Furnace start up. LP was just turned on and checked by utility company. I checked for any gas leaks with gas sniffer. No leaks found. Cycled system several times to get gas through valve. Checked incoming and outgoing gas pressures. Adjusted pressures to maximize efficiency. Checked electrical connections and clamps. Checked for levels of CO and XS air in exhaust, normal levels found. No CO found in airstream. System operating normal at this time. Job complete.