Thomas & Betts UDAS, UDAP Startup cont’d, Maintenance Schedule, Use only factory-authorized parts

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24.Startup (cont’d)

οTurn the unit off and on, pausing two minutes between each cycle. Observe for smooth ignition.

οPlace the "Owner's Envelope" containing the Limited Warranty, this booklet, and any control or optional information in an accessible location near the heater. Follow the instructions on the envelope.

DANGER: The gas burner in this gas-fired equipment is designed and equipped to provide safe controlled complete combustion. However, if the installation does not permit the burner to receive the proper supply of combustion air, complete combustion may not occur. The result is incomplete combustion which produces carbon monoxide, a poisonous gas that can cause death. Safe operation of indirect-fired gas burning equipment requires a properly operating vent system that vents all flue products to the outside atmosphere. FAILURE TO PROVIDE PROPER VENTING WILL RESULT IN A HEALTH HAZARD WHICH COULD CAUSE SERIOUS PERSONAL INJURY OR DEATH.

Always comply with the combustion air requirements in the installation codes and in Paragraph

9.Combustion air at the burner should be regulated only by manufacturer-provided equipment.

NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO ANY HEATER. Model UDAP units installed in a confined space must be supplied with air for combustion as required by Code and in Paragraph 9 of this heater installation manual.

MAINTAIN THE VENT OR VENT/COMBUSTION AIR SYSTEM IN STRUCTURALLY SOUND AND PROPER OPERATING CONDITION.

MAINTENANCE AND SERVICE

25.Maintenance Schedule

NOTE: If replacement parts are required,

use only factory-authorized parts.

WARNING: If you turn off the power supply, turn off the gas. See Hazard Levels, page 2.

The material contained in the MAINTENANCE AND SERVICE Section of this manual is designed to aid a qualified service person in maintaining and servicing this equipment. This heater will operate with a minimum of maintenance. To en- sure long life and satisfactory performance, a heater that is operated under normal conditions should be inspected and cleaned at the start of each heating season. If the heater is operating in an area where an unusual amount of dust or soot or other impurities are present in the air, more frequent maintenance is recommended.

When any service is completed, be careful to reassemble correctly to ensure that no unsafe conditions are created. When re-lighting, always follow the lighting instructions on the heater.

Maintenance Schedule - The following procedures should be carried out at least annually (See FIGURE 18 and Paragraphs 26-39.):

•Clean all dirt, lint, and grease from the combustion air opening (UDAP) and venter assembly.

•Clean all dirt, lint, and grease from the fan blade, fan guard, and motor.

•Check the heat exchanger both internally and externally.

•Check the burner for scale, dust, or lint accumulation. Clean if needed.

•Check the vent or vent/combustion air system for soundness. Clean openings. Replace any parts that do not appear sound.

•Check the wiring for any damaged wire. Replace damaged wiring. (See Para- graph 14 for replacement wiring requirements.)

Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 28

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Contents Table of Contents Series Fan-Type Unit HeatersInstallation Codes GeneralHazard Levels of Warnings in this Manual Venting Manual by ModelWarranty Uncrating and Preparation Massachusetts RequirementDimensions SizeModel Udas Separated Combustion Fan Technical Data Size 100 125Instructions for Changing Pressure Switch Pressure SwitchHigh Altitude Operation ClearancesCombustion Air applies to Model Udap and Model Model Udap and Model UDAP-CVHeater Throw Unit Heater LocationLocation Recommendations Unit Heater Location cont’d Hanging the HeaterModel Udap Size 100 125 150 175 225 250 300 350 400 Model Udas Size 100 125 150 175 225 250 300 350 400Connectors are Recommended maximum hanger rod length is 6 feet 1.8MBe sure Threaded swivel Locked toSizing Gas Supply Line Gas Piping and PressuresGas Connection Size Instructions Manifold Pressure Settings by Altitude for Canada Gas Piping and Pressures cont’dInstructions for High Altitude Derate 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 Door Switch Model Udas only Ignition System Dip SwitchNormal Heat Cycle Operating Sequence 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 FigureBurner Maintenance cont’d Inspect and Clean the Burner Re-Install the BurnerInstructions to Re-Install the Burner Refer to Figure Burner OrificeDSI Ignition SystemCont’d Fan BladesCombustion Air Pressure Switch Door SwitchOperating Gas Valve Udas onlyFlame Rollout Switch Sizes 30-125 only SwitchAir System Troubleshooting DisconnectGeneral Troubleshooting Venter motorWill not start 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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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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