A28 Series Two-Stage Temperature Control
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A28 Series Two-Stage Temperature Controls With NEMA 1 EnclosureApplication
These two-stage controls are designed to cover a broad range of general purpose operating temperature control applications in the refrigeration, air conditioning and heating fields.
Two SPDT switches permit independent control circuits. Each switch may be wired for “open high” or “close high” action, as required, providing automatic changeover on heating-cooling or similar requirements. Models are available with close differential on each switch. A jumper across the “common” terminals is supplied as a standard feature. Models are available for fixed or adjustable between stage differential.
All Series A28 temperature controls are designed for use only as operating controls. Where an operating control failure would result in personal injury and/or loss of property, it is the responsibility of the installer to add devices (safety, limit controls) or systems (alarm, supervisory systems) that protect against, or warn of, control failure.
Replaces part number: A28AA-81