PRODUCT SPECIFICATIONS 1 *UH2B080A942VA

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1 UH2P-SF-1B Gas Furnace Direct Vent Condensing Two Stage Heat Models: * - First letter may be A or T *UH2B060A936VA *UH2B080A942VA *UH2C100A948VA *UH2D120A960VA *DH2B060A936VA *DH2B080A942VA *DH2C100A948VA *DH2D120A960VA * First letter may be A or T 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 MODEL TYPE RATINGS 2 1st Stage Input BTUH 1st Stage Capacity BTUH (ICS) 3 2nd Stage Input BTUH 2nd Stage Capacity BTUH (ICS) 3 Temp. rise (Min.-Max.) F. AFUE 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 - R.P.M Volts / Ph / Hz FLA FILTER Furnished? Type Recommended Hi Vel. (No.-Size-Thk.) VENT Pipe Diameter Min. (in.) 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.) *UH2B060A936VA Upflow / Horizontal 39,000 37,440 60,000 57, DIRECT 10 x See Fan Performance Table 1/ Centrifugal Direct - Variable 1/ /3/ No High Velocity 1-17 x 25-1 in. 2 Round Aluminized Steel - Type I Redundant - Two Stage Hot Surface Ignition Multiport Inshot /2 H x W x D 41-3/4 x 19-1/2 x 30-1/2 150 / 146 PRODUCT SPECIFICATIONS 1 *UH2B080A942VA Upflow / Horizontal 52,000 49,920 80,000 76, DIRECT 10 x See Fan Performance Table 1/ Centrifugal Direct - Variable 1/ /3/ No High Velocity 1-17 x 25-1 in. 2 Round Aluminized Steel - Type I Redundant - Two Stage Hot Surface Ignition Multiport Inshot /2 H x W x D 41-3/4 x 19-1/2 x 30-1/2 158 / 156 *UH2C100A948VA Upflow / Horizontal 65,000 62, ,000 96, DIRECT 10 x See Fan Performance Table 1/ Centrifugal Direct - Variable 1/ /3/ No High Velocity 1-20 x 25-1 in. 2.5 Round Aluminized Steel - Type I Redundant - Two Stage Hot Surface Ignition Multiport Inshot /2 H x W x D 41-3/4 x 23 x 30-1/2 171 / 168 *UH2D120A960VA Upflow / Horizontal 78,000 74, , , DIRECT x See Fan Performance Table 3/ Centrifugal Direct - Variable 1/ /3/ No High Velocity 1-24 x 25-1 in. 3 Round Aluminized Steel - Type I Redundant - Two Stage Hot Surface Ignition Multiport Inshot /2 H x W x D 41-3/4 x 26-1/2 x 30-1/2 205 / 193 * May be "A" or "T" 1 Central Furnace heating designs are certified to ANSI Z21.47 / CSA 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 Trane Inc. All Rights Reserved

2 MODEL TYPE RATINGS 2 1st Stage Input BTUH 1st Stage Capacity BTUH (ICS) 3 2nd Stage Input BTUH 2nd Stage Capacity BTUH (ICS) 3 Temp. rise (Min.-Max.) F. AFUE 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 - R.P.M. Volts / Ph / Hz FLA FILTER Furnished? Type Recommended Hi Vel. (No.-Size-Thk.) VENT Pipe Diameter Min (in.) 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.) *DH2B060A936VA Downflow / Horizontal 39,000 37,050 60,000 57, DIRECT x See Fan Performance Table 1/ Centrifugal Direct - Variable 1/ /3/ No High Velocity 2-14x20-1 in. 2 Round Aluminized Steel - Type I Redundant - Two Stage Hot Surface Ignition Multiport Inshot /2 H x W x D 41-3/4 x 19-1/2 x 30-1/2 155/ 145 PRODUCT SPECIFICATIONS 1 *DH2B080A942VA Downflow / Horizontal 52,000 49,400 80,000 76, DIRECT x See Fan Performance Table 1/ Centrifugal Direct - Variable 1/ /3/ No High Velocity 2-14x20-1 in. 2 Round Aluminized Steel - Type I Redundant - Two Stage Hot Surface Ignition Multiport Inshot /2 H x W x D 41-3/4 x 19-1/2 x 30-1/2 168 / 158 *DH2C100A948VA Downflow / Horizontal 65,000 61, ,000 95, DIRECT x See Fan Performance Table 1/ Centrifugal Direct - Variable 1/ /3/ No High Velocity 2-16x20-1 in. 2.5 Round Aluminized Steel - Type I Redundant - Two Stage Hot Surface Ignition Multiport Inshot /2 H x W x D 41-3/4 x 23 x 30-1/2 185 / 175 *DH2D120A960VA Downflow / Horizontal 78,000 74, , , DIRECT x See Fan Performance Table 3/ Centrifugal Direct - Variable 1/ /3/ No High Velocity 2-16x20-1 in. 3 Round Aluminized Steel - Type I Redundant - Two Stage Hot Surface Ignition Multiport Inshot /2 H x W x D 41-3/4 x 26-1/2 x 30-1/2 206 / 196 * May be "A" or "T" 1 Central Furnace heating designs are certified to ANSI Z21.47 / CSA 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 UH2P-SF-1B

3 SAFETY SECTION! WARNING CARBON MOXIDE 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 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 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. SEQUENCE OF OPERATION 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. 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 de-energized 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 (field selectable at.5, 5, 10 or 15 minutes) has expired. Comfort Control satisfied: W1/W2 (jumpered) contacts open 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. UH2P-SF-1B 3

4 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. Allow a minimum of 10 seconds for IFC power supply to drain to 0 volts. Failure to follow this warning could result in property damage, personal injury or death. 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.! WARNING 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. 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. If symptoms persist, seek medical attention. Skin Contact Wash affected areas gently with soap and warm water after handling.! WARNING Disconnect power to the unit before removing the blower door. Failure to follow this warning could result in personal injury from moving parts. INDOOR BLOWER TIMING 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 factory set at 0 seconds. The option for 80 second delay off is field selectable by dip switch SW-2, #3 (See wiring diagram). TE: Direct drive motors have bearings which are permanently lubricated and under normal use, lubrication is not recommended.! 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. 4 UH2P-SF-1B

5 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. 4. IGNITER This unit has a special hot surface direct ignition device that automatically lights the burners. Please note that it is very fragile and should be handled with care.! WARNING Do T touch igniter. It is extremely hot. Failure to follow this warning could result in severe burns. 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 the top burner bracket. Lift burners from orifices. TE: Be careful T to break igniter when removing burners. Clean burners with brush and/or vacuum cleaner. Reassemble parts by reversal of the above procedure. TE: 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 PERIODIC SERVICING REQUIREMENTS Service Facts required. For best operation, burners must be cleaned annually using brushes and vacuum cleaner. TE: On LP (propane) units, due to variations in BTU content and altitude, servicing may be required at shorter intervals.! WARNING CARBON MOXIDE 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. 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. 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 service technician. h. After inspection is complete replace burners and furnace door. i. Restore gas supply. Check for leaks using a soap solution. Restore electrical supply. Check unit for normal operation.! 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. 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 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 dangerous operation. Verify proper operation after servicing. UH2P-SF-1B 5

6 *UH2 WIRING DIAGRAM From Dwg. D (continued on next page) 6 UH2P-SF-1B

7 *UH2 SCHEMATIC DIAGRAM From Dwg. D UH2P-SF-1B 7

8 *DH2 WIRING DIAGRAM From Dwg. D (continued on next page) 8 UH2P-SF-1B

9 *DH2 SCHEMATIC DIAGRAM From Dwg. D UH2P-SF-1B 9

10 UH2 FURNACE AIRFLOW (CFM) VS. EXTERNAL STATIC PRESSURE (in. w.c.) MODEL SPEED TAP *UH2B060A936VA *UH2B080A942VA *UH2C100A948VA *UH2D120A960VA * - First letter may be "A" or "T" ** = Factory Set Heat Speed Tap Setting 4- HIGH - Black MED.-HIGH - Blue** MED.-LOW - Yellow LOW - Red HIGH - Black MED.-HIGH - Blue** MED.-LOW - Yellow LOW - Red HIGH - Black MED.-HIGH - Blue** MED.-LOW - Yellow LOW - Red HIGH - Black MED.-HIGH - Blue** MED.-LOW - Yellow LOW - Red CFM VS. TEMPERATURE RISE MODEL Cubic Feet Per Minute (CFM) *UH2B060A936VA *UH2B080A942VA *UH2C100A948VA *UH2D120A960VA * - First letter may be "A" or "T" 10 UH2P-SF-1B

11 DH2 FURNACE AIRFLOW (CFM) VS. EXTERNAL STATIC PRESSURE (in. w.c.) MODEL SPEED TAP *DH2B060A936VA *DH2B080A942VA *DH2C100A948VA *DH2D120A960VA * - First letter may be "A" or "T" ** = Factory Set Heat Speed Tap Setting 4- HIGH - Black MED.-HIGH - Blue** MED.-LOW - Yellow LOW - Red HIGH - Black MED.-HIGH - Blue** MED.-LOW - Yellow LOW - Red HIGH - Black MED.-HIGH - Blue** MED.-LOW - Yellow LOW - Red HIGH - Black MED.-HIGH - Blue** MED.-LOW - Yellow LOW - Red CFM VS. TEMPERATURE RISE MODEL Cubic Feet Per Minute (CFM) *DH2B060A936VA *DH2B080A942VA *DH2C100A948VA *DH2D120A960VA * - First letter may be "A" or "T" UH2P-SF-1B 11

12 INTEGRATED FURNACE CONTROL RED LED "ERROR" FLASH CODES 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 Switch 5 Flashes --- Flame sensed when no flame should be present 6 Flashes volt AC power reversed 7 Flashes --- Gas valve circuit error 8 Flashes --- Low flame sense 9 Flashes --- Open Inducer Limit switch 10 Flashes --- Inducer communication error Continuous On --- Solid Red w/solid Green "STATUS" LED Internal Control Failure Fuse Open or Internal Control Failure 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 Table 14 and the Red LED will flash LitePort data (one flash) every 20 seconds. INTEGRATED FURNACE CONTROL GREEN "STATUS" LED FLASH CODES Flashing Slow --- Normal - No call for Heat Flashing Fast --- Normal - Call for Heat 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. Red LitePort LED Green Status LED *UH2 / DH2 Integrated Furnace Control 12 UH2P-SF-1B

13 14) 15) 16) 17) 19) 20) 21) 22) 23) 24) 25) 26) 27) 28) Reversed UH2P-SF-1B 13

14 Integrated Furnace Control (IFC) Component Layout 1 - BK/6 2 - RD/6 3 - WH/6 4 - N/A CNT CIR-N LINE-IN HUM-N EAC-N XFMR-N Line Voltage Connections Fault LED (Red) XFMR-H LINE-H COOL LO HEAT HI HEAT W1/W2 Staging Delay PARK EAC-H HUM-H Heat Off Delay Cool Off Delay Amp Control Fuse 5 AMPS TWIN W2 W1 R G B/C Y 24 Volt Furnace Component Connections Low Voltage Terminal Strip 14 UH2P-SF-1B

15 Fault LED Flash Code Definitions INTEGRATED FURNACE CONTROL RED LED "ERROR" FLASH CODES 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 Switch 5 Flashes --- Flame sensed when no flame should be present 6 Flashes volt AC power reversed 7 Flashes --- Gas valve circuit error 8 Flashes --- Low flame sense 9 Flashes --- Open Inducer Limit switch 10 Flashes --- Inducer communication error Continuous On --- Solid Red w/solid Green "STATUS" LED Internal Control Failure Fuse Open or Internal Control Failure UH2P-SF-1B 15

16 GETTING STARTED Is high voltage power supplied to the unit? Repair high voltage connection to unit. Close and hold door switch Is the IFC LED flashing? Is 24VAC low voltage present from transformer and fuse good Are connections and wiring in working condition? Replace IFC What is the fault light flash code? See FAULT LED Flash Codes page Repair low voltage wiring, replace transformer, or fuse as needed Repair connections 16 UH2P-SF-1B

17 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 2 Flash Fault LED Disconnect electrical power to furnace. Connect manometer to inlet gas pressure connector Is inlet gas pressure above 14" WC or less than nameplate minimum? Correct inlet gas pressure Cycle power to furnace and call for 1 st stage heat Does gas ignite? Is outlet gas pressure ~1.7"WC (NG) ~6.0"WC (LP) Adjust manifold gas pressure to ~1.7"WC (NG) ~6.0"WC (LP) Clean and align burners correctly. Do all burners ignite within 5 seconds? Check igniter position and correct if needed. Does inlet gas pressure drop more than 2" WC Correct inlet gas pressure Measure flame current. Is flame current less than 1 micro-amp? (3-4 ua = Normal) Is flame sensor located correctly? Replace flame sensor. Check operation Disconnect electrical power to furnace. Connect manometer to oulet gas pressure connector Flame sensor is good Correct and check operation Cycle power to furnace and call for 1 st stage heat For CORRECT positioning of the igniter and flame sensor, see figure on next page Is minimum outlet gas manifold pressure maintained? Replace Gas Valve UH2P-SF-1B 17

18 Correct positioning of ignitor sensor. TE the slight over lap of the ignitor and the burner Igniter slightly overlapping OD of burner 18 UH2P-SF-1B

19 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. Note: Verify all wiring to pressure switch is correct per wiring diagram 3 Flash Fault LED Cycle power to the furnace and call for 1 st stage heat. Note #1 24 volts = Open Switch 0 volts = Closed Switch Note #2 Measured pressure is negative, greater than refers to magnitude only. Does the furnace run on 1 st stage? Is the inducer motor running? Disconnect electrical power from the furnace and remove 1 wire from each pressure switch While the furnace is operating on 1 st stage heat make a call for 2 nd stage heat. Allow furnace to transition to 2 nd stage. See SW1-1 and SW1-2 for settings. Replace pressure switch.. Is continuity measured across PS1 or PS2? Pressure switch is okay. Is 24 volts present, measured across PS1 (orange to yellow/6)? See Note #1 Is 24 volts present, measured across PS2 (yellow/7 to brown)? See Note #1 Pressure switch is okay. Is pressure greater than pressure switch label? See Note #2 Replace pressure switch.. Pressure switches are okay. Re attach each wire to PS Reconnect electrical power to furnace. Cycle power to furnace and call for 1 st stage heat. Is pressure greater than pressure switch label? See Note #2 Check PS hose, flue piping for obstruction and/or confirm vent size is correct See IFC Component Layout for location of plug. 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)? Check PS hose, flue piping for obstruction and/or confirm vent size is correct Replace pressure switch.. Replace or repair wiring harness.. Is voltage measured at inducer motor plug between pins 1 (BK) 2 (RD) 2 (RD) 3 (WH) 1 (BK) 3 (WH)? Replace IFC.. Replace Inducer.. UH2P-SF-1B 19

20 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. Replace filter and clean blower wheel. 4 Flash Fault LED Disconnect electrical power to furnace Are filter & blower wheel clean? See next page for additional 4 flash faults Check set screw position and motor bearings. Correct or replace as needed. Does blower wheel turn freely? Ignition occurs and FAN ON delay begins Cycle power to furnace and call for 1 st stage heat Note: Furnace will need to be checked in both 1 st & 2 nd stage operation. Does fan come on after ~45 seconds? Is 120 VAC measured at IFC between (Lo Heat and CIR-N) 1 st Stage (Hi-Heat and CIR-N) 2 nd stage? Check motor and capacitor. Repair or replace as needed Replace furnace control Down Flow Models Only Reverse flow switch checkout Is external static pressure greater than nameplate? Return air temperature is above max limit Correct application or duct issues. Correct gas pressure Is heat rise within specification? See Service Facts Is outlet manifold gas pressure within specifications? Is return air temperature above 85 F? Is temperature at high limit above the switch setting? Replace high limit switch Check for loose insulation or other objects within furnace air stream Make sure any temperature measuring devices (thermocouples, dial thermometers) used to estimate limit temperature are within ¼ inch of limit measurement point Does motor continue to run during the entire heating cycle? Is temperature at reverse flow switch above specifications? Check for excessive reverse flow during an off cycle Replace reverse flow switch 20 UH2P-SF-1B

21 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. 4 Flash Fault LED Is a Manual Reset, Flame Rollout Switch open? Install correct size orifices Is the burner orifice size 56? Or matched to Installers Guide for LP? Is LP gas being used? Disconnect electrical power to furnace Correct as needed Is flue piping restricted? 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 Are all burner flames directed into heat exchanger with a tight pattern? (inadequately aired burners tend to roll back) Check combustion air blower, venting, heat exchanger for blockage (i.e. sooting) Check burner alignment Correct as needed Ignition occurs Do all burners ignite within 5 seconds? Are flames from burners impinging on sides of heat exchanger? When fan comes on, do flames stay consistent? Replace heat exchanger Replace Roll out switch UH2P-SF-1B 21

22 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? Inspect gas supply for leaks and have gas supplier check gas quality Install drip leg per National Fuel Gas Code and Installation Instructions Is there a drip leg installed on inlet gas piping per installation instructions? Using a back-up wrench, install new gas valve 22 UH2P-SF-1B

23 DEFINITION: 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 UH2P-SF-1B 23

24 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? Correct wiring Replace IFC 24 UH2P-SF-1B

25 DEFINITION: The flame sense current is less than 1 micro-amp DC 8 Flash Fault LED Disconnect electrical power to the furnace Connect volt meter leads in series with flame sensor Meter must be set up for DC micro-amp scale Correct flame sensor location Is flame sensor located correctly? See figure Cycle power to furnace and call for heat Is flame current measured less than 1.0 micro-amp DC? Replace flame sensor Flame sensor is good. Check wiring and / or connections. Flame Sensor UH2P-SF-1B 25

26 Definition: This error is normally caused by improper installation or application of the furnace venting system. 9 Flash Fault LED Disconnect electrical power from the furnace and remove 1 wire from the limit switch. Inducer limit switch is open. Is continuity measured across inducer limit switch? Allow time for inducer limit to cool. Verify venting and vent terminations are within allowable lengths and clear of any obstructions. Verify venting and vent terminations are within allowable limits and clear any obstructions. Is Inducer Limit cool and contacts open? Replace Inducer Limit switch. 26 UH2P-SF-1B

27 Definition: Loss of communications between IFC and draft inducer motor. 10 Flash Fault LED Are wiring plugs firmly connected to the IFC board and Inducer motor? Check, repair wiring.. Replace IFC board. UH2P-SF-1B 27

28 PSC - No Air Flow Is there any air flow? Is the fan wheel running? Check for dirty air filter, duct work damage or restrictions around the air handler coil and repair as needed Is the high voltage power supplied to the unit? Repair high voltage connection to unit. Is the thermostat set to signal the fan to come on? Set the thermostat to signal the fan to come on. Is 24 VAC measured between R (transformer hot) and B/C (transformer common) at the low voltage field connections? Is the proper line voltage present at the transformer? Is fuse blown? Replace fuse. Repair wiring between incoming power supply and transformer. Replace transformer. Is 24 VAC measured between G and B/ C at the low voltage connections? Check thermostat and wiring to thermostat. Is 24 VAC measured at the fan relay coil. Check wiring between incoming low voltage connections and fan relay coil. Is line voltage measured across terminals 1 and 3 on fan relay contacts? (Zero volts indicates closed contacts.) Replace fan relay. Is line voltage measured between motor common and applied speed tap? Check line voltage to fan motor. Replace run capacitor. Trane 6200 Troup Highway Tyler, TX Is microfarad reading of fan motor run capacitor within 10% of rated value? Replace fan motor and run capacitor. For more information contact your local dealer (distributor) 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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