18 HT25 - CONTROLS DESCRIPTIONS This optional knob adjusts heater temperature. This gauge, located under seat, records engine operating time. Use these times to schedule lubrication and maintenance. Use this optional knob, located under seat, to disconnect battery when servicing unit or during long- term storage. Heater Temperature Control Turn clockwise for warmer. Turn counterclockwise for cooler. Turn clockwise to connect battery power. Turn counterclockwise to disconnect battery power. p Battery Disconnect Hourmeter