Thomas & Betts LDAP 1200 warranty Gas Valves, Fan Motors, Fault Modes Lockout, Fan Motor Wiring

Page 21

Fault Modes

Lockout

21. Gas Valve(s)

•Size 400 has 1 valve.

•Size 800 has 2 valves.

•Size 1200 has 3 valves.

22 Fan Motor(s)

•Size 400 has 1 fan motor.

•Size 800 has 2 fan motors.

•Size 1200 has 3 fan motors.

Undesired Flame - If flame is sensed longer than 20 seconds while the gas valve is de- energized, the control shall energize the heat section venter motor, the main venter motor, and the fan motor on heat speed. When flame is no longer sensed, the heat section venter motor and main venter motor will run through postpurge, and the fan motor will run through the selected heat fan off delay time. The control will do a soft lockout, but will still respond to open limit and flame. The FLAME (yellow) LED shall flash rapidly when lockout is due to undesired flame.

Gas Valve Relay Fault - If the control senses the gas valve as energized for more than one second when the control is not attempting to energize the gas valve, or the gas valve is sensed as not energized when it is supposed to be energized, then the control will lockout with the green LED off. The control assumes either the contacts of the relay driving the gas valve have welded shut, or the sensing circuit has failed. The heat section venter motor is forced off to open the heat section pressure switch to stop gas flow unless flame is present.

If the gas valve was sensed as closed when it should be open, and has not de-energized after the heat section venter motor and main venter motor was shutoff for 15 seconds, then the heat section venter motor and main venter motor are 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 (Green LED - steady off) - 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 operating states. Power interruptions greater than 80mS may cause the control to interrupt the cur- rent operating cycle and re-start. Power interruption during a heat cycle may trip the manual reset high limit switch.

The main operating gas valve(s) is powered by the 24-volt control circuit through the thermostat and safety controls. The gas valve is of the diaphragm type providing regulated gas flow preset at the factory. (For location, see FIGURE 22, page 33.)

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

Each heat section in the heater has a fan motor. Each fan motor(s) is equipped with thermal overload protection of the automatic reset type. Should the motor(s) refuse to run, it may be because of improper current characteristics. Make certain that the cor- rect voltage is available at the motor(s).

Fan Motor Wiring

White = Neutral

Black = High (Heat Speed)

Blue = Medium (Destratification Speed, Factory Wired)

Red = Low (Optional Destratification Speed, Field Wired)

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 21

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Contents Reznor Model Ldap Table of ContentsGeneral Installation Codes WarrantyHazard Levels of Warnings in this Manual Uncrating and Preparation High Altitude Operation SwitchesDimensions Technical DataModel One DownflowModel LDAP800 and Model LDAP1200 Clearances Combustion AirClearances inches/mm Heater Location Mounting Height Heater Throw All ModelsThrow feet and meters Heater Location cont’d Hanging or Mounting the Heater and Installing LouversSound Data Location RecommendationsGuidelines for Wall Mounting Model Ldap Heaters Wall MountingInstalling Louvers Installing Heater and Louvers cont’dGas Piping and Pressures Sizing Gas SupplyGas Connection Size Valve Outlet or Orifice Pressure SettingHorizontal Supply Vertical SupplyGas PressuresCont’d Burners Electrical Supply Connections Supply WiringDisconnect Switch Electrical Supply and Connections cont’dThermostat and Connections CL7 Multiple Heater Control Option CL31 and Option CL32 Thermostat and Connections cont’dConnections for Model Ldap 1200 with Option CL1, CL2, CL3, CL7, or CL18Pressure Switch Settings Combustion Air Proving Pressure SwitchesLimit Control High Limit ControlIgnition System Abnormal Heat Cycle Functions Normal Heat Cycle Operating SequenceIgnition System cont’d Fan Motor Wiring Fault Modes LockoutGas Valves Fan MotorsWiring Diagram Wiring DiagramsWhite = Neutral Black = High Heat Speed Above control wiring is Wiring Diagrams cont’dLine Voltage Above control wiring isVenting Requirements VentingType of Vent Pipe VerticalJoints and Sealing Venting Requirements cont’d Venting cont’dJoints and Sealing cont’d Double Vent Wall Pipe With Sealant Pipe RunWall Ft 1M Minimum 305 mm Check Installation and Startup Check the installation prior to startup Heater StartupOperating Instructions Operating Sequence Vent System Testing Procedure Check installation after startupDimensions Maintenance ScheduleWay Discharge Louvers, Option CD32 Nozzles NozzleLocation of Controls Heat Exchanger Maintenance Burner MaintenanceInspect and Clean the Burner Burner Maintenance cont’dRe-Install the Burner Instructions to Re-Install the Burner Refer to FigureHeat Section Venter Motor and Wheel Burner OrificesIgnitor Flame Sensor MeasurementMain Venter Motor and Wheel Models 800 and 1200 only Heat Section Venter Motor and Wheel cont’dFan Blades GuardsOperating Gas Valves Combustion Air Pressure SwitchesVent System TroubleshootingProblem Probablecause Remedy General TroubleshootingNo heat Heater General Troubleshooting cont’d

LDAP 1200 specifications

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