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Indirect water heater getting airbound... looking for advice
This past weekend I had a Viessmann boiler and a Superstor indirect water heater (IWH) installed. The IWH is plumbed before the low loss header (LLH). As the LLH has the air vent on top of it, the circulation path of the water from the boiler to the IWH and back does not travel through the LLH, so any air cannot make its way out.
The IWH has become airbound three times now in 5 days. I purged the system of air each time, but it still continues to get airbound. I have attached a picture (pipes are not bent... I used a panoramic shot to take the picture as the boiler is on a wall 90 degrees to everything else), and drawn on the picture the flow of water for the IWH. Additionally, after a few days I can hear any in the boiler as well.
Any advice on how this can be fixed to eliminate the air in both the IHW and the boiler?
Thanks in advance,