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Installer's Guide
Upflow/ H orizontal and Downflow/ Horizontal,
Gas-Fired, Direct Vent, Variable Speed Inducer, Modulating
Condensing Communicating furnaces
*UHMB060ACV3VB
*UHMB080ACV3VB
*UHMC100ACV4VB
*UHMD120ACV5VB
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT — This Document is customer property and is to remain with this unit.
NOTE:
This furnace can be configured for Communicating or 24 VAC modes. Using fully Communicating or 24 VAC
modes, the furnace can support single or multi-stage heat pump, AC, or heating only applications. Combined with
a communicating Comfort Control only, the furnace will support a single stage 24 VAC cooling outdoor unit only.
1. Safety signal words are used to designate a degree or level of seriousness associated with a particular hazard.
2. The signal words for safety markings are WARNING, and CAUTION.
3. a. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
4. b. CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It
is also used to alert against unsafe practices and hazards involving only property damage.
Please return to service information pack upon completion of work.
*UHM
UPFLOW
UPFLOW/HORIZONTAL
*DHMB060BCV3VB
*DHMB080ACV3VB
*DHMC100ACV4VB
*DHMD120BCV5VB
*DHM
DOWNFLOW/HORIZONTAL
18-CD30D1-20-EN
* First letter may be "A" or "T"
DOWNFLOW
A341624P14
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Table of Contents
Related Manuals for American Standard UHMB080ACV3VB Series
Summary of Contents for American Standard UHMB080ACV3VB Series
- Page 1 18-CD30D1-20-EN Installer’s Guide Upflow/ H orizontal and Downflow/ Horizontal, Gas-Fired, Direct Vent, Variable Speed Inducer, Modulating Condensing Communicating furnaces *UHMB060ACV3VB *DHMB060BCV3VB * First letter may be “A” or “T" *UHMB080ACV3VB *DHMB080ACV3VB *UHMC100ACV4VB *DHMC100ACV4VB *UHMD120ACV5VB *DHMD120BCV5VB ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack upon completion of work. NOTE: This furnace can be configured for Communicating or 24 VAC modes.
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Page 2: Safety Section
Installer’s Guide SAFETY SECTION WARNING WARNING Failure to follow safety warnings exactly, could result CARBON MONOXIDE POISONING HAZARD in a fire or explosion causing property damage, Failure to follow the steps outlined below for each personal injury or loss of life. appliance connected to the venting system being placed into operation could result in carbon monoxide —... -
Page 3: Table Of Contents
Installer’s Guide Contents WARNING EXPLOSION HAZARD! NEVER USE AN OPEN FLAME TO DETECT GAS LEAKS. EXPLO- Safety Section ..............2 SIVE CONDITIONS MAY OCCUR. USE A LEAK TEST SOLUTION Outline Drawing ..............4 OR OTHER APPROVED METHODS FOR LEAK TESTING. FAILURE Locations and Clearances ............ 6 TO FOLLOW THIS WARNING COULD RESULT IN PROPERTY General Installation Instructions ........... 6 Upflow Installation ..............7 DAMAGE, PERSONAL INJURY OR DEATH. Downflow Installations ............7 Horizontal Installation ............7 Air for Combustion and Ventilation ........ -
Page 4: Outline Drawing
Installer’s Guide 18-CD30D1-20-EN... - Page 5 Installer’s Guide 18-CD30D1-20-EN...
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Page 6: Locations And Clearances
Installer’s Guide 7. When a furnace is installed so that supply ducts carry 4. Are there at least 3 inches of clearance between the air circulated by the furnace to areas outside the space furnace combustion air openings in the front panel containing the furnace, the return air shall also be and any closed panel or door provided? handled by a duct(s) sealed to the furnace casing and... -
Page 7: Upflow Installation
Installer’s Guide ② WARNING SAFETY HAZARD DO NOT INSTALL THE FURNACE DIRECTLY ON CARPETING, TILE OR OTHER COMBUSTIBLE MATERIAL OTHER THAN WOOD FLOORING. FOR VERTICAL DOWNFLOW APPLICATIONS, SUBBASE (BAYBASE205) MUST BE USED BETWEEN THE FURNACE AND COMBUSTIBLE FLOORING. WHEN THE DOWNFLOW FURNACE IS INSTALLED VERTICALLY WITH A CASED COIL, A SUBBASE IS NOT REQUIRED. FAILURE TO FOLLOW THE WARNING EXACTLY COULD RESULT IN SERIOUS ③ PERSONAL INJURY, PROPERTY DAMAGE OR DEATH. A (width) UPFLOW INSTALLATION B (depth) Standoffs and screws (See Figure 1) are included with FURNACE FRONT the cased coils for attachment to the furnace. NOTE: The top flanges on the furnace must be bent 90 degrees upward to allow the coil attachment. -
Page 8: Air For Combustion And Ventilation
Installer’s Guide OUTSIDE AIR IS RECOMMENDED ⑤ The use of indoor air for most applications is acceptable, unless there is the presence of corrosive chemicals or contamination. Certain types of installation will require the use of outside air for combustion. The following types of installations will require use of OUTDOOR AIR for combustion, due to chemical UPFLOW/ exposures:... -
Page 9: Duct Connections
Installer’s Guide ⑧ ⑦ CONFINED SPACE Confined spaces are installations with less than 50 cu. ft. of space per 1000 BTU/hr input from all equipment installed. Air for combustion and ventilation requirements can be supplied from inside the building as in Figure 8 or from the outdoors, as in Figure 9. - Page 10 Installer’s Guide With a parallel flow arrangement, the dampers or other 1. Determine the appropriate position to set the furnace means used to control flow of air shall be adequate in order to connect to existing supply and return to prevent chilled air from entering the furnace, and if ductwork.
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Page 11: Return Air Filters
Installer’s Guide reinstall the two 5/16” screws. ⑪ 8. The horizontal installation of the upflow furnace requires an external filter section. Do NOT use the bottom return filter within the furnace. Filter kits are available for horizontal applications. 9. Connect duct work to furnace. See Outline Drawing for supply and return duct size and location. - Page 12 Installer’s Guide a. Remove the filter. ⑮ BOTTOM ENGAGEMENT b. Remove the bottom panel. Filter Rack c. Pre-drill two engagement holes with 3/16" drill at Retaining dimple locations. See Figure 13. Furnace Screw/Pin Filter Cabinet d. With the filter removed, the filter rack is Rack Side compressed and then inserted into the bottom...
- Page 13 Installer’s Guide installed in the duct work upstream of the furnace. See ⑱ Figure 20. Conversion kits for horizontal filter installation Furnace are shown in Table 4A. Engagement Hole BLOWER Blower Filter Rack Conversion kits for horizontal filters are BAYFLTR203 DECK Installation With Deck...
- Page 14 Installer’s Guide furnace cabinet. Typical installations are shown in Figure MODELS CABINET FILTER 22. Tables 6 and 7 provide information for installation NUMBERS WIDTH QTY & SIZE *DHMB060BCV3VB of the filter retaining brackets shipped with downflow 17-1/2" 2 - 14" X 20" X 1" *DHMB080ACV3VB furnaces.
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Page 15: General Venting Information
Installer’s Guide GENERAL VENTING INFORMATION WARNING THIS FURNACE MUST BE VENTED TO THE OUTDOORS. THESE FURNACES ARE INDUCED CARBON MONOXIDE POISONING HAZARD DRAFT VENTED AND MUST NOT BE CONNECTED TO Failure to follow the steps outlined below for each ANY VENT SERVING ANOTHER APPLIANCE. PLEASE appliance connected to the venting system being NOTE THAT THESE FURNACES USE POSITIVE- placed into operation could result in carbon monoxide... - Page 16 Installer’s Guide be vented to the exterior of the house, but combustion 2" TO 3" COUPLING air may enter from the surrounding area as long as combustion air requirements are met. (See AIR FOR #CPL00938 COMBUSTION AND VENTILATION). FURNACE VENT / INLET PIPE INSTALLATION IN TWO FACTORY SUPPLIED ONLY PRESSURE ZONE CONFIGURATIONS WITH THE FOLLOWING MODELS:...
- Page 17 Installer’s Guide Example 2 shows the vent pipe exhausting through the NOTE: roof and the inlet air coming from the interior of the house If only the flue gas pipe is to the outside of the structure, a straight section of pipe (long enough to (See Note).
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Page 18: Venting Materials
Installer’s Guide APPROVED VENT PIPE MATERIALS TABLE 9 PVC VENT FITTING MATERIAL These fittings are available from your Gas furnace Distributors for U.S. applications only. PLASTIC VENT PIPE DESIGNATIONS ASTM STANDARD PIPE TYPE ALLOWABLE TEMPERATURE °F MARKING 1 158 F891 CELLULAR CORE ASTM F891 D2665 DWV PIPE 2 158 ASTM D2665 2 158... -
Page 19: Vent Length Table
Installer’s Guide MAXIMUM VENT LENGHT TABLE TABLE 10 VENT LENGTH TABLE - MODULATING FURNACE MAXIMUM TOTAL EQUIVALENT LENGTH IN FEET FOR VENT AND INLET ALTITUDE AIR (SEE NOTES) 2 INCH PIPE 2.5 INCH PIPE 3 or 4 INCH PIPE 0-7000 Feet NATURAL GAS PROPANE NATURAL GAS PROPANE NATURAL GAS... -
Page 20: Venting Through The Roof
Installer’s Guide HORIZONTAL VENTING Connection of the pipe and collar of the combustion air inlet should just be a friction fit. It is recommended that NOTE: the inlet air joint be sealed with RTV type sealant to Vent termination kit BAYAIR30AVENTA or allow the joint to be separated for possible future service. -
Page 21: Horizontal Venting Through The Wall
Installer’s Guide chimney venting option. When wall venting is used HORIZONTAL VENTING THROUGH WALL on any surface that can be affected by this moisture, it IMPORTANT: is recommended that a corrosion resistant shield (24 The building owner/maintenance provider must keep the area inches square) be used behind the Vent Terminal. This around the vent clear from snow. - Page 22 Installer’s Guide 3. SIGNAGE. A metal or plastic identification plate shall be IMPORTANT: permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for installation of with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment.
- Page 23 Installer’s Guide ANCHORS (4 req.) 12" MIN TO OVERHANG VENT PLATE VENT 1" + " 3.2" 12" MINIMUM TO OVERHANG COMBUSTION COMBUSTION SCREWS (4 req.) VENT VENT MAINTAIN 12 IN. VENT MINIMUM CLEARANCE ABOVE HIGHEST MAINTAIN 12" MINIMUM CLEARANCE ANTICIPATED SHOW ABOVE HIGHEST ANTICIPATED SNOW LEVEL LEVEL OR GRADE OR GRADE WHICHEVER IS GREATER...
- Page 24 Installer’s Guide Table 11 Non-Direct Vent Terminal Clearances Canadian Installations US Installations Clearance above grade, veranda, porch, deck, 12 inches (30 cm) 12 inches (30 cm) or balcony 6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12 inches (30 cm) for appliances > 10,000 Btuh (3 kw) 4 feet (1.2m) below or to the side of opening;...
- Page 25 Installer’s Guide NOTE: VENT AND INLET MUST BE SUPPORTED AT A MAXIMUM OF 3' INTERVALS STRAPS OR OTHER SUITABLE SUPPORTS BAYAIR30AVENTA AT A MAXIMUM OF 3' 0" INTERVALS COMBUSTION STRAP (FIELD SUPPLIED) RAIN CAP VENT VENT 1" + 1/2" ELBOW COMBUSTION AIR (FIELD SUPPLIED)
- Page 26 Installer’s Guide SUPPORT HORIZONTAL PIPE EVER Y 3' 0" WITH THE FIRST SUPPORT AS CLOSE TO THE FURNACE AS POSSIBLE. IN-DUCED DRAFT BLOWER, HOUSING, AND FURNACE MUST NOT SUPPORT THE WEIGHT OF THE FLUE PIPE. VENT 12 INCHES MIN. CLEARANCE MUST BE MAINTAINED ABOVE HIGHEST ANTICIPATED SNOW LEVEL.
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Page 27: Venting Routed Through A Masonry Chimney
Installer’s Guide PVC PLASTIC VENTING TYPE 29-4C STAINLESS STEEL VENTING THROUGH UNUSED CHIMNEY THROUGH UNUSED CHIMNEY IMPORTANT – IMPORTANT – Refer to Section 12.6.8 of NFPA 54 / ANSI 223.1 2012 Refer to Section 12.6.8 of NFPA 54 / ANSI 223.1 2012 when routing vent piping through a chimney. when routing vent piping through a chimney. STAINLESS STEEL STAINLESS... -
Page 28: Electrical Connections
Installer’s Guide ELECTRICAL CONNECTIONS WHOLE HOUSE AIR CLEANER CONNECTION CAUTION NOTE: Protect from Property Damage The B/C terminal will require three wires to be con- Do NOT connect the furnace line voltage to a GFCI protected nected to the low voltage terminal strip. To make this circuit. Failure to follow this warning could result in property easier, create a pigtail using a short length of thermo- damage. - Page 29 Installer’s Guide 41B - Communicating Indoor Unit with Communicating Comfort Control and 24VAC Single Stage Cooling 41C - 24 VAC Mode Indoor Unit with 24 VAC Comfort Control and 24VAC Single Stage Cooling 18-CD30D1-20-EN...
- Page 30 Installer’s Guide Field Wiring Diagrams continued 41D - 24 VAC Mode Indoor Unit with 24 VAC Comfort Control and 24VAC 2-Stage or 2-Step Cooling 41E - 24 VAC Mode Indoor Unit with 24 VAC Comfort Control and 24VAC Single Stage Heat Pump 18-CD30D1-20-EN...
- Page 31 Installer’s Guide 41F - 24 VAC Mode Indoor Unit with 24 VAC Comfort Control and 24VAC 2-Stage or 2-Step Heat Pump 41G - Humidistat Hookup - 24 V Mode ONLY BK Jumper The factory installed jumper between "R" and "BK" on the circuit board must be cut if an op- tional humidistat is installed. HUMIDISTAT HOOKUP - 24 V ONLY controller is connected to *CONT402 is installed and using the BK enabled feature. If an optional humidistat for humidity control in cooling is used, the factory installed "BK Jumper" must be cut. See the 24VAC field wiring diagrams for more information.
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Page 32: Condensate Drain Instructions
Installer’s Guide CONDENSATE DRAIN INSTRUCTIONS VERTICAL APPLICATIONS Upflow Vertical furnace - The connection tubing for left and CAUTION right side drainage is shipped in the blower compartment. It is recommended that an external overflow drain pan be installed Install the connection tubing from the trap to the side of under the furnace to prevent property damage or personal injury the unit and trim all excess tubing to avoid kinks. - Page 33 Installer’s Guide Downflow Vertical furnace - Downflow furnace - Use RTV sili- The furnace trap must be repositioned to the exterior con sealant to connect the fitting to the trap for ease of of the cabinet. Remove the trap from its present loca- removal when cleaning the trap. tion and reposition the trap outside of the unit, through For left side drain a 1/2"...
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Page 34: Gas Piping
Installer’s Guide GAS PIPING WARNING FIRE - EXPLOSION HAZARD DO NOT RUN FLEXIBLE GAS LINE THROUGH THE FURNACE CABINET WALL OR WITHIN THE FURNACE CABINET. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN PROPERTY DAMAGE, SERIOUS PERSONAL INJURY, OR DEATH. CAUTION Use a backup wrench on the Gas Valve when installing Gas Piping to prevent damage to the Gas Valve and Manifold Assembly. The upflow/ horizontal furnace is shipped standard for left side installation of Gas Piping. A cutout is provided on the right side for an alternate Gas Piping arrangement. Cut off curved end of ... - Page 35 Installer’s Guide AUTOMATIC GAS VALVE WITH AUTOMATIC GAS VALVE WITH IMPORTANT: MANUAL SHUT-OFF MANUAL SHUT-OFF A sediment trap must be installed in the gas line before the 1/8” NPT 1/8” NPT Test Fitting Test Fitting furnace gas valve. The Main Manual Main Manual Shut-o Valve sediment trap must Shut-o Valve Ground be located as close to Union Ground Joint Union the furnace cabinet as Joint DRIP DRIP practical. Drip Leg Drip Leg UPFLOW MAY BE LEFT OR RIGHT HAND GAS PIPING IMPORTANT:...
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Page 36: Combustion And Input Check
Installer’s Guide HIGH ALTITUDE DERATE nace. 2. Clock the Gas Meter with the furnace operating on CAUTION high heat for one revolution. Table 18 shows the flow CAUTION rate in cubic feet per hour for a measured time of Maintain manifold pressure as specified in Table 15 in high one revolution for a meter on which one revolution altitude installations. Failure to do so may result in poor ignition ... - Page 37 Installer’s Guide If the desired input rate cannot be achieved with a TABLE 18 change in manifold pressure, then the orifices must be GAS FLOW IN CUBIC FEET PER HOUR changed. See Table 16 for replacement orifice part num- 2 CUBIC FOOT DIAL bers. SEC. FLOW SEC. FLOW SEC. FLOW SEC. FLOW LP installations will require an orifice and gas valve change.
- Page 38 Installer’s Guide To Pressure Switch PS-1 ! Important ! Brass orifices located in these two legs. H-Fitting must be installed in this orientation. VACUUM HOSE Burner Box ROUTING Pressure Switch PS-1 Orifice in H fitting must be pointing away from PS1 H-Fitting Pressure Switch PS-3...
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Page 39: Start-Up And Adjustment
Installer’s Guide gas that might have escaped to dissipate. LP Gas being REINSTALLATION OF THE BURNER BOX COVER heavier than air may require forced ventilation. Turn the Figure 55 shows the correct way to reinstall the Burner toggle switch on the Gas Valve in the unit to the “ON” Box cover if adjustment or replacement of the Flame position. -
Page 40: User Interface Menu
Installer’s Guide USER INTERFACE MENU 2. Lower door panel and remove from service access area. 3. Use one hand depress the door switch (there must be power to the control system for the display assembly to SERVICE PROCEDURE TO ACCESS function) and keep the door switch depressed during USER INTERFACE FOR THE MODULATING FURNACE programming. - Page 41 Installer’s Guide TABLE 20 - USER INTERFACE MENU Power Up == WAIT == A/TCONT900 Variable Speed Standy Screen System Status Setup Options [ ] = Current Setting 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 A/TUHMB080...
- Page 42 Installer’s Guide TABLE 20 - USER INTERFACE MENU - 24VOLT MENU (CONTINUED) 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 43: Sequence Of Operation
Installer’s Guide SEQUENCE OF OPERATION reduction of the vent motor speed in steps allows the gas flow through the gas valve to also be reduced SEQUENCE OF OPERATION – COMMUNICATING in steps, decreasing the chance of burner flame out. MODE The minimum capacity change is 1%. 1. - Page 44 Installer’s Guide Thermostat call for W2 after W1 SEQUENCE OF OPERATION – 24VAC Mode 1. This furnace modulates between 40% and 100% of 12. R and W2 thermostat contacts close signaling a call capacity, in 3% increments, every 1 minute. The for W2 heat. The IFC then signals the variable speed furnace always lights at approximately 65% and inducer drive to ramp up the vent motor allowing flow will modulate up or down;...
- Page 45 Installer’s Guide the furnace three times to try and verify a flame. If no flame is detected, the IFC will lockout for one hour. The IFC will send an alert code to the communicating comfort control (ERR 22) and User Interface (RETRY LO) as well as flash its Red alert LED two times repeatedly.
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Page 46: Unit Test Mode
Installer’s Guide UNIT TEST MODE B) GAS VALVE SETUP (MANIFOLD PRESSURE ADJUSTMENT) A) SIMPLE NOTE: To obtain an accurate manifold pressure mea- surement ,the manifold pressure must be referenced Note: to the burner box, since the burner box pressure tap Stage 1 = 40% (low) heat, Stage 2 = 100% (high) heat equalizes the gas valve pressure regulator. - Page 47 Installer’s Guide CORRECT METHOD OF CHECKING DIRECT VENT MANIFOLD PRESSURE WITH BURNER BOX REFERENCED WARNING EXPLOSION HAZARD REPLACE AND/OR TIGHTEN ALL PLUGS REMOVED OR LOOSENED WHEN ADJUSTING GAS PRESSURE. LEAK CHECK THE FITTINGS BEFORE PLACING INTO REGULAR SERVICE. FAILURE TO FOLLOW Slope THIS WARNING COULD RESULT Gauge IN SERIOUS PERSONAL INJURY, PROPERTY DAMAGE, OR DEATH Connects to Burner Box Pressure Hose Manifold Pressure Field Supplied Measurement Fitting A Field Supplied barb fitting must be used on the gas valve to attach the hose Low Heat Manifold TABLE 21 Pressure FINAL NG MANIFOLD PRESSURE SETTINGS (inches (Adjustment under furnace Input rate w.c.) Negative Control cover) (KBTU/hr) Pressure Post 100% Positive Control Pressure Post 0.7 + 0.2 / - 0.0 Not Adjustable...
- Page 48 Installer’s Guide l. Use Manifold Pressure Settings Table 22 for the correct the 40% manifold pressure. This will insure that the manifold pressure setting in Inches of Water Column. learning routine is complete and that the heat rise is stable. m.
- Page 49 Installer’s Guide TABLE 22 STAND ALONE OPERATION (CONTINGENCY MODE) The Contingency Mode allows the installer to set the furnace FINAL NG MANIFOLD PRESSURE SETTINGS (inches w.c.) equipment to operate in an ON/ OFF Duty Cycle mode. Input rate This mode will be activated using the User Interface. 100% (KBTU/hr) Contingency Mode is NOT available in 24VAC mode. 0.7 + 0.2 / - 0.0 Not Adjustable 3.5 ±...
- Page 50 Installer’s Guide the YES and then press the ENTER button. IFC INDUCER LEARNING ROUTINE SEQUENCE • Are you Sure and NO [NO] will now be displayed. With a NO/ • The furnace IFC will go through an inducer learning routine NO question being asked, use the or arrows to select for three pressure switches.
- Page 51 Installer’s Guide PS-3 INDUCER LEARNING ROUTINE NOTE: The furnace lights at approximately 65% of capacity. • When the furnace IFC receives a digital signal for 100% • When the burner flame is detected by the furnace IFC, a (high) heat from the comfort control it will begin the forty-five second time delay for indoor blower operation PS-3 inducer learning routine.
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Page 52: Control And Safety Switch Adjustments
Installer’s Guide CONTROL AND SAFETY SWITCH WARNING ADJUSTMENTS ELECTRICAL SHOCK HAZARD LIMIT SWITCH CHECK OUT DISCONNECT POWER TO THE UNIT BEFORE REMOVING THE The Limit Switch is a safety device designed to close the BLOWER DOOR. ALLOW A MINIMUM OF 10 SECONDS FOR IFC Gas Valve should the furnace become overheated. Since POWER SUPPLY TO DISCHARGE TO 0 VOLTS. -
Page 53: Conditions Effecting Furnace Operation
Installer’s Guide CONDITIONS AFFECTING FURNACE 3. POWER FAILURE If there is a power failure during a Heating Cycle, the OPERATION system will restart the Ignition Sequence automatically NOTE: when power is restored, if the Comfort Control still calls CONTINUOUS fan mode during COOLING operation may not be ap- for heat. propriate in humid climates. If the indoor air exceeds 60% relative humidity or simply feels uncomfortably humid, it is recommended ... -
Page 54: Alert Code Recovery
Installer’s Guide ALERT CODE RECOVERY Table 23 On power up, last 4 Alerts, if any, will be flashed on the Red Alert LED. The newest Alert detected will flash first DESCRIPTION FUNCTION and the oldest last. There will be a 2 second delay be- tween Alert Code flashes. -
Page 55: Furnace Alert Codes
Installer’s Guide TABLE 24- FURNACE ALERT CODES REVISION: 9 CN: 9108T00 DATE: 2009-6-12 Alert Notification Alert Alert Group Alert Description Code Fault LED COM LED User Interface Display Control Display Flame is off when flame should be RECYCLE detected. Furnace tries to relight Flame lost or Ignition itself. - Page 56 Other patents are pending. Made under license. 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 The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.
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Questions and answers
What is the flashing red light?
The flashing red light on the American Standard UHMB080ACV3VB Series indicates specific errors based on the number of flashes:
- 2 Flashes: External Lockout (3 Retries or 11 Recycles Exceeded)
- 3 Flashes: Pressure Switch or Inducer Error
- 4 Flashes: Open High, Auxiliary, or Roll-out Limit Switch
- 5 Flashes: Flame Sensed When No Flame Should Be Present
- 6 Flashes: Earth Ground Not Detected or Poor, Reversed Polarity, Igniter or Triac Error
- 7 Flashes: External Gas Valve Circuit Error (Voltage present when it should not be)
- 8 Flashes: Low Flame Sensor (Less than 1 dc micro-amp)
- 9 Flashes: Open Inducer Limit Communication Error (Loss of communication between comfort control & furnace control)
- Solid Red: Internal Gas Valve Circuit Error or Continuous Reset Caused by an Internal Error (Damaged furnace control)
This answer is automatically generated