Thomas & Betts UDAS, UDAP dimensions Gas Valve Fan Motor, Fault Modes cont’d Lockout

Page 22

20.Ignition System (cont’d)

Fault Modes (cont’d)

Lockout

21.Gas Valve

22.Fan Motor

If the gas valve was sensed as closed when it should be open, and has not de- energized after the venter motor was shutoff for 15 seconds, then the venter motor is re-energized to vent the unburned gas.

Soft Lockout - The control shall not initiate a call for heat or call for continuous fan while in lockout. The control will still respond to an open limit and undesired flame. Lockout shall automatically reset after one hour. Lockout may be manually reset by removing power from the control for more than one second or removing the thermostat call for heat for more than one and less than 20 seconds.

Hard Lockout - If the control detects a fault on the control board, the status LED will be de-energized, and the control will lockout as long as the fault remains. A hard lockout will automatically reset if the hardware fault clears.

Power Interruption - During a momentary power interruption or at voltage levels below the minimum operating voltage (line voltage or low voltage) the system will self-recover without lockout when voltage returns to the operating range.

Power interruptions of less than 80mS shall not cause the control to change operat- ing states. Power interruptions greater than 80mS may cause the control to inter- rupt the current operating cycle and re-start.

The main operating gas valve is powered by the 24-volt control circuit through the thermostat and safety controls. The main control valve is of the diaphragm type providing regulated gas flow preset at the factory. (For location, see FIGURE 18, page 31.)

WARNING: The operating valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale before connecting the unit to ensure positive closure. See Hazard Levels, page 2.

The fan motor is equipped with thermal overload protection of the automatic reset type. Should the motor refuse to run, it may be because of improper current char- acteristics. Make certain that the correct voltage is available at the motor.

NOTE: If the unit is equipped with an optional totally enclosed motor or optional voltage, the horsepower may be larger than the standard motor. Refer to the motor nameplate to verify horsepower.

Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 22

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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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