Working knowledge or hands-on experience in maintenance, operation, and repair of steam boilers, electricity and electrical distribution systems, plumbing and piping systems, internal combustion engines, pumps, air compressors, generators, ice machines, air-conditioning units, chillers (centrifugal and screw type), cooling towers, air handling units, variable frequency drives, and building automation systems (pneumatic and direct digital control). Experience in ordering supplies, work order management systems, and proficiency in Word and Excel (ability to maintain complex spreadsheets).