A refrigeration system using R-717 (ammonia) is installed in a commercial ice rink. Where are refrigerant detection systems NOT typically required by CSA B52 for this application?

Question: A refrigeration system using R-717 (ammonia) is installed in a commercial ice rink. Where are refrigerant detection systems NOT typically required by CSA B52 for this application?

Answer options:

• The main machinery room housing the compressor and receiver.
• The ice rink arena (occupied space).
• The service corridor immediately adjacent to the machinery room. ✅ The outdoor condenser unit enclosure.

Correct answer: The outdoor condenser unit enclosure.

Explanation: CSA B52, Section 8.11.1, requires refrigerant detection in machinery rooms for certain refrigerants, and in occupied spaces where refrigerant concentrations could exceed specified limits. While it might be required in the machinery room, adjacent corridors, or the arena itself (due to potential leaks), an outdoor condenser enclosure, being open to the atmosphere, would not typically require a fixed detection system.