U.L. Recognized – Guide SEOT2, file SA4093 for use in air conditioning equipment. C.S.A. Certified – Guide 165-E-90, file 016386-0-000 for use in air conditioning equipment.
Crankcase heaters are used to overcome the problem of migration and condensation of refrigerant in the crankcases of compressors used in air conditioning and heat pump systems. They are designed to keep the crankcase oil at a temperature higher than the coldest part of the system to prevent migration.
The following list Backer Hotwatt Crankcase Heaters by the OEM manufacturer. In addition, custom designed crankcase heaters and variations to the units shown are also available.