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Lennox 99K29 Relay 321894 706 turn the adjustment screw clockwise turn the adjustment screw clockwise to increase the pressure setting or counter clockwise to decrease it this tool is often used as the mechanical stage following a chemical flush to ensure all loosened calcium deposits are fully evacuated from the heat exchanger bundle effectively shielding motors from phase failure and sustained overcurrent conditions The amperage setting should be adjusted based on the blower motor’s nameplate FLA multiplied by the service factor (typically 1
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