How To - Prioritize Zones
How to Prioritize Heat Zones on your HUG Hydronics System?
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You may choose thermostat zone 4 to be a low priority so it will only heat after others are warm.
Connect that thermostat wire to be zone 4 and put a jumper on the “Low Priority” pins. If Zone 4 is in low priority mode and is calling for heat while any other zone is calling, then the “Zone 4” LED will glow dim yellow to indicate that it wants to heat now, but it is overridden.