TROUBLESHOOTING

 

 

INTEGRATED FURNACE

GUIDE

 

 

CONTROL MODULE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CHART 5

Flame

Sensor

Check

5A5B

Does main

YES

Does ignitor remain

burner remain

energized with

 

lit?

 

flame present?

NO

 

YES

5E

 

5C

 

 

Is blower

 

NO

at heat speed

YES

within 1 minute

 

 

 

of burner ignition?

 

NO

System is

functioning

properly.

5F

Is resistance

less than

50megohms (50,000,000

Ohms)?

YES

5G

Disconnect lead

from flame sensor. Connect ohmmeter from sensor to burner ground.

De-energize system.

Disconnect 12-pin connector. Connect ohmmeter from flame sensor pin FP to burner GROUND.

5I

 

Disconnect flame

NO

sensor from wire.

Measure continuity from

 

 

wire end to FP pin

 

on 12-pin connector.

 

 

5J

Is sensor

YES

lead good?

 

NO

 

5L

Disconnect AC power to system at main fuse or circuit breaker. Connect voltmeter from control terminal LINE NEUTRAL to BURNER GROUND. Energize module.

5K YES Is

control

ground wire connected to burner ground?

NO

5D

Is 120V

present at

control terminals YES HEAT & CIR NEUTRAL?

NO

5M

Is 120V

present at YES burner ground?

NO

5N

Connect a microammeter

in series with flame sensor and sensor lead. Energize system. Measure current when burner ignites.

5O

Repair wiring and/or replace indoor blower motor. Check operation.

Replace control module. Check operation.

Reverse 120V

LINE & NEUTRAL

wires. Energize system. Check operation.

Clean surface of flame sensor with fine steel wool. Reinstall. Check operation.

5P YES

TECHNICAL HELP

5H

Is resistance

less than

50 megohms?

YES

Replace sensor. Energize system. Check operation.

Repair or

Connect ground

wire from burner to

replace wire.

12-pin connector

Energize system.

terminal GROUND.

Check operation.

Check operation.

 

NO

Replace flame

sensor lead. Check

operation.

Is 1 microamp

NO

or more

 

present?

 

YES

 

Replace control.

Check operation.

Remove

sensor.

Does sensor

have carbon or

dust buildup?

NO

!WARNING

If diagnostic indicator (LED)

shows continuous flashing, turn off gas supply at source before disconnecting electrical power!

194

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Emerson 50A55 manual System is Functioning Properly, Reverse, Replace flame Sensor lead. Check Operation

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.