SYSTEM OPERATION
14
AIR
DISCHARGE
Bottom
Return
Duct
Connection
Side
Return
Duct
Connection
Side
Return
Duct
Connection
UPFLOW
UPRIGHT
AIR
DISCHARGE
Bottom
Return
Duct
Connection
UPFLOW HORIZONTAL
RIGHT AIR DISCHARGE
UPFLOW HORIZONTAL
LEFT AIR DISCHARGE
AIR
DISCHARGE
AIR
DISCHARGE
Bottom
Return
Duct
Connection
Bottom
Return
Duct
Connection
COUNTERFLOW HORIZONTAL
RIGHT AIR DISCHARGE
COUNTERFLOW HORIZONTAL
LEFT AIR DISCHARGE
90% Furnace Recommended Installation Positions
NOTE:
Alternate “vertical” piping connections can not be
used when an upflow 90% furnace is installed with supply
air discharging to the right or when a counterflow furnace is
installed with supply discharging to the left. In this case, use
the standard flue and combustion air piping connections
A
lternate Electrical and Gas Line Connections
Furnaces have provisions allowing for electrical and gas
line connections through either side panel. In horizontal
applications the connections can be made either through the
“top” or “bottom” of the furnace.
D
rain Pan
A drain pan must be provided if the furnace is installed above
a conditioned area. The drain pan must cover the entire area
under the furnace (and air conditioning coil if applicable).
Freeze Protection
If the drain trap and drain line will be exposed to temperatures
near or below freezing, adequate measures must be taken
to prevent condensate from freezing.
NOTE:
The use of
insulation and/or heat tape is recommended. Failure to
provide proper condensate drainage can result in property
damage.
Propane Gas and/or High Altitude Installations
WARNING
P
O
SSI
B
LE PR
O
PER
TY
DAMAGE
,
PERS
O
NAL INJ
U
R
Y
O
R DEA
TH
MA
Y
O
CC
U
R I
F
TH
E C
O
RREC
T
C
O
NVERSI
O
N KI
T
S ARE N
OT
INS
T
ALLED
.
T
H
E APPR
O
PRIA
T
E KI
T
S
M
U
S
T
B
E APPLIED
TO
INS
U
RE SA
F
E AND PR
O
PER
FU
RNACE
O
PERA
T
I
O
N
.
A
LL
C
O
NVERSI
O
NS M
U
S
T
B
E PER
FO
RMED
BY
A Q
U
ALI
F
IED INS
T
ALLER
O
R SERVICE
AGENC
Y.
This furnace is shipped from the factory configured for natural
gas at standard altitude. Propane gas installations require
an orifice change to compensate for the energy content
difference between natural and propane gas.
High altitude installations may require both a pressure switch
and an orifice change. These changes are necessary to
compensate for the natural reduction in the density of both
the gas fuel and the combustion air at higher altitude.
Refer to the
Accessories Charts
in this manual or product
Specification Sheet for a tabular listing of appropriate
manufacturer’s kits for propane gas and/or high altitude
installations. The indicated kits must be used to insure
safe and proper furnace operation. All conversions must be
performed by a qualified installer, or service agency.
V
ENT/FLUE PIPE AND COMBUSTION AIR PIPE
WARNING
F
AIL
U
RE
TO
FO
LL
O
W
TH
ESE INS
T
R
U
C
T
I
O
NS CAN RES
U
L
T
IN
BO
DIL
Y
INJ
U
R
Y
O
R
DEA
TH.
C
ARE
FU
LL
Y
READ AND
FO
LL
O
W ALL INS
T
R
U
C
T
I
O
NS GIVEN IN
TH
IS
SEC
T
I
O
N
.
WARNING
U
P
O
N C
O
MPLE
T
I
O
N
OF
TH
E
FU
RNACE INS
T
ALLA
T
I
O
N
,
CARE
FU
LL
Y
INSPEC
T
TH
E
EN
T
IRE
F
L
U
E S
Y
S
T
EM
BOTH
INSIDE AND
OUT
SIDE
TH
E
FU
RNACE
TO
ASS
U
RE I
T
IS PR
O
PERL
Y
SEALED
.
L
EAKS IN
TH
E
F
L
U
E S
Y
S
T
EM CAN RES
U
L
T
IN SERI
OU
S
PERS
O
NAL INJ
U
R
Y
O
R DEA
TH
D
U
E
TO
EXP
O
S
U
RE
TO
F
L
U
E PR
O
D
U
C
T
S
,
INCL
U
DING CAR
BO
N M
O
N
O
XIDE
.
This manual will refer to the pipe that discharges products of
combustion to the outdoors as the “vent” pipe or “flue” pipe.
The pipe that supplies air for combustion to the furnace will
be referred to as the “intake” pipe or “combustion air” pipe.
A condensing gas furnace achieves its high level of efficiency
by extracting almost all of the heat from the products of
combustion and cooling them to the point where condensation
takes place. Because of the relatively low flue gas temperature
and water condensation requirements, PVC pipe is used as
venting material.
This furnace must not be connected to Type B, BW, or L vent
or vent connector, and must not be vented into any portion
of a factory built or masonry chimney except when used as
a pathway for PVC as described later in this section.
Never
common vent this appliance with another appliance or use a
vent which is used by a solid fuel appliance.
It is the responsibility of the installer to follow the manufacturers’
