HTP SSU-119SE - Manual (Page 22)

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LP-199 REV. 4.15.14
H. SOLAR WATER HEATER WITH ELECTRIC BACK-UP
Figure 8 – Solar Water Heater with Electric Back-up
FIGURE NOTES:
1. This drawing is meant to show system piping concept only. The installer is responsible for all equipment and detailing by local codes.
2. Antifreeze, non-potable HTF shall be used for the solar heat exchanger circuit only. Never introduce antifreeze solution to any connection other than
the solar loop.
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 cold water inlet of the solar water heater.
4.
An ASSE 1017 mixing valve is required per SRCC OG-300.
5. A minimum of 12 diameters of straight pipe must be installed upstream of all circulators.
6. For all SE models: Make sure tank is fully purged of air before power is turned on to the backup heat source.
7. Circulators shown in the above hydronic piping should have an integral flow check or alternately use a stock pump with an external spring type check
valve. (Due to extreme temperatures, circulators with integral flow checks are not to be used in solar systems. If circulator comes equipped
with an integral flow check, remove it.)