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Boiler Help Please

Henrynagel Member Posts: 1
I have installed an IBC HC-33-160 boiler and basically I am having problems keeping just the boiler pressure up when the system is not calling for heat. The system pressure is staying up just fine its just the boiler pressure that drops. As soon as the pumps kick on and start calling for heat then the boiler pressure goes back to normal operating pressure, and as soon as everything is to temp the pressure in the boiler slowly drops. I have bled the system and the all 4 zones (3 heating and an indirect fire water heater) but I am still having the same problem. My original though was that I had air in the system that was slowly causing the pressure to drop but it doesn't matter how much I bleed it the problem doesn't go away.