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BLOWER
OFF-DELAY
J2 JUMPER
TWINNING
AND/OR
COMPONENT
TEST
TERMINAL
24-V THERMOSTAT
TERMINALS
3-AMP
FUSE
LED OPERATION
&
DIAGNOSTIC
LIGHT
115-VAC(L2)
CONNECTIONS
ob
HUMIDIFIER
TERMINAL
(24-VAC 0.5 AMP MAX.)
TRANSFORMER
24-VAC
CONNECTIONS
PL1-LOW VOLTAGE MAIN
HARNESS
CONNECTOR
A02100
A plugged
drain connection
has been provided
on this fitting
fbr use when moisture
is fbund in combustion-air
intake
pipe
and combustion
box
If use of this drain connection
is desired,
&ill out fitting's
tap plug with
a 3/16-in.
&ill and connect
a
field-supplied
3/8-in.
robe. This tube should be routed to open
condensate
&ain for furnace
and AiC (if used), and should be
tIapped.
(See Fig. 36.)
Vent
Pipe
NOTE:
Furnace
vent pipe
connections
are sized
for 2-in. pipe.
Any vent pipe size change
should be made outside
furnace
casing
in vertical
pipe. (See Fig. 37.) This allows proper
&ainage
of vent
condensate.
Detem_ine
vent pipe
diameter
and maximm_a
pipe lengths
using
Table 8
Furnace
vent pipe connection
must be attached
as shown
in Fig.
34. Inducer
housing
alternate
vent cap may need to be relocated
in
some applications.
NOTE:
Starting
at furnace,
slope vent pipe a minimum
of 1/4 in
per
linear
ft upward
to termination(s)
with
no
sags
between
hangers.
UNIT
MAY
NOT
OPERATE
Failure
to %ltow
this caution
may result
in intem_ittent
unit
operation.
When
vent pipe is exposed
to temperatures
below
fi'eezing,
such as when
it passes
through
an unheated
space or when
a
chimney
is used
as a raceway,
pipe
must
be insulated
as
described
in Table 9 with Am_aflex-type
insulation
An abandoned
masonry
chimney
may be used as a raceway
%r
properly
insulated
and
supported
vent
pipe
Each
furnace
must
have its own vent pipe and be terminated
individually,
as shown
in
Fig. 41.
Other gas appliances
wit}* their own venting
system
may also use
the abandoned
chimney
as a raceway
providing
it is permitted
by
local code, the curt'out edition
of d_e National
Fuel Gas (7ode and
the vent or liner manufi_cmrer's
installation
instl-uctions.
Care must
be taken
to prevent
the exhaust
gases
fi'om one appliance
from
contaminating
the combustion
air of other
gas appliances.
32
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