INTEGRATED FURNACE

 

TROUBLESHOOTING

CONTROL MODULE

 

GUIDE

 

 

 

 

 

 

 

 

 

 

!WARNING

Failure to read and follow all instructions carefully before in- stalling or operating this control, could cause personal injury and/ or property damage.

50A55 INTEGRATED FURNACE CONTROL MODULE

Qualified Serviceman’s Troubleshooting Guide

TROUBLESHOOTING PROCEDURE

If the light on the module is on continuously, the fault is likely to be internal to the module. To make sure, interrupt line or 24 volt thermostat power for a few seconds and then restore. If internal fault is indicated again, and flame sensor is not shorted to ground, replace control. A flashing light indicates the problem is most likely in the external components or wiring. Proceed as follows:

!WARNING

Turn power off before any troubleshooting or servicing begins.

Line voltage (120 VAC) could be present on the surface of the ignitor, if the sys- tem is not correctly wired. Such voltage can cause serious injury or death.

The following steps must be performed first before any troubleshooting begins.

1)Disconnect electric power to system at main fuse or circuit breaker.

2)Visually inspect equipment for apparent damage. Check wiring for loose connections.

3)Check for proper grounding and reversed polarity.

A.Check continuity for C terminal on module to electrical service ground and connection at the furnace junction box. If ground connection is open, check module ground connection and the electrical service ground connection.

Repair and retest.

B.Re-connect electric power to system.

C.Check for voltage between the line neutral terminal and furnace ground. If voltage exists, the main power supply lines are improperly connected to the furnace (REVERSED POLARITY). Again disconnect electric power to system; then reverse incoming supply leads to furnace. Repeat step.

D.Recheck system for proper operation.

If neither apparent damage, loose connection nor reversed polarity is the problem, proceed to troubleshooting chart or fault index chart that is suggested by the actual condition.

NOTE: This troubleshooting guide is not for 50A55-4XX modules found on Trane equipment or 50A55-1XX modules found on Lennox equipment.

FAULT INDEX CHART

No manual fan

1A

- 1K

Power supply and voltage

1C - 1G

No fan at cooling speed

2A

- 2L

No induced draft motor

3A

- 3H

LED flashing 2X without inducer

3E

 

LED flashing 3X with inducer

3I - 3O

Ignitor does not glow

4A

- 4D

Burner does not stay lit

4E - 4N

Gas supply problem

4F - 4K

No outlet pressure

4H - 4J

Gas valve does not energize

4L - 4N

Flame sensor fault

5A

- 5P

Burner ground

5K

 

Polarity check

5L - 5M

Ignitor stays on after burner ignition

5B - 5C

TECHNICAL HELP

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Emerson 50A55 manual Integrated Furnace Troubleshooting Control Module Guide
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50A55 specifications

The Emerson 50A55 is an advanced digital thermostat designed to enhance home comfort with energy-efficient climate control. This state-of-the-art device combines modern technology with user-friendly features, making it an ideal solution for both residential and commercial applications.

One of the main features of the Emerson 50A55 is its versatile programming capability. The thermostat supports a 5-2 day programming structure, allowing users to customize their heating and cooling schedules to fit their lifestyle. Users can set different temperatures for weekdays and weekends, ensuring that energy is not wasted when homes are unoccupied.

Another prominent characteristic of the Emerson 50A55 is its intuitive touch-screen interface. The large, easy-to-read display allows users to navigate through settings seamlessly. The interface includes large buttons and clear icons, enhancing the overall user experience. Additionally, backlighting ensures visibility in low-light conditions, making adjustments easy at any time.

The Emerson 50A55 is equipped with advanced technologies such as Smart Setback, which automatically adjusts the temperature according to preset schedules. This feature helps optimize energy usage while maintaining comfort levels. The thermostat also includes a smart recovery technology that learns how long it takes to reach set temperatures, ensuring that the desired climate is achieved by the scheduled time.

Compatibility is another significant advantage of the Emerson 50A55. It works with a variety of heating and cooling systems, including conventional systems, heat pumps, and multi-stage units. This flexibility makes it a valuable addition to any home or building.

Energy efficiency is at the forefront of the Emerson 50A55, featuring Energy Star certification. This certification indicates that the thermostat meets strict energy efficiency guidelines, ultimately aiding homeowners in reducing their energy bills.

Additionally, the Emerson 50A55 includes an easy-to-read indicator for filter replacement, which reminds users when it's time to change their HVAC filters. This feature not only promotes better indoor air quality but also prolongs the lifecycle of the HVAC system.

In conclusion, the Emerson 50A55 digital thermostat is a comprehensive solution for those looking to improve their home heating and cooling efficiency. With its programmable features, user-friendly interface, and energy-saving technologies, it delivers both convenience and performance. This makes it an excellent investment for anyone aimed at achieving a comfortable indoor environment while reducing energy costs.
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