Models RLC-900 and RLC-1800 have water fittings on the front and back to ease use. Whether the rack-mounted chillers are located internally or externally, the user can access water inlet and outlet hoses from either end of the chiller. This can help save space while making the chiller easier to use. The chillers include a pulse-width-modulating (PWM) controller that includes fan speed control. This allows the chillers to slow the fan automatically, reducing noise, as the unit reaches its setpoint. Four independent PID settings allow for different temperature ranges.