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System Interface Module (SIM)
SIM - System Interface ModuleThe System Interface Module (SIM) is connected in series with the air conditioning or refrigeration control circuit to optimize the compressor or compressor capacity control operation.

Each SIM has two channels with a provision for an external override, which can be activated by any type of external switching device such as a thermostat or pressure switch.

Up to four SIMs can be connected in series to a single LNC, providing optimization for up to 8 compressors from one ESM™ unit.