Utica Boilers MGB Series II/MGC Series 安装指导

12

When an existing boiler is removed from a common 

venting system, the system is likely to be too large for the 

proper venting of the appliances sill connected to it.  If 

this situation occurs, the following test procedure must be 

followed:

Vent pipe must slope upward from the boiler not

less then ¼ inch for every 1 foot (21mm/m) to vent

terminal.

Horizontal portions of venting system shall be

supported rigidly every 5 feet and at the elbows. No

portion of vent pipe should have any dips or sags.

Boiler series is classified as a Category I. Vent

installation shall be in accordance with "Venting of

Equipment," of the National Fuel Gas Code, ANSI

Z223.1/NFPA 54 or applicable provisions of the local

building codes.

Inspect chimney. Verify chimney is constructed

according to NFPA 211. Vent or vent connector shall

be Type B or metal pipe having resistance to heat and

corrosion not less than that of galvanized sheet steel or

aluminum not less than 0.016 inch thick (No. 28 Ga).

Connect flue pipe from draft hood to chimney. Bolt or

screw joints together to avoid sags. Flue pipe should

not extend beyond inside wall of chimney. Do not

install manual damper in flue pipe or reduce size of

flue outlet except as provided by the latest revision of

ANSI Z223.13. Protect combustible ceiling and walls

near flue pipe with fireproof insulation. Where two or

more appliances vent into a common flue, the area of

the common flue must be at least equal to the area

of the largest flue plus 50 percent of the area of each

additional flue.

REMOVAL OF BOILER FROM VENTING SYSTEM
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 appliances remaining connected 

to the common venting system are not in operation.

Seal an unused opening 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 deficiencies

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 other appliance not

connected to the common venting system. Turn on

any exhaust fans, such as range hoods and bathroom

exhausts, so they operate at maximum speed. Do

not operate a summer exhaust fan. Close fireplace

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 the flame of

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

pipe.

After it has been determined that each appliance

remaining connected to a common venting system

properly vents when tested as outlined above, return

doors, windows, exhaust fans, fireplace dampers and

any other gas burning appliances to their previous

condition 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.

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.

Boiler and venting installations shall be performed 

by a qualified expert and in accordance with the 

appropriate manual. Installing or venting boiler 

or other gas appliance with improper methods or 

materials may result in serious injury or death due 

to fire or to asphyxiation from poisonous gases such 

as carbon monoxide with is odorless and invisible.

Do not connect boiler to any portion of mechanical 

draft system operating under positive pressure.