Lennox XC25 – System Refrigerant

The Lennox XC25 uses R-410A refrigerant. R-410A is a non-chlorine, ozone-friendly refrigerant that is becoming increasingly common in new HVAC systems. It is more efficient than older refrigerants, such as R-22, and it has a lower global warming potential.

R-410A is a blend of two different refrigerants, HFC-32 and HFC-125. It is a high-pressure refrigerant, so it is important to use a qualified HVAC technician to service any system that uses R-410A.

If you have a Lennox XC25 air conditioner, it is important to check the refrigerant level regularly. If the refrigerant level is low, it can cause the system to lose efficiency and even break down.

Here are some tips for maintaining the refrigerant level in your Lennox XC25 air conditioner:

  • Have the system serviced by a qualified HVAC technician at least once a year.
  • Check the refrigerant level yourself every few months. You can do this by using a refrigerant pressure gauge.
  • If the refrigerant level is low, have the system recharged by a qualified HVAC technician.

By following these tips, you can help to ensure that your Lennox XC25 air conditioner operates efficiently and reliably for many years to come.

This section outlines the procedures to:
1. Connect a gauge set for testing and charging as illustrated in fig­ure 55.
2. Check and adjust indoor airflow as described in figure 56.
3. Add or remove refrigerant using the weigh-in method shown in figure 57.

4. Verify the charge using the subcooling method described in fig­ure 58.

IMPORTANT: Unit must be operating at 100% input to be charged properly.

This system uses HFC-410A refrigerant which operates at much higher pressures than HCFC-22. The pre-installed liquid line filter drier is approved for use with HFC-410A only. Do not replace it with components designed for use with HCFC-22.

Check airflow using the Delta-T (DT) process using the illustration in figure 56.
The diagnostic screen on the thermostat or outdoor control 7-seg­ment display shows indoor and outdoor motor CFMs or RPMs.

Use the WEIGH-IN method for adding initial refrigerant charge, and then use SUBCOOLING method for for verifying refrigerant charge.

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