Safe Handling of Refrigeration Gauges

Nov 9, 2024

Lecture on Safely Handling and Using Gauges on Refrigeration Units

Introduction

  • Importance of proper handling of hooks and gauges to prevent damage to HVAC units.

Handling the Hook

  • Correct Hook Placement:
    • Avoid damage to aluminum fins and paint.
    • Secure hook properly without damaging the fins.
  • Types of Hooks:
    • Use wider hooks carefully, ensuring they do not damage the unit.

Installing Gauges

  • Suction Side:
    • Hook up the suction side first, unit can be running or off.
    • Ensure there's enough refrigerant before starting the system.
    • Remove valve cap, keeping it secure and clean to prevent dirt contamination.

Safety Measures

  • Handling Refrigerant:
    • Use two-finger method for fitting handling to protect fingers from refrigerant exposure.
    • Optional gloves: Must be refrigerant-rated butylene lined gloves.
  • Pressure Tightening:
    • Ensure fittings are tight enough to show pressure.

High Side Procedures

  • High Side Connection:
    • More caution due to high pressure liquid refrigerant.
    • Use two-finger method to ensure safety when connecting.
  • Rebuilding Fittings: Importance of maintaining fittings to prevent leaks during connection.

System Operation

  • System Off State: Equal pressures on suction and head side.
  • System On State:
    • Low pressure vapor is sucked in, high pressure vapor is pumped out.
    • Monitor saturated temperatures for proper functioning.
    • Allow system to run for about 15 minutes for accurate readings.

Removing Gauges

  • Suction Side Removal:
    • Use two-finger method, minimize refrigerant loss.
    • Avoid contamination by securing hose ends properly.
  • High Side Removal:
    • Perform quickly using two-finger method.
    • Do not vent liquid refrigerant; return it to the system to avoid EPA violations.

Final Steps

  • Refrigerant Handling:
    • Ensure no liquid refrigerant remains in hoses.
    • Equalize pressures safely without loss to the environment.
  • Valve Caps:
    • Importance of ensuring rubber O-ring presence.
    • Avoid using plastic valve caps due to potential issues.

Conclusion

  • Summary of safe practices for handling HVAC unit gauges and refrigerant management.
  • Upcoming: Further discussion on valve caps.