ECR International Dunkirk WPSB 3 Series Installation, Operation & Maintenance Manual page 13

4 - CONNECTING SUPPLY AND RETURN PIPING
Bypass Piping Required For High Mass (Large Water Content) Systems
Figure 6 - Bypass Piping - Circulator On Supply
Figure 7 - Bypass Piping - Circulator On Return
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PN 240013090 REV. C [10/01/2021]