Thomas & Betts UDAS Flame Rollout Switch Sizes 30-125 only, Disconnect, Vent or Vent, Combustion

Page 34
• 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
Image 34
Page 33 Page 35
Contents Table of Contents Series Fan-Type Unit HeatersHazard Levels of Warnings in this Manual Installation CodesGeneral Venting Manual by ModelWarranty Uncrating and Preparation Massachusetts RequirementDimensions SizeModel Udas Separated Combustion Fan Technical Data Size 100 125High Altitude Operation Instructions for Changing Pressure SwitchPressure Switch ClearancesCombustion Air applies to Model Udap and Model Model Udap and Model UDAP-CVHeater Throw Unit Heater LocationLocation Recommendations Model Udap Size 100 125 150 175 225 250 300 350 400 Unit Heater Location cont’dHanging the Heater Model Udas Size 100 125 150 175 225 250 300 350 400Be sure Threaded swivel Connectors areRecommended maximum hanger rod length is 6 feet 1.8M Locked toSizing Gas Supply Line Gas Piping and PressuresGas Connection Size Instructions Instructions for High Altitude Derate Manifold Pressure Settings by Altitude for CanadaGas Piping and Pressures cont’d Two -Stage ValveHigh Altitude Capacity Changes Feet MetersBurner Electrical Supply and Connections Thermostat and ConnectionsCombustion Air Proving Switch Pressure Switch Combustion Air Proving Pressure Switch SettingsLimit Control Normal Heat Cycle Operating Sequence Door Switch Model Udas only Ignition SystemDip Switch StatusLED LightsIgnition System cont’d SW1 SW2 TimeContinuous Fan Operation Fault Modes Fault Modes cont’d Lockout Gas Valve Fan MotorWiring Diagrams Operating SequenceWiring Diagrams cont’d SW1 Check the installation prior to startup Heater Startup Check Installation and StartupOperating Instructions Operating Sequence Check installation after startup Vent System Testing Procedure Model UdapStartup cont’d Maintenance ScheduleUse only factory-authorized parts Heat Exchanger Maintenance Burner Maintenance Burner Removal Instructions Refer to FigureInstructions to Re-Install the Burner Refer to Figure Burner Maintenance cont’dInspect and Clean the Burner Re-Install the Burner Burner OrificeDSI Cont’d IgnitionSystem Fan BladesOperating Gas Valve Combustion Air Pressure SwitchDoor Switch Udas onlyAir System Troubleshooting Flame Rollout Switch Sizes 30-125 onlySwitch DisconnectWill not start General TroubleshootingVenter motor Burner willTroubleshooting cont’d Cont’d

UDAP, UDAS specifications

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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.

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