Thomas & Betts LDAP 1200 warranty Ignition System cont’d

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20.Ignition System (cont’d)

Abnormal Heat Cycle Functions (cont’d)

Continuous Fan Operation

remain energized for an inter-purge period of 10 seconds. The spark and gas valve are then re-energized, and the control initiates another trial for ignition.

If flame is not established on the second trial for ignition, the control de-energizes the gas valve, energizes the fan motor on heat speed, and the heat section venter motor and main venter motor remain energized. The fan motor is shut off after the longest selectable fan delay time (160 seconds). When the fan motor de-energizes, the spark and gas valve are re-energized and the control initiates another trial for ignition. (This fan delay is a self- healing feature for an open auxiliary limit switch).

If flame is not established on the third trial for ignition period, the control de-energizes the gas valve, and the heat section venter motor and main venter motor remain energized for an inter-purge period of 10 seconds. The control then re-energizes the gas valve and spark and initiates another trial for ignition.

If flame is not established on the fourth trial for ignition (initial try plus 3 re-tries), the control de-energizes the gas valve and goes into lockout. The control goes to one flash on the green LED to indicate ignition failure lockout.

Limit and High Limit Switch Operation - The high limit and limit switch are ignored unless a call for heat is present (W energized). If the high limit or limit switch are open and a call for heat is present, the control de-energizes the gas valve and turns the fan motor on heat speed and runs the heat section venter motor and the main venter motor.

When the switch re-closes or the call for heat is lost, the control runs the heat section venter motor and main venter motor through post purge and runs the fan motor through the selected fan off delay. The control will return to normal operation after fan off delay is completed.

Heat Section Pressure Switch (all sizes) and Main Combustion Air Pressure Switch (Sizes 800 and 1200) - If the heat section pressure switch or main combustion air pres- sure switch opens before the trial for ignition period, the heat section venter motor and main venter motor will run through the heat section pressure switch and main combus- tion air pressure switch recognition delay (2 seconds), the gas valve will be de-energized, and the heat section venter motor and main venter motor will run through the postpurge time. The control will re-start the heat cycle at the heat section pressure switch and main combustion air pressure switch proving state if the call for heat still exists.

Heat section pressure switch or main combustion air pressure switch opening for less than 2 seconds during the trial for ignition period shall not interrupt the heat cycle. (Gas valve will de-energize while the heat section pressure switch and main combustion air pressure switch is open.)

If the heat section pressure switch or main combustion air pressure switch opens after a successful ignition, the control will de-energize the gas valve. If flame is lost before the end of the 2 second pressure switch recognition delay, the control will respond to the loss of flame. If the heat section pressure switch and main combustion air pressure switch remains open for 2 seconds and the flame remains, the control de-energizes the gas valve, the heat section venter motor and main venter motor runs through postpurge, and the fan motor runs on heat speed through the selected fan off delay. When the fan off delay is over, the fan motor is de-energized, and a heat cycle is begun if the call for heat still exists.

When the thermostat calls for continuous fan (G) without a call for heat, the fan motor is energized after a .25 second delay. NOTE: This brief on delay is to allow the “G” termi- nal to energize slightly before “Y” and an external changeover relay to switch from “G” to “W” without causing momentary glitches in the fan motor output. The fan remains energized as long as the call for fan remains without a call for heat.

If a call for heat (W) occurs during continuous fan, the fan will de-energize. A call for fan is ignored while in lockout.

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 20

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Contents Table of Contents Reznor Model LdapHazard Levels of Warnings in this Manual General Installation CodesWarranty Switches Uncrating and Preparation High Altitude OperationTechnical Data DimensionsModel One DownflowModel LDAP800 and Model LDAP1200 Clearances inches/mm ClearancesCombustion Air Throw feet and meters Heater LocationMounting Height Heater Throw All Models Hanging or Mounting the Heater and Installing Louvers Heater Location cont’dSound Data Location RecommendationsWall Mounting Guidelines for Wall Mounting Model Ldap HeatersInstalling Heater and Louvers cont’d Installing LouversGas Piping and Pressures Sizing Gas SupplyValve Outlet or Orifice Pressure Setting Gas Connection SizeHorizontal Supply Vertical SupplyCont’d GasPressures Supply Wiring Burners Electrical Supply ConnectionsThermostat and Connections Disconnect SwitchElectrical Supply and Connections cont’d CL7 Thermostat and Connections cont’d Multiple Heater Control Option CL31 and Option CL32Connections for Model Ldap 1200 with Option CL1, CL2, CL3, CL7, or CL18Combustion Air Proving Pressure Switches Pressure Switch SettingsLimit Control High Limit ControlIgnition System Normal Heat Cycle Operating Sequence Abnormal Heat Cycle FunctionsIgnition System cont’d Fault Modes Lockout Fan Motor WiringGas Valves Fan MotorsWiring Diagrams Wiring DiagramWhite = Neutral Black = High Heat Speed Wiring Diagrams cont’d Above control wiring isAbove control wiring is Line VoltageVenting Venting RequirementsType of Vent Pipe VerticalJoints and Sealing Venting cont’d Venting Requirements cont’dJoints and Sealing cont’d Double Vent Wall Pipe With Sealant Pipe RunWall Ft 1M Minimum 305 mm Operating Instructions Operating Sequence Check Installation and StartupCheck the installation prior to startup Heater Startup Check installation after startup Vent System Testing ProcedureMaintenance Schedule DimensionsWay Discharge Louvers, Option CD32 Nozzles NozzleHeat Exchanger Maintenance Burner Maintenance Location of ControlsBurner Maintenance cont’d Inspect and Clean the BurnerRe-Install the Burner Instructions to Re-Install the Burner Refer to FigureBurner Orifices Heat Section Venter Motor and WheelIgnitor Flame Sensor MeasurementHeat Section Venter Motor and Wheel cont’d Main Venter Motor and Wheel Models 800 and 1200 onlyFan Blades GuardsCombustion Air Pressure Switches Operating Gas ValvesTroubleshooting Vent SystemGeneral Troubleshooting Problem Probablecause RemedyGeneral Troubleshooting cont’d No heat Heater

LDAP 1200 specifications

The Thomas & Betts LDAP 1200 is a cutting-edge lighting control system designed specifically to enhance energy efficiency, reduce operational costs, and promote flexibility in various lighting applications. Ideal for commercial and industrial environments, the LDAP 1200 integrates advanced technologies to create a robust solution for managing lighting systems.

One of the standout features of the LDAP 1200 is its intelligent control capabilities. With occupancy sensors and daylight harvesting technology, the system can automatically adjust lighting levels based on the presence of people and the amount of natural light available. This results not only in energy savings but also in improved occupant comfort.

The LDAP 1200 is designed for easy installation and configuration. Its modular design allows for scalability, making it suitable for both small spaces and large commercial projects. The system supports a variety of lighting types, including LED, fluorescent, and incandescent, ensuring compatibility with existing infrastructure.

User-friendly interfaces are another key characteristic of the LDAP 1200. Operating through a centralized control panel or a mobile app, users can easily monitor and adjust lighting settings, schedule operations, and receive real-time feedback. This level of control empowers facility managers to respond quickly to changing needs and optimize lighting performance.

In terms of energy management, the LDAP 1200 integrates seamlessly with building management systems (BMS), enabling complex scheduling and reporting functions. The system collects data on energy usage, helping organizations to track performance and implement strategies to further reduce consumption.

Durability and reliability are paramount in industrial applications, and the LDAP 1200 does not disappoint. Constructed with high-quality materials, the system is designed to withstand everyday wear and tear. Its robust architecture ensures that it will function effectively in various environmental conditions.

In summary, the Thomas & Betts LDAP 1200 is a versatile and efficient lighting control solution that plays a critical role in enhancing energy efficiency, reducing costs, and improving user experience. With its intelligent control features, user-friendly interfaces, and compatibility with various lighting types, the LDAP 1200 represents a significant advancement in lighting technology, making it a smart choice for modern facilities seeking to optimize their lighting systems.
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