Lennox G26 series Installation Instructions Manual page 14

G26 VENTING IN EXISTING CHIMNEY
c_x1_ n_r
or vent stack. If verti-
cal discharge through an existing unused chimney or stack is required, insert piping
inside chimney un_l the pipe open end is above top of chimney and terminate as illuS-
trated. In any exteriorper6on of chimney, Itm exhaust vent must be insulated. An aHer-
hate method is to fill the chimney w_h ¥emliculita or equal to take advantage of its
acoustic and thermal properties.
FIGURE 20
Condensate Piping
This unit is designed for either dght- or left-side exit of con-
densate piping. Condensate drain line should be routed
only within the conditioned space to avoid freezing of con-
densate and blockage of drain line, An electric heat cable
should be used where condition is exposed to uncondi-
tioned areas.
A CAUTION
1 - Determine which side condensate will exit the unit.
2 - Connect a 1/2 inch (13mm) plastic pipe plug (provided)
in the unused end ofthe condensate trap, Installplug so
that it is sealed water tight yet able to be removed. Do
not permanently seal the connection. Teflon tape is rec-
ommended to seal joint. See figure 21.
CONDENSATE ASSEMBLY
(Forleftor rlghtInstallation)
COMBUSTION AIR
INDUCER BRACKET
COLD HEADER
BOX
NIPPLE
ADAPTER
NIPPLE
ADAPTER
CONDENSATE TRAP
PLUG BOOT OR CAP
FIGURE 21
3 - Use the provided adapter (1/2 inch PVC x 1/2 inch
MPT) and the nipple (1/2 inch PVC) to carry drainage
outside the cabinet. If a field substitute is needed, 1/2
inch CPVC x 1/2 inch MPT adapter and 1/2 inch CPVC
is acceptable for use.
4 - Glue nipple to the adapter using the procedures out-
lined in the "Joint Cementing Procedures" section.
The nipple/adapter assembly should be connected in
a non-permanent manner and must be water tight.
Teflon tape is recommended to seal the joint.
For Right-Hand Side Condensate Exit:
Install the nipple/adapter assembly from the outside
of the cabinet and insert the adapter into the threaded
opening in the condensate trap.
For Left-Hand Side Condensate Exit:
Insert nipple/adapter assembly from the left hand
side of the cabinet and through the combustion air
inducer mounting structure into the threaded open-
ing in the condensate trap.
5 - Connect field supplied plumbingto nipple and route to
open drain. Plumbing shouldbe vented to a point higher
than the condensing coil. See figure 22.
CONDENSATE PLUMBING
(Plumbing must be vented higher than coil.)
_
FIGURE 22
Connect condensate drain line (1/2 inch [13mm] SDR
11 plastic pipe or tubing) to condensate connection on
drip leg assembly and route to open drain. Conden-
sate line must be sloped downward away from drip leg
to drain. If drain level is above drip leg, condensate
pump must be used to condensate line. Condensate
drain line should be routed within the conditioned
space to avoid freezing of condensate and blodkage of
drain line. If this is not possible, a heat cable kit may be
Page 14