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GMPN080
2"
75'
67.5'
60'
52.5'
45'
GMPN100
3"
100'
100'
100'
100'
100'
GMPN120
3"
100'
100'
100'
100'
100'
Should more elbows be required,
subtract 7.5' from the vent length for each elbow used (over 4
as noted above). A maximum
of 6 elbows is acceptable.
The use of two 45 ° over one 90 ° is
preferred.
Do not count the termination
as an elbow.
Minimum
vent lengths are 5 ft. for vertical runs and 3ft. for horizontal
runs.
A pitch of 1/4" per foot toward the drain assembly
is necessary
for proper drainage.
The GMPN series of gas furnace
is a condensing
type appliance.
The products
of combustion
are
recirculated
through
a secondary
coil. During this process
the flue products
are brought to a
temperature
below dew point. Thus the moisture
present
in the flue products
condense,
leaving a
liquid by-product.
This by-product
must be removed from the furnace
and it's collection
system.
In addition,
the vent temperatures
are also considerably
lower than conventional
furnaces.
This
allows the use of low temperature
plastic as the vent system. The recommended
material is
schedule
40 PVC, DWV, ABS (or equivalent
if allowed
by local code). See previous
chart for
proper sizing. The drain trap and related parts must be installed as shown in the illustrations
located elsewhere
in these instructions.
Failure to follow these instructions
can cause products
of
combustion
including
Carbon
Monoxide
to enter the building.
This appliance
may be horizontally
vented through
an exterior wall. See the illustrations
located elsewhere
in this manual.
IF THIS FURNACE
IS INSTALLED
IN AN ATTIC OR SIMILAR
AREA WHERE
CONDENSATE
OVERFLOW
MAY BE A PROBLEM
AN AUXILIARY
DRAIN PAN MUST BE INSTALLED
UNDER THE FURNACE
WITH THE AUXILIARY
DRAIN LINES ROUTED
TO THE OUTDOORS
TO PREVENT
WATER
DAMAGE
CAUSED
BY LEAKS.
The vent pipes must be inspected
annually.
Visually
check the vent terminal screen and clean if necessary.
Visually
check for blockage
of the condensate
disposal system.
Hoses may be disconnected
to
determine
that proper flow is maintained.
Should an obstruction
be observed,
it can be dislodged
by forcing a stream of water through it using a device such as a garden hose.
This appliance
may be vertically
or horizontally
vented. Horizontal
venting requires
a 90 ° long
sweep elbow be installed as the vent terminal.
This elbow is to be installed
discharging
downward
and the factory supplied
termination
screen is to be attached.
To prevent damage
to
the vent pipe and its terminal the distance
from the terminal to the exiting wall is to be the
minimum
practical
distance
(within 12" would be acceptable).
Vertical venting
does not require
any terminal.
If desired, the vent may be faced downward
to prevent water or other foreign objects
from entering
the vent pipe. In that case two long radius elbows may be employed,
facing
downward
and terminating
no less than one foot (1') from the roof surface.
PROTECTION
FROM FREEZING
The vent pipe and drain assembly
must be properly
protected
from freezing particularly
if it is
installed
in an UNHEATED
SPACE.
Low wattage
tape heaters should be employed
on the drain
system.
The vent pipe should be insulated
using a one (1) inch thick closed foam insulation
if
exposed
to the outdoors.
For pipes located indoors or protected
from the elements
such as a
garage, basement,
etc. fiberglass
with an R value of 7 or greater is acceptable.
IO-151
7
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