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Upflow/ Horizontal Downflow/HorizontalCondensing, Direct Vent Gas-Fired Furnace
NATURAL GAS MODELSCentral Heating furnace designs are certified to ANSI Z21.47 / CSA 2.3 for both natural and L.P. gas. Limit setting and rating data were established and approved under standard rating condi-tions using American National Stan-dards Institute standards.
SAFE OPERATIONThe Integrated System Control has solid state devices, which continuously monitor for presence of flame, when the system is in the heating mode of operation. Dual solenoid combination gas valve and regulator provide extra safety.
QUICK HEATINGDurable, cycle tested, heavy gauge alu-minized steel heat exchanger quickly transfers heat to provide warm condi-tioned air to the structure. Low energy power vent blower, to increase effi-ciency and provide a positive discharge of gas fumes to the outside.
BURNERSMultiport Inshot burners will give years of quiet and efficient service. All models can be converted to L.P. gas without changing burners.
INTEGRATED SYSTEM CONTROLExclusively designed operational pro-gram provides total control of furnace limit sensors, blowers, gas valve, flame control and includes self diagnostics for ease of service. Also contains connec-tion points for E.A.C./humidifier.
AIR DELIVERYThe four speed, direct drive blower motor, has sufficient airflow for most heating and cooling requirements, will switch from heating to cooling speeds on demand from room thermostat. The blower door safety switch will prevent or terminate furnace operation when the blower door is removed.
SECONDARY HEAT EXCHANGERThe has a special type 29-4C™stainless steel secondary heat exchanger to re-claim heat from flue gases which would normally be lost instead.
STYLINGHeavy gauge steel and “wrap-around” cabinet construction is used in the cabinet with baked-on enamel finish for strength and beauty. The heat exchang-er section of the cabinet is completely lined with foil faced fiberglass insulation. This results in quiet and efficient opera-tion due to the excellent acoustical and insulating qualities of fiberglass. Built-in bottom pan and alternate bottom, left or right side return air connection provision.
FEATURES AND GENERAL OPERATIONThe High Efficiency Gas Furnaces employ a Silicon Nitride Hot Surface Ignition system, which eliminates the waste of a constant burning pilot. The integrated system control lights the main burners upon a demand for heat from the room thermostat. Complete front service access.
sor noncoital memory• Cleanable high velocity filters (upflow
only)•Hingedblowerdoor*•Perfectfitdoorlatches*•Insulatedblowerdoor*•Gasketedblowerdoor*•Completefrontserviceaccess•Left/rightgasconnection•Adjustablefanofftimes•OptionalL.Pconversionkit•Selectable cool ing fan of f de-
lay eliminates need for BAY24X045 time delay kit
• Singlewiretwinning
• Optional extended warranties
*(Upflowonly)
12-1329-03 3
Contents
General Features 2Features and Benefits 2
Standard Equipment 2OptionalEquipment 4
General Data 5AUH2B060A936VA 5AUH2B080A942VA 5AUH2C100A948VA 5AUH2D120A960VA 6ADH2B060A936VA 6ADH2B080A942VA 6ADH2C100A948VA 6ADH2D120A960VA 7
Performance Data 8Electrical Data 10Field Wiring 14Twinning Field Wiring 15Dimensions 16
*Maybe"A"or"T"1 Central Furnace heating designs are certified to ANSI Z21.47 / CSA 2.3.2ForU.S.applications,aboveinputratings(BTUH)areupto2,000feet,derate4%per1,000feetforelevationsabove2,000feetabovesea
3BasedonU.S.governmentstandardtests.4 The above wiring specifications are in accordance with National Electrical Code; however, installations must comply with local codes.
*Maybe"A"or"T"1 Central Furnace heating designs are certified to ANSI Z21.47 / CSA 2.3.2ForU.S.applications,aboveinputratings(BTUH)areupto2,000feet,derate4%per1,000feetforelevationsabove2,000feetabovesea
sea level.3BasedonU.S.governmentstandardtests.4 The above wiring specifications are in accordance with National Electrical Code; however, installations must comply with local codes.
BLOWER OPERATION OF UNIT NO. 2 IS SYNCRONIZEDWITH UNIT NO. 1 VIA SIGNALS
FROM TWIN CONNECTION.
SEE NOTE 4
OUTDOOR UNIT NO. 1(NO TRANSFORMER)
OUTDOOR UNIT NO. 1(WITH TRANSFORMER)
SEE NOTE 3
RC
ISOLATION RELAY(FIELD SUPPLIED)
ALTERNATE CONNECTION
R1
R1
SEE NOTE 5
ISOLATION RELAY(FIELD SUPPLIED)
SEE NOTE 4
ISOLATION RELAYSEE NOTE 4
JUMPER W1 TO W2ON BOTH UNITS.
B/CB/CB/CFrom Dwg. 21B341336 Rev. 2
6. SEE SW1 SETTINGS FOR 2ND STAGE TIMING. DEFAULT IS 10 MINUTES.
12-1329-03 15
From
Dw
g.C
3418
84
UH2 Dimensions
*UH
2 U
PF
LO
W / H
OR
IZO
NTA
L O
UT
LIN
E D
RA
WIN
G(A
LL
DIM
EN
SIO
NS
AR
E IN
INC
HE
S)
Mo
del
(See
No
te 1
& 2
)D
IM "
A"
DIM
"B
"D
IM "
C"
DIM
"D
"D
IM "
E"
DIM
"F
"
*UH
2B06
0A93
6VA
*U
H2B
080A
942V
A17
-1/2
"2-
1/4"
16-1
/4"
16"
7-1/
2"2"
*UH
2C10
0A94
8VA
21"
2-1/
2"19
-3/4
"19
-1/2
"9"
3"*U
H2D
120A
960V
A24
-1/2
"2-
15/1
6"23
-1/4
"23
"10
"3"
*P
refix
May
Be
"A"
or"
T"
Not
es:
1.*
UH
2D12
0A96
0VA
Req
uire
s3"
Dia
met
erV
entP
ipe.
*U
H2C
100A
948V
AR
equi
res
2-1/
2"o
r3"
Dia
met
er
Ven
t Pip
e.2.
Dia
met
ero
fVen
tPip
em
ayb
elim
ited
to2
-1/2
"or
3"
ons
ome
mod
els
atd
iffer
enta
ltitu
des.
Ref
erto
the
Ven
t Len
gth
Tabl
e fo
r pr
oper
app
licat
ion.
16 12-1329-03
DH2 Dimensions
From
Dw
g.2
1C34
1885
Rev
.1
*DH
2 D
OW
NF
LO
W / H
OR
IZO
NTA
L O
UT
LIN
E D
RA
WIN
G(A
LL
DIM
EN
SIO
NS
AR
E IN
INC
HE
S)
Mo
del
(See
No
te 1
)D
IM "
A"
DIM
"B
"D
IM "
C"
DIM
"D
"
*DH
2B06
0A93
6VA
*DH
2B08
0A94
2VA
17-1
/2"
2-1/
4"16
-1/4
"16
"
*DH
2C10
0A94
8VA
21"
2-1/
2"19
-3/4
"19
-1/2
"
*DH
2D12
0A96
0VA
24-1
/2"
2-15
/16"
23-1
/4"
23"
*P
refix
May
Be
"A"
or"
T"
Not
es:1
.Dia
met
ero
fVen
tPip
em
ayb
elim
ited
to2
-1/2
"or
3"
ons
ome
mod
els
at d
iffer
ent a
ltitu
des.
Ref
er to
the
Ven
t Len
gth
Tabl
e fo
r p
rope
r ap
plic
atio
n.
12-1329-03 17
The manufacturer has a policy of continuous product and product data improvement and it reserves the right to change design and specifications without notice.
American StandardHeating & Air Conditioning6200TroupHighwayTyler,TX75707