Old Lennox Wiring Diagrams - where to find? Sep 08, 2008My church has an old Lennox HP17-953 heat pump split system that the wiring diagram is missing from. It has a two speed compressor that someone in the past has pulled and taped off the coil wire on one of the two compressor contactors. When I reconnect the coil wire it runs for about 30 seconds before something trips it off. A wiring diagram would be great but of course it is long gone.