Compressor Cooler Cores – Models 1613950800 & 1621700308

Two high-efficiency cooler cores designed for rotary screw air compressors in the 30–160 kW range. 1613950800 is an air-cooled combined aftercooler + oil-cooler core (aluminum bar-plate / louvered-fin construction) specified for GA30–GA75 class fixed-speed and VSD units. 1621700308 is a larger oil-cooler core (tube-and-fin or bar-plate) for GA90–GA160 class machines where oil-circuit heat rejection is higher and the cooling package is upsized. Both are direct-fit replacements for the OEM cooling module — no modification to the frame, fan shroud, or piping.

Key Features

• 1613950800: Air-cooled composite core, aluminum alloy headers, louvered copper/aluminum fins, 4–6 bar design pressure (air side) / 10–12 bar (oil side), suited to 30–75 kW frames

  
  

• 1621700308: Oil-cooler core, stainless or carbon tube stack with aluminum fins, 10–16 bar oil-side design, 1.0 MPa oil / 0.5 MPa water if water-cooled trim, suited to 90–160 kW frames

  
  

• Anti-corrosion coating (C3H-class paint/fin treatment) on external surfaces

  
  

• NBR or Viton O-rings on header plate — resistant to 80–100 °C continuous oil-mist

  
  

• Laser-etched part number and flow arrows on header for correct orientation

  
  

Technical Specifications

Application Guidance

1613950800 – Composite cooler core on GA30, GA37, GA45, GA55, GA75 air-cooled packages. Handles both the compressed-air aftercooling (drops discharge ~80–90 °C → 40 °C at 7 bar) and the oil-circuit cooling in a single pass. The combined core saves frame space — common on indoor canopy units where footprint is tight.

1621700308 – Dedicated oil-cooler core on GA90, GA110, GA132, GA160 air-cooled or water-cooled packages. At 90+ kW the oil-rejection load (~25–35 kW thermal) exceeds what a composite small core can shed, so the oil loop gets its own larger core — either a bigger air-cooled stack with a 2nd fan, or a water-cooled shell-and-tube / plate exchanger in water-cooled trims.

⚠️ Confirm cooling mode before ordering: 1613950800 = air-cooled composite only; 1621700308 = can be air- or water-cooled trim depending on sub-revision (GA90–160 have both). Check your machine tag — water-cooled trim needs the water-side end-bell and gasket set, which may ship separately.

Installation & Service

1. Isolate — shut down compressor, vent air receiver to 0 bar, drain oil if the oil circuit is being opened. Lock out electrics.

   
   

2. Unbolt fan shroud / guard, lift fan blade (note rotation arrow), then unbolt header plates. On 1621700308 water-cooled trim, close water inlet/outlet valves and disconnect hose tails — catch water, it'll be glycol mix.

   
   

3. Swap core — new core drops into the same mounting towers. Torque header bolts evenly (8–12 N·m typical, cross-pattern) — over-torque cracks the aluminum header.

   
   

4. Replace O-rings — always fit fresh Viton/NBR rings from the service kit; reused rings weep within 2000 h.

   
   

5. Reassemble fan, shroud, reconnect water hoses (if applicable). Bleed air from water side if water-cooled.

   
   

6. Test — run to operating temp, soap-test header joints and water connections. Oil outlet temp should stabilize 65–75 °C at full load, 40–50 °C discharge air at aftercooler outlet.

   
   

7. Maintenance cadence:

   • Every 2000 h: visual check fins for dust/oil cake; blow out with <3 bar compressed air (reverse fan flow direction).

     
     

   • Every 6000–8000 h: chemical foam cleaner on fins if dust load is high (cement, textile, wood shop). Never wire-brush aluminum fins — destroys the louvre and invites corrosion.

     
     

   • Winter layup (water-cooled): drain cooling water completely; freeze-cracked cores are the #1 failure mode in cold-storage/seasonal plants.

     
     

   
   

Failure Symptoms

• Rising discharge air temp (>45 °C at 7 bar) → fin clog or fan speed low → clean or check fan motor

  
  

• Oil outlet temp climbing >85 °C steady → oil-core fouling internally (scale on water side, varnish on oil side) → chemical descale or replace

  
  

• Weep at header O-ring → re-torque first; if persists, header face may be warped — skim or replace core

  
  

Quality Notes

• Bar-plate and tube-fin constructions burst-tested ≥ 4× design pressure

  
  

• Fin coating C3H-class (ISO 12944) for coastal/humid sites

  
  

• O-rings compounded for PAO & ester synthetics, 80–100 °C continuous

  
  

• Dimensional check against OEM header bolt pattern before packing

  
  

Ordering

Specify 1613950800 (composite air+oiled cooler core, GA30–75 air-cooled) or 1621700308 (oil-cooler core, GA90–160, air- or water-cooled trim) with quantity. For 1621700308, state whether your unit is air-cooled or water-cooled — the end-bell and O-ring kit differ. Provide compressor model + serial number to confirm sub-revision (GA90 vs. GA110 header bolt count varies).

All values nominal; confirm cooling mode (air vs. water), header bolt pattern, and O-ring compound against your machine's parts book before ordering. Water-side trim requires separate drain during winter layup.