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Drainback enabled, but no drainback tank?
I'm trying to understand how our solar water heater is set up, and whether it was setup wrong.
It has been going for 7 years, has not frozen, and seems to help, though our boiler contractor said he was surprised how often we were calling for backup DHW heat when we have solar.
I looked at the settings on the control (sungo us plus) and it is set for drainback.
We have an Intertek SGL-2 350 tank with two heat exchanger loops. Top exchanger is 9 sq ft for the boiler, bottom is 12 sq ft for the solar.
The proposal lists "propylene glycol head exchange loop"
Are drainback settings ever supposed to be used with a heat exchanger?
If not, should I set the controller to the default values?
How often do we need to flush and replace the coolant? It has never been done.