Install Instructions

42
APPENDIX B – VENTING
VENT THIS BOILER according to the instructions. Failure to do so may cause products of
combustion to enter the building resulting in severe property damage, personal injury or death.
FAILURE TO INSTALL a condensate drain line could cause boiler to shutdown unexpectedly.
i
Install this boiler according to this manual and the National Fuel Gas Code, ANSI Z223.1/NFPA
54, or applicable provisions of the local building codes. Contact local building or fire officials about
restrictions and installation inspection in your area.
This Appendix consists of two sections (B2, and B3). Refer to the section appropriate for the type of boiler
you are installing or servicing.
B2 Direct Vent “Direct vent” is also called “sealed combustion”. All combustion air is drawn from outside
the building directly into the boiler. The boiler vents vertically or horizontally, assisted by a fan in the
boiler. Gas vent must resist temperature and corrosion and be sealed against leakage of ue gases and
condensate. Approved materials include AL29-4C stainless steel. Combustion air provided by a separate
PVC or galvanized steel pipe.
B3 Power Vent Similar to Direct Vent, but combustion air supplied from inside the building.
Vent connectors serving appliances vented by natural draft shall not be connected into any portion of
mechanical draft systems operating under positive pressure.
IF AN EXISTING BOILER IS REMOVED
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 to it.
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 de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 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 5 minutes of main burner
operation. Use the 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, 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,
ANSI Z223.1/NFPA 54. 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 Chapter 13 of
the National Fuel Gas Code, ANSI Z223.1/
NFPA 54.