Tech replaced 14*20 filter. Did not have 14*30 or 12*12 filter. Tech inspected system per ESA. Found manifold pressure very low for propane at 4.5” WC. Joy confirmed 125 oriface is correct for propane. Gas valve adjustment is front seated and pressure is too low. Tech attempted to remove and adjust gas valve spring, but plastic set screw is stuck in valve. Tech was able to adjust high and low stage propane regulators to get inlet gas pressure from 6” WC up to 12.6” WC into gas valve, but even with gas valve adjustment front seated, manifold pressure will not rise above 4.5” WC to burners. System is heating, but tech recommends ordering LP conversion kit including propane spring and gas valve to ensure system gets correct propane pressure to burners. Need to check on conversion kit and call to quote price. There is no disconnect next to unit. Unit is straight wired behind panel next to unit. Tech turned off 50 amp breaker in laundry room to service gas pack. This is a safety hazard. T