Why does crystallization occur?
The most common reason for crystallization is due to power failures. If a chiller-heater is running
at full load and power is interrupted for a sufficient length of time, the concentrated solution in the
high side of the unit (condenser/generator section) eventually cools down. As no dilution cycle was
performed, the solution concentration in some areas of the unit can still be relatively high. If the
temperature of this concentrated solution falls low enough, the solution can reach its crystallization
point. Plant room temperature, insulation quality, and the solution concentration all play a part
in determining how long it takes before the unit crystallizes. See
for information
on water quality control and crystallization. The Duhring Diagram / PTX Chart shows the specific
temperatures and pressures of the crystallization area. See Figure 82 and Figure 83.
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Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
