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AUH2B080A9V4VA
Installer's Manual
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Trane AUH2B060A9V3VA, AUH2B080A9V3VA, AUH2B080A9V4VA, AUH2C100A9V4VA, AUH2C100A9V5VA Service Facts

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Page 1
Service Facts
UH2-SF-1G
Gas Furnace – Var. Speed Blower –
AVAILABLE IN FRENCH CANADIAN (FC)
Var. Speed Inducer – Two Stage Heat – Direct Vent
Models: * - First letter may be “A” or “T”
X343070P08
*UH2B060A9V3VA *UH2B080A9V3VA *UH2B080A9V4VA *UH2C100A9V4VA
*UH2C100A9V5VA *UH2D120A9V5VA *DH2B060A9V3VA *DH2B080A9V3VA
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.
WARNING
DISCONNECT POWER BEFORE SERVICING
PRODUCT SPECIFICATIONS
MODEL TYPE RATINGS
1st Stage Input BTUH
1st Stage Capacity BTUH (ICS)
2nd Stage Input BTUH
2nd Stage Capacity BTUH (ICS) AFUE Temp. rise (Min.-Max.) °F.
BLOWER DRIVE
Diameter - Width (In.) No. Used Speeds (No.) CFM vs. in. w.g. Motor HP R.P.M. Volts / Ph / Hz
COMBUSTION FAN - Type
Drive - No. Speeds Motor HP - RPM Volts / Ph / Hz FLA
FILTER — Furnished?
Type Recommended Hi Vel. (No.-Size-Thk.)
VENT — Size (in.) HEAT EXCHANGER
Type -Fir ed
-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
Ampacity (In Amps) Max. Overcurrent Protection (Amps)
PIPE CONN. SIZE (IN.) DIMENSIONS
Crated (In.)
WEIGHT
Shipping (Lbs.) / Net (Lbs)
1 Central Furnace heating designs are certified to ANSI Z21.47 / CSA 2.3. 2 For 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.
3 Based on U.S. government standard tests. 4 The above wiring specifications are in accordance with National Electrical Code; however, installations must comply with local codes.
*UH2B060A9V3VA
Upflow / Horizontal
39,000 37,830 60,000 58,200
97
35 - 65
DIRECT
10 x 8
1
Variable
See Fan Performance Table
1/2
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
1 - 17x25 - 1 in.
2 Round
Aluminized Steel - Type I
20
3 — 45 3 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
3
115/1/60
11.1 15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
158 / 146
*DH2B080A9V4VA *DH2C100A9V4VA *DH2D120A9V5VA
*UH2B080A9V3VA
Upflow / Horizontal
52,000
50.440 80,000 77,600
97
35 - 65
DIRECT
10 x 8
1
Variable
See Fan Performance Table
1/2
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
1 - 17x25 - 1 in.
2 Round
Aluminized Steel - Type I
20
4 — 45 4 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
4
115/1/60
11.1 15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
168 / 156
1
*UH2B080A9V4VA
Upflow / Horizontal
52,000 50,440 80,000 77,600
97
35 - 65
DIRECT
11 x 8
1
Variable
See Fan Performance Table
3/4
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
1 - 17x25 - 1 in.
2 Round
Aluminized Steel - Type I
20
4 — 45 4 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
4
115/1/60
13.5 20
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
170 / 158
*UH2C100A9V4VA
Upflow / Horizontal
65,000 62,855
100,000
96,700
97
35 - 65
DIRECT
10 x 10
1
Variable
See Fan Performance Table
3/4
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
1 - 20x25 - 1 in.
3 Round
Aluminized Steel - Type I
20
5 — 45 5 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
5
115/1/60
13.5 20
1/2
H x W x D
41-3/4 x 23 x 30-1/2
197 / 185
NOTICE: The manufacturer has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.
© 2011 Trane All Rights Reserved
Page 2
Service Facts
MODEL TYPE RATINGS
1st Stage Input BTUH
1st Stage Capacity BTUH (ICS)
2nd Stage Input BTUH
2nd Stage Capacity BTUH (ICS) AFUE Temp. rise (Min.-Max.) °F.
BLOWER DRIVE
Diameter - Width (In.) No. Used Speeds (No.) CFM vs. in. w.g. Motor HP R.P.M. Volts / Ph / Hz
COMBUSTION FAN - Type
Drive - No. Speeds Motor HP - RPM Volts / Ph / Hz FLA
FILTER — Furnished?
Type Recommended Hi Vel. (No.-Size-Thk.)
VENT — Size (in.) HEAT EXCHANGER
Type -Fir ed
-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
Ampacity (In Amps) Max. Overcurrent Protection (Amps)
PIPE CONN. SIZE (IN.) DIMENSIONS
Crated (In.)
WEIGHT
Shipping (Lbs.) / Net (Lbs)
PRODUCT SPECIFICATIONS
*UH2C100A9V5VA
Upflow / Horizontal
65,000 62,855
100,000
96,700
96.7
35 - 65
DIRECT
11 x 10
1
Variable
See Fan Performance Table
1 Variable 115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
1 - 20x25 - 1 in.
3 Round
Aluminized Steel - Type I
20
5 — 45 5 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
5 115/1/60
16.3 20
1/2
H x W x D
41-3/4 x 23 x 30-1/2
199 / 187
See Fan Performance Table
Aluminized Steel - Type I
41-3/4 x 26-1/2 x 30-1/2
1
*UH2D120A9V5VA
Upflow / Horizontal
78,000
75,426 120,000 116,040
96.7
40 - 70 DIRECT
10 x 10
1
Variable
1
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
1 - 24x25 - 1 in.
3 Round
20
6 — 45 6 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
6
115/1/60
15.2 20
1/2
H x W x D
206 / 193
*DH2B060A9V3VA
Downflow / Horizontal
39,000 37,000 60,000 57,000
95
35 - 65
DIRECT
10 x 8
1
Variable
See Fan Performance Table
1/2
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0 Yes
High Velocity
2 - 14x20 - 1 in.
2 Round
Aluminized Steel - Type I
20
3 — 45 3 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
3
115/1/60
11.1 15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
160/ 146
1 Central Furnace heating designs are certified to ANSI Z21.47 / CSA 2.3. 2 For 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.
3 Based on U.S. government standard tests. 4 The above wiring specifications are in accordance with National Electrical Code; however, installations must comply with local codes.
2
X343070P08
Page 3
Service Facts
MODEL TYPE RATINGS
1st Stage Input BTUH
1st Stage Capacity BTUH (ICS)
2nd Stage Input BTUH
2nd Stage Capacity BTUH (ICS) AFUE Temp. rise (Min.-Max.) °F.
BLOWER DRIVE
Diameter - Width (In.) No. Used Speeds (No.) CFM vs. in. w.g. Motor HP R.P.M. Volts / Ph / Hz
COMBUSTION FAN - Type
Drive - No. Speeds Motor HP - RPM Volts / Ph / Hz FLA
FILTER — Furnished?
Type Recommended Hi Vel. (No.-Size-Thk.)
VENT — Size (in.) HEAT EXCHANGER
Type -Fir ed
-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
Ampacity (In Amps) Max. Overcurrent Protection (Amps)
PIPE CONN. SIZE (IN.) DIMENSIONS
Crated (In.)
WEIGHT
Shipping (Lbs.) / Net (Lbs)
PRODUCT SPECIFICATIONS
*DH2B080A9V3VA
Downflow / Horizontal
52,000 49,400 80,000 76,000
95
35 - 65
DIRECT
10 x 8
1
Variable
See Fan Performance Table
1/2
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
2 - 14x20 - 1 in.
2 Round
Aluminized Steel - Type I
20
4 — 45 4 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
4
115/1/60
11.1 15
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
168 / 158
*DH2B080A9V4VA
Downflow / Horizontal
52,000 49,500 80,000 76,000
95
35 - 65
DIRECT
11 x 8
1
Variable
See Fan Performance Table
3/4
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
2 - 14x20 - 1 in.
2 Round
Aluminized Steel - Type I
20
4 — 45 4 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
4
115/1/60
13.5 20
1/2
H x W x D
41-3/4 x 19-1/2 x 30-1/2
172 / 160
1
*DH2C100A9V4VA
Downflow / Horizontal
65,000 61,750
100,000
95,000
95
35 - 65
DIRECT
10 x 10
1
Variable
See Fan Performance Table
3/4
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
2 - 16x20 - 1 in.
3 Round
Aluminized Steel - Type I
20
5 — 45 5 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
5
115/1/60
13.5 20
1/2
H x W x D
41-3/4 x 23 x 30-1/2
185 / 175
*DH2D120A9V5VA
Downflow / Horizontal
78,000
74,000 120,000 114,000
95
40 - 70 DIRECT
10 x 10
1
Variable
See Fan Performance Table
1
Variable
115/1/60
Centrifugal
Direct - Variable
1/50 - 5000
33 - 110/3/60 - 180
1.0
Yes
High Velocity
2 - 16x20 - 1 in.
3 Round
Aluminized Steel - Type I
20
6 — 45 6 — 56
Redundant - Two Stage
Hot Surface Igniter
Multiport Inshot
6
115/1/60
15.2 20
1/2
H x W x D
41-3/4 x 26-1/2 x 30-1/2
206 / 196
1 Central Furnace heating designs are certified to ANSI Z21.47 / CSA 2.3. 2 For 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.
3 Based on U.S. government standard tests. 4 The above wiring specifications are in accordance with National Electrical Code; however, installations must comply with local codes.
X343070P08
3
Page 4
Service Facts
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SAFETY SECTION
!
WARNING
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
ELECTRIC SHOCK HAZARD 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.
!
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 COMMERCIALLY 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.
!
WARNING
EXPLOSION HAZARD PROPANE GAS IS HEAVIER THAN AIR AND MAY COL­LECT IN ANY LOW AREAS OR CONFINED SPACES. IF THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED AREA OR A CONFINED SPACE, IT IS STRONGLY RECOMMENDED TO CONTACT A GAS SUPPLIER TO INSTALL A GAS DETECTING WARNING DEVICE IN CASE OF A GAS LEAK
NOTE: The manufacturer of your furnace does NOT test any
detectors and makes no representations regarding any brand or type of detector.
!
WARNING
SAFETY HAZARD 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
ELECTRIC SHOCK HAZARD DISCONNECT POWER TO THE UNIT BEFORE REMOVING THE BLOWER DOOR. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN AN PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH.
4
X343070P08
Page 5
Service Facts
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The following warning complies with State of California law, Proposition 65.
!
WARNING
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.
Skin Contact – Wash affected areas gently with soap
EXPLOSION HAZARD 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
BURN HAZARD DO NOT TOUCH IGNITER. IT IS EXTREMELY HOT. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN SEVERE BURNS.
RISK OF ELECTRIC SHOCK: THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT PERFORM ANY SERVIC­ING OTHER THAN THAT CONTAINED IN THESE OPERAT­ING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
The integrated furnace control is polarity sensitive. The hot leg of the 115 VAC power must be connected to the BLACK field lead.
If symptoms persist, seek medical attention.
and warm water after handling.
!
WARNING
!
WARNING
!
WARNING
!
CAUTION
!
CAUTION
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
!
CAUTION
Do NOT touch igniter. It is extremely hot.
SEQUENCE OF OPERATION
!
WARNING
EXPLOSION HAZARD 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
!
WARNING
SAFETY HAZARD 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.
COMFORT CONTROL CALL FOR HEAT (2-STAGE COMFORT CONTROL)
Call for 1st Stage only:
W1 Comfort Control contacts close signaling the control module to run its self-check routine. After the control module has verified that the 1st Stage 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 approx. 20 seconds, then the Gas Valve is energized in 1st Stage to permit gas flow to the burners.
The flame sensor confirms that ignition has been achieved within the 4 second ignition trial period.
As the flame sensor confirms that ignition has been achieved, the delay to fan ON period begins timing and after approx. 45 seconds the indoor blower motor will be energized at low speed and will continue to run during the heating cycle.
Call for 2nd Stage after 1st Stage:
W2 Comfort Control contacts close signaling a call for 2nd Stage Heat. After a 30 second delay, the induced draft blower will be energized on high speed and the 2nd Stage Pressure Switch contacts will close. The Gas Valve is energized in 2nd Stage and the indoor blower motor in high speed.
X343070P08
5
Page 6
Service Facts
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2nd Stage satisfied, 1st Stage still called:
W2 Comfort Control contacts open signaling that 2nd Stage Heating requirements are satisfied. The induced draft blower is reduced to low speed allowing the 2nd Stage Pressure Switch contacts to open and the Gas Valve is reduced to 1st Stage. The indoor blower motor is reduced to low speed.
1st stage satisfied:
W1 Comfort Control contacts open signaling that 1st Stage heating requirements are satisfied. The Gas Valve will close 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 de­energized by the control module.
Comfort Control call for heat (1-Stage Comfort Control)
W1/ W2 (jumpered) Comfort Control contacts close signaling a call for heat. 1st Stage sequence of operation remains the same as above. 2nd Stage Heat will energize after the Stage delay timer (adjustable) has expired.
Comfort Control satisfied:
W1/ W2 (jumpered) contacts close signaling the control module to close the Gas Valve. The induced draft blower is switched to low speed and de-energized after the post purge timer has expired. The indoor blower motor will continue to operate after the flames are extinguished and then is switched to low heat speed for the FAN-OFF period.
Table 1 and Figure 1 explain the delay-off settings:
Table 1
COOLING OFF - DELAY OPTIONS
SWITCH SETTINGS SELECTION
5 - OFF 6 - OFF NONE SAME
5 - ON 6 - OFF 1.5 MINUTES 100% *
5 - OFF 6 - ON 3 MINUTES 50%
5 - ON 6 - ON ** 50 - 100%
* - This setting is equivalent to BAY24X045 relay benefit
** - This selection provides ENHANCED MODE, which is a ramping up and ramping down of the blower speed to provide improved comfort, quietness, and potential energy savings. See Wiring Diagram notes on the unit or in the Service Facts for complete wiring setup for ENHANCED MODE. The graph which follows, shows the ramping process.
100% if necessary
80%
Dehumidify
50%
NOMINAL AIRFLOW
50%
INDOOR BLOWER TIMING
!
WARNING
SAFETY HAZARD 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 TECHNICIAN’S RESPONSIBILITY TO RECOGNIZE THESE HAZARDS AND PROCEED SAFELY.
!
CAUTION
The integrated furnace control is polarity sensitive. The hot leg of the 115 VAC power must be connected to the BLACK field lead.
Heating: The integrated furnace 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 SW-2, #1 and #2 at 60, 100, 140, or 180 seconds. The factory setting is 100 seconds.
W1-W2 stage delay (jumpered together) is field selectable by dip switch SW-1, #1 and #2 at .5, 5, 10 or 15 minutes. The factory setting is 10 minutes. (See wiring diagram).
Cooling: The fan delay-off period is set by dip switches on the Integrated Furnace Control. The options for cooling delay off is field selectable by dip switches #5 and #6.
OFF
Fast Coil Cooling
1
minute
minutes
7.5
Efficiency
OFF
3
minutes
Figure 1
6
X343070P08
Page 7
PERIODIC SERVICING REQUIREMENTS
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Service Facts
!
WARNING
ELECTRIC SHOCK HAZARD DISCONNECT POWER TO THE UNIT BEFORE REMOVING THE BLOWER DOOR. ALLOW A MINIMUM OF 15 SECONDS FOR IFC POWER SUPPLY TO DISCHARGE TO 0 VOLTS. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN PERSONAL INJURY FROM MOVING PARTS.
!
WARNING
CARBON MONOXIDE POISONING HAZARD FAILURE TO FOLLOW THE SERVICE AND/OR PERIODIC MAINTENANCE INSTRUCTIONS FOR THE FURNACE AND VENTING SYSTEM, COULD RESULT IN CARBON MONOX­IDE POISONING OR DEATH.
!
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 COMMERCIALLY 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.
!
CAUTION
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and danger­ous operation. Verify proper operation after servicing.
1. GENERAL INSPECTION – Examine the furnace installation 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
furnace.
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 operating conditions do not require servicing. If motor lubrication is required it should only be done by a qualified servicer. 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.
!
CAUTION
Do NOT touch igniter. It is extremely hot.
4. IGNITER – This unit has a hot surface direct ignition device that automatically lights the burners. Please note that it is very fragile and should be handled with care.
5. BURNER – Gas burners do not normally require sched­uled 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 burner box cover (6 to 8 screws) and 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. Reas­semble parts by reversal of the above procedure. The burner box must be resealed when replacing box cover.
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 annually using brushes and vacuum cleaner.
NOTE: On LP (propane) units, due to variations in BTU content and altitude, servicing may be required at shorter intervals.
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 operation. 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. Some discoloration of PVC pipe is normal.
c. Remove burner compartment door from furnace.
d. Inspect around insulation covering flue collector box.
Inspect induced draft blower connections from recu­perative cell and to the flue pipe connection.
e. Remove burners. (See Item 5.)
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 the heat exchanger should
be cleaned by a qualified service technician.
h. After inspection is complete replace burner box cover,
burners, and furnace door.
i. Restore gas supply. Check for leaks using a soap
solution. Restore electrical supply. Check unit for normal operation.
7. COOLING COIL CONDENSATE DRAIN – If a
cooling 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 condensate cannot drain freely water damage can occur. (See Condensate Drain in Installer’s Guide)
X343070P08
7
Page 8
Service Facts
*UH2 WIRING DIAGRAM
8
From drawing D344303
X343070P08
Page 9
*UH2 SCHEMATIC DIAGRAM2
Service Facts
X343070P08
From drawing D344303
9
Page 10
Service Facts
*DH2 WIRING DIAGRAM
10
From drawing D344304
X343070P08
Page 11
*DH2 SCHEMATIC DIAGRAM
Service Facts
X343070P08
From drawing D344304
11
Page 12
Service Facts
Q
uick
These service procedures will work on ECM-2TM motors and their motor control board and their 16 Wire Low Voltage Control Cable.
1. J
umper
L
ow Voltage Terminal board
D
oes motor run
24 V
olt
A.C. "R" T
?
C
heck
M
otor
W
ill
ECM -2TM QUICK CHECK
B
lower
M
otor
erminal to
.
W
"G"
ill Not
terminal on the
N
R
ot
un
R
un
NO: YES:
check Comfort Control and Comfort Control wire.
2. U J
D
NO: YES:
Go to step #2.
Motor runs,
nplug
umper
oes the motor run
Go to step #3.
Replace the variable speed interface board on the furnace.
16
24 V
wire low voltage harness from the interface board
olts
A.C. to
?
Jumper
pins
#12, #15
and common pins
#1
and
.
#3.
24 V.A.C.
12
#9 PIN WIRE IS ORANGE
#1 PIN WIRE IS BLUE
To Pin #12
To Pin #15
To Pin #1 & #3
X343070P08
Page 13
3. U
nplug
umper
J
and
#15
D
oes motor run
16
24 V
and pins
Q
uick
wire low voltage harness fr om the motor
olts
A.C. to
#1
C
heck
motor low voltage plug pins
and
#3
M
otor
which are common
W
ill
N
.
ot
?
Service Facts
R
un
.
#12
NO: YES:
Go to step #4.
Fault is in the 16 wire low voltage harness. Repair or replace it.
4. Is
pin
the line voltage to the motor high voltage power plug
#4
and pin
#5
correct
24 VOLT A.C.
TO PIN #1 & #3
?
NO: YES:
Correct line voltage fault.
Live voltage correct and motor will not run. Replace motor.
X343070P08
#3
#4
#5
GROUND
TO PIN #4
A.C. VOLTS
TO PIN #5
13
Page 14
Service Facts
TROUBLESHOOTING ECM-2™ MOTOR
WITH TROUBLESHOOTING CIRCUIT BOARD
Trouble Shooting Kit
AND 4 WIRE TEST CABLE
ECM-2™ TROUBLESHOOTER KIT
Order Pub. No. 34-3403-01
Purpose: Verify proper signals are being received by the motor control board and are being
sent to the ECM-2™ Motor by the 16 wire low voltage motor harness.
1. Turn power off
2. Disconnect all low voltage field wiring, set all dip switches to “OFF”.
3. Disconnect the 16-pin connector at the ECM-2™ Motor. Plug in the “Troubleshooter” to the harness.
4. Turn on power.
5. The troubleshooter “R” L.E.D. on the board should be on.
6. If the troubleshooter “R” L.E.D. is not on, check for 24 volts A.C. at the motor control board.
7. If 24 volts A.C. is not present, troubleshoot and repair as needed.
14
8. If 24 volts A.C. is present, check the trouble­shooter “R” L.E.D. and check continuity of the 16 wire cable, pin 1 to pin 1, through pin 16. If troubleshooter “R” L.E.D. is good and 16 wire cable pin #1 and pin #12 are good, repair or replace motor control board.
9. The green “C.F.M.” L.E.D.’s should be flashing on the motor control board and troubleshooting board. If the green CFM L.E.D. on the motor control board does not flash, check the troubleshooter “CFM” L.E.D. and continuity of the 16 wire harness, pin #8 and #16. If troubleshooter “CFM” L.E.D. and harness are good, replace motor control board.
X343070P08
Page 15
Trouble Shooting Kit
Dip Switch Operation
10. In order, turn on dip-switches 1 through 8, one at a time.
11. Verify that the corresponding L.E.D. on the trouble shooter is being turned on: Dip switch 1 on, L.E.D. DS­1 is on.
12. Turn off dip switches 1 through 8 and verify each L.E.D. goes off.
13. If the correct L.E.D.s do not turn on and off in the proper sequence, check continuity of the 16 wire harness with ohmmeter: pin 1 goes to pin 1, pin 2 to pin 2, etc. through pin 16. If harness is good, replace motor control board. If harness is bad, repair or re-
place.
Low Voltage Comfort Control Operation
14. Verify thermostat signals by jumping "R" to each of the low voltage terminal connections as follows: BK, O, YLO, G, W1, W2, W3. See exceptions below for furnaces and retro fit motor control boards. The corre­sponding L.E.D. on the troubleshooter should light when "R" is applied. Verify L.E.D.s on the motor control board light according to the applied signal: BK, YYLO, fan. If L.E.D. on motor control board does not light and 16 wire harness is good, replace board.
Service Facts
Furnace
W2 will not light W2 L.E.D. on the troubleshooter due to White-Rodgers ignition control's normally open switch.
Retro Fit Motor Control Board
Retro fit motor control board W2 is not connected and will not light W2 on troubleshooter.
X343070P08
15
Page 16
Service Facts
*UH2B060A9V3V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * First letter may be "A" or "T" ** Factory setting
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
1st Stage Capacity = 2nd Stage Capacity =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
600
57 85
700
49 90
775
44
105
870
39
135
860
61
140
1000
53
190
1125
47
250
1250
42
340
600
110
700
130
775
155
870
185
920
200
1000
255
1125
315
1250
405
57
49
44
39
57
53
47
42
37,830 58,200
600
57
155
700
49
175
775
44
195
870
39
235
920
57
245
1000
53
305
1125
47
370
1250
42
445
600
57
190
700
49
210
775
44
240
870
39
290
920
57
300
1000
53
340
1025
51
355
1100
48
390
-
-
-
-
670
79
245
700
75
255
775
68
285
1000
53
355
*UH2B060A9V3V FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
1.5
2.0
2.5
3
AIRFLOW
SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
ON ON OFF ON
ON ON OFF OFF
ON ON ON OFF
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
575
65
640
70
700
85
700 100
800 115
900 140
875 130
1000
175
1125
235
1050
195
1200
275
1325
360
575
90
640 110
700 125
700 130
800 155
900 195
875 180
1000
235
1125
295
1050
260
1200
330
1325
425
575 125
640 140
700 160
700 170
800 200
900 240
875 230
1000
285
1125
345
1050
305
1200
385
1300
460
NOTES: * First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
550 155
630 175
700 200
700 210
800 250
900 290
875 270
1000
335
1100
370
1050
350
1100
385
1175
425
-
-
-
-
-
-
-
900 310
925 318
920 315
940 330
1000
365
16
X343070P08
Page 17
Service Facts
*UH2B080A9V3V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW
SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * First letter may be "A" or "T" ** Factory setting
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
1st Stage Capacity =
2nd Stage Capacity =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
800
56
105
860
52
115
960
46
150
1080
41
195
1100
62
205
1210
57
265
1360
50
365
1360
50
355
800
140
880
165
990
200
1110
255
1100
260
1240
340
1390
445
1390
450
56
45
40
62
55
49
49
51
50,440 77,600
800
56
180
890
50
215
1000
44
230
1120
40
315
1120
61
320
1260
54
410
1400
49
500
1400
49
520
800
56
220
920
48
265
1020
44
310
1120
40
365
1120
61
370
1260
54
470
1360
50
535
1350
51
535
800
56
265
910
49
320
1010
44
350
1080
41
390
1090
63
400
1130
61
430
1210
57
475
1180
58
465
*UH2B080A9V3V FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
2.0
2.5
3.0
3.5
AIRFLOW SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
ON ON OFF ON
ON ON OFF OFF
ON ON ON OFF
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
750
84
840 109
940 136
850 113
960 150
1080
195
1020
175
1170
240
1290
310
1170
250
1360
365
1360
355
750 122
840 146
940 177
850 150
990 200
1110
255
1020
225
1180
300
1320
410
1190
315
1390
445
1390
450
750 154
840 181
940 215
870 200
1000
230
1120
315
1040
280
1200
365
1350
470
1210
370
1400
500
1400
520
1020
1120
1050
1200
1340
1210
1360
1350
NOTES: * First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
720 185
840 226
940 274
890 250
305
365
330
415
520
435
535
535
710 221
820 264
940 318
890 295
1010
350
1080
390
1050
375
1130
420
1150
440
1100
405
1210
475
1180
460
X343070P08
17
Page 18
Service Facts
*UH2B080A9V4V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * First letter may be "A" or "T" ** Factory setting
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
1st Stage Capacity =
2nd Stage Capacity =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
800
56
105
860
52
115
960
46
150
1080
41
195
1100
62
205
1210
57
265
1360
50
365
1360
50
355
800
140
880
165
990
200
1110
255
1100
260
1240
340
1390
445
1390
450
56
45
40
62
55
49
49
51
50,440 77,600
800
56
180
890
50
215
1000
44
230
1120
40
315
1120
61
320
1260
54
410
1400
49
500
1400
49
520
800
56
220
920
48
265
1020
44
310
1120
40
365
1120
61
370
1260
54
470
1360
50
535
1350
51
535
800
56
265
910
49
320
1010
44
350
1080
41
390
1090
63
400
1130
61
430
1210
57
475
1180
58
465
*UH2B080A9V4V FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
2.5
3.0
3.5
4.0
AIRFLOW
SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
ON ON OFF ON
ON ON OFF OFF
ON ON ON OFF
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
857
107
970
158
1082
209
1004
153
1163
249
1323
345
1176
254
1356
379
1536
503
1376
374
1562
530
1768
757
849
143
971
205
1093
266
1019
210
1173
311
1328
411
1188
317
1362
446
1536
575
1367
429
1562
604
1759
830
841 179
973 251
1104
323
1035
267
1184
372
1332
477
1200
380
1368
514
1536
647
1359
483
1563
677
1749
902
1099
1038
1179
1320
1195
1353
1512
1354
1654
NOTES: * First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
833 223
966 298
374
321
426
532
437
568
699
547
1531
720
866
825 266
960 345
1095
424
1041
374
1174
480
1307
586
1190
494
1339
623
1488
751
1348
611
1499
765
1559
829
18
X343070P08
Page 19
Service Facts
*UH2C100A9V4V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW
SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * First letter may be "A" or "T" ** Factory setting
MEDIUM LOW OFF ON
MEDIUM ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
MEDIUM ** ON OFF
HIGH OFF OFF
1st Stage Capacity =
2nd Stage Capacity =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
873
64
100
971
58
115
1136
49
160
1258
44
225
1260
68
213
1464
59
315
1631
53
450
1846
47
640
893
145
997
170
1146
230
1298
300
1304
305
1471
405
1678
570
1867
760
63
56
49
43
66
59
46
51
62,855 96,700
900
62
195
1006
56
220
1165
48
295
1319
42
390
1329
65
380
1478
58
485
1690
51
670
1794
48
770
899
62
240
1022
55
280
1180
47
365
1328
42
450
1334
65
460
1478
58
560
1579
55
645
1644
52
700
902
62
290
1029
54
335
1184
47
425
1286
44
490
1317
65
510
1350
64
540
1419
61
585
1498
57
650
*UH2C100A9V4V FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
2.5
3.0
3.5
4.0
AIRFLOW SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
ON ON OFF ON
ON ON OFF OFF
ON ON ON OFF
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
808
75
938 100
1058
150
1004
120
1141
170
1336
250
1153
180
1390
285
1575
400
1388
290
1610
415
1847
630
824 125
963 160
1100
200
1010
175
1190
245
1375
330
1206
250
1418
465
1606
495
1423
360
1641
515
1863
735
840 170
959 205
1121
265
1027
230
1214
310
1387
410
1230
320
1439
445
1632
590
1444
440
1666
635
1816
780
1136
1044
1229
1388
1239
1596
1444
1607
1687
NOTES: *First letter may be "A" or "T"
1. At Continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
835 210
964 255
330
285
380
480
395
1441
515
645
515
650
720
830 250
975 310
1142
395
1050
345
1234
450
1384
545
1244
460
1373
540
1445
590
1390
540
1449
595
1532
665
X343070P08
19
Page 20
Service Facts
*UH2C100A9V5V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW
SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * First letter may be "A" or "T" ** Factory setting
MEDIUM LOW OFF ON
MEDIUM ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
MEDIUM ** ON OFF
HIGH OFF OFF
1st Stage Capacity =
2nd Stage Capacity =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
873
64
100
971
58
115
1136
49
160
1258
44
225
1260
68
213
1464
59
315
1631
53
450
1846
47
640
893
145
997
170
1146
230
1298
300
1304
305
1471
405
1678
570
1867
760
63
56
49
43
66
59
46
51
62,855 96,700
900
62
195
1006
56
220
1165
48
295
1319
42
390
1329
65
380
1478
58
485
1690
51
670
1794
48
770
899
62
240
1022
55
280
1180
47
365
1328
42
450
1334
65
460
1478
58
560
1579
55
645
1644
52
700
902
62
290
1029
54
335
1184
47
425
1286
44
490
1317
65
510
1350
64
540
1419
61
585
1498
57
650
*UH2C100A9V5V FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
3.5
4.0
5.0
AIRFLOW
SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
1163
222
1339
331
1515
440
1339
331
1550
471
1744
626
1695
578
1919
862
NA NA
1201
304
1365
400
1538
535
1365
400
1562
550
1758
736
1709
728
1919
958
NA NA
1209
375
1366
477
1549
620
1366
477
1574
645
1770
838
1721
820
1905 1043
NA NA
NOTES: *First letter may be "A" or "T"
1. At Continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
3. NA = Not allowed.
1200
433
1377
555
1553
708
1377
555
1575
733
1772
935
1772
930
1831 1043
NA NA
1199
495
1382
636
1547
796
1382
636
1564
813
1760 1018
1711 1007
1709
982
NA NA
20
X343070P08
Page 21
Service Facts
*UH2D120A9V5V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW
SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * First letter may be "A" or "T" ** Factory setting
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
1st Stage Capacity = 2nd Stage Capacity =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
1090
62
165
1210
56
220
1340
50
295
1430
47
390
1660
63
485
1870
56
675
2060
51
880
2200
48
1030
1120
225
1200
280
1360
350
1570
490
1690
590
1870
745
1990
890
2090
965
60
56
50
43
62
56
53
50
75,426 116,040
1080
63
270
1200
56
330
1370
49
425
1580
43
565
1680
62
640
1810
58
770
1850
57
810
1940
54
895
1070
63
310
1180
57
395
1380
49
495
1570
43
625
1640
64
675
1680
62
715
1710
61
750
1790
58
830
1010
67
380
1160
58
455
1330
51
535
1390
49
565
1460
72
600
1490
70
625
1530
68
665
1640
64
750
*UH2D120A9V5V FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
3.5
4.0
5
AIRFLOW SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
1210
220
1400
305
1590
425
1390
305
1620
420
1840
600
1800
570
2050
845
2160
995
1210
270
1440
390
1600
520
1400
375
1650
530
1830
690
1780
630
2010
875
2040
935
1220
325
1450
465
1610
600
1430
445
1670
595
1820
765
1780
705
1860
805
1920
875
1230
1450
1600
1440
1640
1670
1700
1710
1780
NOTES: * First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
400
510
645
515
660
700
695
735
805
1230
445
1410
560
1380
575
1420
565
1480
600
1490
620
1530
615
1530
655
1620
730
X343070P08
21
Page 22
Service Facts
*DH2B060A9V3V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * First letter may be "A" or "T" ** Factory setting
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
1st STAGE CAPACITY =
2nd STAGE CAPACITY =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
600
56 55
675
50 65
750
45 85
850
40
115
900
58
125
1000
52
170
1100
47
215
1300
40
330
600
675
105
750
125
850
155
900
165
1050
230
1150
285
1325
385
56 85
50
45
40
58
50
45
39
37,000 57,000
600
56
120
675
50
140
750
45
160
850
40
205
900
58
220
1050
50
295
1150
45
340
1325
39
455
600
56
150
675
50
175
750
45
210
850
40
260
900
58
270
1050
50
335
1150
45
395
1250
42
465
600
56
185
675
50
205
750
45
260
850
40
320
900
58
315
1050
50
370
1100
47
440
1200
43
470
*DH2B060A9V3V FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
1.5
2.0
2.5
3
AIRFLOW
SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
ON ON OFF ON
ON ON OFF OFF
ON ON ON OFF
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
525
45
600
55
675
65
700
70
800 100
900 125
875 115
1000
150
1125
215
1050
175
1200
240
1350
330
525
70
600
85
675 105
700 115
800 135
900 165
875 160
1000
207
1125
285
1050
240
1200
315
1350
410
525 100
600 120
625 140
700 145
800 175
900 220
875 210
1000
265
1125
340
1050
305
1200
385
1350
500
NOTES: * First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
525 135
600 150
675 175
700 185
800 225
900 270
875 260
1000
320
1125
395
1050
345
1200
440
1275
485
525 160
600 185
675 205
700 220
800 280
900 330
875 310
1000
380
1125
440
1050
380
1100
410
1170
450
22
X343070P08
Page 23
Service Facts
*DH2B080A9V3V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW
SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * - First letter may be "A" or "T" ** Factory setting *** Above MAX Temperature change value
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
1st STAGE CAPACITY =
2nd STAGE CAPACITY =
800
56
130
900
49
162
1000
44
205
1170
38
305
1150
60
285
1275
54
380
1430
48
515
1430
48
515
800
170
900
210
1000
265
1170
350
1150
345
1275
445
1340
490
1340
490
56
49
44
38
60
54
51
51
49,400 76,000
800
56
210
900
49
260
1000
44
310
1170
38
400
1150
60
385
1200
57
425
1220
56
455
1220
56
455
790
56
245
900
49
295
1000
44
345
1020
44
360
1020
67***
360
1040
66***
380
1090
63
410
1090
63
410
-
-
800
56
295
830
54
310
830
83***
305
900
76***
350
930
74***
380
930
74***
380
*DH2B080A9V3V - FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
2.0
2.5
3.0
AIRFLOW SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
ON ON OFF ON
ON ON OFF OFF
ON ON ON OFF
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
700
95
800 130
900 160
875 145
1000
205
1150
295
1050
235
1200
335
1350
455
700 105
800 160
900 215
875 185
1000
265
1150
340
1050
295
1200
385
1350
480
700 115
800 205
900 255
875 240
1000
310
1150
385
1050
340
1200
410
1210
435
680 200
790 245
900 300
875 280
1000
340
1020
350
1010
350
1040
365
1070
390
NOTES: * First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
670 235
740 265
750 270
760 270
800 295
800 300
800 290
840 310
900 345
X343070P08
23
Page 24
Service Facts
*DH2B080A9V4V FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * - First letter may be "A" or "T" ** Factory setting *** Above MAX Temperature change value
MEDIUM LOW OFF ON
MEDIUM ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
MEDIUM ** ON OFF
HIGH OFF OFF
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
1st STAGE CAPACITY =
2nd STAGE CAPACITY =
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
800
56
130
900
49
162
1000
44
205
1170
38
305
1150
60
285
1275
54
380
1430
48
515
1430
48
515
800
170
900
210
1000
265
1170
350
1150
345
1275
445
1340
490
1340
490
56
49
44
38
60
54
51
51
49,400 76,000
800
56
210
900
49
260
1000
44
310
1170
38
400
1150
60
385
1200
57
425
1220
56
455
1220
56
455
790
56
245
900
49
295
1000
44
345
1020
44
360
1020 67***
360
1040 66***
380
1090
63
410
1090
63
410
-
-
800
56
295
830
54
310
830
83***
305
900
76***
350
930
74***
380
930
74***
380
*DH2B080A9V4V - FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
2.5
3.0
3.5
4.0
AIRFLOW
SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
ON ON OFF ON
ON ON OFF OFF
ON ON ON OFF
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
849
141
953
195
1057
249
999 188
1144
300
1288
412
1156
307
1327
446
1506
634
1327
446
1525
656
1706
906
865
191
965
250
1065
309
1003
241
1150
362
1297
482
1165
374
1335
518
1502
703
1335
518
1522
727
1635
881
881 241
977 305
1073
369
1008
394
1156
423
1305
552
1174
440
1343
589
1498
771
1343
589
1518
797
1563
857
878 294
973 358
1069
422
1018
354
1160
486
1303
617
1177
502
1325
641
1418
746
1325
641
1430
761
1471
813
NOTES: * First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
876 348
970
411
1064
474
1029
414
1165
548
1300
682
1179
563
1307
693
1338
721
1307
693
1341
725
1379
769
24
X343070P08
Page 25
Service Facts
*DH2C100A9V4V - FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW
SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * - First letter may be "A" or "T" ** Factory setting *** Above MAX temperature change
MEDIUM LOW OFF ON
MEDIUM ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
MEDIUM ** ON OFF
HIGH OFF OFF
1st STAGE CAPACITY =
2nd STAGE CAPACITY =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 7 SW 8 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
923
61
110
1020
55
145
1156
48
185
1275
44
225
1298
66
235
1439
60
310
1639
53
430
1790
18
570
955
165
1047
190
1166
240
1305
290
1320
305
1459
390
1650
525
1818
670
59
53
48
43
65
59
52
47
61,750 95,000
960
58
210
1053
53
250
1172
48
300
1328
42
365
1335
65
380
1482
58
470
1650
52
600
1813
47
770
958
58
265
1042
54
295
1177
48
350
1328
42
445
1343
64
445
1483
58
550
1644
52
680
1708
50
750
947
59
310
1029
54
350
1178
48
420
1328
42
510
1343
64
520
1470
59
610
1496
58
640
1535
56
675
*DH2C100A9V4V - FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
2.5
3.0
3.5
4.0
AIRFLOW SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
ON ON OFF ON
ON ON OFF OFF
ON ON ON OFF
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
870 100
989 120
1124
175
1053
145
1186
195
1336
255
1216
190
1394
270
1579
395
1377
270
1599
425
1801
580
885 140
1018
180
1139
225
1075
200
1205
255
1366
340
1225
255
1422
360
1604
475
1412
355
1624
510
1818
690
887 185
1016
230
1130
275
1070
245
1220
310
1383
405
1235
320
1436
430
1610
555
1426
430
1636
585
1815
775
881
230
1012
285
1135
335
1070
295
1220
370
1385
470
1240
385
1437
505
1599
645
1433
510
1618
670
1694
735
NOTES: * - First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
876 270
999 325
1135
390
1049
350
1216
440
1381
545
1243
445
1430
580
1517
640
1428
575
1512
635
1525
660
X343070P08
25
Page 26
Service Facts
*DH2D120A9V5V - FURNACE HEATING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
AIRFLOW SETTING
LOW ON ON
HEATING
1ST
STAGE
HEATING
2ND
STAGE
NOTES: * First letter may be "A" or "T" ** Factory setting
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
LOW ON ON
MEDIUM LOW OFF ON
NORMAL ** ON OFF
HIGH OFF OFF
1st STAGE CAPACITY =
2nd STAGE CAPACITY =
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 8 SW 7 0.1 0.3 0.5 0.7 0.9
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
CFM
TEMP. RISE
WATTS
1025
65
150
1200
56
230
1350
49
280
1550
43
400
1550
66
380
1850
56
660
2050
50
860
2105
49
1000
1025
200
1200
270
1350
340
1550
490
1550
470
1850
750
2000
880
2050
940
65
56
49
43
66
56
50
51
74,000 114,000
1000
67
240
1200
56
330
1350
49
490
1550
43
560
1550
66
540
1850
56
780
1850
56
810
1900
54
880
1000
67
290
1200
56
390
1350
49
470
1550
43
620
1550
66
610
1700
60
720
1700
60
750
1775
58
820
1000
67
340
1200
56
450
1350
49
530
1450
46
600
1450 71***
690
1500
69
640
1550
66
670
1625
63
750
*DH2D120A9V5V - FURNACE COOLING AIRFLOW (CFM) AND POWER (WATTS) VS. EXTERNAL STATIC PRESSURE WITH FILTER
OUTDOOR
UNIT SIZE
(TONS)
3.5
4.0
5
AIRFLOW
SETTING
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
LOW
(350 CFM/TON)
NORMAL
(400 CFM/TON)
HIGH
(450 CFM/TON)
DIP SWITCH SETTING EXTERNAL STATIC PRESSURE
SW 1 SW 2 SW 3 SW 4 0.1 0.3 0.5 0.7 0.9
OFF ON OFF ON
OFF ON OFF OFF
OFF ON ON OFF
ON OFF OFF ON
ON OFF OFF OFF
ON OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
OFF OFF ON OFF
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
1225
240
1400
310
1600
450
1400
300
1600
460
1800
610
1750
580
2000
830
2100
970
1225
280
1400
390
1600
520
1400
380
1600
530
1800
700
1750
640
2000
860
2000
910
1225
340
1400
470
1600
590
1400
450
1600
610
1800
760
1750
720
1850
800
1900
850
1225
400
1400
520
1600
640
1400
520
1600
670
1650
690
1650
680
1700
740
1650
780
NOTES: * - First letter may be "A" or "T"
1. At continuous fan setting: Heating or Cooling airflows are approximately 50% of selected cooling value.
2. LOW airflow (350 cfm/ton) is COMFORT & HUMID CLIMATE setting; NORMAL airflow (400 cfm/ton) is typical setting; HIGH airflow (450 cfm/ton) is DRY CLIMATE setting.
1225
450
1400
570
1450
600
1400
570
1450
600
1500
630
1450
610
1550
660
1600
710
26
X343070P08
Page 27
IFC Error Flash Codes
Service Facts
CFM VS. TEMPERATURE RISE
MODEL
*UH/DH2B060A9V3VA 63 56 51 46 42 39 36 34
*UH/DH2B080A9V3VA *UH/DH2B080A9V4VA
*UH/DH2C100A9V4VA
*UH2C100A9V5VA
*UH/DH2D120A9V5VA 67 63 59 56 53 51 48 46 44 42
* - First letter may be "A" or "T"
800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400
68 61 56 52 48 45 42 40
INTEGRATED FURNACE CONTROL LED FLASH CODES
TM
RED LED - LitePort
DATA - 1 FLASH EVERY 20 SECONDS
2 Flashes --- RETRIES OR RECYCLES EXCEEDED 3 Flashes --- INDUCER OR PRESSURE SWITCH ERROR 4 Flashes --- OPEN LIMIT OR ROLLOUT SWITCH 5 Flashes --- FLAME SENSED WHEN NO FLAME SHOULD BE PRESENT 6 Flashes --- LINE REVERSE POLARITY 7 Flashes --- GAS VALVE CIRCUIT ERROR 8 Flashes --- WEAK FLAME 9 Flashes --- OPEN INDUCER LIMIT ERROR
Cubic Feet Per Minute (CFM)
65 60 56 53 50 47 44 42 40 38 37 35
GREEN LED - STATUS
Slow Flash NORMAL, NO CALL FOR HEAT
Fast Flash NORMAL, CALL FOR HEAT PRESENT
GREEN and RED
LED's on Continuously
FAULT CODE RECOVERY
On power up, last 4 faults, if any, will be flashed on the red LED. The newest fault detected will flash first and the oldest last. There will be a 2 second delay between fault code flashes. Solid red LED error codes will not be displayed.
The Green LED will be on solid during last fault recovery. At any other time the control is powered, the Green LED indica­tor light will operate as shown in the table above and the red LED will flash LitePort data (one flash) every 20 seconds.
INTEGRATED FURNACE CONTROL
FUSE OPEN OR INTERNAL CONTROL FAILURE
Red LitePort Green Status LED
GREEN "STATUS" LED FLASH CODES
Flashing Slow --- Normal - No call for Heat
Flashing Fast --- Normal - Call for Heat
TM
LED
Fault Code Reset
The last 4 fault codes can be erased from memory by power­ing up the control with “G” energized and then applying “R” to the “W1” terminal 3 times within 6 seconds. The control will acknowledge the reset by turning on the red LED for 2 seconds.
X343070P08
*U/DH Integrated Furnace Control
27
Page 28
Service Facts
HUMIDISTAT HOOKUP
If an optional humidistat is to be connected between “R” and “BK”, the factory installed jumper between “R” and “BK” on the circuit board must be cut. If an optional Humidistat is used, the jumper must also be cut when applying an airflow command signal to the “BK” input such as with the variable speed single-zone and multi-zone system controller. On single speed cooling only/non-heat pump systems, jumper “Y” to “O” for proper operation of the delay profiles and the humidistat For two compressor or two speed systems, jumper “Ylo” to “O.”
The factory installed jumper between “R” and “BK” on the circuit board must be cut if an optional Humidistat is installed.
HUMIDISTAT HOOKUP
28
X343070P08
Page 29
Service Facts
Troubleshooting Flowchart Index
30) IFC Component Layout
31) LED Flash Codes
32) Getting started
33) 2 Flash Troubleshooting Retry and Recycle Lockout
35) 3 Flash Troubleshooting Pressure Switch Fault
36) 4 Flash Troubleshooting High Limit and Auxiliary Limit
37) 4 Flash Troubleshooting Roll Out Switch
38) 5 Flash Troubleshooting Flame Sensed Fault
39) 6 Flash Troubleshooting Polarity Revered
40) 7 Flash Troubleshooting External Gas Valve Circuit Fault
41) 8 Flash Troubleshooting Low Flame Sense Fault
42) 9 Flash Troubleshooting Open Inducer Limit
43) VS No Air Flow / Incorrect Air Flow
The following pages include troubleshooting flowcharts in reference to the 95% Two Stage (*UH2) 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.
X343070P08
29
Page 30
Service Facts
1 - BK/6 2 - RD/6 3 - WH/6 4 - N/A
Fault LED (Red)
Integrated Furnace Control
(IFC) Component Layout
CNT05160
CIR-N
1234
LINE-IN
CIR-H
XFMR-H
LINE-H
HUM-N
EAC-N
XFMR-N
Line Voltage Connections
W1/W2 Staging Delay
Heat “Off” Delay
5 Amp Control Fuse
24 Volt Furnace Component Connections
EAC-H
HUM-H
Indoor airflow configuration dip switches
16 pin ECM Connector
5 AMPS
BK W2 W1 R G B/C Y YLO O
Low Voltage Terminal Strip
30
X343070P08
Page 31
Service Facts
Fault LED Flash Codes Definitions
INTEGRATED FURNACE CONTROL LED FLASH CODES
RED LED - LitePort
2 Flashes --- RETRIES OR RECYCLES EXCEEDED 3 Flashes --- INDUCER OR PRESSURE SWITCH ERROR 4 Flashes --- OPEN LIMIT OR ROLLOUT SWITCH 5 Flashes --- FLAME SENSED WHEN NO FLAME SHOULD BE PRESENT 6 Flashes --- LINE REVERSE POLARITY 7 Flashes --- GAS VALVE CIRCUIT ERROR 8 Flashes --- WEAK FLAME
TM
DATA - 1 FLASH EVERY 20 SECONDS
9 Flashes --- OPEN INDUCER LIMIT ERROR
GREEN LED - STATUS
Slow Flash NORMAL, NO CALL FOR HEAT
Fast Flash NORMAL, CALL FOR HEAT PRESENT
GREEN and RED
LED's on Continuously
FUSE OPEN OR INTERNAL CONTROL FAILURE
X343070P08
31
Page 32
Service Facts
GETTING
STARTED
Is high voltage
power supplied
to the unit?
YES
Close and hold
door switch
Is the IFC LED flashing?
YES
What is the fault light flash code?
See FAULT LED
Flash Codes page
NO
NO
Repair high voltage
connection to unit.
Is 24VAC low voltage
present from transformer
and fuse good
NO
Repair low voltage
wiring, replace transformer, or
fuse as needed
YES
Are connections and
wiring in working
condition?
NO
Repair
connections
YES
Replace IFC
32
X343070P08
Page 33
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
Service Facts
2 Flash Fault LED
Disconnect electrical
power to furnace.
Connect manometer
to inlet gas pressure
connector
Clean and align
burners correctly.
Check operation
Is inlet gas pressure
above 14" WC or less than
nameplate minimum ?
NO
Cycle power to
furnace and call
st
for 1
stage heat
Does gas
ignite?
YES
Do all burners ignite within 5
NO
seconds?
YES
Measure flame
current. Is flame
current less than 1
micro-amp?
(3-4 ua = Normal)
NO
YES
YES
Correct inlet gas
Check operation
Is outlet gas
pressure
~1.7"WC (NG)
~6.0"WC (LP)
YES
Check igniter
position and
correct if needed.
Check operation
Is flame sensor
located
correctly?
pressure
YES
NO
YES
Replace flame sensor. Check
operation
Adjust manifold gas pressure to
~1.7"WC (NG)
~6.0"WC (LP)
Check operation
Does inlet gas pressure drop
more than 2"
WC
NO
Disconnect electrical
power to furnace. Connect manometer to oulet gas pressure
connector
YES
Correct inlet gas
pressure
Check operation
NO
Flame sensor is
good
X343070P08
NO
Correct and check
operation
Cycle power to
furnace and call
for heat
Is minimum
outlet gas
manifold pressure
maintained?
NO
Replace Gas Valve
Check operation
33
Page 34
Service Facts
Correct positioning of
ignitor sensor.
NOTE the slight over
lap of the ignitor and
the burner
Igniter slightly overlapping
OD of burner
34
X343070P08
Page 35
DEFINITION An error has occurred with the PS1 or PS2.
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.
3 Flash Fault LED
Service Facts
Note #1
24 volts = Open Switch 0 volts = Closed Switch
Note: Verify all wiring to pressure switch is correct per wiring diagram
YES
nd
stage.
st
Pressure
switch is okay.
NO
Pressure
switch is okay.
While the furnace is operating on 1 stage heat make a call for 2nd stage
heat. Allow (30 seconds) for the
furnace to transition to 2
YES
Is 24 volts present,
measured across PS2
(yellow/7 to brown)?
See Note #1
YES
Cycle power to the furnace
and call for 1
furnace run on
motor running?
Is 24 volts present,
NO
measured across PS1
(orange to yellow/6)?
Is pressure greater
than pressure
st
stage heat.
Does the
st
stage?
1
NO
Is the inducer
YES
See Note #1
YES
switch label?
See Note #2
Disconnect electrical
NO
YES
power from the furnace and remove 1 wire from
each pressure switch
Replace pressure switch.
Check operation.
Note #2
Measured pressure is negative, greater than refers to magnitude only.
YES
Replace pressure switch.
Check operation.
power to furnace. Cycle
power to furnace and call
Is continuity
measured across
PS1 or PS2?
NO
Pressure switches
are okay. Re attach
each wire to PS
Reconnect electrical
st
stage heat.
for 1
Is pressure greater
than pressure
switch label?
See Note #2
Replace pressure switch.
NO
Check PS hose, flue piping
for obstruction and/or
confirm vent size is correct
YES
Check operation.
X343070P08
NO
Check PS hose, flue piping for
obstruction and/or confirm vent
size is correct
NO
Replace or repair wiring
harness. Check operation.
See IFC Component Layout for
location of plug.
YES
Is voltage measured at
inducer motor plug
between pins
1 (BK) – 2 (RD)
2 (RD) – 3 (WH)
1 (BK) – 3 (WH)?
YES
Replace Inducer. Check operation.
Is voltage measured at IFC plug between pins
1 (BK/6) – 2 (RD/6)
2 (RD/6) – 3 (WH/6)
1 (BK/6) – 3 (WH/6)?
NO
Replace IFC.
Check operation.
35
Page 36
Service Facts
DEFINITION
Limit switches are safety devices that will open when an abnormal high temperature has been sensed. REMOVE ALL JUMPER WIRING TO SWITCHES! Under no circumstances, shall these switches be left jumpered when not troubleshooting.
Ignition occurs and
FAN ON delay
begins
Does fan come
on after ~45
seconds?
Replace filter and
clean blower
wheel.
Check operation
Check set screw
position and motor
bearings. Correct
or replace as
needed.
Check operation
Is 120 VAC
measured at IFC
NO
between CIR-H and
CIR-N?
4 Flash Fault LED
Disconnect
electrical power to
furnace
Are filter &
NO
blower wheel
clean?
YES
Does blower
NO
wheel turn
freely?
YES
Cycle power to
furnace and call
for heat
YES
Is 120 VAC measured
at motor between
terminals
4 (WH/7) & 5 (BK/8)?
See next page for
additional 4 flash
faults
Furnace will need to be checked in both 1
Note:
st
& 2nd stage operation.
YES
See ECM motor check out in
Service Facts.
YES
Correct application
or duct issues.
Check operation
NO
Correct gas
pressure
Check operation
YES
Is external
static pressure
greater than
nameplate?
NO
Is heat rise
within
specification?
See Service
Facts
YES
Is outlet
manifold gas pressure within specifications?
NO
YES
NO
Return air
temperature is
above max limit
YES
Is return air temperature above 85 F?
Is temperature at
high limit above
the switch setting?
NO
Replace high limit
switch
High voltage should
always be present.
Check wiring.
YES
NO
Check for loose
insulation or other
NO
objects within
furnace air stream
YES
Make sure any temperature
measuring devices
(thermocouples, dial
thermometers) used to
estimate limit temperature
are within ¼ inch of limit
measurement point
NO
Repair wiring harness.
Check operation
Down Flow Models Only
Reverse flow switch
checkout
Does motor
continue to run
during the entire
heating cycle?
YES
Is temperature at
reverse flow
switch above
specifications?
YES
Check for excessive
reverse flow during an off
cycle
NO
Replace reverse
flow switch
36
X343070P08
Page 37
Service Facts
DEFINITION:
Limit switches are safety devices that will open when an abnormal high temperature has been sensed. REMOVE ALL JUMPER WIRING TO SWITCHES! Under no circumstances, shall these switches be left jumpered when not troubleshooting.
NO
Install correct size
orifices
Check operation
Is the burner orifice
size 56? Or matched
to Installers Guide for
LP?
Correct as needed
Check operation
4 Flash Fault LED
Is a Manual Reset,
Flame Rollout Switch open?
YES
Is LP gas being
YES
YES
YES
used?
NO
Disconnect
electrical power to
furnace
Is flue piping
restricted?
Check burner alignment
Correct as needed
Check operation
YES
NO
Check flue pipe for correct sizing and long horizontal runs or slope
less than ¼” per linear foot.
Correct as needed
Remove, clean, and reassemble
burners.
Push RED reset
on both rollout
switches
Cycle power to
furnace and call
for heat
Ignition occurs
NO
Do all burners
ignite within 5
seconds?
YES
Are flames from
burners impinging
on sides of heat
exchanger?
Are all burner flames
directed into heat exchanger
with a tight pattern?
(inadequately aired burners
tend to roll back)
NO
When fan
comes on, do
flames stay consistent?
YES
Replace Roll out
switch
Check operation
NO
NO
Check combustion air
blower, venting, heat
YES
exchanger for blockage
(i.e. sooting)
Replace heat
exchanger
Check operation
X343070P08
37
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Service Facts
DEFINITION:
Flame is sensed when it should not be sensed.
5 Flash Fault LED
Disconnect
electrical power to
furnace
Turn off gas
supply! Remove
gas valve
Are there signs of
moisture or debris in
the inlet gas screen?
Install drip leg per National Fuel Gas
Code and
Installation
Instructions
NO
YES
Inspect gas supply for leaks and have gas supplier check
gas quality
Is there a drip leg
installed on inlet gas
piping per installation
instructions?
YES
NO
38
Using a back-up wrench,
install new gas valve
Check operation
X343070P08
Page 39
DEFINITION:
Service Facts
Polarity Fault – Incoming high voltage wiring is reversed
6 Flash Fault LED
Disconnect
incoming electrical
power to furnace
Reverse 120 vac
power leads to
furnace wiring
Reconnect power
Check operation
X343070P08
39
Page 40
Service Facts
DEFINITION: External Gas Valve Circuit Error (24 volts is present when it should not be present)
7 Flash Fault LED
Turn Comfort
Control to “OFF”
position
Is 24 VAC nominal voltage
present between Red lead at gas
valve connection to chassis
ground?
YES
Correct wiring
Check operation
NO
Replace IFC
40
X343070P08
Page 41
Service Facts
X343070P08
41
Page 42
Service Facts
Definition: This error is normally caused by improper installation or application of the furnace venting system.
Inducer limit switch is
open.
Allow time for inducer limit to cool.
Verify venting and vent terminations
are within allowable lengths and
clear of any obstructions.
NO
9 Flash Fault LED
Disconnect electrical power
from the furnace and remove
1 wire from the limit switch.
Is continuity
measured across
inducer limit switch?
YES
Verify venting and vent terminations
are within allowable limits and clear
any obstructions.
NO
Is Inducer Limit cool
and contacts open?
YES
Replace Inducer Limit
switch. Check operation
42
X343070P08
Page 43
VS No Air Flow / Incorrect Air Flow
Service Facts
Is the fan wheel
running?
NO
Is the ICM “fan”
LED on?
Is line voltage measured at the
motor per Figure 1?
YES
YES
YES
Does the CFM light flash rate match programmed
NO
NO
air flow?
NO
Is 24 VAC measured
between “R” (transformer
hot) and “B/C” (transformer
common) at the low voltage
field connections?
YES
Is 24 VAC measured
between “G” and “B/C” at the
low voltage connections?
Repair line voltage
wiring.
YES
Verify that dip-switch settings are
correct for the system installed.
AND
Validate low-voltage wiring is
configured for system installed.
Is the proper line
NO
NO
voltage present at
the transformer?
Check thermostat
and wiring to
thermostat.
Does system have
proper air flow?
YES
NO
Check for dirty air filter, duct work damage or restrictions
NO
around the air handler coil and
repair as needed.
YES
Is fuse blown? YES Repl ace fuse.
NO
Repair wiring
between incoming
power supply and
transformer.
Done
Replace
transformer.
Perform “GO” / “NO GO” test per
Figure 2.
Does the motor run?
NO
Perform “GO” / “NO GO”
test per Figure 3
Does the motor run?
NO
Remove motor module and ohm
motor windings
Are motor windings ok (See Note 1)?
YES
NOTE 1:
1) Equal phase to phase resistance.
2) No short to motor case.
Replace control
YES
YES
NO Replace motor
board.
Replace Wire
harness
Replace motor
module
X343070P08
43
Page 44
Trane 6200 Troup Highway Tyler, TX 75707
For more information contact your local dealer
The manufacturer has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.
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