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A19 Series Coiled Bulb Space Temperature Control Description The A19 Series Control is a wide range temperature control with air coil sensing element. Refer to the A19 Series Utility Thermostats for Farm, Industrial, and Commercial Use Product Bulletin (LIT-125030) for important product application information. Features • Wide temperature range • NEMA 1 enclosure Applications Use for return air or space temperature sensing. Figure 5: A19 Series Terminal Arrangement for SPDT 26