Manual for KHA/KHB - Troubleshooting and error codes + PDF Download

This Lennox KHA/KHB commercial heat pump service manual outlines the operational sequences for cooling and heating modes, including economizer and defrost operation. The unit operation is controlled by a thermostat, which dictates blower, compressor, reversing valve, and auxiliary heat functionality. For two-stage models, the operation includes low and high-speed blower and compressor stages to modulate capacity based on demand. Specific sequences are provided for different unit configurations and optional components like economizers and power exhaust fans.