OK, I had the furnace tech stop back and added a relay and rewired furnace blower to run at a slower speed (same speed as when furnace normally runs) only when the HRV is on. Everything went well, except now the HRV has been running constantly for 1 1/2 days and it will not get the humidity below 45% in the house. The HRV is a 200cfm unit on high speed and the house is 2000sq ft plus the basement. What could the issue be? I need some info so I can tell the HVAC people.