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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need.
The N should be line neutral, L =line. And the LT and LTL should be your thermostat connections. However, if you can locate and upload a wiring diagram off the inside of the unit to the site here, that will help me.