Burnham PVG Installation, Operating And Service Instructions Download Page 11

Page: 11 / 68

Vent Guidelines Due to Removal of an Existing
Boiler

For installations not involving the replacement of an
existing boiler, proceed to Step B.

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 remaining
appliances. 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:

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 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

fireplace dampers.

4. Place in operation the appliance being inspected.

Follow the Lighting (or Operating) Instructions.
Adjust thermostat so appliance will operate
continuously.

5. Test for spillage at the draft hood relief opening

after five (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

National Fuel Gas Code

, NFPA

54/ANSI Z223.1. 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 II in the

National Fuel Gas Code

, NFPA 54/

ANSI Z223.1.

General Guidelines

1. Vent system installation must be in accordance

with

National Fuel Gas Code

, NFPA 54/ANSI

Z221.3 or applicable provisions of local building

codes. Contact local building or fire officials about

restrictions and installation inspection in your area.

2. Refer to the appropriate drawings in this section of

this manual to determine the proper configuration of

venting system. See Table 1.

3. This appliance requires a Special Gas Vent. The product

is designed to use U.S. Boiler supplied AL29-4C

Stainless Steel vent system components. The following
manufacturers offer similar AL 29-4C

components

and are approved for use with this product. Heat-Fab
Inc. - Saf-T-Vent (800-772-0739); Flex-L International
Inc.  -  Star-34  (800-561-1980);  Z-Flex  U.  S.,  Inc.
- Z-Vent (800-654-5600); and Protech Systems, Inc.-
FasNSeal™  (800-766-3473)  or  equivalent.  The  use
of these alternate manufacturer’s venting systems will
require adapters to connect to the U.S. Boiler supplied
vent connector and vent terminal.  These adapters are
not supplied with this unit and should be obtained from
the  supplier  of  the  alternate  manufacturer’s  venting
system.  See Table 3 for complete list of U.S. Boiler
Vent System Components.

4. Horizontal vent pipe must maintain a minimum ¼

inch per foot slope away from boiler.

5. Use noncombustible ¾ inch pipe strap to support

horizontal runs and maintain vent location and
slope while preventing sags in pipe. Do not restrict
thermal expansion or movement of vent system.

Maximum support spacing is five (5) feet. Do not

penetrate any part of the vent system with fasteners.

6. Vent length restrictions are based on equivalent

length of vent pipe (total length of straight pipe

plus equivalent length of fittings). Maximum

vent lengths are listed in Table 4. Do not exceed
maximum vent lengths. Table 3 lists equivalent

lengths for fittings. Do not include vent terminals in

equivalent feet calculations.

7. Provide and maintain vent pipe minimum clearances

to combustible materials. Vent pipe minimum
clearance to combustible material is four (4) inches
when vent is installed in a fully enclosed (chase)
application or three (3) inches when vent is installed
with at least one side open, similar to a joist bay
application. Use double wall thimble [U.S. Boiler
Part No. 8116115 (3”), 100185-01 (4”)] when
penetrating a combustible wall.

8. Do not install venting system components on

the exterior of the building except as specifically

required by these instructions. The vent termination
location is restricted as follows: