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21
Primary Piping
1
12" max.
2
2
3
6
2
3
6
2
3
2
3
2
2
2
5
L
O
A
D
L
O
A
D
1
2
2
2
2
2
5
2
4
6
4
12" max.
L
O
A
D
L
O
A
D
Fig. 8: Primary piping - Zoning with Circulators
Fig. 9: Primary Piping - Zoning with Zone Valves
1. Appliance circulator
2. Shut-off valves
3. Flow check valve
4. Zone valve
5. System purge valve
6. System circulator
Note: See page 20 for near appliance piping.
• Install balancing valves to
adjust flow to distribute
heat to all zones
• Size primary manifold for
total flow of all circulators
• Size each circulator to indi-
vidual circuit requirements
• Install balancing valves to
adjust flow to distribute
heat to all zones