1. Purpose & Function

·     Acts as a hydraulic air damper actuator, enabling precise control of combustion airflow across different stages (low-fire, high-fire, etc.).

• Operates mechanically via fuel-pressure, not electrically—uses oil pressure to move the damper arm to a predefined position.

2. Location & Integration

• Mounted on the air damper assembly (“hydraulic jack with air damper” in burner diagrams).
• Each damper stage (1st, 2nd, 3rd for multi-stage units) has its own jack mechanism to correspond with nozzle stages .

3. Adjustment & Operation

• Airflow adjustment:
  • A hexagonal body and ring nut allow fine adjustment—turn clockwise to decrease airflow, counter‑clockwise to increase airflow.
• Use during commissioning: After setting fuel pressure and nozzle size, the jacks are adjusted so damper movement matches required airflow for each stage.

4. Service & Troubleshooting

• Leakage or drift:
  • If a jack leaks or the damper fails to hold position, it can cause lean flame or combustion instability—as reported in field forums → repair or replace the jack unit rather than over-tightening adjustment nuts.
• Replacement process:
  • Typically held with a gland-nut on the oil feed. Use gland-nut pliers to unscrew.
  • Once removed, the oil feed can be blanked off if not using damper control.

5. Common Part Numbers & Compatibility

6. Commissioning Checklist

1.        Set nozzle & pump pressure first (e.g. 12 bar per specs).

2.        Adjust hydraulic jacks:

o   Turn hex body to calibrate damper positions for each combustion stage.

3.        Test burner through all stages while monitoring smoke/flue gas; fine-tune jack settings for optimal combustion.

4.        Inspect for leakage: Replace any leaking jack; ensure secure gland nut connection.