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Press the UP button till dispaly reads 10 - this is the preferred setting for most applications. A419 Manual. Aquastat. 200. Johnson. Controls. A419 Manual.The A419 series controls are single-stage, electronic temperature controls with a Single-Pole, Double-Throw. (SPDT) output relay. They feature a lockable. Each A419 control includes a Johnson Controls/PENN. A99 temperature sensor. The sensor may be removed and replaced with any compatible Johnson Controls. A99