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A7. Indirect Application Only with RTC – NO Building Heat (MECHANICAL)
NOTES:
1) Install the boiler as indicated above for systems where the boiler return temperatures may be less than 135F and heating DHW with an indirect water
heater or heat exchanger.
2) The boiler circulator must be sized using the sizing charts found in Appendix B.
3) The return sensor, S1, shall be installed at the return of the boiler. The boiler circulator may be located anywhere within the recirculation loop.
4) The balancing valve in the boiler return line, V1, may be necessary in low head by-pass loop applications.
5) The indirect heater aquastat (A1) is a normally closed switch. Circuit breaks on temperature rise.
6) Expansion tanks, air scoops and other components left out for clarity.
7) Observe all applicable plumbing and electrical codes.
This diagram is for reference only. The installer or designer is responsible for the proper selection and design of the
system.