Optional Horizontal Venting Instruction - Dunkirk XEB-2 Installation, Operation & Maintenance Manual

10. If the horizontal vent must go through a crawl space or other
unheated space, the cool temperatures will likely cause the flue
gases to continuously condense inside the vent pipe. Do not
insulate the vent pipe. It must be visible for monthly inspec-
tion. Insure that the vent pipe is properly pitched away from
the boiler, with no low spots, so that condensate in the vent will
drain away from the boiler. An insulated enclosure or chase,
with access for inspection and servicing of the vent, may be
Horizontal venting with a power venter is an alternate method of
sidewall venting. This boiler is CSA listed for sidewall venting with
standard single wall galvanized or Type B vent pipe when using the
following power venter kits, which were specifically sized for these
boilers:
Number Of
Boiler Sections
2, 3, 4, 5
6, 7
Some possible reasons for using a power venter for sidewall venting:
1. May be preferred by local codes.
2. Need a vent piping run beyond 30' (but not more than 50').
3. The boiler installation site experiences gusting or high winds. A
power venter can help prevent the boiler from short cycling due
to gusting or high winds by providing vent exhaust pressures
greater than the boiler's induced draft blower alone.
4. When installers or homeowners prefer a negative pressure vent
system instead of a positive pressure vent system.
5. May be more cost effective than stainless steel
venting, particularly at longer vent lengths.
The Field Controls power vent kit includes either a SWG-II-
4HD or SWG-II-5 power venter, a MG-1 4" barometric draft
controller, and the CK-43D controls kit.
Confirm that installing a power venter is an option allowed by local
HOrIZONTAL VENTINg INSTruCTIONS

OpTIONAL HOrIZONTAL VENTINg INSTruCTION

Table 6
Field Controls
Power Venter
SWG-4D
SWG-5D
required to prevent freezing of liquid condensate. Consult the
vent pipe manufacturer's instructions for specific guidelines.
11. At the beginning of each heating season and monthly during
the heating season, check all vent pipes and the vent terminal
to make sure there are no obstructions. Periodically clean the
screen in the vent terminal.
codes. Follow the specific power venter installation instructions
issued with the power venter kits. Although the power venter is
equipped with its own fan, the fan on the boiler remains in place and
is unaltered when a power venter is used.
When sidewall venting, flue gases must be vented to a point in rela-
tion to the prevailing wind so that they may freely disperse without
being blown back at the building causing discoloration, or into the
building through doors or windows causing odors. Also, under cer-
tain conditions flue gases will condense, forming moisture. In such
cases, steps should be taken to prevent building materials at the vent
terminal from being damaged by the exhausted flue gas.
When installing single wall galvanized vent pipe for power venting
follow the specific power venter installation instructions for layout,
location of the barometric draft control and termination connec-
tions.
When joining and sealing the single wall galvanized or Type B vent
piping, use RTV silicone sealant with a minimum temperature rating
of 400°F. For 3" vent pipe runs, begin with the female end of the vent
pipe over the boiler's induced draft blower outlet. For 4" vent pipe
runs begin with the galvanized 3" to 4" increaser fitting (included in
the boiler's parts bag) over the induced draft blower outlet. Then fol-
low by placing the female end of the 4" vent pipe over the increaser
fitting.
When joining pieces of single wall galvanized vent pipe, a substan-
tial bead of silicone should be used at the joint to insure a leakproof
connection.
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