Abstract: A component configuration for enhancing the serviceability of a dispenser includes a platform positionable on the housing of the dispenser. A refrigeration unit mounts at a center and rear portions of the platform. An electronic control is disposed within a housing that is mounted at a center portion of the platform adjacent to the refrigeration unit. The electronic control housing permits access to the electronic control from the front of the dispenser. An evaporator coil of the refrigeration unit includes concentric coil sections defined by an inner coil section, an intermediate coil section, and an outer coil section.

Abstract: A heat exchanger for heat exchange between a working fluid and a coolant having an inner casing, an outer casing, and an annular space formed therebetween. A tube bundle including at least one tube formed into a helical coil is located within the annular space. End plates are removably secured and sealed to the ends of the outer casing. Bulkhead fittings are mounted in openings of the end plates to seal the tube ends which pass through the end plates. The bulkhead fittings are sized to permit the end plates to be moved off of the bulkhead fittings in a direction away from the helical coil. The tube bundle may also include a separating plate extending longitudinally between the coils of two tubes within the tube bundle creating two separate passages through which coolant may flow. External tubes may be connected at the tube ends, outside of the outer casing and the end plates, such that the working fluid flows in a parallel single-pass flow or a series double-pass flow through the annular space.

Abstract: A high efficiency, non-contaminating fluid heater, including inner and outer helical passageways formed from an electrically non-conductive material and through which ultra pure fluid, such as ultra pure water, passes as it is heated. A coiled resistance heater is disposed about the helical outer surface of the inner helical passageway to heat by radiation, conduction and convection the ultra pure fluid which flows through the inner passageway. The outer passageway substantially surrounds the inner passageway and, at least in part, supports the outer passageway. The outer helical passageway is disposed to enable ultra pure fluid flowing therethrough to absorb radiated and convected heat from the coiled resistance heater to increase the efficiency of the fluid heater.