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Tekmar Two Stage Setpoint Control. Two Stage Setpoint Control 152 is a microprocessor-based control that operates as eir a two stage setpoint control or as two independent setpoint controls. As a two stage setpoint control, 152 can provide two stage heating, two stage cooling or a combined heating / cooling interlock function. When operating as two independent setpoint controls, 152 can control any combination of heating or cooling device.