Utica Boilers UB90-200 Istruzione Sull'Installazione

Follow the instructions in “WHAT TO DO IF YOU SMELL 

GAS” on page 29.

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. 

Otherwise, do not drain system or boiler.

Examine flue passages. Remove blower assembly from 

casting. Follow procedure for examining and cleaning 

burner is described below.

Any buildup of sediment or aluminum oxide (white powdery 

or flaky substance) in flue passages must be cleaned 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.

C.  Disconnect wires to gas valve and igniter.
D.  Remove air inlet assembly from gas valve.
E.  Loosen, do not remove five nuts attaching blower 

adapter assembly to boiler.

F.  Remove two igniter screws. Carefully remove 

igniter. Do not touch igniter element with your 

fingers or hands as oils or debris will cause 

premature failure.

G.  Remove five nuts and blower adapter assembly. 

Remove burner and gaskets.

H.  Aluminum oxide deposits are water soluble and 

may be rinsed away with spraying or running 

water.

I.  Use flexible handle nylon brush to loosen sediment 

and aluminum oxide on all exposed heating 

surfaces of boiler. Take care brush does not get 

stuck in heat exchanger.

J.  After brushing and rinsing, remove any remaining 

loosened sediment using vacuum with snorkel 

attachment.

K.  Inspect burner for foreign matter in flame ports 

or inside burner. Remove any foreign matter by 

blowing with compressed air or vacuuming.

L.  Install burner and gaskets. Position blower adapter 

assembly over studs. Install five nuts, do not 

tighten. Install igniter and igniter gasket and fasten 

with two screws. Do not touch igniter element with 

your fingers or hands as oils or debris will cause 

premature failure. Tighten five nuts holding blower 

adapter assembly.

M.  Connect gas line to gas valve; air inlet assembly 

to gas valve (using 2” x 1½” flexible coupling); 

pressure switch hose to gas valve and air inlet 

assembly; 2” flexible coupling to boiler exhaust 

port; igniter wires; and gas valve wires.

Visually inspect condensate trap. Clean out any visible 

foreign material or debris from condensate lines as 

described below.

A.  Inspect for sediment or blockage.
B.  Flush out with water or vacuum.
C.  Follow instructions in “Near Boiler Piping” on page 

8,

 

for filling condensate trap with water. 

Inspect flue connector using following steps. 

A.  Loosen clamp on draft inducer end of 2” flexible 

coupling connecting vent tee to exhaust port.

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

sediment on inside surface.

C.  Connect 2” flexible coupling to draft inducer outlet. 

Before servicing, turn off electrical power to boiler 

at service switch. Close manual gas valve to turn 

gas supply OFF to boiler. Failure to comply will result 

in death or serious injury.

  

Perform regular service and maintenance by 

qualified service agency at least once every 12 

months to assure safe, trouble free operation and 

maximum efficiency.

Verify proper operation after servicing.

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.