• 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,
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• Positive slide bar switch design assures positive electrical contact and wipes the contact surface of contaminates
• Temperature or pressure terminated models are designed to stop defrosting using an external temperature or pressure device
• Safety back-up - mechanical time-driven defrost termination
• Heavy-duty synchronous design drive motor
• Choice of 3-contact arrangements
• Adjustable frequency of defrost initiation from 1 - 6-cycles per day with a minimum of 4 hr between successive operations
• Adjustable back-up defrost termination from 4 - 110 min in 2 min increments
• Have an adjustable cut-in pressure dial calibrated from 36 - 110 lb for R12, R22, R502
• Time initiated/temperature or pressure terminated
• Open switch arrangement for contacts 1 - 3, closed switch arrangement for contacts 2 - 4, closed switch arrangements for contacts 3 - N
• Electric heat, hot gas or compressor shutdown
• 1 year limited warranty Paragon 8141-00 Heavy-Duty Steel Commercial Mechanical Defrost Control, 4 - 110 min, SPDT (1) NO - (2) NC, 120 VAC Electrical, 120 - 240 VAC Switch, 40 ampSid Harvey Item #:C255-130R: Replaces Part #:'s : C255-130,
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Sid Harvey Remanufactured C255-138R

• Pressure actuated high limit, safety control for steam heating boilers, It breaks an electrical circuit to shut down the burner if steam pressure rises above a safe level
• 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 setpoint adjustment without removing the cover
• Differential is adjusted by means of a dial located inside the case
• Recommended minimum setpoint is differential setting plus 1-1/2 psi
• Stainless steel diaphragm sensor element
• Makes at setpoint on pressure fall breaks at setpoint plus differential on pressure rise Honeywell Pressuretrol PA404A Pressure Controller with additive differential, 0.5 - 9 psi, 3-3/8 Inch W x 4-15/32 Inch H x 2-1/4 Inch D,
  
  

• 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,