8
CONCENTRIC VENT ROOF INSTALLATION
Figure 5
FOUNDATION REQUIREMENTS
Boiler must be placed on level surface. Boiler is
NOT to be installed on carpeting.
NOTES
1. If boiler is not level condensate drain lines will not function
properly. Adjustable feet are located on the boiler to make
up for minor surface irregularities or tilt.
2. Wood frame or blocks may be used to raise boiler to maintain
drain pitch or to be above external condensate pump reservoir.
REMOVAL OF EXISTING BOILER
FROM COMMON VENT 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 steps shall be fol-
lowed 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 or
other deficiencies which could cause an unsafe
condition.
3. When it 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 oth-
er spaces of the building. Turn on clothes dryer
and any appliance not connected to the common
venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhaust, so they
will operate at maximum speed. Do not operate
a summer exhaust fan. Close fire dampers.
4. Place in operation the appliance being in-
spected. Follow the lighting instructions. Adjust
thermostat so appliances will operate continu-
ously.
5. Test for spillage at the draft hood relief open-
ing after 5 minutes of main burner operation. Use
the flame of a match or candle, or the smoke
from a cigarette, cigar or pipe.
6. After it has been determined that each ap-
pliance remaining connected to the common
venting system properly vents when tested as
outlined above, return doors, windows, exhaust
fans and any other gas-burning appliance to their
previous condition of use.
7. Any improper operation of the common vent-
ing system should be corrected so the installation
conforms with the National Fuel Code, NFPA-
54/ANSI -Z223.1-latest revision, or section 5 of
CSA-B149 for Canadian standards. When resiz-
ing 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 in the National
Fuel Gas Code, NFPA-54/ANSI- Z223.1-latest
revision, or section 5 of CSA-B149 for Canadian
standards.
