Just had my biomax plumbed in and getting ready for the first burn but want to make sure its purged properly. I purged all zones. Then filled the wood boiler, leaving open the valve to purge. But only a trickle of water comes out. In the other zones I got great flow. Now I continued to run the water and the pressure relief valve opens on the oil boiler at about 23 psi. Again never really getting good flow of water out of the woody. I wondering if it is filled propery with the air out. Anyone have experience with this? Thanks.