SYSTEM LOCKOUT AND DIAGNOSTIC FEATURES

SYSTEM LOCKOUT FEATURES

FAULT RECALL

When system lockout occurs, the gas valve is de-energized, the circulator blower is energized at heat speed, and, if flame is sensed, the inducer blower is energized. The diagnostic indicator light will flash or glow continuously to indicate system status. (System lockout will never override the precautionary features.)

To reset the control after system lockout, do one of the following:

1.Interrupt the call for heat or cool at the thermostat for at least one second but less than 20 seconds (if flame is sensed with the gas valve de-energized, interrupting the call for heat at the thermostat will not reset the control).

2.Interrupt the 24 VAC power at the control for at least one second. You may also need to reset the flame rollout sensor switch.

3.After one hour in lockout, the control will automatically reset itself.

DIAGNOSTIC FEATURES

The 50M56-743 control continuously monitors its own operation and the operation of the system. If a failure occurs, the LED will indicate a failure code as shown on page 8. If the failure is internal to the control, the LED will stay off or flash 8 times. In this case, the entire control should be replaced, as the control is not field-repairable.

Failure codes will flash the LED in the following flash- pause sequences to indicate failure status (each flash will last approximately 0.25 seconds, and each pause will last approximately 2 seconds).

The last five fault codes stored can be displayed on the diagnostic LED. When the control is in standby mode (no call for heat or cool), press the FAULT RECALL switch for approximately two seconds or until the diagnostic LED turns off. Release the switch and the LED will remain off for two seconds. Then the fault codes will display beginning with the most recent fault first with a two second pause between codes. After the stored fault codes have all displayed, the LED will remain off for two seconds and then turn on to indicate return to normal status. While displaying the stored fault codes, the control will ignore any new call for heat, cool or fan.

FAULT CODE RESET

The stored fault codes can be erased from memory. When the control is in standby mode (no call for heat or cool), press the FAULT RECALL switch for five to ten seconds or until the diagnostic LED begins to rapid flash. When the switch is released, the LED will turn off for two seconds to indicate the codes are erased. After two seconds the LED will turn on to indicate return to normal status. If the switch is held pressed for over ten seconds the rapid flash will stop and the LED will be on to indicate return to normal status.

The 50M56-743 has only one serviceable part –an automotive type fuse, which protects the low voltage transformer from damage if the output is short-circuited. If the fuse has opened up, remove whatever caused the short circuit and replace the fuse with only a 3 Amp automotive type fuse. If the fuse does not correct the condition, replace the entire 50M56-743 control. There are no other user serviceable parts.

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White Rodgers 50M56-7433 System Lockout and Diagnostic Features, System Lockout Features, Fault Code Reset
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50M56-743, 50M56-7433 specifications

The Emerson 50M56-7433 and 50M56-743 represent a series of advanced air conditioning and refrigeration system controls that have gained significant traction in industrial and commercial applications. Known for their versatility and reliability, these devices are designed to meet the demands of modern HVAC systems, offering a combination of innovative technologies and efficient performance.

One of the most notable features of the Emerson 50M56-7433 and 50M56-743 is their state-of-the-art microprocessor-based control systems. These controls provide precise temperature management and operational efficiency, ensuring optimal performance across various conditions. The microprocessor technology allows the devices to adapt to changing environments and provide real-time feedback for enhanced decision-making.

Another key characteristic is the integrated communication capabilities of the 50M56 series. These controls support various communication protocols, enabling seamless integration into existing building management systems. This interoperability facilitates centralized monitoring and control, allowing operators to optimize energy usage and reduce operational costs. Furthermore, remote access features are often included, providing users with the ability to adjust settings and monitor system performance from anywhere.

The Emerson 50M56-7433 and 50M56-743 also feature robust safety and diagnostic functions. Built-in alarms and alerts notify users of any operational issues, helping to prevent potential system failures and downtime. The advanced diagnostic capabilities allow for quick troubleshooting, ensuring that technicians can address problems swiftly, thereby minimizing disruptions.

Energy efficiency is another prominent aspect of these control systems. The Emerson series is designed to optimize energy consumption through intelligent scheduling and adaptive control strategies. These features can lead to significant cost savings over the product's lifespan, making it an attractive option for businesses looking to enhance their sustainability practices.

In conclusion, the Emerson 50M56-7433 and 50M56-743 are cutting-edge HVAC control solutions that combine advanced technology, reliability, and energy efficiency. Their microprocessor-based systems, comprehensive communication features, and robust safety functionalities make them an excellent choice for any commercial or industrial application needing effective climate control. With a focus on user-friendly operation and energy savings, these controls solidify Emerson's position as a leader in the HVAC industry.
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