2ND CLEAN AND CHECK FOR HEATING SYSTEM. CLEAN AND CHECK BURNERS AND BURNER OPERATION. ADJUST BLOWER COMPONENTS, LUBRICATE ALL NECESSARY MOVING PARTS. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK THERMOSTAT, AIR FILTER, HEAT EXCHANGER, HIGH LIMIT CONTROL, HUMIDIFIER, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS.