Trane UH1B040A9H21B Series User manual

Service Facts
© 2013 Trane All Rights Reserved
NOTICE: The manufacturer has a policy of continuous product and product data improvement and
reserves the right to change design and specifications without notice.
PRODUCT SPECIFICATIONS 1
MODEL
TYPE
RATINGS 2
Input BTUH 3
Capacity BTUH (ICS) 3
AFUE
Temp. rise (Min.-Max.) °F.
BLOWER DRIVE 5
Diameter - Width (In.)
No. Used
Speeds (No.)
CFM vs. in. w.g.
Motor HP
R.P.M.
Volts / Ph / Hz
FLA
COMBUSTION FAN — Type
Drive - No. Speeds
Motor HP - RPM
Volts / Ph / Hz
FLA
FILTER — Furnished?
Type Recommended
Shipped (No.-Size-Thk.)
VENT PIPE DIAMETER - Min (in.)67
HEAT EXCHANGER
Type - Fired
- Unfired
Gauge (Fired)
ORIFICES — Main
Nat. Gas. Qty. — Drill Size
L.P. Gas Qty. — Drill Size
GAS VALVE
PILOT SAFETY DEVICE
Type
BURNERS — Type
Number
POWER CONN. — V / Ph / Hz 4
Ampacity (In Amps)
Max. Overcurrent Protection (Amps)
PIPE CONN. SIZE (IN.)
DIMENSIONS
Crated (In.)
WEIGHT
Shipping (Lbs.) / Net (Lbs.)
High Efficiency Single Stage Gas Furnace
— Condensing — Upflow / Horizontal and
Downflow/ Horizontal — Single Stage Heat
Models: * - First letter may be “A” or “T”
1Central Furnace heating designs are certified to ANSI Z21.47 / CSA 2.3.
2For U.S. applications, above input ratings (BTUH) are up to 2,000 feet, derate 4% per 1,000 feet for elevations above 2,000 feet above sea level.
For Canadian applications, above input ratings (BTUH) are up to 4,500 feet, derate 4% per 1,000 feet for elevations above 4,500 feet above sea level.
3Based on U.S. government standard tests.
4The above wiring specifications are in accordance with National Electrical Code; however, installations must comply with local codes.
54 Speed constant torque high efficiency ECM blower motor
6Refer to the Vent Length Table in the Installer's Guide or the Allowable Vent Length label located on the furnace.
7All *UH1 and *DH1 furnace models have a vent outlet diameter that equals 2".
8Energy Star
IMPORTANT — This document contains a wiring diagram and service information. This is customer property and is to
remain with this unit. Please return to service information pack upon completion of work.
DISCONNECT POWER BEFORE SERVICING
WARNING
*UH1B040A9H21B
Upflow / Horizontal
40,000
38,000
95
30 - 60
DIRECT
10 x 7
1
4
See Fan Performance Table
1/2
1075
115/1/60
6.8
Centrifugal
Direct - 1
1/55 - 3000
115/1/60
1.00
Ye s
High Velocity
1 - 17x25 - 1in.
2 Round
Alum. Steel
20
2 — 45
2 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
2
115/1/60
9.7
15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
139 / 129
*UH1B060A9H31B
Upflow / Horizontal
60,000
57,000
95
30 - 60
DIRECT
10 x 7
1
4
See Fan Performance Table
1/2
1075
115/1/60
6.8
Centrifugal
Direct - 1
1/15 - 3450
115/1/60
1.75
Ye s
High Velocity
1 - 17x25 - 1in.
2 Round
Alum. Steel
20
3 — 45
3 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
3
115/1/60
10.4
15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
150 / 140
*UH1B080A9H31C
Upflow / Horizontal
77,000
73,150
95
35 - 65
DIRECT
10 x 8
1
4
See Fan Performance Table
1/2
1075
115/1/60
6.8
Centrifugal
Direct - 1
1/20 - 3450
115/1/60
0.70
Ye s
High Velocity
1 - 17x25 - 1in.
2 Round
Alum. Steel
20
4 — 45
4 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
4
115/1/60
9.4
15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
158 / 148
*UH1B040A9H21B
*UH1B060A9H31B
*UH1B080A9H31C
*UH1C100A9H41B
*UH1D120A9H51B
*DH1B040A9H21B
UH1-H-SF-1E
*DH1B065A9H31B
*DH1C085A9H41B
*DH1D110A9H51B

2 UH1-H-SF-1E
Service Facts
PRODUCT SPECIFICATIONS 1
MODEL
TYPE
RATINGS 2
Input BTUH 3
Capacity BTUH (ICS) 3
AFUE
Temp. rise (Min.-Max.) °F.
BLOWER DRIVE 5
Diameter - Width (In.)
No. Used
Speeds (No.)
CFM vs. in. w.g.
Motor HP
R.P.M.
Volts / Ph / Hz
FLA
COMBUSTION FAN — Type
Drive - No. Speeds
Motor HP - RPM
Volts / Ph / Hz
FLA
FILTER — Furnished?
Type Recommended
Shipped (No.-Size-Thk.)
VENT PIPE DIAMETER - Min (in.)67
HEAT EXCHANGER
Type - Fired
- Unfired
Gauge (Fired)
ORIFICES — Main
Nat. Gas. Qty. — Drill Size
L.P. Gas Qty. — Drill Size
GAS VALVE
PILOT SAFETY DEVICE
Type
BURNERS — Type
Number
POWER CONN. — V / Ph / Hz 4
Ampacity (In Amps)
Max. Overcurrent Protection (Amps)
PIPE CONN. SIZE (IN.)
DIMENSIONS
Crated (In.)
WEIGHT
Shipping (Lbs.) / Net (Lbs.)
MODEL
TYPE
RATINGS 2
Input BTUH 3
Capacity BTUH (ICS) 3
AFUE
Temp. rise (Min.-Max.) °F.
BLOWER DRIVE 5
Diameter - Width (In.)
No. Used
Speeds (No.)
CFM vs. in. w.g.
Motor HP
R.P.M.
Volts / Ph / Hz
FLA
COMBUSTION FAN — Type
Drive - No. Speeds
Motor HP - RPM
Volts / Ph / Hz
FLA
FILTER — Furnished?
Type Recommended
Shipped (No.-Size-Thk.)
VENT PIPE DIAMETER - Min (in.)67
HEAT EXCHANGER
Type - Fired
- Unfired
Gauge (Fired)
ORIFICES — Main
Nat. Gas. Qty. — Drill Size
L.P. Gas Qty. — Drill Size
GAS VALVE
PILOT SAFETY DEVICE
Type
BURNERS — Type
Number
POWER CONN. — V / Ph / Hz 4
Ampacity (In Amps)
Max. Overcurrent Protection (Amps)
PIPE CONN. SIZE (IN.)
DIMENSIONS
Crated (In.)
WEIGHT
Shipping (Lbs.) / Net (Lbs.)
*UH1D120A9H51B 8
Upflow / Horizontal
110,000
104,500
95
40 - 70
DIRECT
11 x 10
1
4
See Fan Performance Table
1
1100
115/1/60
10.9
Centrifugal
Direct - 1
1/20 - 3450
115/1/60
.70
Ye s
High Velocity
1 - 24x25 - 1in.
3 Round
Alum. Steel
20
6 — 45
6 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
6
115/1/60
14.5
15
1/2
H x W x D
41-3/4 x 26-1/2 x 30-1/2
205 / 193
*DH1B040A9H21B
Upflow / Horizontal
40,000
38,000
95
30 - 60
DIRECT
10 x 7
1
4
See Fan Performance Table
1/2
1080
115/1/60
6.8
Centrifugal
Direct - 1
1/55 - 3000
115/1/60
1.0
Ye s
High Velocity
1 - 14x20 - 1in.
2 Round
Alum. Steel
20
2 — 45
2 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
2
115/1/60
9.7
15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
145 / 135
*UH1C100A9H41B
Upflow / Horizontal
97,000
92,105
95
35 - 65
DIRECT
11 x 10
1
4
See Fan Performance Table
3/4
1100
115/1/60
8.4
Centrifugal
Direct - 1
1/20 - 3450
115/1/60
.70
Ye s
High Velocity
1 - 20x25 - 1in.
3 Round
Alum. Steel
20
5 — 45
5 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
5
115/1/60
11.4
15
1/2
H x W x D
41-3/4 x 23 x 30-1/2
171 / 160
*DH1B065A9H31B
Upflow / Horizontal
60,000
57,000
95
25 - 55
DIRECT
10 x 8
1
4
See Fan Performance Table
3/4
1075
115/1/60
8.4
Centrifugal
Direct - 1
1/25 - 3200
115/1/60
1.35
Ye s
High Velocity
2 - 14x20 - 1in.
2 Round
Alum. Steel
20
4 — 48
4 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
4
115/1/60
12.0
15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
158 / 148
* May be "A" or "T
1Central Furnace heating designs are certified to ANSI Z21.47 / CSA 2.3.
2For U.S. applications, above input ratings (BTUH) are up to 2,000 feet, derate 4% per
1,000 feet for elevations above 2,000 feet above sea level.
For Canadian applications, above input ratings (BTUH) are up to 4,500 feet, derate 4%
per 1,000 feet for elevations above 4,500 feet above sea level.
3Based on U.S. government standard tests.
4The above wiring specifications are in accordance with National Electrical Code; however,
installations must comply with local codes.
5 4 Speed constant torque high efficiency ECM blower motor
6Refer to the Vent Length Table in the Installer's Guide or the Allowable Vent Length label
located on the furnace.
7All *UH1 and *DH1 furnace models have a vent outlet diameter that equals 2".
8Energy Star

UH1-H-SF-1E 3
Service Facts
PRODUCT SPECIFICATIONS 1
MODEL
TYPE
RATINGS 2
Input BTUH 3
Capacity BTUH (ICS) 3
AFUE
Temp. rise (Min.-Max.) °F.
BLOWER DRIVE 5
Diameter - Width (In.)
No. Used
Speeds (No.)
CFM vs. in. w.g.
Motor HP
R.P.M.
Volts / Ph / Hz
FLA
COMBUSTION FAN — Type
Drive - No. Speeds
Motor HP - RPM
Volts / Ph / Hz
FLA
FILTER — Furnished?
Type Recommended
Shipped (No.-Size-Thk.)
VENT PIPE DIAMETER - Min (in.)67
HEAT EXCHANGER
Type - Fired
- Unfired
Gauge (Fired)
ORIFICES — Main
Nat. Gas. Qty. — Drill Size
L.P. Gas Qty. — Drill Size
GAS VALVE
PILOT SAFETY DEVICE
Type
BURNERS — Type
Number
POWER CONN. — V / Ph / Hz 4
Ampacity (In Amps)
Max. Overcurrent Protection (Amps)
PIPE CONN. SIZE (IN.)
DIMENSIONS
Crated (In.)
WEIGHT
Shipping (Lbs.) / Net (Lbs.)
* May be "A" or "T
1Central Furnace heating designs are certified to ANSI Z21.47 / CSA 2.3.
2For U.S. applications, above input ratings (BTUH) are up to 2,000 feet, derate 4% per 1,000 feet for elevations above 2,000 feet above sea level.
For Canadian applications, above input ratings (BTUH) are up to 4,500 feet, derate 4% per 1,000 feet for elevations above 4,500 feet above sea level.
3Based on U.S. government standard tests.
4The above wiring specifications are in accordance with National Electrical Code; however, installations must comply with local codes.
5 4 Speed constant torque high efficiency ECM blower motor
6Refer to the Vent Length Table in the Installer's Guide or the Allowable Vent Length label located on the furnace.
7All *UH1 and *DH1 furnace models have a vent outlet diameter that equals 2".
8Energy Star
*DH1C085A9H41B
Downflow / Horizontal
80,000
76,000
95
30 - 60
DIRECT
11 x 10
1
4
See Fan Performance Table
3/4
1075
115/1/60
8.4
Centrifugal
Direct - 1
1/20 - 3450
115/1/60
.70
Ye s
High Velocity
2 - 16x20 - 1in.
2.5 Round
Alum. Steel
20
5 — 48
5 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
5
115/1/60
11.4
15
1/2
H x W x D
41-3/4 x 23 x 30-1/2
171 / 160
*DH1D110A9H51B
Downflow / Horizontal
110,000
104,500
95
35 - 65
DIRECT
11 x 10
1
4
See Fan Performance Table
1
1075
115/1/60
10.9
Centrifugal
Direct - 1
1/20 - 3450
115/1/60
.70
Ye s
High Velocity
2 - 16x20 - 1in.
2.5 Round
Alum. Steel
20
6 — 48
6 — 56
Redundant - Single Stage
Hot Surface Ignition
Multiport Inshot
6
115/1/60
14.5
15
1/2
H x W x D
41-3/4 x 26-1/2 x 30-1/2
205 / 193
NOTE: Furnace is certified to leak 2% or less of nominal air
conditioning CFM delivered when pressurized to .5” water
column with all inlets, outlets, and drains sealed.

4 UH1-H-SF-1E
Service Facts
SEQUENCE OF OPERATION
Thermostat call for heat
R and W thermostat contacts close signaling the control
module to run its self-check routine. After the control module
has verified that the pressure switch contacts are open and
the limit switch(es) contacts are closed, the draft blower will be
energized.
As the induced draft blower comes up to speed, the pressure
switch contacts will close and the ignitor warm up period will
begin. The ignitor will heat for approximately 17 seconds, then
the gas valve is energized to permit gas flow to the burners.
The flame sensor confirms that ignition has been achieved
within the 4 second ignition trial period.
SAFETY SECTION
▲WARNING
!
The cabinet must have an uninterrupted or unbroken
ground according to National Electrical Code, ANSI/NFPA
70 - “latest edition” and Canadian Electrical Code, CSA
C22.1 or local codes to minimize personal injury if an
electrical fault should occur.
Failure to follow this warning could result in an electrical
shock, fire, injury, or death.
▲CAUTION
!
The integrated furnace control is polarity sensitive. The
hot leg of the 115 VAC power must be connected to the
BLACK field lead.
▲WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a com-
mercially available soap solution made specifically for
the detection of leaks to check all connections. A fire or
explosion may result causing property damage, personal
injury, or loss of life.
▲WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Improper servicing could result in dangerous operation,
serious injury, death, or property damage.
After the flame sensor confirms that ignition has been
achieved, the delay to fan ON period begins timing and after
approximately 45 seconds the indoor blower motor will be
energized and will continue to run during the heating cycle.
When the thermostat is satisfied, R and W thermostat contacts
open, the gas valve will close, the flames will extinguish, and
the induced draft blower will be de-energized. The indoor
blower motor will continue to run for the fan off period (Field
selectable at 60, 100, 140 or 180 seconds), then will be de-
energized by the control module.
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monoxide
poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or the CAN/CGA B149
Installation Codes and these instructions. Determine
that there is no blockage or restriction, leakage,
corrosion and other deficiencies which could cause an
unsafe condition.
3. As far as practical, close all building doors and
windows and all doors between the space in which the
appliance(s) connected to the venting system are
located and other deficiencies which could cause an
unsafe condition.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not
connected to the venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so
they are operating at maximum speed. Do not operate
a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7. If improper venting is observed during any of the above
tests, the venting system must be corrected in
accordance with the National Fuel Gas Code,
ANSI Z221.1/NFPA 54 and/or CAN/CGA B149
Installation Codes.
8. After it has been determined that each appliance
connected to the venting system properly vents where
tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas-fired
burning appliance to their previous conditions of use.
▲
WARNING
!

UH1-H-SF-1E 5
Service Facts
AIRFLOW ADJUSTMENT
Check inlet and outlet air temperatures to make sure they are
within the ranges specified on the furnace rating nameplate. If
the airflow needs to be increased or decreased, see the wiring
diagram for information on changing the speed of the blower
motor.
▲WARNING
!
Disconnect power to the unit before removing the blower
door.
Failure to follow this warning could result in personal
injury from moving parts.
This unit is equipped with a blower door switch which cuts
power to the blower and gas valve causing shutdown when
the door is removed. Operation with the door removed or ajar
can permit the escape of dangerous fumes. All panels must be
securely closed at all times for safe operation of the furnace.
BODILY INJURY CAN RESULT FROM HIGH VOLTAGE
ELECTRICAL COMPONENTS, FAST MOVING FANS,
AND COMBUSTIBLE GAS. FOR PROTECTION FROM
THESE INHERENT HAZARDS DURING INSTALLATION
AND SERVICING, THE ELECTRICAL SUPPLY MUST BE
DISCONNECTED AND THE MAIN GAS VALVE MUST
BE TURNED OFF. IF OPERATING CHECKS MUST BE
PERFORMED WITH THE UNIT OPERATING, IT IS THE
TECHNICIANS RESPONSIBILITY TO RECOGNIZE
THESE HAZARDS AND PROCEED SAFELY.
▲WARNING
!
The following warning complies with State of California law, Proposition 65.
Hazardous Gases!
Exposure to fuel substances or by-products of incomplete
fuel combustion is believed by the state of California to
cause cancer, birth defects, or other reproductive harm.
▲
WARNING
!
▲WARNING
!
The following warning complies with State of California law, Proposition 65.
This product contains fiberglass wool insulation!
Fiberglass dust and ceramic fibers are believed by the
State of California to cause cancer through inhalation.
Glasswool fibers may also cause respiratory, skin, or
eye irritation.
PRECAUTIONARY MEASURES
●
Avoid breathing fiberglass dust.
● Use a NIOSH approved dust/mist respirator.
● Avoid contact with the skin or eyes. Wear long-sleeved,
loose-fitting clothing, gloves, and eye protection.
● Wash clothes separately from other clothing: rinse
washer thoroughly.
● Operations such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations requiring
additional respiratory protection. Use the appropriate
NIOSH approved respirator in these situations.
FIRST AID MEASURES
Eye Contact – Flush eyes with water to remove dust.
If symptoms persist, seek medical
attention.
Skin Contact – Wash affected areas gently with soap
and warm water after handling.
INDOOR BLOWER TIMING
Heating: The control module controls the indoor blower. The
blower start is fixed at 45 seconds after ignition. The FAN-OFF
period is field selectable by dip switches at 60, 100, 140, or
180 seconds. The factory setting is 100 seconds (See wiring
diagram).
Cooling: The fan delay off period is factory set at 0 seconds.
The option for 80 second delay off is field selectable (See wir-
ing diagram).
NOTE:
Direct drive motors have bearings which are permanently
lubricated and under normal use, lubrication is not recom-
mended.

6 UH1-H-SF-1E
Service Facts
From Dwg. D342491P03
WIRING DIAGRAM

UH1-H-SF-1E 7
Service Facts
From Dwg. D342491P03
SCHEMATIC DIAGRAM

8 UH1-H-SF-1E
Service Facts
From Dwg. D342800P03
WIRING DIAGRAM

UH1-H-SF-1E 9
Service Facts
From Dwg. D342800P03
SCHEMATIC DIAGRAM
NOTE: For the *DH1C085A9H41B furnace, Do
NOT use the LOW speed tap for heating

10 UH1-H-SF-1E
Service Facts
PERIODIC SERVICING REQUIREMENTS
1. GENERAL INSPECTION — Examine the furnace installa-
tion annually for the following items:
a. All flue product carrying areas external to the furnace
(i.e. chimney, vent connector) are clear and free of
obstruction. A vent screen in the end of the vent (flue)
pipe must be inspected for blockage annually.
b. The vent connector is in place, slopes upward and is
physically sound without holes or excessive corrosion.
c. The return air duct connection(s) is physically sound, is
sealed to the furnace and terminates outside the space
containing the furnace.
d. The physical support of the furnace should be sound
without sagging, cracks, gaps, etc., around the base so
as to provide a seal between the support and the base.
e. There are no obvious signs of deterioration of the fur-
nace.
2. FILTERS — Filters should be cleaned or replaced (with
high velocity filters only), monthly and more frequently
during high use times of the year such as midsummer or
midwinter.
3. BLOWERS — The blower size and speed determine the
air volume delivered by the furnace. The blower motor
bearings are factory lubricated and under normal operat-
ing conditions do not require servicing. If motor lubrica-
tion is required it should only be done by a qualified ser-
vicer. Annual cleaning of the blower wheel and housing is
recommended for maximum air output, and this must be
performed only by a qualified servicer or service agency.
4. IGNITER — This unit has a special hot surface direct igni-
tion device that automatically lights the burners. Please
note that it is very fragile and should be handled with care.
▲WARNING
!
Do NOT touch igniter. It is extremely hot.
Failure to follow this warning could result in severe burns.
5. BURNER — Gas burners do not normally require sched-
uled servicing, however, accumulation of foreign material
may cause a yellowing flame or delayed ignition. Either
condition indicates that a service call is required. For
best operation, burners must be cleaned annually using
brushes and vacuum cleaner.
Turn off gas and electric power supply. To clean burners,
remove the top burner bracket. Lift burners from orifices.
NOTE:
Be careful not to break igniter when removing burners.
Clean burners with brush and/or vacuum cleaner. Reas-
semble parts by reversal of the above procedure.
NOTE:
On LP (propane) units, some light yellow tipping of the
outer mantle is normal. Inner mantle should be bright
blue.
Natural gas units should not have any yellow tipped
flames. This condition indicates that a service call is
required. For best operation, burners must be cleaned an-
nually using brushes and vacuum cleaner.
NOTE:
On LP (propane) units, due to variations in BTU content
and altitude, servicing may be required at shorter inter-
vals.
▲WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation instructions for the vent-
ing system being placed into operation could result in
carbon monoxide poisoning or death.
6. HEAT EXCHANGER/FLUE PIPE — These items must
be inspected for signs of corrosion, and/or deterioration
at the beginning of each heating season by a qualified
service technician and cleaned annually for best opera-
tion. To clean flue gas passages, follow recommendations
below:
a. Turn off gas and electric power supply.
b. Inspect flue pipe exterior for cracks, leaks, holes or
leaky joints.
c. Remove burner compartment door from furnace.
d. Inspect around insulation covering flue collector box.
Inspect induced draft blower connections to the flue
pipe connection.
e. Remove burners. (See 4.)
f. Use a mirror and flashlight to inspect interior of heat
exchanger, be careful not to damage the igniter, flame
sensor or other components.
g. If any corrosion is present, contact a service agency.
Heat exchanger should be cleaned by a qualified ser-
vice technician.
h. After inspection is complete replace burners and fur-
nace door.
i. Restore gas supply. Check for leaks using a soap solu-
tion. Restore electrical supply. Check unit for normal
operation.
7. FURNACE CONDENSATE DRAIN TUBES - Condensate
drain tubes must be checked periodically to assure that
condensate can flow freely from unit to drain. If a drain
problem cannot be corrected, call a qualified servicer.
7. COOLING COIL CONDENSATE DRAIN — If a cool-
ing coil is installed with the furnace, condensate drains
should be checked and cleaned periodically to assure that
condensate can drain freely from coil to drain. If conden-
sate cannot drain freely water damage could occur. (See
Condensate Drain in Installer’s Guide)
▲CAUTION
!
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and danger-
ous operation.
Verify proper operation after servicing.
▲WARNING
!
Disconnect power to the unit before removing the blower
door.
Failure to follow this warning could result in personal
injury from moving parts.

UH1-H-SF-1E 11
Service Facts
CFM VS. TEMPERATURE RISE
MODEL
CFM (CUBIC FEET PER MINUTE)
600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400
*UH1B040A9H21B 59 50 44 39 35 32 29
*UH1B060A9H31B 59 53 48 44 41 38
*UH1B080A9H31C 64 59 54 50 47 44 41
*UH1C100A9H41B 66 61 57 53 50 47 45 43
*UH1D120A9H51B 65 60 57 54 51 48 46 44
* May be "A" or "T"
FURNACE AIRFLOW (CFM) VS. STATIC PRESSURE (ins.w.g.)
MODEL SPEED TAP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
*UH1B040A9H21B
4 - HIGH - Black 1159 1131 1102 1077 1052 1022 992 961 930
3 - MED-HIGH - Blue 938 910 881 851 820 786 751 717 662
2 - MED-LOW - Yellow 844 814 783 750 717 681 645 604 563
1 - LOW - Red** 772 732 691 656 621 581 540 497 454
*UH1B060A9H31B
4 - HIGH - Black 1402 1362 1318 1267 1214 1157 1095 1033 960
3 - MED-HIGH - Blue** 1199 1174 1149 1127 1099 1075 1028 973 897
2 - MED-LOW - Yellow 1104 1080 1053 1031 1002 980 955 931 890
1 - LOW - Red 834 808 770 750 712 677 641 599 566
*UH1B080A9H31C
4 - HIGH - Black 1328 1304 1277 1253 1224 1182 1127 1057 959
3 - MED-HIGH - Blue** 1519 1493 1464 1422 1368 1306 1242 1161 1054
2 - MED-LOW - Yellow 1072 1039 1015 991 956 928 891 858 828
1 - LOW - Red 810 782 759 729 703 668 643 612 582
*UH1C100A9H41B
4 - HIGH - Black 1586 1552 1517 1477 1443 1410 1366 1331 1289
3 - MED-HIGH - Blue** 1893 1858 1826 1793 1759 1724 1691 1646 1582
2 - MED-LOW - Yellow 1364 1320 1282 1241 1205 1167 1120 1078 1045
1 - LOW - Red 1107 1060 1003 959 919 863 825 782 730
*UH1D120A9H51B
4 - HIGH - Black 2141 2108 2076 2041 2009 1976 1939 1894 1826
3 - MED-HIGH - Blue** 2072 2038 2007 1975 1938 1910 1880 1845 1797
2 - MED-LOW - Yellow 1886 1853 1816 1785 1754 1718 1688 1652 1619
1 - LOW - Red 1647 1609 1573 1540 1497 1465 1429 1391 1358
*= First letter may be "A" or "T"
** = Factory Set Heat Speed Tap Setting

12 UH1-H-SF-1E
Service Facts
FURNACE AIRFLOW (CFM) VS. STATIC PRESSURE (ins.w.g.)
MODEL SPEED TAP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
*DH1B040A9H21B
4 - HIGH - Black 1156 1128 1100 1072 1043 1012 981 917 852
3 - MED-HIGH - Blue 935 859 859 828 797 757 717 679 641
2 - MED-LOW - Yellow** 835 803 771 736 701 652 602 569 536
1 - LOW - Red 752 726 700 648 596 554 511 471 431
*DH1B065A9H31B
4 - HIGH - Black 1455 1404 1352 1299 1232 1174 1101 1025 916
3 - MED-HIGH - Blue** 1375 1350 1320 1270 1215 1153 1099 1014 934
2 - MED-LOW - Yellow 1099 1076 1044 1021 994 968 941 904 874
1 - LOW - Red 838 799 773 744 706 675 628 599 558
*DH1C085A9H41B
4 - HIGH - Black 1795 1763 1732 1701 1669 1627 1575 1514 1451
3 - MED-HIGH - Blue** 1686 1655 1619 1586 1554 1525 1494 1458 1415
2 - MED-LOW - Yellow 1395 1362 1328 1289 1258 1225 1186 1151 1115
1 - LOW - Red 1179 1141 1094 1059 1019 970 931 888 846
*DH1D110A9H51B
4 - HIGH - Black 2105 2063 2010 1951 1880 1802 1721 1630 1543
3 - MED-HIGH - Blue** 1880 1853 1817 1785 1747 1708 1649 1579 1499
2 - MED-LOW - Yellow 1756 1718 1688 1647 1616 1576 1546 1505 1468
1 - LOW - Red 1582 1553 1509 1473 1433 1397 1362 1317 1282
*= First letter may be "A" or "T"
** = Factory Set Heat Speed Tap Setting
CFM VS. TEMPERATURE RISE
MODEL
CFM (CUBIC FEET PER MINUTE)
600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
*DH1B040A9H21B 59 50 44 39 35 32 29
*DH1B065A9H31B 53 48 44 41 38 35
*DH1C085A9H41B 59 54 50 47 44 41 39
*DH1D110A9H51B 65 60 57 54 51 48 46
* May be "A" or "T"

UH1-H-SF-1E 13
Service Facts
ABNORMAL CONDITIONS
1. EXCESSIVE COMBUSTION VENT PRESSURE OR
FLUE BLOCKAGE
If pressure against the induced draft blower outlet be-
comes excessive, the pressure switch will shut off the
gas valve until acceptable combustion pressure is again
available.
2. LOSS OF FLAME OR GAS SUPPLY FAILURE
If loss of flame occurs during a heating cycle (when flame
is not present at the sensor), the control module will retry
the ignition sequence up to two times after the sensor
cools. If ignition is not achieved, it will lockout the furnace.
3. POWER FAILURE
If there is a power failure during a heating cycle, the sys-
tem will restart the ignition sequence automatically when
power is restored, if the thermostat still calls for heat.
4. INDUCED DRAFT BLOWER FAILURE
If pressure is not sensed by the pressure switch, it will
not allow the gas valve to open, therefore the unit will not
start. If failure occurs during a running cycle, the pressure
switch will cause the gas valve to close and shut the unit
down.
▲WARNING
!
The following warning complies with State of California law, Proposition 65.
This product contains fiberglass wool insulation!
Fiberglass dust and ceramic fibers are believed by the
State of California to cause cancer through inhalation.
Glasswool fibers may also cause respiratory, skin, or
eye irritation.
▲WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a com-
mercially available soap solution made specifically for
the detection of leaks to check all connections. A fire or
explosion may result causing property damage, personal
injury, or loss of life.
INTEGRATED FURNACE CONTROL ERROR FLASH CODES
Flashing Slow --- Normal - No call for Heat
Flashing Fast --- Normal - Call for Heat
Continuous ON --- Replace IFC
Continuous OFF --- Check Power
2 Flashes --- System Lockout (Retries or Recycles exceeded)
3 Flashes ---
Draft Pressure Error - Possible problems:
a) Venting problem
b) Pressure switch problem
c) Inducer problem
4 Flashes --- Open Temperature Limit Circuit
5 Flashes --- Flame sensed when no flame should be present
6 Flashes --- 115 volt AC power reversed, poor grounding or system voltage too low
7 Flashes --- Gas valve circuit error
8 Flashes --- Low flame sense signal
9 Flashes --- Check Ignitor Circuit and Line "N" to 24VAC "Common" voltage (< 2 volts)
[possible grounding problem]
▲WARNING
!
Should overheating occur, or the gas supply fail to shut
off, shut off the gas valve to the unit before shutting off
the electrical supply.
Failure to follow this warning could result in property
damage, personal injury, or death.

14 UH1-H-SF-1E
Service Facts
Troubleshooting Flowchart Index
15) IFC Component Layout
16) LED Flash Codes
17) Getting started
18) 2 Flash Troubleshooting Retry and Recycle Lockout
20) 3 Flash Troubleshooting Pressure Switch Fault
21) 4 Flash Troubleshooting High Limit and Auxiliary Limit
22) 4 Flash Troubleshooting Roll Out Limit
23) 5 Flash Troubleshooting Flame Sensed Fault
24) 6 Flash Troubleshooting Polarity Revered or Poor Ground Fault
25) 7 Flash Troubleshooting External Gas Valve Circuit Fault
26) 8 Flash Troubleshooting Low Flame Sense Fault
27) 9 Flash Troubleshooting Igniter Faults
28) Constant Torque Motor Troubleshooting
The following pages include troubleshooting flowcharts in
reference to the 90% Single Stage (*UX1-*DX1-A9H) furnaces
ONLY; using the FAULT LED as starting points.
The information contained is for reference only and does not
cover all scenarios or problems that may be encountered by a
qualified field technician.
Only qualified technicians should attempt to install, troubleshoot,
or repair this appliance. Failure to follow all cautions and/or
warnings could result in personal or property damage; including
death.

UH1-H-SF-1E 15
Service Facts
CIR-N
EAC-N
HUM-N
OFF ON
1 2 3
HUM-HXFMR-H
LINE-H CIR-H
CIR-COM
PARKPARKCOOL-H
EAC-HHEAT-H
5 AMPS
1
2
3
4
LINE-IN
IGN-N
IND-N
IGN-H
IND-H
XFMR-N
CNT04711
TWIN YWRGC
TWIN YWRGC
1
2
3
4
Line Voltage Connections
24 volt Furnace
Component
Connections
5 Amp Control Fuse
Low Voltage Terminal Strip
Fault LED (Red)
Dip Switches to
configure Heat/Cool
Delay Options
Integrated Furnace Control
(IFC) Component Layout

16 UH1-H-SF-1E
Service Facts
Fault LED Flash Codes Definitions

UH1-H-SF-1E 17
Service Facts
Is the IFC LED flashing?
Is high voltage
power supplied
to the unit?
Refer to Gas Furnace Silicon Nitride Ignitor
Models Service Manual to supplement this
information.
Publication Number 34-3405-08
NO
NO Replace IFC
YES
Is 24VAC low voltage
present from transformer
and fuse good YES
NO
Repair low voltage
wiring, replace
transformer, or
fuse as needed
Repair high voltage
connection to unit.
What is the fault
light flash code?
See FAULT LED
Flash Codes page
YES
Are connections and
wiring in working
condition?
Repair
connections
NO
Close and hold
door switch
YES
GETTING
STARTED

18 UH1-H-SF-1E
Service Facts
2 Flash Fault LED
Cycle power to
furnace and call
for heat
Does gas
ignite?
YES
NO
Is outlet gas
pressure
~3.5"WC (NG)
~11.0"WC (LP)
YES
Do all burners
ignite within 5
seconds? Check igniter
position and
correct if needed.
Check operation
Adjust manifold gas
pressure to
~3.5"WC (NG)
~11.0"WC (LP)
Check operation
NO
Clean and align
burners correctly.
Check operation
NO
YES
Measure flame
current. Is flame
current less than 1
micro-amp?
(3-4 ua = Normal)
YES
Is flame sensor
located
correctly?
Replace flame
sensor. Check
operation
YES
Correct and check
operation
NO
Flame sensor is
good
NO
Is minimum
outlet gas
manifold
pressure
maintained?
Does inlet gas
pressure drop
more than
2" WC
NO
Correct inlet gas
pressure
Check operation
Replace Gas Valve
Check operation
YES
Disconnect electrical
power to furnace.
Connect manometer
to oulet gas pressure
connector
NO
Cycle power to
furnace and call
for heat
YES
DEFINITION
RETRY Lock Out = 3 unsuccessful tries for
ignition within a single call for heat
Flame has never been sensed
RECYCLE Lock Out = 10 recycles within a
single call for heat.
Flame is sensed & then lost
For CORRECT
positioning of the
igniter and flame
sensor, see figure
on next page
Disconnect electrical
power to furnace.
Connect manometer
to inlet gas pressure
connector
Is inlet gas pressure
above 14" WC or less than
nameplate minimum ?
NO
Correct inlet gas
pressure
Check operation
YES

UH1-H-SF-1E 19
Service Facts
“Hot” Zone - not
centered over
crossover
INCORRECT positioning of
ignitor.
HOT ZONE must be centered
over the cross-over
Ignitor not overlapping burner
(see above)
Correct positioning of
ignitor and flame
sensor.
NOTE the slight over
lap of the ignitor and
the burner
Igniter
slightly
overlapping
OD of burner

20 UH1-H-SF-1E
Service Facts
NO
YES
YES
Is pressure greater
than pressure
switch label?
See Note #2
Replace pressure switch.
Check operation.
Is the inducer
motor running? NO
Is 120 volts measured at
IFC plug between pins
1 (BK/6) and 3 (WH/6)
Is 24 volts present,
measured across PS
(orange to yellow)?
See Note #1
NO
YES
Replace IFC.
Check operation.
Disconnect electrical
power from the furnace
and remove 1 wire from
the pressure switch
Is continuity
measured
across PS?
Replace pressure switch.
Check operation. YES
NO
Note #1
24 volts = Open Switch
0 volts = Closed Switch
DEFINITION
An error has occurred with the P.S.
The error will be reported, indicating that the
pressure switch is either opened or closed,
contrary to normal operating sequence.
In most cases, the pressure switch is not the
problem.
Note: Verify all wiring to pressure
switch is correct per wiring diagram
Note #2
Measured pressure is
negative, greater than
refers to magnitude only.
3 Flash Fault LED
Cycle power to
furnace and call for
heat.
NO
Is Inducer Limit
cool and
contacts open?
Replace Inducer
Limit switch
YES
Replace Inducer.
Check operation.
YES
YES
Reconnect electrical
power to furnace. Cycle
power to furnace and call
for heat.
Pressure
switch is okay
Pressure switch is
okay. Re attach wire
to PS..
Inducer limit switch
is open.
Allow time for Inducer
Limit to cool and
investigate cause for
high vent temperatures.
Check PS hose, flue piping for
obstruction and/or confirm vent size
is correct. Inspect heat exchanger.
Is 120 volts measured at
the inducer motor
between wires (BK) and
(WH/6)?
See IFC Component Layout for
location of plug.
Is 120 volts
measured across
the inducer limit
switch?
NO YES
Repair wiring. Check
operation.
NO