A 4-pipe WSHP in a two-pipe changeover loop, compared with 4-pipe all-season, (conceptual) is limited by which primary constraint in shoulder seasons in many designs?

Choices

• (A) No reheat in any VAV in any
• (B) Blower door only
• (C) Cannot simultaneously need heating and cooling in different zones in some transition weather without heat recovery+loop reset
• (D) Diesel 100% always