Start Up; A - Filling Boiler With Water And Purging Air For Systems With Diaphragm Type Expansion Tanks; B - Purging Air For Systems With Conventional Closed Type Expansion Tanks - Dunkirk Quantrum 90-50 Installation Manual

A – Filling Boiler With Water And Purging Air For
Systems With Diaphragm Type Expansion Tanks
Refer to the appropriate diagrams in Section VII, "Near Boiler
Piping, " for more information.
1.
Close all zone service valves on the supply and return pip-
ing. 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.
B – Purging Air For Systems With Conventional Closed
Type Expansion Tanks:
Refer to the appropriate diagrams in Section VII, "Near Boiler
Piping, " 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

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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.
Note:
DO NOT use stop leak compounds. Leaks in threaded con-
nections in the aluminum boiler sections must be repaired
immediately. Aluminum threads will not seal themselves.
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