When replacing a failed R-22 condensing unit with a new R-410A condensing unit, what must happen to the existing R-22 evaporator?

When replacing a failed R-22 condensing unit with a new R-410A condensing unit, what must happen to the existing R-22 evaporator?

• A. The existing R-22 evaporator must be replaced.
• B. The suction line must be increased one pipe size.
• C. The suction line insulation must be 3/4".
• D. The existing R-22 evaporator can be reused.

Answer: (A)

When replacing a failed R-22 condensing unit with a new R-410A condensing unit, it is essential to understand the compatibility requirements between the refrigerants and the components of the system. The existing R-22 evaporator must be replaced because R-410A operates at higher pressures than R-22. R-22 evaporators are not designed to handle these increased pressures, which could lead to safety issues, potential failure of the evaporator, and ineffective system performance. Using an existing R-22 evaporator with an R-410A system could result in significant risks, including refrigerant leaks, reduced efficiency, and even damage to the new condensing unit. The materials and construction methods used for evaporators designed for R-22 are typically not suitable for the higher pressures present when using R-410A. Thus, for both safety and system efficiency reasons, replacing the existing R-22 evaporator with one that is compatible with R-410A is necessary to ensure the new system operates correctly and reliably.

When replacing a failed R-22 condensing unit with a new R-410A condensing unit, it is essential to understand the compatibility requirements between the refrigerants and the components of the system. The existing R-22 evaporator must be replaced because R-410A operates at higher pressures than R-22. R-22 evaporators are not designed to handle these increased pressures, which could lead to safety issues, potential failure of the evaporator, and ineffective system performance.

Using an existing R-22 evaporator with an R-410A system could result in significant risks, including refrigerant leaks, reduced efficiency, and even damage to the new condensing unit. The materials and construction methods used for evaporators designed for R-22 are typically not suitable for the higher pressures present when using R-410A.

Thus, for both safety and system efficiency reasons, replacing the existing R-22 evaporator with one that is compatible with R-410A is necessary to ensure the new system operates correctly and reliably.