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A 3-IN. MINIMUMCLEARANCE
TO COMBUSTION-AIR INTAKE
_VENT
IS REQUIRED.
INTAKE
30-IN. MtN
,
A 12-tN. MIN HORIZONTAL
PIPE
SECTION tS RECOMMENDED
WITH
SHORT (5 TO 8 FT) VENT SYSTEMS
TO REDUCE EXCESSIVE
CONDENSATE
DROPLETS FROM
EXITING THE VENT PIPE.
SHUTOFF
GAS VALVE
SEDIMENT
TRAP
CONDENSATE
TRAP
DRAIN
ACCESS
OPENING
FOR TRAP
NOTE:
LOCAL
CODES
MAY REQUIRE
A DRAIN
PAN UNDER
THE
FURNACE
AND
CONDENSATE
TRAP WHEN
A CONDENSING
FURNACE
IS INSTALLED
ABOVE
FINISHED
CEILINGS.
Fig. 11--Attic
Location
and Working
Platform
A96184
CONDENSATE
TRAP
FIELD
DRAIN
ATTACHMENT
Refer
to Condensate
Drain
section
%r
recommendations
and
procedures
PRESSURE
SWIT(H
TUBING
The LOWER
collector
box pressure
tube (pink
label)
is fhctory
connected
to the pressure
switch
for use when [_urnace is installed
in UPFLOW
applications.
This
tube
MUST
be
disconnected,
extended,
rerouted,
and then reconnected
to the pressure
switch
in
HORIZONTAL
LEFT
applications.
NOTE:
See Fig. 10 or tube routing
label on main Nmace
door to
check
for proper
connections.
Modify
robe as described
below.
1. Disconnect
collector
box pressure
tube (pink label) attached
to
pressure
switch.
2. Use
smaller
diameter
tube
(factory-supplied
in loose
parts
bag) to extend
tube disconnected
in item
1.
3. Route
extended
robe:
a. Behind
inducer
housing.
b. Between
blower
shelf and inducer
housing.
c. Behind
inducer
motor bracket.
d. Between
inducer
motor and pressure
switch.
4. Detem_ine
appropriate
length,
cut,
and
reconnect
robe
to
pressure
switch
connection
labeled
COLLE(TOR
BOX.
CONDENSATE
TRAP
FREEZE
PROTECTR)N
Refkr
to Condensate
Drain
Protection
section
for recommenda°
tions and procedures.
(ONSTRU(T
A WORKING
PLATFORM
(onstruct
working
plat%m_
where all required
furnace
clearances
are met
(See Fig. 3 and 11)
INIT
MAY
NOT
OPERATE
Failure
to fbltow
this caution
may result
in intem_ittent
unit
operation.
The condensate
trap MUST
be installed
below
furnace
See
Fig. 5 [br dimensions.
The drain
connection
to condensate
nap must also be properly
sloped
to an open drain.
NOTE:
Vent pipe length
is restricted
to a minimum
of 5 It. (See
Table
8.)
NOTE:
A
12-in.
minimum
horizontal
pipe
section
is recom-
mended
with short (5 to 8 f_) vent systems.
This recommendation
is to reduce
excessive
condensate
droplets
fi'om exiting
the vent
pipe. (See Fig.
11 or 38.)
Step
5--Horizontal
Right
(SupplyoAir
Discharge)
Applications
A horizontal
right furnace
application
is where
furnace
blower
is
located
to the tel} of combustion
and controls
section
of fi/mace,
and conditioned
air is discharged
to the right.
MINOR
PROPERTY
DAMAGE
Failure
to fbllow
this caution
may result
in minor
property
damage
Local codes may require
a drain pan under entire furnace
and
condensate
trap when
a condensing
fi/rnace
is used
in attic
application
or over
a finished
ceiling_
11
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