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Viessmann Vitodens 100W boiler
2 - zone heating
2 -grundfos 15-58 pumps
1- 3 way manual mixing vavle
Hooneywell R8239D controller
Originally the boiler was running one zone with the controls hooked up to the boiler PPM. The solenoid valve was placed in the open manual position.
Recently a second zone was added. The primary pump is controlled by the boiler and the second pump feeds both zones.
When the zones are satisfied and the SV close the primary pump continues to run for the default set time, however the boiler pressure increases from approx 20lbs toas high as 30lbs. It has also activated the PRV. I assume this is abnormal, and not having much experience with boilers, any thoughts as to why this increase in pressure.