UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

Figure 17: Manual Reset Limit Switch

Reset Button

To reset manual reset limit switch, press reset

button. NOTE: To reset, the switch must be cool.

Description

Part Number

Manual Reset Limit Switch

90412106

12.3Lighting Instructions 12.3.1 To Turn On Heater

1. Ensure that the electrical and gas supplies to the heater are on. Check that the on site controls are "ON".

IMPORTANT: The thermostat setting must be above the ambient temperature for the heater to operate.

2.The automatic firing sequence will begin as described on Page 27, Figure 15. The heater will now operate automatically under the control of the on site controls.

12.3.2 To Turn Heater Off

Set the thermostat to the "OFF" position. The burner will turn off immediately.

To restart, turn the thermostat above room temperature.

12.4 Simple Troubleshooting

Some possible reasons for the heater not operating are:

1.Gas supply not "ON".

2.Electricity supply not "ON".

3.The time and/or temperature controls are not "ON".

4.A limit switch may have operated. This may be caused by an interruption of the electrical supply, failure of the distribution fan or vent or heat exchanger blockage.

If a temperature limit switch persistently trips, there is a fault which must be investigated by a contractor qualified in the installation and service of gas-fired heating equipment.

12.4.1 Simple Troubleshooting (Burner Faults)

If the burner fails to ignite for any reason, it will retry for ignition (four trials total). After four unsuccessful ignition trials, the control will put the heater into lockout for one hour.

Lockout should not occur during normal operation of the heater and indicates there is a fault condition which must be corrected. There is an LED light on the ignition control that flashes codes to assist in fault correction. See Page 30, Figure 18 for LED indication codes.

Figure 18: LED Diagnostic Codes

LED INDICATION

FAULT MODE

 

 

Slow Flash

Normal Operation - No call for heat.

 

 

Fast Flash

Normal Operation - Call for heat.

 

 

2 Flashes

Ignition Lockout - No flame detected.

 

 

3 Flashes

Airflow Fault - Pressure switch open or closed.

 

 

4 Flashes

Temperature Limit or

 

Manual Reset Limit Switch Open

 

 

5 Flashes

Flame Sense Error - Gas valve not energized.

 

 

Steady On

Internal Control Failure

 

 

30 of 47

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Roberts Gorden 125, 75, 100 Lighting Instructions 12.3.1 To Turn On Heater, To Turn Heater Off, Simple Troubleshooting

125, 100, 75 specifications

Roberts Gordon is a recognized leader in the manufacturing of innovative heating solutions, with a diverse product line including the 100, 125, 75, 45, and 60 series of radiant tube heaters. Each model is designed to meet specific heating needs while emphasizing efficiency, durability, and performance.

The Robert Gordon 100 series is known for its high efficiency and ability to provide consistent warmth in large industrial spaces. It features advanced infrared technology, which heats objects and surfaces directly, resulting in quicker temperature increases and enhanced comfort. This model is equipped with modulating burners that allow for optimal gas usage and can be easily integrated into existing systems.

The 125 series builds upon the efficiency of the 100 model while offering increased heating capacity. Its robust design ensures it can handle the demands of larger applications, such as warehouses and manufacturing facilities. With enhanced control options, users can tailor the heating output to match specific operational requirements, reducing energy consumption.

The 75 series offers a compact solution for smaller commercial spaces, providing a reliable heating source without taking up excessive floor space. Its lightweight design facilitates easy installation, while the modular approach allows for scalability to meet changing heating demands. This series emphasizes sustainability, utilizing advanced combustion technologies that minimize emissions.

For smaller applications, the 45 series stands out with its efficient heating capabilities in confined spaces. This series features simple, yet effective controls, enabling straightforward operation. The robust construction ensures durability, making it well-suited for different commercial environments, including retail settings or small workshops.

Finally, the 60 series combines the best features of the range with energy conservation as a primary focus. Its innovative design incorporates smart technology to monitor energy usage and optimize performance. The heaters are equipped with the latest in safety features, providing peace of mind for users.

Overall, Roberts Gordon’s radiant tube heaters showcase a commitment to high-quality heating solutions that cater to a variety of industrial and commercial applications. With energy efficiency, superior durability, and advanced heating technologies as core characteristics, Roberts Gordon remains a trusted choice for businesses looking to enhance their heating performance.