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Water Quality, Water Treatment and Freeze Protection - see Appendix A
Filling Boiler With Water And Purging Air For Systems With Diaphragm Type Expansion Tanks
Refer to the appropriate diagrams,“Near Boiler Piping” on page 11 for more information.
1.Close all zone service valves on the supply and return piping. Open the feed valve and fill boiler with water. Make sure air vent is open. Hold relief valve open until water runs air free for five seconds to rapidly bleed air from boiler, then let the relief valve snap shut.
2.Open the zone service valve on the supply pipe for the first zone. Open the purge valve on the first zone. Feed water will fill the zone, pushing air out the purge valve. Close the purge valve when the water runs air free.
Close the zone service valve.
3.Repeat step 2 for all remaining zones.
4.Open all service valves. Any air remaining trapped in the return lines between the service valves and the boiler will be pushed towards the air vent when the boiler is placed in operation.
5.Inspect piping system. Repair any leaks immediately.
Purging Air For Systems With Conventional Closed Type Expansion Tanks:
Refer to the appropriate diagrams“Near Boiler Piping” on page 11 for more information.
1.Close all zone service valves on the supply and return piping and close the expansion tank service valve. Drain expansion tank. Open the feed valve and fill boiler with water. Hold relief valve open until water runs air free for five seconds to rapidly bleed air from boiler, then let the relief valve snap shut.
2.Open the zone service valve on the supply pipe for the first zone. Open the purge valve on the first zone. Feed water will fill the zone, pushing air out the purge valve. Close the purge valve when the water runs air free.
Close the zone service valve.
3.Repeat step 2 for all remaining zones.
4.Open the expansion tank service valve and the tank vent. Fill the tank to the proper level and close the tank vent. Remove the handle from the expansion tank service valve so the homeowner doesn’t accidentally close it.
5.Open all service valves. Any air remaining trapped in the return lines between the service valves and the boiler will be pushed towards the expansion tank when the boiler is placed in operation.
6.Inspect piping system. Repair any leaks immediately.
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