Utica Boilers CuB Series Installationsanweisungen

• Unit is equipped with an advanced combustion air, vent 

fl ow control system, with modulating fan and pressure 

sensor.

• Unit automatically adapts its operation to fl ue type 

and length, without requiring adjustments during 

installation or use of baffl es in combustion circuit.

• Unit consistantly and automatically regulates 

combustion air and vent fl ow according to change in 

thermal load. Combustion and heat exchange occur in 

optimum conditions. Unit’s thermal effi ciency remains 

high throughout its power range.

• See Table 3

•  Use Type B vent pipe through crawl space. Where vent 

pipe passes through combustible wall or partition, use 

ventilated metal thimble. Thimble should be 4 inches 

larger in diameter than vent pipe.

•  Boiler installed with single wall vent, must have 6” 

clearance between its surface and any combustible 

material. New Type B gas vent or fl exible liner must be 

installed in accordance with instructions furnished with 

vent. Maintain clearances as specifi ed for vent pipe.

•  Verify vent pipe is fi re-stopped where it goes through 

fl oor or ceiling. It should have approved vent cap with 

clearances from roof. If clearances are less than shown, 

have vent checked by local authorities. Figure 13, Page 

20.

•  Vent connectors serving appliances vented by natural 

draft shall not be connected into any portion of 

mechanical draft systems operating under positive 

pressure.

When an existing boiler is removed from a common

venting system, common venting system is likely to be

too large for proper venting of the appliances remaining

connected to it.

At the time of removal of an existing boiler, the 

following steps shall be followed with each appliance 

remaining connected to the common venting system 

placed in operation, while the other appliance 

remaining connected to the common venting system 

are not in operation.

Seal any unused openings in the common venting   

system.

Visually inspect the venting system for proper size and 

horizontal pitch and determine there is no blockage or 

restriction, leakage, corrosion and other defi ciencies 

which could cause an unsafe condition.

Insofar as is practical, close all building doors and 

windows and all doors between the space in which the 

appliances remaining connected to the common venting 

system are located and other spaces of the building. 

Turn on clothes dryers and any appliance not connected 

to the common venting system. Turn on any exhaust 

fans, such as range hoods and bathroom exhausts, so 

they will operate at maximum speed. Do not operate a 

summer exhaust fan. Close fi replace dampers.

Place in operation the appliance being inspected. Follow 

the lighting instructions. Adjust thermostat so appliance 

will operate continuously.

Test for spillage at the draft hood relief opening after 

5 minutes of main burner operation. Use fl ame of a 

match or candle, or smoke from a cigarette, cigar, or 

pipe. 

After it has been determined that each appliance 

remaining connected to the common venting system 

properly vents when tested as outlined above, return 

doors, windows, exhaust fans, fi replace dampers and 

any other gas-burning appliance to their previous 

conditions of  use.

Any improper operation of the common venting system 

should be corrected so the installation conforms with 

the National Fuel gas Code, ANSI Z223.1/NFPA 54, 

and/or the Natural Gas and Propane Installation Code, 

CAN/CSA B149.1.  When re-sizing any portion of the 

common venting system, the common venting system 

should be re-sized to approach the minimum size 

determined using the appropriate tables in Chapter 13 

of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, 

and/or the Natural Gas and Propane Installation Code, 

CAN/CSA B149.1.

It is recommended that existing gas vents be checked 

to be sure they meet local codes.

Item

Material

Standards

Vent Pipe & Fittings

Type B Vent

UL 441, ULC S605

Masonry Chimney 

- must conform to 

proper sizing and 

materials

National Fuel 

Gas Code, ANSI 

Z223.1/NFPA 54

Combustion Air

Stainelss Steel, 

PVC, CPVC, PP, 

Aluminum

ANSI/ASTM 

D2564, ANSI/

ASTM F493, UL 

1738/ULC636-08