Airease 95G2UHV Installation Instructions Manual - page 17
506878-01
Page 17 of 62
Issue 1139
3. Close all building doors and windows and all doors
between the space in which the appliances remaining
connected to the common venting system are located
and other spaces of the building. Turn on clothes dryers
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
operate at maximum speed. Do not operate a summer
exhaust 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
dampers, and any other gas burning appliances to their
previous mode of operation.
7. If a venting problem is found during any of the preceding
tests, the common venting system must be modified 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
standards of the National Fuel Gas Code ANSI Z223.1.
Figure 19
If this gas furnace replaces a furnace 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 original
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 remaining appliance.
The exhaust vent pipe operates under positive pressure
and must be completely sealed to prevent leakage of
combustion products into the living space.
CAUTION
Exhaust Piping
Route piping to outside of structure. Continue with installation
following instructions given in piping termination section.
Do Not
discharge exhaust into an existing stack or stack
that also serves another gas appliance. If vertical
discharge through an existing unused stack is required,
insert PVC pipe inside the stack until the end is even
with the top or outlet end of the metal stack.
CAUTION
Vent Piping Guidelines
This gas furnace can be installed as either Non-Direct
Vent or a Direct Vent gas central furnace.
NOTE:
In Non-Direct Vent installations, combustion air is
taken from indoors and flue gases are discharged outdoors.
Intake and exhaust pipe sizing
- Size pipe according to Tables
4 and 5. Table 4 lists the
minimum
vent pipe lengths
permitted. Table 5 lists the
maximum
pipe lengths permitted.
Regardless of the diameter of pipe used, the standard roof
and wall terminations described in section
Exhaust Piping
Terminations
should be used. Exhaust vent termination pipe
is sized to optimize the velocity of the exhaust gas as it exits
the termination. Refer to Table 6.
In some applications which permit the use of several different
sizes of vent pipe, a combination vent pipe may be used.
Contact Allied Air Technical Service for assistance in sizing
vent pipe in these applications.
NOTE:
The exhaust collar on all models is sized to
accommodate 2” Schedule 40 vent pipe. When vent pipe
which is larger than 2” must be used in an upflow application,
a transition must be applied at the exhaust collar in order to
properly step to the larger diameter vent pipe. Contact Allied
Air Technical Service for more information concerning sizing
of vent systems which include multiple pipe sizes.