White Rodgers 50A62-820 Manual FAN on Mode, Precautionary Features, System Lockout Features

Models: 50A62-820

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MANUAL FAN ON MODE

If the thermostat fan switch is moved to the ON position, the circulator fan (fan speed) and optional electronic air cleaner are energized. When the fan switch is returned to the AUTO position, the circulator fan and electronic air cleaner (optional) are de-energized.

PRECAUTIONARY, SYSTEM LOCKOUT, AND DIAGNOSTIC FEATURES

PRECAUTIONARY FEATURES

The following precautionary features are built into the 50A62 control.

1.If, at any time, the flame rollout sensor opens, the gas valve and ignitor are de-energized.

2.If, at any time, flame is sensed when the gas valve is de-energized, the heat circulator blower and inducer fan are energized and the ignition sequence will go into system lock out. The heat circulator and inducer will remain on as long as flame is detected. If flame is no longer detected, the inducer will turn off in 5 seconds and the circulator will turn off using the maximum heat off delay.

3.If, at any time, the flame rollout switch opens, the heat circulator blower and inducer fan are energized and the ignition sequence will go into system lock out. The inducer will remain energized for 5 seconds. The circulator will remain on as long as the flame rollout switch is detected open, then use the maximum heat off delay.

4.If at any time the main valve sense input does not correspond to the program’s requested gas valve state, the inducer is de-energized and the ignition sequence will go into system lock out. The heat circulator blower will be energized using the maxi- mum heat off delay, provided a heat off delay is already in progress.

SYSTEM LOCKOUT FEATURES

When system lockout occurs, the gas valve is de-ener- gized, the circulator blower is energized at heat speed, and, if flame is sensed, the inducer blower is energized for 5 seconds. The diagnostic indicator light will flash or glow continuously to indicate system status. (System lockout will never override the precautionary features de- scribed above.)

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

1.Interrupt the call for heat at the thermostat for at least one second (if flame is sensed with the gas valve de- energized, interrupting the call for heat at the thermo- stat 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 50A62-820 control continuously monitors its own operation and the operation of the system. If a failure occurs, the DIAG 1 and DIAG 2 LEDs will indicate a failure code as shown below.

SAFETY CIRCUIT

DIAG 1

DIAG 2

Limit Control

Slow Flash

On

 

 

 

Pressure Switch

Off

Slow Flash

 

 

 

Watch Guard - Burners

Alternate

Alternate

Failed to Ignite

Slow Flash

Slow Flash

 

 

 

Flame Sensed Without

Slow Flash

Off

Valve Energized

 

 

 

 

 

Roll Out Open or 9-Pin

On

Slow Flash

Connector Disconnected

 

 

 

 

 

Bad Board

On

On

 

 

 

Power On

Simultaneous

Simultaneous

Slow Flash

Slow Flash

 

 

 

 

Low Flame

Slow Flash

Slow Flash

 

 

 

Reverse Polarity

Fast Flash

Slow Flash

 

 

 

Low Voltage or

Alternate

Alternate

Ignitor Disconnected

Fast Flash

Fast Flash

 

 

 

Heat Demand

Simultaneous

Simultaneous

Fast Flash

Fast Flash

 

 

 

 

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White Rodgers 50A62-820 Manual FAN on Mode, PRECAUTIONARY, System LOCKOUT, and Diagnostic Features, Precautionary Features

50A62-820 specifications

The White Rodgers 50A62-820 is a highly regarded, multi-stage thermostat designed to deliver precision comfort control in various HVAC systems. With its advanced features and reliable performance, it has become a popular choice among both homeowners and HVAC professionals.

One of the primary features of the 50A62-820 is its compatibility with a wide range of heating and cooling systems. This includes gas, oil, and electric furnaces, as well as heat pumps and air conditioning systems. Its versatility makes it suitable for many applications, ensuring that users can maintain optimal climate control in their homes or facilities.

The thermostat utilizes a user-friendly interface that simplifies operation. Its digital display clearly shows the current temperature and system settings, enabling easy monitoring and adjustments. This interface often includes intuitive buttons or touch screen functionality, allowing users to navigate through settings with ease.

A standout characteristic of the White Rodgers 50A62-820 is its programmable capabilities. Users can easily schedule temperature settings for different times of the day or week, which can lead to significant energy savings. For instance, homeowners can program the thermostat to lower temperatures during the night or when the house is unoccupied, contributing to enhanced energy efficiency without sacrificing comfort.

Another technological advantage of the 50A62-820 is its ability to manage multi-stage heating and cooling systems. This allows the thermostat to regulate the temperature more effectively, responding to changes in indoor and outdoor conditions with precision. Multi-stage systems can help to maintain consistent temperatures and improve overall energy efficiency.

The 50A62-820 is also designed with advanced safety features. It includes built-in temperature limit settings, helping to prevent overheating and ensuring that the HVAC system operates within safe parameters. Additionally, many models offer diagnostic capabilities, allowing users to identify issues and perform maintenance more efficiently.

Durability is a notable characteristic of the White Rodgers 50A62-820. Its construction is designed to withstand a variety of environmental conditions, making it a reliable choice for both residential and commercial installations.

In conclusion, the White Rodgers 50A62-820 thermostat is a sophisticated, versatile option for managing climate control in various environments. With its programmable features, compatibility with multi-stage systems, user-friendly design, and advanced safety technologies, it provides homeowners with a practical solution for enhancing comfort while promoting energy efficiency.