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Relay Output #4 Programming ( Used for Boiler #3 )
The third boiler stage is enabled to operate if the water temperature is below 160°F and
will remain on until it rises to 175°F. The third stage can only operate if the second boiler
stage relay #3 has been active for at least 5 minutes. Once activated, this stage must
remain on for 5 minutes and once de-activated it must remain off for 10 minutes.