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Dispenser freezes the water in the reservoir. The cold water slows and then stops as a block of ice forms in the inside of the dispenser. In removing a panel on the rear that has 4 screws, I see on either side of the unit there are rheostats with an adjusting screw.
A water cooler or water dispenser is  a device that cools and dispenses water. They are generally broken up in two categories: bottleless and bottled water coolers. Bottleless water coolers are connected to a water supply, while bottled water coolers require delivery (or self-pick-up) of water in large bottles from vendors.