Dunkirk XEB-2 Installation Instructions Manual page 17

d) ProTechstainless steel vent piping requires
one loose fitting FasNSeal support strap
(#FSSH) for every 6' of horizontal vent.
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 insidethe vent pipe.
Do not insulate the vent pipe. It must be visible
for monthly inspection. Insure that the vent
pipe is properly pitched away from the boiler,
with no low spots, so that condensate in the
11.
ventwill drainawayfrom the boiler.An insulated
enclosure or chase, with access for inspection
and servicing of the vent, may be required to
prevent freezing of liquid condensate. Consult
the vent pipe manufacturer's instructions for
specific guidelines.
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.
Horizontal venting with a power venter is an
alternate method of sidewall venting. This boilers
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 Field Controls
Boiler Sections Kit Power
Venter
2, 3, 4, 5 SWG-4D
6, 7 SWG-5D
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 homeowner's 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 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 relation 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 certain
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
connections. 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 follow by
placing the female end of the 4" vent pipe over
the increaser fitting. When joining pieces of single
wall galvanized vent pipe, a substantial bead of
silicone should be used at the joint to insure a
leakproof connection.
16