Condenser Install 3D

Introduction

This tutorial provides a comprehensive guide on installing a heat pump condensing unit, particularly in Florida. It outlines best practices from the initial preparation in the warehouse to the final inspections at the installation site. Whether you are a seasoned professional or a DIY enthusiast, this guide will equip you with the essential steps and tips for a successful installation.

Step 1: Prepare for Installation

• Gather Required Materials:

  • Heat pump condensing unit
  • Concrete pad
  • Heat strips
  • Appropriate circuit breaker
  • Tubing insulation
  • UL-rated silver tape
  • Duct sealant
  • Duct board
  • Hurricane straps
  • Plywood
  • Corrugated tubing

• Verify Unit Specifications:

  • Check the existing unit’s tonnage against the new unit’s tonnage.
  • Refer to Manual J and S calculations for accuracy.

Step 2: Site Assessment

• Inspect Electrical Disconnect:

  • Determine if the disconnect needs replacement.
  • Ensure there is no voltage (240v) between the legs or between one leg and ground.

• Check Data Plate:

  • Confirm that the circuit breaker and wire sizing are appropriate for the new unit.

Step 3: Recover Existing Refrigerant

• Prepare for Recovery:

  • Remove Schrader cores from both lines.
  • Use an analog gauge manifold for recovery.
  • Ensure the recovery tank is clean and empty; pull a vacuum if necessary.

• Recover Refrigerant:

  • Use a liquid line filter-drier.
  • Invert the recovery tank during the process.
  • Continue until the recovery machine reads just below zero.

Step 4: Disconnect and Prepare Lines

• Disconnect Electrical Components:

  • Safely remove all connections while ensuring no power is supplied.

• Copper Line Set Management:

  • Decide whether to reuse or replace the copper line set.
  • If reusing, perform pipe-wiping and clean with a foam pig, nitrogen, and hose.
  • If replacing, expose the chase and ensure enough space for the new copper lines.
  • Cut copper lines and take steps to minimize contamination.

Step 5: Drain System Considerations

• Inspect and Clean Drain:

  • Clean the existing drain with water and a shop vac.
  • Refill the trap after cleaning.

• Installation Guidelines:

  • Position the new concrete pad and drain at least two feet away from the house, each other, the dryer vent, and the disconnect.

Step 6: Brazing Copper Lines

• Prepare for Brazing:

  • Adjust torch regulators to 10 psi for oxygen and acetylene before use.
  • Start with the acetylene tank, then introduce oxygen.

• Perform Brazing:

  • Aim for a neutral or slightly carburizing flame.
  • Heat copper until it reaches a dark cherry red color to draw the alloy into the joint.
  • Allow joints to cool, then route copper lines as necessary.

Step 7: Seal and Test Connections

• Seal Joints:

  • Apply sealant on the male end of the new drain assembly and hold ends together.
  • Primer is only needed if the system is pressurized.

• Pressure Test:

  • Remove Schrader cores after sealing.
  • Test for leaks using a spray-on bubble solution.
  • Ensure no significant pressure decay occurs.

Step 8: Final Checks and System Charge

• Inspect System:

  • Verify all joints and connections are secure.
  • Clean up work area thoroughly.

• Charge System:

  • Release the refrigerant charge.
  • Check the thermostat wire and assess line lengths for additional charge if necessary.

Conclusion

Installing a heat pump condensing unit requires careful preparation and execution. By following these steps, you can ensure a successful installation that meets industry standards. Remember to prioritize safety and thoroughness at each stage. For further learning, consider checking out additional HVAC resources or training sessions.