Trane S8B1A040M3PSC

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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.
May 2022
SS88XXBB--SSVVXX000011--11AA--EENN
Upflow/Downflow/Horizontal
Gas-Fired, 1–Stage and 2–Stage Induced Draft Furnaces with
High Efficiency Motor
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Single Stage Two Stage
S8B1
S8X1
S8X2
S8B1A026M2PSC
S8B1A040M3PSC
S8B1B040M2PSC
S8B1B060M4PSC
S8B1B080M4PSC
S8B1C080M5PSC
S8B1C100M5PSC
S8B1D120M5PSC
S8X1A026M2PSC
S8X1A040M3PSC
S8X1B040M2PSC
S8X1B060M4PSC
S8X1B080M4PSC
S8X1C080M5PSC
S8X1C100M5PSC
S8X1D120M5PSC
S8X2A040M3PSC
S8X2B060M4PSC
S8X2B080M4PSC
S8X2C080M5PSC
S8X2C100M5PSC
S8X2D120M5PSC
NNoottee:: This Installation, Operation, and Maintenance is used for multiple furnace
families. Models may have a “T” in the 12th digit designating they meet
California less than 40 ng/J (NOx) emissions requirements.
NNoottee:: Graphics in this document are for
representation only. Actual model may
differ in appearance.
S8XB-SVX001-1A-EN
Installation, Operation, and Maintenance

Trane S8B1A040M3PSC Specifications

General

Model Number	S8B1A040M3PSC
Category	Furnace
Type	Gas
Input BTU	40, 000
Efficiency	80%
Stages	Single Stage
Heat Exchanger	Aluminized Steel
Fuel Type	Natural Gas
Ignition Type	Hot Surface
Warranty	5-Year Limited Warranty on Parts
Output BTU	32, 000 BTU/h

Summary

Safety Section Non-Condensing Furnaces

Furnace Installation Guidelines

Safety Practices and Precautions

Essential safety practices and precautions to follow during installation, servicing, and operation.

Locations and Clearances

Guidelines on selecting installation locations and maintaining minimum clearances for furnace safety.

Wiring Diagrams

Furnace General Installation

Gas Piping

Detailed instructions and diagrams for connecting the gas supply to the furnace.

Combustion and Input Check

Procedure for verifying proper combustion and input rate of the furnace.

Gas Valve Adjustment

Steps for adjusting the gas valve manifold pressure for correct operation.

High Altitude Derate

Instructions for adjusting furnace input rate and orifices for high altitude installations.

Air for Combustion and Ventilation

Requirements for providing adequate airflow for combustion and ventilation.

Duct Connections

Return Duct Connections

Electrical Connections

Field Wiring

Diagrams illustrating field wiring connections for thermostats and outdoor units.

General Start-up and Adjustment

Preliminary Inspections

Lighting Instructions

Steps for safely lighting and starting the furnace.

Control and Safety Switch Adjustment

Guidance on adjusting and checking safety switches for proper operation.

Integrated Furnace Control Menu

Run Test Mode

Procedure for entering and executing the furnace's run test mode.

Setting Airflow

Fault Code Recovery

Troubleshooting

Troubleshooting Flowchart Index

2.1 Fault Code

Troubleshooting flowchart for fault code E2.1 (Flame not sensed).

2.2 Fault Code

Troubleshooting flowchart for fault code E2.2 (Flame sensed then lost).

2.3 Fault Code

Troubleshooting flowchart for fault code E2.3 (1st stage gas valve error).

3.1 Fault Code

Troubleshooting flowchart for fault code E3.1/E3.2 (Pressure switch issues).

3.2 Fault Code

Troubleshooting flowchart for fault code E3.2/E3.4 (Pressure switch issues).

3.3 Fault Code

Troubleshooting flowchart for fault code E3.3 (PS2 closed when it should be open).

3.4 Fault Code

Troubleshooting flowchart for fault code E3.4 (PS2 open when it should be closed).

4.0 Fault Code

Troubleshooting flowchart for blower motor and limit switch issues.

4.0 Fault Code Flame Rollout

5.0 Fault Code

6.1 Fault Code

6.2 Fault Code

6.3 Fault Code

7.1 Fault Code

08 Fault Code

11 Fault Code

12 Fault Code

Constant Torque Motor Troubleshooting

Sequence of Operation S8 B1 S8 X1 S8 X2

1 st Stage Gas Heating

2 nd Stage Gas Heating (S8 X2 Only)

Periodic Servicing Requirements