C255-140R

• The PA404 is a series 40 (2-wire, SPST) Pressuretrol controller for use in 24, 120, 240 or 277 volt control circuits or in self powered (millivoltage) applications
• The PA404B is used with suspension-type unit heaters to make the fan circuit when a pressure rise indicates the presence of steam
• Each model contains an SPST micro-switch snap-acting switch
• Sensitive pressure-actuated diaphragm expands or contracts with pressure variations, moving a lever mechanism which operates the snap switch
• A screw on top of the case allows set point adjustment without removing the cover
• Differential is adjusted by means of a dial located inside the case
• Recommended minimum set point is differential setting plus 1-1/2 psi
• Tradeline value
• Stainless steel diaphragm sensor element
• Additive or subtractive differential type
• Makes at set point plus differential on pressure rise, breaks at set point on pressure fall
• 50 psi pressure surge
• 0.5-9 psi adjustable scale range,
  
  

  C354-1R

C346-70R

Sid Harvey Remanufactured C255-138R

C332-6R

C322-4R

C255-110R

C434-12R

High limit opens burner circuit only.
• Includes transformer and accessory terminals for adding a remote low limit controller.
• Case available for horizontal or vertical mounting.
• Requires a 24 VAC thermostat with heat anticipator set at 0.2 amps.
  
  

  C312-8R

• 3" insulation, stop factory set at 240 deg F, well adapter and heat conductive compound includes,
  
  

  C290-1R

• Time initiated and time terminated
• Adjustable frequency defrost from 1-6 cycle per day, minimum 4 hr between successive operations
• Defrost duration accurate to plus/minus 2 min
• Positive switch action slider bar
• Heavy-duty, synchronous, industrial type motor
• Switch contact arrangement: 2-4 close, 1-3 open, 3-N close,
  
  

  C255-118R

C312-10R