Lennox G26 series Installation Instructions Manual page 9

NOTE - -iTmeis cdtical at this stage. Do not allow pnm-
er to dry before applying cement.
7 - Immediately after applying last coat ofcement to pipe,
and while both inside socket surface and end of pipe
are wet with cement, forcefully insert end of pipe into
socket until it bottoms out. Tum pipe 1/4 turn dudng as-
sembly (but not after pipe is fully inserted) to distribute
cement evenly.
NOTE-Assembly should be completed within 20 sec-
onds after last application of cement. Hammer blows
should not be used when inserting pipe.
8 - After assembly, wipe excess cement from pipe at end
of fitting socket. A properly made joint will show a
bead around its entire perimeter. Any gaps may indi-
cate a defective assembly due to insufficient solvent.
9 - Handle joints carefully until completely set.
The thickness of construction through which vent/air intake
pipes may be installed is a minimum of 3 inches (610 mm),
and a maximum of 24 inches (610mm). If a G26 furnace re-
places a fumace which was commonly vented with another
gas appliance, the size of the existing vent pipe for that gas
appliance must be checked. Without the heat of the odginal
furnace flue products, the existing vent pipe is probably
oversized for the single water heater or other appliance.
The vent should be checked for proper draw with the re-
maining appliance.
1 - Cement intake piping in slip connector located at top
of unit.
2 - Route piping to outside of structure. Continue with
installation following instructions given in exhaust and
intake piping termination section.
Exhaust Piping
1 - Cement exhaust piping into flue collar socket located
on the left side of the top cap.
2 - All horizontal runs of exhaust pipe must slope back to-
ward unit. A minimum of a 1/4 inch (6mm) drop for each
12 inches (305mm) of horizontal run is mandatory for
drainage. Horizontal runs of exhaust piping must be
supported every 5 feet (1.52m) using hangers.
NOTE - Exhaust piping should be checked carefully to
make sure there are no sags or low spots.
NOTE - Exhaust piping must be insulated with 1/2 inch
(13mm) Armaflex or equivalent when run through un-
heated space. Do not leave any area of exhaust pipe
open to outside air; exterior exhaust must be insulated
with 1/2 inch (13mm) Armaflex or equivalent.
A WARNING
Intake Piping
CAUTION
Removal of Unit from Common Venting System
In the event that an existing furnace is removed from a
venting system commonly run with separate gas ap-
pliances, the venting system is likelyto be too large to prop-
edy vent the remaining attached appliances. The following
test should be conducted while all appliances (both in op-
eration and those not in operation) are connected to the
common venting system. If the venting system has been
installed improperly, corrections must be made as outlined
in the previous section.
1 - Seal any unused openings in the common venting sys-
tem.
2 - Visually inspect the venting system from proper size
and horizontal pitch and determine there is no block-
age or restdction, leakage, corrosion and other deft-
ciencies which could cause an unsafe condition.
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