Honeywell Commercial T678A1437 Remote Temperature Controller

The Honeywell Commercial T678A1437 Remote Temperature Controller provides precise, reliable temperature control for boilers, tanks, ducts, and pipes. The copper sensing bulb with a 5-foot capillary delivers fast, accurate readings in demanding commercial environments, while the 1/2-inch conduit connection simplifies installation. This unit features a two-SPDT contact configuration and carries UL and CSA approvals for safe operation.

Key specifications give you flexible control for everyday industrial applications: set point range 0–100°F with a fixed 3°F differential or adjustable 3–10°F interstage; maximum temperature rating 125°F; and robust load handling up to 2000 VA (8A at 120V AC, higher at other voltages). The compact enclosure measures 2" W x 2-5/8" D x 5-5/8" H and supports standard knockout sizes (2 × 7/8").

• Remote sensing via copper bulb and 5 ft capillary for accurate monitoring
• SPDT contacts enable versatile circuit switching
• Adjustable and fixed differential 3–10°F or fixed 3°F
• Set point 0–100°F for precise temperature control
• UL and CSA approved for safety and compliance
• Rugged construction with 1/2" conduit connection