HTP FP-40SC - Manual (Page 26)

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After determining gpm flow rate and total system head loss, a properly sized pump can be chosen. See
recommendation from pump supplier to determine the proper pump for your job. Incorrect pump size will
reduce or fail to deliver solar contribution.
To further increase solar production, use a variable speed solar pump controller (HTP part # 8600-047).
PART 7 – SYSTEM PIPING DIAGRAMS
Figure 23 – System Piping Concepts
A. REVERSE RETURN
Below you will find suggested collector piping diagrams utilizing reverse return for balanced flow:
NOTE: Landscape or horizontal examples not recommended for drain back systems.