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Trane S8B1B080M4PSBA Service Facts
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Trane S8B1B080M4PSBA Service Facts

Upflow/downflow/horizontal gas-fired, 1–stage and 2–stage induced draft furnaces with high efficiency motor
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Service Facts
Upflow/Downflow/Horizontal
Gas-Fired, 1–Stage and 2–Stage Induced Draft Furnaces with
High Efficiency Motor
U U p p f f l l o o w w , , D D o o w w n n f f l l o o w w , , H H o o r r i i z z o o n n t t a a l l R R i i g g h h t t / / L L e e f f t t
Single Stage
S8B1B080M4PSBA
S8X1B080M4PSBA
S8B1D120M5PSBA
S8X1D120M5PSBA
N N o o t t e e : : Models may have a "T" in the 12th digit designating they meet California
less than 40 ng/J (NOx) emissions requirements.
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 precautions in the literature and on the tags, stickers, and labels that
are attached to the equipment.
November 2020
Two Stage
S8X2B080M4PSBA
S8X2D120M5PSBA
S S A A F F E E T T Y Y W W A A R R N N I I N N G G
S S 8 8 X X B B - - S S F F - - 2 2 B B - - E E N N
S8X1
S8B1
N N o o t t e e : : Graphics in this document are for
representation only. Actual model may
differ in appearance.
S8X2

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Summary of Contents for Trane S8B1B080M4PSBA

  • Page 1 U U p p f f l l o o w w , , D D o o w w n n f f l l o o w w , , H H o o r r i i z z o o n n t t a a l l R R i i g g h h t t / / L L e e f f t t Single Stage Two Stage S8B1B080M4PSBA S8X1B080M4PSBA S8X2B080M4PSBA...
  • Page 2 SAFETY SECTION NON-CONDENSING FURNACES I I m m p p o o r r t t a a n n t t : : — This document pack contains a wiring W W A A R R N N I I N N G G diagram and service information.
  • Page 3 S S A A F F E E T T Y Y S S E E C C T T I I O O N N N N O O N N - - C C O O N N D D E E N N S S I I N N G G F F U U R R N N A A C C E E S S W W A A R R N N I I N N G G W W A A R R N N I I N N G G W W A A R R N N I I N N G G ! !
  • Page 4 S S A A F F E E T T Y Y S S E E C C T T I I O O N N N N O O N N - - C C O O N N D D E E N N S S I I N N G G F F U U R R N N A A C C E E S S W W A A R R N N I I N N G G W W A A R R N N I I N N G G E E X X P P L L O O S S I I O O N N H H A A Z Z A A R R D D ! !
  • Page 5 S S A A F F E E T T Y Y S S E E C C T T I I O O N N N N O O N N - - C C O O N N D D E E N N S S I I N N G G F F U U R R N N A A C C E E S S C C A A U U T T I I O O N N C C A A U U T T I I O O N N S S H H A A R R P P E E D D G G E E H H A A Z Z A A R R D D ! !
  • Page 6 . . The following steps shall be followed for each appliance connected to the venting For more information, visit www.trane.com and www. system being placed into operation, while americanstandardair.com or contact your installing dealer.

  • Page 7: Product Specifications

    Product Specifications S8B1B080M4PSBA S8B1D120M5PSBA MODEL S8X1B080M4PSBA S8X1D120M5PSBA Upflow / Horizontal / Downflow Upflow / Horizontal / Downflow TYPE RATINGS Input BTUH 80,000 120,000 Capacity BTUH (ICS) 64,800 97,700 Temp. Rise (Min.-Max.)°F 30 - 60 30 - 60 AFUE – Rating Return Air Temp.
  • Page 8 P P r r o o d d u u c c t t S S p p e e c c i i f f i i c c a a t t i i o o n n s s S8X2B080M4PSBA S8X2D120M5PSBA MODEL...
  • Page 9 Sequence of Operation S8B1/S8X1/S8X2 N N o o t t e e : : The seven-segment LED readout is based on 7. The first burner will ignite, and flame will crossover thermostat input. For the S8X2, during to the remaining burners establishing current to the simultaneous call for W1 and W2, the seven- flame sensor.
  • Page 10 S S e e q q u u e e n n c c e e o o f f O O p p e e r r a a t t i i o o n n S S 8 8 B B 1 1 / / S S 8 8 X X 1 1 / / S S 8 8 X X 2 2 N N o o t t e e : : If PS2 does not close within the 45 seconds, the •...

  • Page 11: Periodic Servicing Requirements

    Periodic Servicing Requirements 1. GENERAL INSPECTION – E E x x a a m m i i n n e e t t h h e e f f u u r r n n a a c c e e N N o o t t e e : : Be careful NOT to break igniter when removing i i n n s s t t a a l l l l a a t t i i o o n n a a n n n n u u a a l l l l y y f f o o r r t t h h e e f f o o l l l l o o w w i i n n g g i i t t e e m m s s : : burners.

  • Page 12: Wiring Diagrams

    Wiring Diagrams NOTES: 1. IF ANY OF THE ORIGINAL WIRING SUPPLIED WITH THIS FURNACE MUST BE REPLACED, IT MUST BE WITH WIRE HAVING A TEMPERATURE RATING OF AT LEAST 105°C. WIRES 12, 18, 20, 48, 49, 50, 51, 92 & 93 MUST BE RATED TO 250°C. 2.
  • Page 13 W W i i r r i i n n g g D D i i a a g g r r a a m m s s 120v 60 Hz. 1 PH NOTES: POWER SUPPLY PER LOCAL CODE 1. IF ANY OF THE ORIGINAL WIRING AS SUPPLIED WITH THIS FURNACE MUST BE REPLACED, IT MUST BE WITH WIRE HAVING A TEMPERATURE RATING OF AT LEAST 105°C.
  • Page 14 W W i i r r i i n n g g D D i i a a g g r r a a m m s s 120v 60 Hz. 1 PH POWER SUPPLY PER LOCAL CODE NOTES: JUNCTION BOX 1.

  • Page 15: Airflow Tables

    Airflow Tables Furnace Airflow (CFM) Vs. External Static Pressure (in. W.C.) Model — — — 1220 1080 1403 1298 1192 1087 S8B1B080M4PSBA S8X1B080M4PSBA 1524 1428 1336 1248 1164 S8X2B080M4PSBA 1684 1574 1544 1401 1337 1700 1625 1551 1476 1401 1858...
  • Page 16 CFM Versus Temperature Rise S8B1/S8X1 Furnaces have one stage heating S8X2 Furnaces have two stage heating. First Stage is Low heating and Second Stage is High heating. Table 1. S8B1/S8X1 CFM Versus Temperature Rise Model 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 S8*1B080M4PSBA S8*1D120M5PSBA Table 2.
  • Page 17 Integrated Furnace Control Menu S8XB-SF-2B-EN...
  • Page 18 I I n n t t e e g g r r a a t t e e d d F F u u r r n n a a c c e e C C o o n n t t r r o o l l M M e e n n u u S8XB-SF-2B-EN...
  • Page 19 I I n n t t e e g g r r a a t t e e d d F F u u r r n n a a c c e e C C o o n n t t r r o o l l M M e e n n u u S8XB-SF-2B-EN...
  • Page 20 I I n n t t e e g g r r a a t t e e d d F F u u r r n n a a c c e e C C o o n n t t r r o o l l M M e e n n u u S8XB-SF-2B-EN...
  • Page 21 I I n n t t e e g g r r a a t t e e d d F F u u r r n n a a c c e e C C o o n n t t r r o o l l M M e e n n u u S8B1 - S8X1 - S8X2 Run Test Mode Run Test Mode:...
  • Page 22 Belly Band Location Distance from belly band to the front face of motor for minimum vibration Furnace Model Dimension “A” (inches) 4.25 (4–1/4) B080 1.00 Blower housing and wheel removed from view for clarity. Furnace Model Dimension “A” (inches) 4.125 (4–1/8) D120 2.375 Blower housing and wheel removed from view for clarity.

  • Page 23: Troubleshooting

    Troubleshooting The following pages include troubleshoo ng flowcharts in reference for the 1 Stage S8B1, S8X1 and 2 Stage S8X2 families of furnaces only. The informa on contained is for reference only and does not cover all scenarios or problems that may be encountered. ONLY qualified technicians should a empt to install, troubleshoot, or repair this appliance.
  • Page 24 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g S8B1 IFC Component Layout Neutral LINE Inducer/Igniter Connections Connections Connector 6 Pin CTM Connector IGN-N...
  • Page 25 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g S8X1 IFC Component Layout EAC, HUM LINE Neutral Dry Contacts Inducer/Igniter Connections Connections...
  • Page 26 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g S8X2 IFC Component Layout EAC, HUM LINE Neutral Inducer/Igniter Dry Contacts Connections Connections Connector...
  • Page 27 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g GETTING STARTED Is 120 VAC Is the IFC Seven Is 120 VAC Is 120 VAC measured measured Segment LED on?
  • Page 28 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION 2.1 Fault Code RETRY Lock Out = 3 unsuccessful tries for igni on within a single call for heat.
  • Page 29 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION 2.2 Fault Code RECYCLE Lock Out = 10 recycles within a single call for heat.
  • Page 30 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION An error has occurred with the PS1, indica ng that the pressure Note #1 switch is closed when it should be open.
  • Page 31 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION Note #1 An error has occurred with the PS1 indica ng that the pressure switch is either open when it should be closed.
  • Page 32 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION An error has occurred with the PS2, indica ng that the pressure Note #1 switch is closed when it should be open.
  • Page 33 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION Note #1 An error has occurred with the PS2 indica ng that the pressure 24 volts = Open Switch switch is open when it should be closed.
  • Page 34 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g See next page for DEFINITION 4.0 Fault Code addi onal 4 flash Limit switches are safety devices faults that will open when an abnormal...
  • Page 35 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION 4.0 Fault Code Limit switches are safety devices Flame Rollout that will open when an abnormal high temperature has been sensed.
  • Page 36 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION 5.0 Fault Code Flame is sensed when it should not be sensed. Disconnect electrical power to furnace Turn off...
  • Page 37 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINI Polarity Fault – Incoming high voltage 6.1 Fault Code wiring is reversed Connect volt meter to white incoming...
  • Page 38 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION: Igniter Relay Fault – The control board has sensed 6.3 Fault Code that the igniter relay has stuck closed igniter Fault –...
  • Page 39 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION: External Gas Valve 7.1 Fault Code Circuit Error (24 volts is present when it should not be present) Turn Comfort Control to “OFF”...
  • Page 40 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g DEFINITION: 08 Fault Code The flame sense current is less than 0.5 micro-amp DC Make a call for hea ng...
  • Page 41 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g 11 Fault Code Defini on: The IFC has detected that internal gas valve relays have failed.
  • Page 42 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g Con nuous FAN on this unit is limited to TAP 1 only.

  • Page 43: Part List

    Part List • Igniter • Inducer Assembly • Pressure Switch(es) • Flame Sensor • Blower Motor • Main Thermal Limit • In-shot Burner(s) • Blower Wheel • Roll-Out Switch(es) • Gas Valve • IFC (Integrated Furnace Control) • Reverse Air Switch(es) S8XB-SF-2B-EN...
  • Page 44 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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S8b1d120m5psbaS8x1b080m4psbaS8x1d120m5psbaS8x2b080m4psbaS8x2d120m5psba