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16 18-CD22D1-8
Installer’s Guide
HORIZONTAL INSTALLATION
(Upflow/ Horizontal or Downflow/ Horizontal)
NOTE:
In horizontal venting when the factory supplied “off-
set” (2X3 reducing coupling) is used for 3” vent pipe
installation, make sure the marking “Top” is located on
the top side of the pipe. The straight side must be on
bottom for proper condensate drainage. This coupling
is factory supplied only with the following models:
*UC120 & *DC120, *UX120 & *UY120 *UX100 & *UY100,
*UX808C960, and all *DX & *DY models.
Connection of the pipe and collar of the combustion
air inlet should just be a friction fit. It is recommended
that the inlet air joint be sealed with RTV type sealant
to allow the joint to be separated for possible future ser-
vice. The inlet and vent pipes must be properly sup-
ported throughout the entire length.
Connection of the vent pipe to the vent collar should
also be accomplished using RTV type sealant. This type
sealant provides a connection which remains flexible
and can be separated in the future if service needs re-
quire the removal of the vent pipe for service or clear-
ance.
NOTE:
To ensure proper operation at the vent lengths indi-
cated, the combustion air inlet and vent terminals
should be in the same pressure zone. Terminating the
vent and inlet in different pressure zones will change
the maximum vent lengths and may cause nuisance
tripping of the pressure switch(es). The amount of
change can not be predicted. The selection of the inlet
and outlet terminal locations are the responsibility of
the designer/installer. If the installer chooses separate
pressure zones for the terminals, the combustion air
inlet termination must be in the higher (more positive)
pressure zone.
HORIZONTAL VENTING
NOTE:
Vent termination kit BAYAIR30AVENTA or
BAYVENT200B may be used instead of the horizontal
and vertical termination options shown in the follow-
ing figures.
NOTE:
Follow venting instructions carefully when using PVC
cement.
IMPORTANT:
All joints must be water tight. Flue condensate is some-
what acidic, and leaks can cause equipment damage.
p
Seal VENT PIPE
with RTV sealant
Seal INLET AIR PIPE
with RTV sealant
Front of Furnace
VENT AND INLET AIR CONNECTIONS
LABEL
SAYS
"TOP"
STRAIGHT SIDE MUST BE
ON BOTTOM FOR PROPER
CONDENSATE DRAINAGE.
WHEN THE FACTORY SUPPLIED "OFF-SET" (2X3
REDUCING COUPLING) IS USED FOR 3" VENT PIPE
INSTALLATION, MAKE SURE THE MARKING "TOP" IS
LOCATED ON THE TOP SIDE OF THE PIPE.
2" TO 3" COUPLING
FURNACE
VENT
OUTLET
FACTORY SUPPLIED ONLY
WITH THE FOLLOWING
MODELS:
UC120 & DC120
UX120 & UY120
UX100 & UY100
UX080C960
ALL DX & DY MODLES
UX3 & DX3
UH3 & DH3
#CPL00838
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