PENN Controls Products Catalog

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A28 Series Two-Stage Flange Mounted Duct Temperature Control Description The A28AK is a two-stage temperature control with special air coil sensing element and adjustable mounting flange. Refer to the A28 Series Two-Stage Temperature Controls with NEMA 1 Enclosure Product Bulletin (LIT-125130) for important product application information. Features • Flat flange mounting with special coil element permits positioning of sensing bulb in the appropriate portion of the air stream • Two single-pole, double-throw (SPDT) snap-acting switches • Unaffected by barometric pressure or cross ambient temperatures Applications These duct temperature controls are used on roof top units, make-up heaters, duct heaters, and air handling systems of all types. Figure 10: A28 Action Diagram Selection chart Table 48: Selection Chart Differential F° (C°) Fixed Product Code Number Number of Stages Switch Action Range °F (°C) Each Stage Between Stage Maximum Allowable Temperature at Bulb °F (°C) A28AK-1C Two Two-SPDT switches 30 to 110 (-1 to 43) 2 (1.1) 3 (1.7) 140 (60) A28AK-2C Two Two-SPDT switches 60 to 130 (16 to 54) 2 (1.1) 3 (1.7) 200 (93) 47

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