The 744-HC and 744-HCP Series are “first on/last off” electronic step controllers. They are available in 2, 4, or 6 stages, with S.P.D.T. (Form C) isolated pilot duty relays. Three Controllers may be sequenced providing up to 18 stages. The Step Controllers are assembled and mounted in a track with cover.
The 744-HC Series is capable of accepting five electric/electronic input signals; 10K (65°–85°F), Temperature Sensing IC (30°–160°), 1–20VDC, 1–20-mA and 0–135-Ohms. In addition, the 744-HC Series comes with an on-board setpoint and remote sensor. Each input signal has its own designated terminal block located on the PC board.
The 744-HCP Series features an on-board pneumatic transducer that directly accepts a 0–15 psi pneumatic input.
The versatile field programming allows the installer to select and program specific control functions to meet varying application requirements.
• Set any stage(s) on either heating or cooling internal ramp within the input signal range.
• Assign stage(s) to either direct or reverse acting mode.
• Each stage’s differential (hysteresis) is adjustable.
The Control incorporates two (0.6–14VDC) internal (heating/cooling) ramps that span the input signal ranges. This feature eliminates the
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