Vent Table - Nordyne M2RC-080 Installation Instructions Manual

These
condensing furnaces are classified as
"Category IV" appliances, which require special
venting materials and installation procedures.
Category IV appliances operate with positive
vent pressure and therefore require vent
systems which are thoroughly sealed. They
also produce combustion condensate, which
is slightly acidic and can cause severe
corrosion of ordinary venting materials.
Furnace operation can be adversely affected
by restrictive vent and combustion air piping.
Therefore, vent and combustion air piping
lengths must conform completely to the
requirements of Table 6.
The furnace must be vented to the outdoors.
It must not be vented in common with any other
appliance, even if that appliance is of the
condensing type. Common venting can result
in severe corrosion of other appliances or their
venting and can allow combustion gases to
escape through such appliances or vents. Do
not vent the furnace to a fireplace chimney or
building chase.
If removing an existing furnace in a venting
system, the venting system may not be propedy
sized. To test the vent system with'-the
remaining appliances, follow the test outlined
below.
The following steps shall be followed with each
appliance connected to the venting system place
in operation, while any other appliances con-
nected to the venting system are not in operation:
a. Seal any unused openings in the venting
system.
b. Inspect the venting system for proper
size and horizontal pitch, as required in
the National Fuel Gas Code, ANSI Z223.1
orthe CAN/CGA B149 Installation Codes
and these instructions. Determine that
there is no blockage or restriction,
leakage, corrosion and other deficiencies
which could cause an unsafe condition.
c. In so far as is practical, close all building
doors and windows and all doors between
the space in which the appliance(s)
connected to the venting system are
located and other spaces of the building.
Turn on clothes dryers and any other
appliance not connected to the venting
system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts,
so they shall operate at maximum speed.
Do not operate a summer exhaust fan.
Close fireplace dampers.
d. Follow the lighting instructions. Place
the appliance being inspected in
operation. Adjust thermostat so appliance
shall operate continuously.
e. Test for draft hood equipped appliance
spillage at the draft hood relief opening
after 5 minutes of main burner operation.
Use the flame of a match or candle.
f. After it has been determined that each
appliance connected to the venting
system properly vents when tested as
outlined above, return doors, windows,
exhaust fans, fireplace dampers and
any other gas burning appliance to their
previous conditions of use.
APPLICATION
PVC, CPVC or ABS
SCH. 40 Pipe Size
Model M2RL 060
Model M2RCIL 080
Model M2RC/L 100
DIRECT VENT, DUAL PIPE LENGTH (ft.)
with 1 long radius elbow on each pipe.*
Inlet/Outlet
3 ==
50
90
90
3 ID
5O
9O
9O
*NOTES
1. Subtract 3.5 ft. for each additional 3" elbow.
2. Two 45 degree elbows are equivalent to one 90 degree elbow.
3. One short radius elbow is equivalent to two long radius elbows.
4. Do not include termination elbows in calculation of vent length.
5. This table is applicable for elevations from sea level to 2000 ft. For higher elevations,
decrease vent pipe lengths by 8% per 1000 ft. of altitude.
6. Only the above pipe materials are approved for use with these condensing furnaces.
Table 6. Vent Table
12