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.
24 Installation, Operation, And Service Instructions