18
Primary Piping
8
9
Cold Water Fill
Note 3
9
9
9
9
9
3
12
5
3
3
4
4
6
7
2
1
4
10
10
9
9
11
Note 2
Fig. 7: Primary Piping - Zoning with Zone Valves
1. Modulating Delta
2. Pressure Relief Valve
3. Automatic Air Vent
4. Drain/Purge Valve
5. Circulator
6. Air Separator
7. Expansion Tank-Diaphragm
8. Automatic Fill Valve
9. Isolation Valve
10. Zone Valve
11. Bypass Valve
12. Flow Check Valve
Notes:
1. Install a minimum of 12
straight pipe diameters
upstream of all circulators.
2. Adjust bypass for a mini-
mum of 3 gpm under any
operating condition.
3. Verify primary circulator is
properly sized to overcome
the system pressure drop and
provide adequate flow
through the appliance.
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