Utica Boilers UB90-200 Installationsanweisungen

Set Thermostat To Desired Temperature
Set thermostat to desired room temperature and observe 

several complete cycles to verify proper operation.

Final Review And Sign-Off
Review all instructions shipped with this boiler with owner 

or maintenance person. Affix instructions on or adjacent to 

boiler. 

Appliance should operate between 8.5 And 10% CO2. 

Verify boiler is operating in this range. Follow steps below.

Under all conditions CO levels should not exceed 

100ppm.

Check incoming gas pressure to appliance using 

pressure gauge with resolution of 0.1” w.c. or better 

and range from 0” to at least 14” w.c. 

A.  Close gas shut-off inside boiler jacket. 
B.  Locate inlet pressure tap on gas valve. Figure 18, 

Page 26.

C.  Open inlet pressure tap screw ½ turn. Connect 

positive side of pressure gauge to inlet pressure 

tap. 

D.  Open gas shut-off. 
E.  Gas pressure 

• between 4” and 10” w.c. natural gas 
• between 10” and 14” w.c. propane gas.

Drill hole in plastic CPVC pipe for combustion analyzer. 

Turn thermostat to closed position to activate boiler.

Allow boiler to run for 5 minutes.

Insert combustion analyzer sample probe into hole just 

drilled, about halfway into exhaust gas stream. 

A.  Take flue gas reading and observe CO2 value. 
B.  Adjust throttle screw until CO2 value is between 

8.5 And 10%. (O2 between 5.5% and 2%) 

C.  Turning throttle screw counter clockwise increases 

rate and CO2 value. 

D.  Turning throttle screw clockwise decreases rate and 

CO2 value. 

E.  Allow boiler to stabilize for 1 minute after adjusting 

throttle screw before taking  reading with 

combustion analyzer. 

After adjustments are made stop appliance. Disconnect 

pressure gauge.  Tighten inlet pressure tap on gas 

valve, remove CO2 meter from CPVC pipe.

Seal hole in CPVC pipe with appropriate material.

Return thermostat switch to its original position.

Installation Final Checkout
After any adjustment to boiler, observe several complete 

cycles to ensure all components function correctly.