Operation Manual: Vacuum Frying Machine (Industrial VF Series)

1. SAFETY PRECAUTIONS

• Qualified Personnel Only: Operation restricted to trained, authorized staff.
• High Temperature & Pressure Risk: Avoid contact with hot oil, chamber, pipes; risk of burns.
• Vacuum Safety: Do not open chamber door under negative pressure. Vent fully first.
• Electrical Safety: Ensure proper grounding; no wet hands near control panel.
• Fire Hazard: Keep flammables away. Use food-grade oil only.
• Emergency Stop: Use E-Stop in abnormal conditions (leak, overheat, abnormal noise).

2. MACHINE SPECIFICATIONS

• Working Vacuum: -0.085 ~ -0.095 MPa
• Frying Temp: 70°C ~ 95°C (low-temp, product-dependent)
• Oil Volume: 100L / 200L / 500L (MIN–MAX marked)
• Power: 380V 50Hz 3-phase
• Materials: Food-grade SUS304 stainless steel
• Functions: Heating → Vacuum → Frying → Auto de-oiling → Venting → Discharge

3. BEFORE OPERATION (PRE-START CHECK)

1. Cleaning: Ensure chamber, basket, oil tank are clean; no food residue.
2. Oil Level: Fill cooking oil to between MIN and MAX lines.
   • Never run heating with no oil or low oil (prevents dry burning).
    
3. Utilities:
   • Connect power, confirm voltage.
   • Check water supply for vacuum pump (if water-cooled).
   • Check all valves, pipes, seals for tightness (no leaks).
    
4. Settings: On HMI, set:
   • Frying temperature: 80–90°C (fruits) / 85–95°C (vegetables)
   • Frying time: 20–60 min (product-dependent)
   • De-oiling time: 2–5 min
   • De-oiling speed: 10–15 Hz
    

4. STANDARD OPERATING PROCEDURE

Step 1: Preheat Oil

• Press HEAT; system heats oil to set temp.
• Monitor temperature; stabilize before loading.

Step 2: Load Material

• Cut raw materials uniformly (thickness 3–8 mm).
• Load into frying basket; do not overfill (max 70% capacity).
• Place basket in chamber; securely close and lock door.

Step 3: Evacuate (Pull Vacuum)

• Close vent valve; start vacuum pump.
• Wait until vacuum reaches -0.09 MPa.

Step 4: Start Frying

• Lower basket into hot oil (auto/manual).
• Start timer; basket rotates slowly for even cooking.
• Monitor via sight glass; do not leave unattended.

Step 5: De-oiling (Post-Fry)

• When time ends: lift basket; start centrifugal de-oiling.
• Run set time to reduce product oil content.

Step 6: Vent & Open Chamber

• Stop vacuum pump; slowly open vent valve to equalize pressure.
• Only open door when pressure = 0 MPa (atmospheric).

Step 7: Unload & Cool

• Remove basket; transfer product to cooling tray.
• Cool before packaging.

Step 8: Shut Down

• Press STOP; turn off heating.
• Cool oil below 60°C before filtering/storing.
• Clean chamber, basket, filters.
• Turn off main power and water.

5. MAINTENANCE SCHEDULE

Daily

• Clean chamber, basket, filters.
• Check oil quality; filter or replace if deteriorated.
• Inspect door seal for damage.

Weekly

• Clean vacuum pump oil/water separator.
• Check pipe connections for leaks.
• Calibrate temperature and vacuum gauges.

Monthly/Quarterly

• Replace vacuum pump oil (per manufacturer).
• Tighten electrical connections.
• Lubricate rotating parts (bearings, chains).

6. TROUBLESHOOTING

• Low vacuum: Check door seal; close valves; repair leaks.
• Temp not rising: Check heater; thermostat; power.
• Unstable frying: Uneven loading; low oil; incorrect vacuum.
• Excessive oil in product: Short de-oil time; low speed.
• Abnormal noise: Loose parts; bearing wear; pump issue.

7. TYPICAL PROCESS PARAMETERS (EXAMPLES)

• Banana chips: 85°C / 35 min / vacuum -0.09 MPa / de-oil 3 min
• Carrot chips: 90°C / 40 min / vacuum -0.09 MPa / de-oil 3 min
• Shrimp chips: 90°C / 25 min / vacuum -0.09 MPa / de-oil 2 min
• Mushroom chips: 85°C / 30 min / vacuum -0.09 MPa / de-oil 3 min

• Adjust parameters based on raw material, moisture, thickness.
• Keep this manual at machine for reference.