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Supply and return and system piping should be sized by determining the pressure drop,
required flow rate and pump capacity.
WARNING
Discharge piping from relief valve must be piped to a drain or must terminate 6” above
floor to eliminate damage to the structure or personal injury. It must not be piped to a
point where freezing might occur.
1. MULTIPLE ZOINING WITH ZONE VALVES -----
See Figure 18. Install a balancing valve in each zone and adjust so that flow is about
the same in each zone.
Isolation Valves
Zone Valves
Cold Water Feed
Drain Coc
k
Shutoff Valves
S
R
SYSTEM PIPING
Circulation Pump
Figure 18.
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Installation, Operation, And Service Instructions