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Boiler Piping Diagram – Primary/Secondary Option 2
Note: The above illustrates one possible method of connecting the SF170/SF270 bolers with an existing boiler.
This connection is as follows: using a small circulator (and with the backup boiler piped into the return
tapping) run another pipe from the supply tapping T, of the Legacy Stoves boiler to the supply line, of the
existing boiler on the lower side of the flow control valve. A minimum of 1'' diameter pipe should be used for
this connection on the model SF170. Use 1 1/4" pipe to make this connection on the SF270. The pipe size must
be determined by taking into account the distance involved and flow required. The new circulator should be
wired to the power for the Legacy Stoves boiler. When power to the Legacy Stoves boiler is on, the circulator
should be running. The add-on boiler shall be installed without interfering with the normal delivery of heated
water from the original boiler. The add-on boiler shall be installed without affecting the operation of the
electrical and mechanical safety controls of the original boiler.
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