Utica Boilers UB95M-200 インストール手順

Drill ½” hole in plastic CPVC vent pipe or exhaust 

tee, just large enough to allow access for combustion 

analyzer sample probe.

Turn thermostat to closed position so appliance is 

activated.

Set appliance to high fire mode as described in “User 

Interface Quick Reference” section 10 page 21  and 

allow it to run for approximately 5 minutes.

Insert sample probe of your combustion analyzer into 

drilled hole from Step 8. Insert about halfway into 

exhaust gas stream. Take flue gas reading and observe 

% CO

2

 and CO values.  Adjust throttle screw until 

correct readings are reached. 

Turning throttle screw clockwise decreases rate and 

CO

2

 value. Turning throttle screw counter clockwise 

increases rate and CO

2  

value. 

Allow appliance to stabilize for one minute after 

adjusting throttle screw before you take reading with 

combustion analyzer.

CO levels should not exceed 80 ppm.

Set appliance to low fire mode as described in “User 

Interface Quick Reference” section. Check CO

2

 level as 

stated in Step 5. Low fire and high fire values should be 

approximately same.

After adjustments are made stop appliance. Disconnect 

pressure gauge, tighten inlet pressure tap on gas valve, 

remove CO

2

 meter from CPVC pipe, and seal hole with 

¼” NPT black iron plug. Use thread sealing compound 

or teflon tape to ensure proper seal.

Return thermostat switch to its original position.

Correct input rate is essential for proper and efficient 

operation of burner and boiler.

Determine elevation at installation site.

See “Installation, Operation and Maintenance Manual” 

to determine correct approximate input rate for local 

elevation.

Obtain yearly average heating value of local gas utility. 

At sea level elevation, it should be about 1000 BTU per 

standard cubic foot.

Operate boiler for 5 minutes.

Turn off all other gas appliances, extinguishing standing 

pilots where applicable.

At gas meter, measure time in seconds required to use 

one cubic foot of gas.

Boiler must be in high fire mode for this operation. See 

“User Interface Quick Reference” section 10, for more 

information on placing boiler in high fire mode. 

Calculate BTUH Input Rate as follows:

Measured input rate varies with vent length, gas 

calorific content, altitude and ambient temperature. 

Set boiler with combustion specifications in “Boiler 

Adjustment” section 6 page 9.

Determine LP gas input rate by measuring C0

2

 produced 

during combustion. Set this value according to guidelines 

table on page 11.

Flame sense can be indicator of issues with air intake 

venting, exhaust venting, burner and ignitor condition and 

supply gas piping pressure. 
Use multi meter capable of reading 0-20 VDC. 
Attach one lead to “F” terminal on low voltage terminal 

block on boiler control. 
Attach other lead to any ground surface on boiler. See 

Figure 2. 
Flame sense voltage shall be in accordance with values 

listed in Flame Signal Guidelines chart page 11.