Vent Freezing Protection; Drainage Of Condensate; From Furnace - Nordyne M2RC-080 Installation Instructions Manual

Vent Configuration to
Provide 12" Minimum
height above
Snow
LeveE.
_. 12" Min,
19" Max.
Out,ide Su po.
wa,, •
_ 1/2"
_ Armaflex
i _ Insulationor
Equivalent
-- 12" Above
Normally
Expected
Snow
Level
ExhaustVent
Op_on B _
Figure 17. Alternate Horizontal
Vent Installation
roof penetration must be properly flashed and
waterproofed with a plumbing roof boot or equiva-
lent flashing. Termination spacing requirements
from the roof and from each other must be per
Figure 19.
Figure 18. Exhaust and Combustion
Air Pipe Clearances
below freezing, i.e., installation within a pre-
existing masonry chimney; the pipe must be
insulated with 1/2 inch thick sponge rubber
insulation, such as an Armaflex-type or equiva-
lent.
Vent and combustion air piping may be in-
stalled in an existing chimney which is not in
use provided that:
a. Both the exhaust vent and air intake run
the length of the chimney.
b. The top of the chimney is sealed and
weatherproofed.
c. The termination clearances shown in
Figure 19 are maintained.
d. No other gas fired appliances are vented
through the chimney.
Vent Freezing Protection
To prevent condensate icing over extended
runs of vent pipe exposed to temperatures
Exhaust
; Vent's.
Combustion
Air
Exhaust
Plumbing Vent
Roof Boot
('ryp, Both Pipes)
i
A= 12"AboveRoofor SnowAccumulationLevel
Figure t9. Vertical Vent Termination
For extremely cold climates or for conditions of
short furnace cycles (i.e. set back thermostat
conditions) the last three feet of vent pipe can
be reduced one nominal pipe size provided that
the total vent length is at least 15 feet in length
and the vent is sized in accordance with the
venting requirements (Table 4) before this re-
duction isapplied. (Example: 3"to2-1/2") Smaller
vent pipes are less susceptible to freezing, but
must not be excessively restrictive.
Concentric Vent Termination
A concentric vent termination is approved for
use with these furnaces. The kit part number is
listed in Table 13. For proper installation of the
concentric vent termination, follow the installa-
tion instructions provided with that kit.
DRAINAGE OF CONDENSATE FROM
FURNACE
/ WARNING:
The condensate produced by the fumace
m ust be drained. Do not connect a water
supply to the drainage hose of the
furnace.
NOTE: The condensate drain should be pro-
tected from freezing when in unheated spaces.
18