Sr, senior, Service Tech, refridgeration, HVAC, refrigeration, HVAC-R, HVAC/R, diagnostic, commercial, service, install, mechanical, mechanic, apprentice, AC, field service, chiller, specialist, HVACR, supermarket, rack systems . Employees are regularly required to walk and stand for long periods, hear, drive, sit, bend, kneel, stoop, crouch, crawl, climb, use hands and fingers, and lift and/or move up to 25 pounds, occasionally up to 50 pounds.