A2L Cased Replacement A-Coils

• Sustainable Coils A2L Cased Replacement A-Coils is your replacement solution for hard-to-find A2L coils piston metered for R454B or R32 applications. 
  
  • A2L applications are designated with an “A” as the first character in the model.
    
• All Uncased and Cased replacement coils utilize 3/8 OD Copper Tube, CU-122, 60 Fin Helical Tube .016 Back Wall with a 2,500 PSI Burst Pressure minimum.
• Stock A2L replacement coils are piston metered for R454B or R32 applications
  
  • R32 pistons are also available as additional piston packs, which can be ordered with the coils or in bulk through our wholesale distribution partners.
    
• Coils may also be ordered with adjustable Thermal Expansion Valves (TXVs), and all expansion valves are heat pump-compatible.
  • We utilize Parker HCAE adjustable charge expansion valves equipped with Chatleff fittings. Factory super heat preset 9°-12°.
    
• Plastic drain pans in standard widths, sturdy nylon resin is UL 94, 5VFR rated, and UV safe
  
• Sustainable Coils uses aluminum end plates to reduce rust corrosion. 
  
• Pre-swaged line connection, shipped with a dry nitrogen holding charge
  
• Each model has listed internal refrigerant volumes (IRV) to ensure compatibility with heat pump applications.
• All Sustainable Coils Cased HS Replacement Coils have a 5-year replacement warranty.​​​
  

STOCK A2L UNCASED REPLACEMENT A-COILS

Proudly Sourced & Manufactured in the USA

STOCK A2L CASED HORIZONTAL SLAB COILS

STOCK A2L CASED REPLACEMENT A-COILS

STOCK A2L MOBILE HOME REPLACEMENT COILS

A2L Field-Installed Refrigerant Detection Sensor

Danfoss 73G2090 Dual Refrigerant Sensor

• Sensor for R454B and R32
  
• Wires directly to furnace/air handler low-voltage terminals, for ease of application

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Sensor Kit Includes:

• 1 ea. Danfoss 73G2090 sensor
  
• 1 ea. 5’ connection cable
  
• 2 ea. 2” zip ties
  
• 1 ea. 2” x 4” (sticker) White refrigerant conversion label
  
• 1 ea. 2” x 4” (sticker) White wiring schematic label
  
• 2 ea. 1” x 1.5” (sticker) Red R32
  
• 2 ea. 1” x 1.5” (sticker) Red R454B
  
• 4 ea. 1” x 1.5” (sticker) Red Pipe (Refrigerant Safety Group A2L)
  
• 1 ea. 4” x 6” (sticker) Yellow (unit ID warning label A2L)
  
• 1 ea. 2” x 4” (sticker) Yellow (notice-unit must be powered)
  
• 1 ea. 1” x 2” (sticker) Green (RDS Status Lights)
  
• 2 ea. #8 x 1” self-tapping screws
  
• 2 ea. 5/8” grommets
  

A2L Field-Installation Instructions

Read all the instructions in this guideline carefully. ​If any of the instructions are unclear, clarify with a qualified licensed technician before proceeding. 

1. If not already plugged in, plug the 5’ sensor detection cable into the Refrigerant Detection Sensor (RDS). 
   
2. With the screws provided, mount the sensor directly onto the sheet metal delta plate on the front of the coil.
   
   1. The preferred position would be approximately 1” above the drain pan and below the suction line.
      
   2. If there is no room due to an installed TXV or feeder parts, find an open spot in the general area.
      
3. The sensor can be mounted horizontally or vertically for the desired directional orientation. 
   
   1. NEVER INSTALL THE SENSOR ON THE BOTTOM OF A CABINET UPSIDE DOWN!
4. Now run the 5’ cable to the electric/fan low-voltage control terminals.
   
   1. It may be necessary to drill a 5/8” hole to access the low-voltage terminals.
      
   2. Use the grommets provided to protect the cable.
      
   3. Use the bar ties to secure the looped cable after the proper length is determined.
      
   4. DO NOT ZIP TIE OR MAKE A SERVICE LOOP AT THE BOTTOM NEAR THE RDS SENSOR!
      
   5. DO NOT ZIP TIE THE CABLE TO PIPES!
5. On the furnace/air handler low-voltage terminal block:
   
   1. Connect the red wire to the “R” terminal 
      
   2. Connect the black wire to the “C” or “COM” terminal
      
   3. Connect the blue wire to the “G” terminal
      
   4. Connect theyellow wire to the “Y” or “Y1” terminal
6. Connect thewhite wire to the low-voltage wire coming from the “Y” or “Y1” from the terminal on the outdoor unit. 

A2L Replacement Coils with R454B Pistons

Types of A2L Coils

• A2L Uncased Replacement A-Coils
  
• A2L Cased Replacement A-Coils
  
• A2L Mobile Home Replacement Coils
  
• A2L Cased Horizontal Slab Coils
  

Additional pistons attached for suggested nominal tonnages