42 AMP 400-1000L I&O Manual
A
B
From System
Purge Valve
Air Vent
Pressure Reducing Valve
System Pump
To System
Make Up Water
Isolation Valve
Y-Strainer
Boiler Pump
Check Valve
Expansion Tank
No more than 12 inches or 4 pipe diameters
A.
At least 18" of straight pipe for conventional air scoopB.