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This document describes the operation of Lennox thermostat. 51M33. Refer to the installation manual for instructions re- garding installation and wiring of This document describes the operation of Lennox thermostat. 51M37. Refer to the installation manual for instructions re- garding installation and wiring of List of available manuals, guides and instructions for Lennox 51M33 Merit non-programmable digital thermostat. This document describes the operation of the Lennox model. L3532H thermostat. Refer to the installation manual for instructions regarding installation andThis document describes the operation of the Lennox model. L3021H thermostat. Refer to the installation manual for instructions regarding installation and Lennox 51M33 - Non-programmable 2H/1C Heat Pump Thermostat - Non-programmable 2H/1C Heat Pump Thermostat. MANUALS (1). User Guide. Refer to the installation manual for instructions regarding installation and Thermostat The Lennox Merit® Series Thermostat 51M33 is a nonprogrammable E2018 Lennox Industries Inc. THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER manual. Do not install the thermostat on outside walls (where there is. Find Lennox Commercial HVAC product service manuals, installation guides, engineering handbooks, application and design guidelines.