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Service Facts
Upflow/ Horizontal Left and Downflow/ Horizontal Right,
Gas-Fired, Direct/Non-Direct Vent, Variable Speed,
Modulating, Condensing, Communicating Furnaces
*UHMB060ACV3VB
*UHMB080ACV3VB
*UHMC100ACV4VB
*UHMD120ACV5VB
Note: * First letter may be "A" or "T"
This furnace can be configured for Communicating
or 24 VAC modes.
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating,
and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or
altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all pre-
cautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
March 2020
*DHMB060BCV3VB
*DHMB080ACV3VB
*DHMC100ACV4VB
*DHMD120BCV5VB
SAFETY WARNING
UHM-DHM-SF-1V-EN
Note: "Graphics in this document are for representation only.
Actual model may differ in appearance."
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Table of Contents
Related Manuals for American Standard UHMB060ACV3VB Series
Summary of Contents for American Standard UHMB060ACV3VB Series
- Page 1 Service Facts Upflow/ Horizontal Left and Downflow/ Horizontal Right, Gas-Fired, Direct/Non-Direct Vent, Variable Speed, Modulating, Condensing, Communicating Furnaces *UHMB060ACV3VB *DHMB060BCV3VB *UHMB080ACV3VB *DHMB080ACV3VB *UHMC100ACV4VB *DHMC100ACV4VB *UHMD120ACV5VB *DHMD120BCV5VB Note: * First letter may be “A” or “T" This furnace can be configured for Communicating or 24 VAC modes.
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Page 2: Product Specifications
Service Facts 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 ①... -
Page 3: Energy Efficient Operation
Service Facts PRODUCT SPECIFICATIONS ① MODEL ⑥ ⑥ ⑥ ⑥ *DHMC100ACV4VB *DHMD120BCV5VB *DHMB060BCV3VB *DHMB080ACV3VB TYPE Downflow / Horizontal Downflow / Horizontal Downflow / Horizontal Downflow / Horizontal RATINGS ② 40% (low) heat Input BTUH 40,000 48,000 24,000 32,000 40% (low) heat Capacity BTUH (ICS) ③ 39,000 47,000 23,000... -
Page 4: Safety Section
Service Facts SAFETY SECTION WARNING WARNING FIRE OR EXPLOSION HAZARD CARBON MONOXIDE POISONING HAZARD Failure to follow the safety warnings exactly could re- Failure to follow the steps outlined below for each sult in serious injury, death or property damage. appliance connected to the venting system being Never test for gas leaks with an open flame. -
Page 5: Furnace Components
Service Facts WARNING FIRE - EXPLOSION HAZARD DO NOT RUN FLEXIBLE GAS LINE THROUGH THE FURNACE CABINET WALL OR WITHIN THE FUR- NACE CABINET. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN PROPERTY DAMAGE, SERIOUS PERSONAL INJURY, OR DEATH. FURNACE COMPONENTS To Pressure Switch PS-1 ! Important ! -
Page 6: User Interface Display
Service Facts Service procedure to access the User In- terface for the Modulating Furnace This procedure must only be performed by trained ser- vice personnel. WARNING ELECTRICAL SHOCK HAZARD DO NOT BYPASS THE DOOR SWITCH BY ANY PER- MANENT MEANS. FAILURE TO FOLLOW WARNING COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH. -
Page 7: User Interface Menu
Service Facts USER INTERFACE MENU Power Up == WAIT == A/TCONT900 Variable Speed [ ] = Current Setting Standy Screen System Status Setup Options MODEL NUMBER CMFRT CNT MODE SERIAL NUMBER COMM [COMM] 24VAC * Unit specific COOLING CFM 2 COOLING CFM A/TUHMB060 3T [3T] 1.5T 2T 2.5T... - Page 8 Service Facts 24V Variable Speed [ ] = Current Setting System Status Setup Options CMFRT CNT MODE COMM [24VAC] 24VAC * Unit specific A/TUHMB060 3T [3T] 1.5T 2T 2.5T COOLING CFM 2 COOLING CFM A/TUHMB080 3T [3T] 3.5T 2T 2.5T A/TUHMC100 4T [4T] 2.5T 3T 3.5T A/TUHMD120...
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Page 9: Sequence Of Operation
Service Facts SEQUENCE OF OPERATION SEQUENCE OF OPERATION – COMMUNICATING MODE 1. This furnace is fully modulating between 40% and 100% of capacity in 1% increments. The furnace always lights at approximately 65% and will modulate up or down; depending on the communicating com- fort control demand. - Page 10 Service Facts Note: of the vent motor speed in steps allows the gas flow Pressure Switch 1 closes at approximately 40% of through the gas valve to also be reduced in steps, capacity. decreasing the chance of burner flame out. The mini- Pressure Switch 2 closes at approximately 65% of mum capacity change is 1%.
- Page 11 Service Facts 13. If the call for W2 remains, this 3% increase will be 24. After 45 seconds, the IFC signals the indoor blower repeated every 1 minute until the capacity requested motor to run at the programmed ignition sequence is 100%.
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Page 12: Gas Valve Setup (Manifold Pressure Adjustment)
Service Facts UNIT TEST MODE B) GAS VALVE SETUP (MANIFOLD PRESSURE ADJUSTMENT) A) SIMPLE NOTE: To obtain an accurate manifold pressure Note: measurement ,the manifold pressure must be refer- Stage 1 = 40% (low) heat, Stage 2 = 100% (high) heat enced to the burner box, since the burner box pres- sure tap equalizes the gas valve pressure regulator. -
Page 13: Explosion Hazard
Service Facts CORRECT METHOD OF CHECKING DIRECT VENT MANIFOLD PRESSURE WITH BURNER BOX REFERENCED WARNING EXPLOSION HAZARD REPLACE AND/OR TIGHTEN ALL PLUGS REMOVED OR LOOS- ENED WHEN ADJUSTING GAS PRESSURE. LEAK Slope Gauge CHECK THE FITTINGS BEFORE PLACING INTO REGULAR SERVICE. FAILURE TO FOLLOW THIS WARNING COULD Connects to... -
Page 14: Personality Module
Service Facts Use Manifold Pressure Settings Table 1 for the cor- h. Allow 5 minutes to pass before attempting to adjust rect manifold pressure setting in Inches of Water the 40% manifold pressure. This will insure that the Column. learning routine is complete and that the heat rise is stable. -
Page 15: Stand-Alone Operation
Service Facts STAND ALONE OPERATION • Are you Sure and NO [NO] will now be displayed. With a NO/ NO question being asked, use the or (CONTINGENCY MODE) arrows to select the YES and then press the ENTER The Contingency Mode allows the installer to set the button. - Page 16 Service Facts IFC INDUCER LEARNING ROUTINE SEQUENCE operation begins. The forty-five second time delay allows the heat exchanger and the recuperative Note: cell to warm up. Stage 1 = 40% (low) heat, Stage 2 = 100% (high) heat • The furnace IFC will now start its 65% (medium) •...
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Page 17: Periodic Servicing Requirements
Service Facts INDOOR BLOWER TIMING PS-3 Inducer Learning Routine Heating: The Integrated Furnace Control module Note: controls the Indoor Blower. The Blower Stage 1 = 40% (low) heat, Stage 2 = 100% (high) heat start is fixed at 45 seconds after ignition. •... - Page 18 Service Facts 3. BLOWERS – The Blower size and speed determine c. Remove burner compartment door from Furnace. the air volume delivered by the Furnace. The Blower d. Inspect around insulation covering flue collector motor bearings are factory lubricated and under box.
- Page 19 Service Facts *UHM WIRING DIAGRAM CAUTION Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. UHM-DHM-SF-1V-EN...
- Page 20 Service Facts *UHM SCHEMATIC DIAGRAM CAUTION Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. UHM-DHM-SF-1V-EN...
- Page 21 Service Facts *DHM WIRING DIAGRAM CAUTION Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. UHM-DHM-SF-1V-EN...
- Page 22 Service Facts *DHM SCHEMATIC DIAGRAM CAUTION Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. UHM-DHM-SF-1V-EN...
- Page 23 Service Facts *UHM AIRFLOW - HEATING *UHMB060ACV3VB^ Furnace Heating Airflow (CFM) and Power (watts) vs. External Static Pressure With Filter Airflow Target Airflow External Static Pressure Setting (See Note 5) Temp. Rise Watts Temp. Rise Medium Low Watts (low) Heat Medium** Temp.
- Page 24 Service Facts *UHM AIRFLOW - HEATING *UHMC100ACV4VB^ Furnace Heating Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Airflow Target Airflow External Static Pressure Setting (See Note 5) Temp. Rise Watts Medium Low Temp. Rise Watts (low) Heat Medium** Temp.
- Page 25 Service Facts *UHM AIRFLOW - COOLING *UHMB060ACV3VB^ Furnace Cooling Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Unit Airflow External Static Pressure Outdoor Setting 290 CFM/ton Watts 310 CFM/ton Watts 330 CFM/ton Watts 350 CFM/ton Watts 370 CFM/ton Watts 400 CFM/ton Watts...
- Page 26 Service Facts *UHM AIRFLOW - COOLING *UHMB080ACV3VB^ Furnace Cooling Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Unit Airflow External Static Pressure Outdoor Setting 290 CFM/ton Watts 310 CFM/ton Watts 330 CFM/ton Watts 350 CFM/ton Watts 370 CFM/ton Watts 400 CFM/ton Watts...
- Page 27 Service Facts *UHM AIRFLOW - COOLING *UHMC100ACV4VB^ Furnace Cooling Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Unit Airflow External Static Pressure Outdoor Setting 290 CFM/ton Watts 310 CFM/ton Watts 330 CFM/ton Watts 350 CFM/ton Watts 370 CFM/ton Watts 1009 1009...
- Page 28 Service Facts *UHM AIRFLOW - COOLING *UHMD120ACV5VB^ Furnace Cooling Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Unit Airflow External Static Pressure Outdoor Setting 1000 1024 1028 1022 1011 290 CFM/ton Watts 1072 1094 1097 1089 1076 310 CFM/ton Watts 1143...
- Page 29 Service Facts *DHM AIRFLOW - HEATING *DHMB060BCV3VB^ Furnace Heating Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Target Airflow External Static Pressure Airflow Setting (See Note 5) Temp. Rise Watts Medium Low Temp. Rise Watts 40% (low) Heat Medium** Temp.
- Page 30 Service Facts *DHM AIRFLOW - HEATING *DHMC100ACV4VB^ Furnace Heating Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter External Static Pressure Airflow Target Airflow Setting (See Note 5) Temp. Rise Watts Medium Low Temp. Rise Watts (low) Heat Medium** Temp.
- Page 31 Service Facts *DHM AIRFLOW - COOLING *DHMB060BCV3VB^ Furnace Cooling Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Unit Outdoor External Static Pressure Airflow Setting Size (tons) 290 CFM/ton Watts 310 CFM/ton Watts 330 CFM/ton Watts 350 CFM/ton Watts 370 CFM/ton Watts...
- Page 32 Service Facts *DHM AIRFLOW - COOLING *DHMB080ACV3VB^ Furnace Cooling Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Unit Airflow External Static Pressure Outdoor Setting 290 CFM/ton Watts 310 CFM/ton Watts 330 CFM/ton Watts 350 CFM/ton Watts 370 CFM/ton Watts 400 CFM/ton Watts...
- Page 33 Service Facts *DHM AIRFLOW - COOLING *DHMC100ACV4VB^ Furnace Cooling Airflow (CFM) and Power (Watts) vs. External Static Pressure With Filter Unit Airflow External Static Pressure Outdoor Setting 290 CFM/ton Watts 310 CFM/ton Watts 330 CFM/ton Watts 350 CFM/ton Watts 370 CFM/ton Watts 400 CFM/ton Watts...
- Page 34 Service Facts *DHM AIRFLOW - COOLING *DHMD120BCV5VB^ Furnace Cooling Airflow (CFM) & Power (Watts) vs. External Static Pressure w/Filter Unit Outdoor Size External Static Pressure Airflow Setting (tons) 1046 1103 1032 1027 1022 290 CFM/ton Watts 1111 1172 1102 1099 1095 310 CFM/ton Watts...
- Page 35 Service Facts Alert Codes REVISION: 9 CN: 9108T00 DATE: 2009-6-12 sorted by Alert Notification Alert Alert Group Alert Description Code Fault LED COM LED User Interface Display Control Display furnace Flash Flame is off when flame should be Codes RECYCLE detected.
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Page 36: Alert Code Recovery
Service Facts ALERT CODE RECOVERY DESCRIPTION FUNCTION On power up, last 4 Alerts, if any, will be flashed on the Red Alert LED. The newest Alert detected will flash first FAST FLASH - CALL and the oldest last. There will be a 2 second delay be- tween Alert Code flashes. - Page 37 IFC Error Flash Codes Service Facts Troubleshooting Flowchart Index 37) IFC Component Layout 38) LED Flash Codes 39) Getting started 40) 2 Flash Troubleshooting Retry and Recycle Lockout 42) 3 Flash Troubleshooting Pressure Switch Errors 43) 4 Flash Troubleshooting High Limit and Auxiliary Limit 44) 4 Flash Troubleshooting Roll Out Limit 45) 5 Flash Troubleshooting Flame Error 46) 6 Flash Troubleshooting Polarity and Ground Errors...
- Page 38 Service Facts UHM-DHM-SF-1V-EN...
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Page 39: Solid Red
Service Facts LED Flash Codes RED LED FLASH ERROR External Lockout (3 Retries or 11 Recycles Exceeded) Pressure Switch or Inducer Error Open High, Auxiliary, or Roll-out Limit Switch Flame Sensed When No Flame Should Be Present Earth Ground Not Detected or Poor, Reversed Polarity, Igniter or Triac Error External Gas Valve Circuit Error (Voltage present when it should not be) Low Flame Sensor (Less than 1 dc micro-amp) Open Inducer Limit... - Page 40 Service Facts UHM-DHM-SF-1V-EN...
- Page 41 Service Facts DEFINITION 2 Flash Fault LED RETRY LO = 3 unsuccessful tries for ignition within a single call for heat Flame has never been sensed RECYCLE LO = 10 recycles within a single Scroll through call for heat. User Interface to View number 1 of Flame is sensed &...
- Page 42 Service Facts Correct positioning of ignitor and flame sensor. NOTE the slight over lap of the ignitor and the burner. Correct positioning of igniter. HOT ZONE must be centered over the cross-over. Igniter must overlap burner. UHM-DHM-SF-1V-EN...
- Page 43 Service Facts Each time power is interrupted to the furnace (ie. door DEFINITION switch), the furnace will go through an inducer learning routine to determine the most efficient speed to close An error has occurred with either PS1, PS2, or PS3. the pressure switches The error will be reported, indicating that a pressure switch is either opened or closed, contrary to normal...
- Page 44 Service Facts DEFINITION: See next page for 4 Flash Fault LED additional 4 flash Limit switches are safety faults devices that will open when an abnormal high temperature has been Scroll through sensed. User Interface to REMOVE ALL JUMPER User Interface User Interface View number 1 of WIRING TO SWITCHES!
- Page 45 Service Facts DEFINITION: 4 Flash Fault LED Limit switches are safety devices that will open when an abnormal high temperature has been sensed. Scroll through REMOVE ALL JUMPER User Interface to WIRING TO SWITCHES! View number 1 of Under no circumstances, shall Last 4 Faults these switches be left jumpered when not...
- Page 46 Service Facts 5 Flash Fault LED DEFINITION: Flame is sensed when it should not be sensed. Scroll through User Interface to View number 1 of Last 4 Faults User Interface shows a FLAME ERROR? Disconnect electrical power to furnace Turn off gas supply! Remove gas valve Are there signs of...
- Page 47 Service Facts 6 Flash Fault LED DEFINITION: GND ERR - Incoming or chassis ground connection is not sensed POLARITY ERR – Incoming high voltage wiring is reversed Scroll through See next page for User Interface to additional 6 flash View number 1 of faults Last 4 Faults User Interface...
- Page 48 Service Facts DEFINITION: TRIAC ERR – The triac reduces voltage applied to the ignitor. A voltage error has 6 Flash Fault LED been sensed IGNITOR ERR – The control board has sensed that the ignitor circuit is open or Damaged Triac shorted.
- Page 49 Service Facts 7 Flash Fault LED DEFINITION: External Gas Valve Circuit Error (24 volts is present when it should not be present) Scroll through User Interface to View number 1 of Last 4 Faults User Interface shows EXT GV ERR? Turn Comfort Control to “OFF”...
- Page 50 Service Facts 8 Flash Fault LED DEFINITION: The flame sense current is less than 1 micro-amp dc Scroll through User Interface to View number 1 of Last 4 Faults User Interface shows LO FLAME SNS? Disconnect electrical power to the furnace Connect volt meter Meter must be set on leads in series with...
- Page 51 Service Facts 9 Flash Fault LED DEFINITION: This error is normally caused by improper installation or application of the venting system. Scroll through User Interface to View number 1 of Last 4 Faults User Interface shows IND LIMIT? Does User Refer to 4 Flash Interface show High Fault section...
- Page 52 Service Facts UHM-DHM-SF-1V-EN...
- Page 53 Service Facts 10 Flash Fault LED Scroll through User Interface to View number 1 of Last 4 Faults User Interface User Interface shows 24V shows NO SYS COMM CLK? MSMTCH? ERR 139 appears on the Comfort Control After ~10 Replace IFC seconds;...
- Page 54 About Trane and American Standard Heating and Air Conditioning Trane and American Standard create comfortable, energy efficient indoor environments for residential applications. For more information, please visit www.trane.com or www.americanstandardair.com This product may be covered by one or more of the following patents and their foreign equivalents: 5621888, 5901156, 6208263, 6353376, and 6448901.