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Smart Equipment Control Board (SEC) Single Stage with Optional Capability Installation Instructions. Part No. Thermostat Only Control Enabled = No).The A419 control's front-panel, LCD, LED, and the. A419 control functions are described below. See the. Adjustments section for instructions on setting up and. The A350P is an electronic, proportional plus integral temperature control with analog 0 to 10 VDC and. 0 to 20 mA outputs. The control is equipped with. Refer to the following guidelines, procedures and illustrations when installing an A419 control. Parts Included. Each A419 control includes a Johnson Controls/ For a replacement thermostat, bulb well, or cover, contact the nearest Johnson Controls distributor. Page 4. 4 A19ANC/A19ANF/A19APC Installation Instructions. Designed to operate with both heating and cooling equipment, this control includes an adjustable differential and an interchangeable temperature sensor. As are