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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.
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