A retrofit specification permits only refrigerant X with a listed compressor/oil combination. A proposal substitutes refrigerant Y without compatibility data. What should the reviewer do?
- AAccept Y solely because its boiling point is lower.
- BMix X and Y to average their properties.
- Require documented compatibility and approval before accepting the substitution.
- DAssume every low-temperature refrigerant is interchangeable.
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why C is correct
The scenario gives a specific approved combination. Refrigerant selection must respect that constraint; a temperature alone does not authorize a substitute or mixture.