506887-01
Page 15 of 78
Issue 1213
NOTE:
T
he exhaust collar on all models is sized to
accommodate 2” Schedule 40 vent pipe. In horizontal
applications, transition to exhaust pipe larger than 2” must
be made in vertical runs of the pipe. A 2” elbow must be
added before the pipe is transitioned to any size larger than
2”. This elbow must be added to the elbow count used to
determine acceptable vent lengths. Contact Allied Air
Technical Service for more information concerning sizing of
vent systems which include multiple pipe sizes.
EXHAUST PIPE
Figure 16
Horizontal Application
NOTE:
All horizontal runs of exhaust pipe must slope back toward
unit. A minimum of 1/4” (6 mm) drop for each 12” (305 mm) of
horizontal run is mandatory for drainage.
NOTE:
Exhaust pipe MUST be glued to furnace exhaust fittings.
NOTE
:
Exhaust piping should be checked carefully to make sure
there are no sages or low spots.
* Any approved termination may be added to the minimum equivalent
length listed.
MINIMUM VENT PIPE LENGTHS
Table 4
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
IMPORTANT
2.
Inspect the venting system for proper size and horizontal
pitch. Determine that there is no blockage, restriction,
leakage, corrosion, or other deficiencies which could
cause an unsafe condition.
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, windows, 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 problems.
Resize the common venting system to the minimum vent
pipe size determined by using the appropriate tables in
the current standards of the National Fuel Gas Code
ANSI Z223.1.
Vent Piping Guidelines
This unit is installed only as a Direct Vent gas central
furnace.
NOTE:
In Direct Vent installations, combustion air is taken
from outdoors 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 more information
concerning sizing of vent systems which include multiple
pipe sizes.
Use the steps in Figure 17 to correctly size vent pipe
diameter.
Summary of Contents for A97USMV
Page 3: ...506887 01 Page 3 of 78 Issue 1213 A97USMV Exploded View Figure 1 ...
Page 16: ...506887 01 Page 16 of 78 Issue 1213 Figure 17 ...
Page 28: ...506887 01 Page 28 of 78 Issue 1213 Trap Drain Assembly using 1 2 PVC or 3 4 PVC Figure 38 ...
Page 35: ...506887 01 Page 35 of 78 Issue 1213 ...
Page 36: ...506887 01 Page 36 of 78 Issue 1213 Figure 46 ...
Page 39: ...506887 01 Page 39 of 78 Issue 1213 ...
Page 40: ...506887 01 Page 40 of 78 Issue 1213 Typical A97USMV Wiring Diagram Figure 47 ...
Page 41: ...506887 01 Page 41 of 78 Issue 1213 Integrated Control Figure 48 ...
Page 42: ...506887 01 Page 42 of 78 Issue 1213 Low Voltage Field Wiring Table 14 2 Stage Single Stage ...
Page 46: ...506887 01 Page 46 of 78 Issue 1213 BLOWER DATA ...
Page 47: ...506887 01 Page 47 of 78 Issue 1213 BLOWER DATA ...
Page 48: ...506887 01 Page 48 of 78 Issue 1213 BLOWER DATA ...
Page 49: ...506887 01 Page 49 of 78 Issue 1213 BLOWER DATA ...
Page 50: ...506887 01 Page 50 of 78 Issue 1213 BLOWER DATA ...
Page 51: ...506887 01 Page 51 of 78 Issue 1213 BLOWER DATA ...
Page 52: ...506887 01 Page 52 of 78 Issue 1213 BLOWER DATA ...
Page 53: ...506887 01 Page 53 of 78 Issue 1213 BLOWER DATA ...
Page 54: ...506887 01 Page 54 of 78 Issue 1213 BLOWER DATA ...
Page 55: ...506887 01 Page 55 of 78 Issue 1213 TABLE 22 ...
Page 56: ...506887 01 Page 56 of 78 Issue 1213 TABLE 23 ...
Page 60: ...506887 01 Page 60 of 78 Issue 1213 Figure 50 ...
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