No... flowrate too low will not cause water to freeze inside the chiller. It has a thermostat in the chiller. When the water in the chiller reaches the set temperature, it will cut off the chiller.
However, too low flowrate will cause the chiller to cut in and out too often. The water in the chiller gets chilled very fast and reaches the set temperature in a short time. When temperature is reached, it cuts off the chiller. However, very soon when warmer water from the tank enters the chiller, the chiller cuts in again. This repeats itself very frequently (probably a few minutes interval).
The recommended flowrate depend on the chiller design.
BC
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