Utica Boilers UB90-200 Installationsanweisungen

With Conventional Closed Type Expansion Tanks
Refer to diagrams on “Near Boiler Piping” on pages 9 and 

10 for more information.

Close all zone service valves on supply and return 

piping. Close expansion tank service valve. Drain 

expansion tank. Open 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, let 

relief valve snap shut.

Open zone service valve on supply pipe for first zone. 

Open purge valve on first zone. Feed water will fill 

zone, pushing air out purge valve. Close purge valve 

when water runs air free. Close zone service valve.

Repeat step 2 for remaining zones.

Open expansion tank service valve and tank 

vent.  Fill tank to proper level and close tank vent. 

Remove handle from expansion tank service valve so 

homeowner doesn’t accidentally close it.

Open all service valves. Any air remaining trapped 

in return lines between service valves and boiler will 

push towards expansion tank when boiler is placed in 

operation.

Inspect piping system. Repair any leaks immediately.

With Diaphragm Type Expansion Tanks
Refer to the appropriate diagrams “Near Boiler Piping” on 

pages 10 and 11.

Close all zone service valves on supply and return 

piping. Open feed valve and fill boiler with water. Verify 

air vent is open. Hold relief valve open until water runs 

air free for five seconds to rapidly bleed air from boiler, 

let relief valve snap shut.

Open zone service valve on supply pipe for first zone. 

Open purge valve on first zone. Feed water fills zone, 

pushing air out purge valve. Close purge valve when 

water runs air free. Close zone service valve.

Repeat step 2 for all remaining zones.

Open all service valves. Any air remaining trapped 

in return lines between service valves and boiler 

are pushed towards air vent when boiler is placed in 

operation.

Inspect piping system. Repair any leaks immediately.

Do not use stop leak compounds or other chemicals 

not listed in this manual. Repair leaks in threaded 

connections of aluminum boiler sections. Aluminum 

threads do not seal themselves.

Systems with automatic fill valves and leaks will cause 

excessive fill water. This water contains oxygen. 

Excessive oxygen will cause the aluminum boiler to 

corrode over time.  All system leaks should be repaired 

immediately.