Burnham SCG - Manual (Page 10)

10
A. 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
defi ciencies 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 maxi mum
speed. Do not operate a summer exhaust fan. Close
fi replace dampers.
4. Place in operation the appliance being inspected.
Follow the Lighting (or Operating) Instructions.
Adjust thermo stat so appliance will operate
continuously.
5. Test for spillage at the draft hood relief opening
after fi ve (5) minutes of main burner operation. Use
the fl ame of a match or candle, or smoke from a
cigarette, cigar or pipe.
6. After it has been determined that each appliance
remain ing connected to the common venting system
properly vents when tested as outlined above, return
doors, win dows, exhaust fans, fi replace 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.
B. 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 fi re offi cials about
restrictions and installation inspection in your area.
2. The SCG is designed to be installed as either
a Direct Vent boiler or Power Vent boiler. In
the Direct Vent confi guration all of the air for
combustion is supplied directly to the burner
enclosure from outdoors and fl ue gases are vented
directly outdoors (through wall or roof). In the
Power Vent confi guration, room air provides air
for combustion and ventilation. Flue gases are still
vented directly outdoors (through wall or roof).
Note: Venting requirements change if indoor air is
used.
3. Refer to the appropriate drawings in this section of
this manual to determine the proper confi guration of
venting system. See Table 1.
4. This appliance requires a Special Gas Vent. The
product is designed to use Burnham supplied
AL 29-4C
® 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, Flex-L
International Inc. - Star-34, Z-Flex U. S., Inc. -
Z-Vent, and Protech Systems , Inc.- FasNSeal™ or
equivalent. The use of these alternate manufacturer’s
venting systems will require adapters to connect
to the Burnham 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 Burnham Vent System
Components.
5. Horizontal vent pipe must maintain a minimum ¼
inch per foot slope down towards boiler.
6. 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 fi ve (5) feet. Do not
penetrate any part of the vent system with fasteners.
7. Vent length restrictions are based on equivalent
length of vent/air pipe (total length of straight
pipe plus equivalent length of fi ttings). Maximum
vent/air lengths are listed in Table 4. Do not exceed
maximum vent/air intake lengths. Table 3 lists
equivalent lengths for fi ttings. Do not include vent/
air terminals in equivalent feet calculations.
8. 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