• Restricted combustion air inlet or exhaust outlet in combination with a defective pressure switch
• Building exhaust
• Electrical power interruption during operation

37.Flame Rollout Switch - Sizes 30-125 only

For location, see FIGURE 18, page 31.

The cause of a flame rollout switch activating must be determined. Activation of the manually reset flame rollout switch could be caused by one or more of the following:

• Restricted or plugged heat exchanger

• Pressurization of the heat exchanger

If a flame rollout switch trips, inspect the burner/control compartment for signs of excessive heat and burned wiring.

If the compartment appears normal, reset by depressing the red button on the switch. 15 to 20 minutes are required for the switch to cool sufficiently for reset- ting. A distinct click will be felt when the switch resets. Operate the furnace. If the flame rollout switch trips again, determine and correct the cause before reset- ting the switch.

If there is damage to the control compartment, repairs must be made before

resetting the switch.

If it is determined that the flame rollout switch needs replacing, use only the fac- tory-authorized replacement part that is designed for that size of heater.

38. Disconnect

The disconnect switch is located in the sealed electrical box inside the con-

trol compartment with the toggle on the rear of the heater.

Switch -

If it is determined that the disconnect switch needs replacing, use only the

UDAS only

factory-authorized replacement part that is designed for the heater. Always

replace electrical box cover.

 

 

 

 

39. Vent or Vent/

Check the complete system at least once a year. Inspection should include all joints,

Combustion

seams, concentric adapter box (UDAS), inlet air guard or inlet air cap (UDAS), and

the vent terminal cap. Clean openings. Replace any defective parts.

Air System

 

 

40. Troubleshooting

DSI Integrated Control Module

Trial for Ignition

 

 

Call for Heat

 

 

 

 

 

(Circuit Board) Trial

 

 

 

 

 

 

 

Is there a

NO

 

YES

spark across gap at

 

Troubleshooting

 

 

ignitor?

 

 

 

 

 

Flowchart

 

 

Is there

YES

YES Does gas NO

 

 

spark voltage at

ignite?

 

 

 

 

 

control?

 

 

 

 

 

 

 

 

NO

 

Check high voltage wire continuity.

YES

Is there minimum

NO

Is the flame

YES

Clean flame

flame current at the

sensor corroded?

 

 

 

sensor.

 

flame sensor?

 

 

 

 

 

 

 

 

NO

Is there 24V P1-2

YES

to power control?

 

NO

 

Replace control module.

Is there

minimum flame current YES at the control

module?

NO

Replace control

module.

Is the sensor

YES

Replace flame

located in flame

 

sesnsor.

correctly?

 

 

 

NO

Check wiring

and/or 24VAC

transformer output.

Check connections to flame sensor and/or moisture in the burner assembly.

Reposition

flame sensor.

Check gas pressure and supply voltage.

YES

YES

Is the ignitor

Is gas

NO

 

flowing?

 

 

Replace gas

YES

Is there

 

If either are low, correct and repeat startup.

position correct in the

gas flow?

NO

Reposition

spark ignitor.

 

valve.

 

24VAC at the gas

 

 

 

valve?

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

Is there 24VAC

 

Check wiring and

YES

NO

from gas valve output on

 

connections to

 

 

control module to

 

 

gas valve.

 

 

 

 

chassis?

 

 

 

 

 

 

Replace ignition control module.

Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 34

Page 33 Page 35
Page 34
Image 34
Thomas & Betts UDAS, UDAP dimensions Flame Rollout Switch Sizes 30-125 only, Disconnect, Vent or Vent, Combustion
Page 33 Page 35

UDAP, UDAS specifications

Thomas & Betts is a well-respected name in the electrical and industrial products sector, known for its innovation and quality. Among its impressive portfolio, the UDAS and UDAP series of connectors stand out for their reliable performance and advanced features. These connectors are specifically designed to meet the rigorous demands of electrical applications in various industries.

The UDAS (Universal Disconnect Appliance Switch) and UDAP (Universal Disconnect Appliance Plug) are engineered for high-capacity applications where safety, efficiency, and ease of use are paramount. One of the main features of these connectors is their ability to deliver increased electrical resistance and durability. They are constructed from high-quality materials that can withstand extreme environmental conditions, making them ideal for outdoor and harsh industrial applications.

Another key technology employed in the UDAS and UDAP series is the quick-connect mechanism. This innovative design allows users to connect and disconnect circuits swiftly without requiring excessive force or complex tools. This is particularly beneficial in settings where downtime must be minimized and efficiency is crucial. Additionally, the connectors are designed to provide a secure, locking fit to ensure consistent electrical contact, thereby enhancing operational safety.

The UDAS and UDAP connectors are manufactured to comply with several industry standards, ensuring that they meet or exceed the requirements for electrical safety and performance. Their user-centric design features help in reducing installation time and costs, making them a preferred choice among contractors and engineers.

Furthermore, these connectors are versatile, compatible with a wide range of electrical systems, and can be employed in applications such as HVAC, lighting, and power distribution. They also come in various sizes and configurations to accommodate diverse specifications, improving customization options for different projects.

In summary, the Thomas & Betts UDAS and UDAP series stands out for their robust design, quick-connect technology, and versatility across various industrial applications. Their durability and compliance with safety standards make them an excellent choice for professionals seeking reliable connectivity solutions in demanding environments. Investing in these connectors ensures optimal performance and safety in electrical installations, showcasing Thomas & Betts' commitment to excellence in electrical components.
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