Maintenance tolerance shall not exceed plus or minus 2% on full or light load.

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Maintenance tolerance is the allowable deviation from the set value under operation. When it’s specified that it shall not exceed plus or minus 2% on full or light load, it means the measurement must stay within 2% above or below the nominal value regardless of whether the system is fully loaded or lightly loaded. This keeps performance consistent across different loading conditions. Larger tolerances, like ±4%, would let readings drift farther from the target. An asymmetrical tolerance or different limits for full versus light load would violate the stated uniform requirement. So the statement that the tolerance is plus or minus 2% on full or light load is the correct one.