Nature's Comfort SM-H60 Installation Manual - page 5
Summer Use
• For operation when not firing your outdoor boiler, a sidearm HX must be used and utility energy must be turned on
for the domestic hot water (DHW) in case of too much demand or not enough sunlight. You must also add a cord
end to the aquastat for the boiler pump that must be set to run when the boiler water jacket is 10 degrees or more
above the DHW set point and shuts off when it falls to 5 degrees above the DHW set point so utility energy is not
used to reverse-heat the boiler. See diagram later in this manual. Lower the set point of your DHW to utilize your
solar water heater as much as possible. Make sure to bypass all other heat exchangers in the boiler line so all energy
is used only for heating DHW.
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from Nature’s Comfort LLC, 3790 N SR 5, Shipshewana, IN 46565