U12 SKO(W/L/F/P)318 AUX TLG
13.
13.
13.
10.
11.
1.
3.
4.
8.
6.
5.
Heated glycol
4.
Cooled glycol
Part 3: Solar water heater system installation – 9
1. Collectors
2. Flashing/racking
3. Connector tube
4. Flextubes
5. Air Separator
4.
6. Pump station/controller
7. Expansion tank
8. Solar storage tank
9. Anti-scald mixing valve
(set at 120°F)
10. Diverting valve
(set at 130°F)
7.
11. Temperature sensor
12. Tankless water heater
13. Solar system bypass valves
4.
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