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What is the primary function of the evaporator pressure regulator valves installed in a multi-box refrigeration system?
A) limit the minimum evaporator coil pressure on those so fitted to prevent excessively low evaporator temperatures
B) limit the maximum evaporator coil pressure on those so fitted to prevent excessively high evaporator temperatures
C) maintain equal evaporator pressures among all system evaporators despite differences in box temperatures
D) maintain a constant compressor suction pressure regardless of changes in system demand
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