A 3-IN. MINIMUMCLEARANCE
TO COMBUSTION-AIRINTAKE _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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