• 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,
  
  
  
  

  Sid Harvey Remanufactured C354-1R

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  Sid Harvey Remanufactured C434-7R

• Immersion-type controllers that combine high limit protection with switching relay control of burner and circulator motors
• High limit opens burner circuit only
• Require 24 VAC thermostat with heat anticipator set at 0.2 amp (plus current draw of gas valve on L8124E)
• 1-1/2 - 3 Inch depth less well insulation
• Electrical burner rating: at full load: 7.4 amp at 120 VAC, 3.7 amp at 240 VC; at locked rotor: 44.4 amp at 120 VAC, 22.2 amp at 240 VAC; millivolt: 0.25 amp at 1/4 - 12 VDC
• Electrical circulator rating: at full load: 7.4 amp at 120 VAC, 3.7 amp at 240 VAC; at locked rotor: 44.4 amp at 120 VAC, 22.2 amp at 240 VAC Honeywell L8148J1009/U Aquastat Relay, 120 VAC at 60 Hz, SPST, 120 - 240 deg F High Limit, 8 deg F Fixed Differential,
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  Sid Harvey Remanufactured C312-8R

Sid Harvey Remanufactured C434-12R

Sid Harvey Remanufactured C290R

Sid Harvey Remanufactured C317R

• Immersion type controllers that combine high limit protection with low limit and circulator control in forced hydronic heating systems
• Provide multi-zone control by using a separate circulator and R845 relay for each zone
• Include diaphragm powerhead and micro switch assembly that respond to temperature changes in boiler water
• Mount directly to boiler
• Select models include large transformers and extra terminals for supplying power to low voltage zone valves
• Require 24 VAC thermostat with heat anticipator set at 0.2 amp (plus current draw of gas valve on L8124E)

Sid Harvey Remanufactured C317-14R

Sid Harvey P4-196BR

Sid Harvey P4-70BR

Sid Harvey P4-83BR

Sid Harvey Remanufactured B74-2R

Sid Harvey Remanufactured B79R