Utica Boilers UB95M-200 Installationsanweisungen

Turn off gas to boiler as described in “To Turn Off Gas 

To Appliance” Section 13.3 page 24.

If heating system is to remain out of service during 

freezing weather and does not contain antifreeze, drain 

system completely. If boiler will be exposed to freezing 

temperatures, drain condensate lines.

Following service procedures must be performed by 

qualified service agency. Boiler owner should not 

attempt these steps.

Before servicing, turn off electrical power to boiler at 

service switch. Close manual gas valve to turn off gas 

supply to boiler.

Examine flue passages by removing blower/burner 

assembly from casting. Procedure for examining and 

cleaning the burner is described below.

Clean any buildup of sediment or aluminum oxide (white 
powdery or flaky substance) in flue passages as follows:

A.  Remove jacket front and top panels.
B.  Confirm manual gas valve is closed and disconnect 

gas line to gas valve at union. Disconnect pressure 

switch hoses to gas valve and air inlet.

C.  Disconnect wires to gas valve and igniter.
D.  Loosen but do not remove five nuts attaching 

blower adapter assembly to boiler.

E.  Remove two igniter screws and carefully remove 

igniter.

F.  Remove five nuts and remove blower adapter 

assembly, burner, and gaskets.

G.  Aluminum oxide deposits are water soluble and 

may be rinsed away by inserting hose into burner 

opening of casting and slowly run water through 

flue side of boiler and out condensate drain. Debris 

rinsed away by this method will exit through 

condensate drain. Be wary of drain lines getting 

clogged and causing water to back up in the bottom 

of casting.

H.  Use flexible handle nylon brush to loosen sediment 

and aluminum oxide on all accessible heating 

surfaces of boiler. Take care not to get brush stuck 

in heat exchanger.

I.  After brushing and rinsing, remove any remaining 

loosened sediment using shop vacuum with snorkel 

attachment.

J.  Inspect burner for any foreign matter in flame 

ports or inside burner. Remove any foreign matter 

by blowing with compressed air or vacuuming. If 

burner cannot be cleaned, it must be replaced.

K.  Reinstall burner and gaskets and position blower 

adapter assembly over studs. Install five nuts do 

not tighten. Reinstall igniter and igniter gasket 

and fasten with two screws. Tighten five nuts 

L.  Connect gas line to gas valve, pressure switch hose 

to gas valve and air inlet assembly, igniter wires, 

and gas valve wires.

Inspect condensate trap. Clean out any foreign material 

visible in condensate lines.
A.  Inspect for sediment or blockage.
B.  Flush out with water or vacuum.
C.  Follow instructions in, “Filling Condensate Trap With 

Water.”

Inspect flue connector.

A.  Loosen clamp on vent tee side of 2” flexible 

coupling that connects vent tee to exhaust port.

B.  Inspect interior of vent tee. Clean any buildup of 

sediment on inside surface.

C.  Reconnect 2” flexible coupling to vent tee. 

Verify proper operation after servicing.

Perform regular service and maintenance by qualified 

service agency at least once every 12 months to 

assure safe, trouble free operation and maximum 

efficiency.

Following service procedures must be performed by 

qualified service agent. Boiler owner shall not attempt 

these steps. Failure to do so could result in death or 

serious injury.