Lennox ML180UH - Manuals

Page 3 CAUTION Before attempting to perform any service or mainte-nance, turn the electrical power to unit OFF at thedisconnect switch. WARNING Do not set thermostat below 60°F (16°C) in heatingmode. Setting thermostat below 60°F (16°C) reducesthe number of heating cycles. Damage to the unitmay occu...

Page 4 and maintained. However, the unit’s performance can begreatly impacted by the individual installation and the op-erating environment. It is your responsibility to ensure thatthis appliance is maintained. Proper maintenance is criti-cal for your safety and the satisfactory operation of theprod...

Page 5 Filters All ML180UH filters are installed external to the unit. Fil-ters should be inspected monthly. Clean or replace the fil-ters when necessary to ensure proper furnace operation.Replacement filters must be rated for high velocity airflow.Table 1 lists recommended filter sizes.A filter mus...