In HVAC hydronic line sizing, if equivalent length of fittings greatly exceeds straight pipe in a branch, the designer should (conceptual)?

Choices

• (A) Include all fitting losses in head calculation (C or K method) to avoid under-sizing pumps
• (B) Ignore all fittings in hot water return
• (C) Use FPM in suction only for all
• (D) Rely on sight glass in pump