Vent Damper Operation - Dunkirk PWXL Installation, Operation & Maintenance Manual

crawl space, double wall vent pipe should be used Where vent pipe
passes through a combustible wall or partition, use a ventilated
metal thimble. The thimble should be 4" larger in diameter than the
vent pipe.
Minimum Vent Pipe Clearance
Wood and other combustible materials must not be closer than 6"
from any surface of single wall metal vent pipe. Listed Type B vent
pipe or other listed venting systems shall be installed in accordance
with their listing.
REMOVING 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 vent-
ing of the appliances remaining connected to it.
At the time of removal of an existing boiler, the following steps shall
be followed with each appliance remaining connected to the com-
mon 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 hori-
zontal 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
Typical Installation For Vent Damper
Install the vent damper to service only the single appliance
!
for which it is intended. If improperly installed, a hazard-
ous condition, such as an explosion or carbon monoxide
poisoning, could result.
Do not install the vent damper on pipe curve.
Do not run wires near high temperature surfaces. Use standoff
brackets if necessary.
ChimNEy ANd VENT pipE CONNECTiON

VENT dAmpEr OpErATiON

WARNING
spaces of the building. Turn on clothes dryers and any appli-
ance 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 sum-
mer exhaust fan. Close fireplace dampers.
4. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so appliance will oper-
ate 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 National Fuel
Gas Code, ANSI Z223.1-latest revision. When re-sizing any
portion of the common venting system, the common venting
system should be re-sized to approach the minimum size as
determined using the appropriate tables in the National Fuel
Gas Code, ANSI Z223.1-latest revision.
Vent connectors serving appliances vented by natural draft
shall not be connected into any portion of mechanical
draft systems operating under positive pressure.
For safe, efficient operation, the vent damper and all flue product
carrying areas of the appliance must be checked annually by you,
with particular attention given to deterioration from corrosion or
other sources. If you see corrosion or other deterioration, contact
your heating contractor for repairs. Check vent damper operation as
follows:
1. When the boiler is off, check that the vent damper positions
indicator points to the closed position, Fig. 14.
2. Turn the thermostat or controller up to call for heat and check
the vent damper indicator points to the open position, Fig. 14.
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NOTICE