SunEarth CASCADE 2, Инструкция по установке, эксплуатации и обслуживанию

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sensor (T1) and the solar tank sensor (T2) should be 4
ºF – 30ºF when the system is circulating.
12.4 Fluid Level
The water level when the system is not circulating
(pump stopped) should such that the drainback tank
not less than 75% full. When the system is circulating
(pump running); the water level in the drainback tank
should be not less than 25% full. The drainback tank
should never be pumped dry in normal operation as
this may result in damage to the circulator pump.