Amtrol Parts B135-71

McDonnell & Miller B122-4

Amtrol Parts B135-70

McDonnell & Miller CO-12

Burner circuit contacts open after 15 sec delay in a low water condition
• Automatically reactivates burner circuit 30 sec after water reaches the probe, allowing optional water feeder to raise water level above the probe
• Intermittent level test (ILT) feature provides maximum boiler protection by removing power from the burner circuit at set intervals
• NEMA 1 enclosure
  
  

  Hydrolevel CG4501560

Intermittent level test - maximum protection for foaming boilers
• 15 sec burner off delay
• 30 sec burner on delay
• Low water indicating light
• Direct boiler mounting - eliminates blowdowns
  
  

  Hydrolevel CG400-2090

An immersion type liquid-filled sensing element actuates (2) snap switches
• (1) switch operates as a high limit control
• The other switch operates as a low limit and/or circulator control, depending on the model
• Controller may be mounted in any positioning and needs no leveling
• Separate, easy-to-read, calibrated dial and setpoint adjustments for each switch
• Differential adjustment on low limit or circulator switch on select models
• All adjustments accessible inside front cover
• Push-in terminals for quick connecting
• 1-sensing element for easy installation
• (2) SPST snap switches act independently at respective temperature settings
• 3" insulation depth
• 360 VA transformer load ignition electrical ratings
• High limit, low limit and/or circulator controllers used to regulate boiler water temperature in gas- or oil-fired hydronic heating systems
  
  

  Honeywell C322-4A

Immersion-type controllers that combine high limit protection with low limit and circulator control in forced hydronic heating systems, including domestic hot water service
• Require 24 VAC thermostat with heat anticipator set at 0.2 amp (plus current draw of gas valve on L8124E)
• Include diaphragm powerhead and micro Switch assembly that respond to temperature changes in boiler water
• Mount directly to boiler
• Provide multi-zone control by using a separate circulator and R845 relay for each zone
• Electrical burner rating: 1.25 amp at 24 VAC; 30 VA (total load) terminals B1-B2 and TV-Z
• 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 C317-7

• Totally enclosed micro switch snap-acting switches operate on temperature rise to setpoint
• Visible control point scale and external adjustments screw permit easy setting
• Horizontal or vertical insertion of the sensing element
• Remote bulb model may be used to sense air temperature in ducts and in outside air sensing applications
• Direct or well immersion of the sensing element
• Includes heat-conductive compound, well adapter Honeywell L4006E1067 High Limit Manual Reset Aquastat, 130 - 270 deg F, 10 - 25 deg F Differential
  
  

  Honeywell C290-6

Totally enclosed micro switch snap-acting switch
• Visible control point scale and external adjustments screw permit easy setting
• Available horizontal or vertical mounting of the remote element into boiler, tank or other container
• Remote temperature sensing element detects and responds rapidly to temperature changes
• Case mounts to a vertical surface
• Includes 66" length capillary tubing, stop factory set at 240 F
  
  

  Honeywell C293-4