Thomas & Betts UDAP, UDAS dimensions Heat Exchanger Maintenance Burner Maintenance

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26.Heat Exchanger Maintenance

27.Burner Maintenance

This heater is equipped with a TCORE2® heat exchanger (patent pending).

Remove any external dirt or dust accumulation. Visually check the heat exchanger for cracks and holes. If a crack or hole is observed, replace the heat exchanger.

NOTE: Inspection of the lower portion of the heat exchanger is done with the burner removed. See the Burner Service section below for information on inspect- ing the lower portion of the heat exchanger.

This heater is equipped with a TCORE2® burner (patent pending).

Inspect the burner/control compartment annually to determine if cleaning is nec- essary. If there is an accumulation of dirt, dust, and/or lint, clean the compartment and follow the instructions below to remove and clean the burner.

Burner Removal Instructions (Refer to FIGURE 17.)

FIGURE 17 - Burner Removal (UDAP illustrated; same process for both UDAP and UDAS)

CAUTION: Use of eye protection is recommended.

1.Outside the cabinet, shut the gas supply off at the manual valve ahead of the union.

2.Turn off electric supply.

3.Disconnect the gas supply at the union outside of the cabinet.

4.Remove the access panel.

5.Disconnect the Gas Train and Move Out of the Way - At the gas valve, mark and disconnect the wires. Carefully remove the burner orifice and orifice adapter locking nut. Slide the orifice adapter out through the bracket on the burner pushing the gas train to the right. This will move the gas train out of the way.

6.Move the Control Assembly - Remove the two screws holding the control assembly bracket. Being careful not to disconnect any wires, slide the control assembly to the right.

7.Remove Secondary Air Baffles (Sizes 60-400 only) - Vertical along the right side of the burner, locate the flat plate(s) identified as the secondary air baffle(s). The quantity of baffles could be one to four depending on heater

Burner Body Support (at least two per unit) - Remove screw attaching to secondary air shield. Support remains attached to burner.

Secondary Air Shield

Burner Assembly

Burner

Orifice

Venturi Tube

Slide right; rotate inward; pull out

Slide Right

Gas Valve

Disconnect gas train at orifice and outside the heater; slide to the right.

Secondary Air Baffle

Control Bracket Screws -

(Qty varies per size.)

Loosen bracket; slide right.

Mark locations before removing.

 

Orifice Adapter Locking Nut

Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 29

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Contents Series Fan-Type Unit Heaters Table of ContentsGeneral Installation CodesHazard Levels of Warnings in this Manual Venting Manual by ModelMassachusetts Requirement Warranty Uncrating and PreparationSize DimensionsModel Udas Separated Combustion Fan Size 100 125 Technical DataPressure Switch Instructions for Changing Pressure SwitchHigh Altitude Operation ClearancesModel Udap and Model UDAP-CV Combustion Air applies to Model Udap and ModelLocation Recommendations Unit Heater LocationHeater Throw Hanging the Heater Unit Heater Location cont’dModel Udap Size 100 125 150 175 225 250 300 350 400 Model Udas Size 100 125 150 175 225 250 300 350 400Recommended maximum hanger rod length is 6 feet 1.8M Connectors areBe sure Threaded swivel Locked toGas Connection Size Gas Piping and PressuresSizing Gas Supply Line Instructions Gas Piping and Pressures cont’d Manifold Pressure Settings by Altitude for CanadaInstructions for High Altitude Derate Two -Stage ValveFeet Meters High Altitude Capacity ChangesThermostat and Connections Burner Electrical Supply and ConnectionsCombustion Air Proving Switch Pressure Switch Limit Control Pressure Switch SettingsCombustion Air Proving Dip Switch Door Switch Model Udas only Ignition SystemNormal Heat Cycle Operating Sequence StatusLED LightsSW1 SW2 Time Ignition System cont’dContinuous Fan Operation Fault Modes Gas Valve Fan Motor Fault Modes cont’d LockoutOperating Sequence Wiring DiagramsWiring Diagrams cont’d SW1 Operating Instructions Operating Sequence Check Installation and StartupCheck the installation prior to startup Heater Startup Vent System Testing Procedure Model Udap Check installation after startupUse only factory-authorized parts Maintenance ScheduleStartup cont’d Burner Removal Instructions Refer to Figure Heat Exchanger Maintenance Burner MaintenanceInspect and Clean the Burner Re-Install the Burner Burner Maintenance cont’dInstructions to Re-Install the Burner Refer to Figure Burner OrificeDSI System IgnitionCont’d Fan BladesDoor Switch Combustion Air Pressure SwitchOperating Gas Valve Udas onlySwitch Flame Rollout Switch Sizes 30-125 onlyAir System Troubleshooting DisconnectVenter motor General TroubleshootingWill not start Burner willCont’d Troubleshooting cont’d

UDAP, UDAS specifications

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