Venting Practices - Lennox EL296UHV Installation Instructions Manual

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 indicate an
improper assembly due to insufficient solvent.
9 - Handle joints carefully until completely set.

Venting Practices

Piping Suspension Guidelines
SCHEDULE 40
PVC - 5'
all other pipe* - 3'
* See table 2 for allowable pipe.
NOTE - Isolate piping at the point where it exits the outside wall or
roof in order to prevent transmission of vibration to the structure.
NOTE - All horizontal runs of exhaust pipe must slope back to­
ward unit a minimum of 1/4" (6mm) drop for each 12" (305mm).
Wall Thickness Guidelines
24" maximum
3/4" minimum
inside
FIGURE 20
1 - In areas where piping penetrates joists or interior
walls, hole must be large enough to allow clearance on
all sides of pipe through center of hole using a hanger.
2 - When furnace is installed in a residence where unit is
shut down for an extended period of time, such as a
vacation home, make provisions for draining conden­
sate collection trap and lines.
Removal of the Furnace from Common Vent
In the event that an existing furnace is removed from a
venting system commonly run with separate gas ap­
pliances, the venting system is likely to be too large to prop­
erly vent the remaining attached appliances.
Wall
outside
Conduct the following test while each appliance is operat­
ing and the other appliances (which are not operating) re­
main connected to the common venting system. If the vent­
ing system has been installed improperly, you must
correct the system as indicated in the general venting re­
quirements section.
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon mon­
oxide poisoning or death.
The following steps shall be followed for each ap­
pliance connected to the venting system being
placed into operation, while all other appliances
connected to the venting system are not in
operation:
1 - Seal any unused openings in the common venting sys­
tem.
2 - Inspect the venting system for proper size and horizon­
tal pitch. Determine that there is no blockage, restric­
tion, leakage, corrosion, or other deficiencies which
could cause an unsafe condition.
3 - Close all building doors and windows and all doors be­
tween the space in which the appliances remaining
connected to the common venting system are located
and other spaces of the building. Turn on clothes dry­
ers and any appliances not connected to the common
venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they will oper­
ate at maximum speed. Do not operate a summer ex­
haust fan. Close fireplace dampers.
4 - Follow the lighting instructions. Turn on the appliance
that is being inspected. Adjust the thermostat so that
the appliance operates continuously.
5 - After the main burner has operated for 5 minutes, test
for leaks of flue gases at the draft hood relief opening.
Use the flame of a match or candle.
6 - After determining that each appliance connected to the
common venting system is venting properly, (step 3)
return all doors, widows, exhaust fans, fireplace damp­
ers, and any other gas-burning appliances to their pre­
vious mode of operation.
7 - If a venting problem is found during any of the preced­
ing tests, the common venting system must be modi­
fied to correct the problem.
Resize the common venting system to the minimum
vent pipe size determined by using the appropriate
tables in Appendix G. (These are in the current stan­
dards of the National Fuel Gas Code ANSI Z223.1.
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