LINER

CHIMNEY

THIMBLE

VENT SYSTEM

CLEANOUT

THE VENT PIPE MUST BE AT LEAST 2 FT HIGHER THAN ANY PART OF THE ROOF WITHIN A 10 FT RADIUS OF THE VENT.

2' MIN

3' MIN

SHEET METAL

FIRESTOP

 

 

A95196

 

Fig. 5ÐType-B Gas Vent

 

Table 4ÐBoiler and Power Venter

 

 

 

BOILER SIZE (SEC-

 

FIELD CONTROLS

TIONS)

 

POWER VENTER KIT

2, 3, 4, 5

 

SWG-4D

6, 7

 

SWG-5D

 

 

 

For boilers with connections to gas vents or chimneys, vent installations shall be in accordance with Part 7 NFGC, Venting of Equipment, in the United States or Part 7 NSCNGPUC, Venting System and Air Supply for Appliances in Canada, and applicable provisions of local building codes.

Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.

PROCEDURE 3ÐREMOVING EXISTING BOILER FROM COMMON VENTING SYSTEM

When an existing boiler is removed from a common venting system, the 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 items 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.

1.Seal any unused openings in the common venting system.

2.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.

3.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 appliances 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 fireplace dampers.

4.Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.

5.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.

6.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, fireplace dampers, and any other gas-burning appliance to their previous conditions of use.

7. Any improper operation of the common venting system should be corrected so the installation conforms with the NFGC. When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined using the appropriate tables in Part 11 of the NFGC in the United States or Appendix B or the NSCNGPIC in Canada.

NOTE: It is recommended that existing gas vents be checked to be sure they meet local codes.

OPTIONAL HORIZONTAL VENTING WITH POWER VENTER

Horizontal venting with a power venter is an alternate method of sidewall venting. This boiler is A.G.A. and C.G.A. listed for sidewall venting with standard single wall galvanized or Type-B vent pipe when using 1 of the power venter kits listed in Table 4. These kits are specifically sized for these boilers.

Some possible reasons for using a power venter for sidewall venting:

1.May be preferred by local codes

2.Need a vent piping run beyond 30 ft (but not more than 50 ft)

Ð9Ð

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National Products BW3 ÐBoiler and Power Venter, Optional Horizontal Venting with Power Venter, Ð9Ð, Power Venter KIT

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