Thomas & Betts LDAP 1200 Normal Heat Cycle Operating Sequence, Abnormal Heat Cycle Functions

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Normal Heat

Cycle Operating

Sequence

NOTE: All LED Flash Codes are on page 38.

Switch Settng Chart for Fan

OFFDelay (See SW1 on W.D.)

TIME SW1 SW2

90 sec

OFF

ON

120 sec

OFF

OFF

160 sec

ON

OFF

45 sec

ON

ON

Abnormal Heat Cycle Functions

1)Call for Heat - The thermostat calls for heat by energizing the “W” terminal. The control checks to see that the limit and high limit switches are closed and the heat section pressure switch is open and the main combustion air pressure switch (Sizes 800 and 1200) is open. If the limit or high limit switch is open, the control responds as defined in the “Abnormal Heat Cycle, Limit Switch Operation”. If the heat section pressure switch or main combustion air pressure switch are closed, the control will do four flashes on the green LED and wait indefinitely for the heat section pressure switch or main combustion air pressure switch to open. If the heat section pressure switch and main combustion air pressure switch are open, the control proceeds to prepurge.

2)Prepurge - The control energizes the heat section venter motor and main venter motor (Sizes 800 and 1200) and waits for the heat section pressure switch and main combustion air pressure switch to close. If the heat section pressure switch or main combustion air pressure switch does not close within 30 seconds of the heat section venter motor and main venter motor energizing, the control will do two flashes on the green LED. The control will leave the heat section venter motor and main venter motor energized indefi- nitely as long as the call for heat remains and the heat section pressure switch or main combustion air pressure switch is open.

When the heat section pressure switch and main combustion air pressure switch are proven closed, the control begins the prepurge time. If flame is present any time while in prepurge, the prepurge time is restarted. If flame is present long enough to cause lockout, the con- trol responds as defined in “Fault Modes, Undesired Flame”.

The control runs the heat section venter motor and main venter motor for a 20 second prepurge time, then proceeds to the ignition trial period.

3)Ignition Trial Period - The control energizes the spark and main gas valve. The venter remains energized. If flame is sensed during the first 16 seconds, the spark is de-ener- gized and the control proceeds to heat fan on delay. If flame has not been sensed during the first 16 seconds, the control de-energizes the spark output and keeps the gas valve energized for an additional one second flame proving period. If flame is not present after the flame proving period, the control de-energizes the gas valve and proceeds with igni- tion re-tries as specified in “Abnormal Heat Cycle, Ignition Re-try”. If flame is present, the control proceeds to the fan on delay.

4)Fan On Delay - The control waits for 30 seconds from the time the gas valve opened and then energizes the fan motor. The gas valve, heat section venter motor, and main venter motor remain energized. The control proceeds to steady heat mode.

5)Steady Heat - Control inputs are continuously monitored to ensure limit, high limit, heat section pressure switch, and main combustion air pressure switch are closed, flame is established, and the thermostat call for heat remains. When the thermostat call for heat is removed, the control de-energizes the gas valve and begins post-purge and fan off delay timing.

6)Post Purge - The heat section venter motor and main venter motor outputs remain on for a 45 second post-purge period after the thermostat is satisfied.

7)Fan Off Delay - The fan motor is de-energized after a fan off delay as selected by the dip switches. Timing begins when the thermostat is satisfied. Delay times are as in the table on the left. The factory default when shipped is 120 seconds.

Interrupted Thermostat Call for Heat - If the thermostat demand for heat is removed before the flame is recognized, the control will run the heat section venter motor and main venter motor for the post purge period and de-energize all outputs.

If the thermostat demand for heat is removed after successful ignition, the control will de-energize the gas valve, run the heat section venter motor and main venter motor through post purge, and run the fan motor on heat speed for the selected delay off time.

Ignition Retry - If flame is not established on the first trial for ignition period, the control de-energizes the gas valve and the heat section venter motor and main venter motor

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 19

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Contents Reznor Model Ldap Table of ContentsWarranty General Installation CodesHazard Levels of Warnings in this Manual Uncrating and Preparation High Altitude Operation SwitchesDownflow Technical DataDimensions Model OneModel LDAP800 and Model LDAP1200 Combustion Air ClearancesClearances inches/mm Mounting Height Heater Throw All Models Heater LocationThrow feet and meters Location Recommendations Hanging or Mounting the Heater and Installing LouversHeater Location cont’d Sound DataGuidelines for Wall Mounting Model Ldap Heaters Wall MountingSizing Gas Supply Installing Heater and Louvers cont’dInstalling Louvers Gas Piping and PressuresVertical Supply Valve Outlet or Orifice Pressure SettingGas Connection Size Horizontal SupplyPressures GasCont’d Burners Electrical Supply Connections Supply WiringElectrical Supply and Connections cont’d Disconnect SwitchThermostat and Connections CL7 CL1, CL2, CL3, CL7, or CL18 Thermostat and Connections cont’dMultiple Heater Control Option CL31 and Option CL32 Connections for Model Ldap 1200 with OptionHigh Limit Control Combustion Air Proving Pressure SwitchesPressure Switch Settings Limit ControlIgnition System Abnormal Heat Cycle Functions Normal Heat Cycle Operating SequenceIgnition System cont’d Fan Motors Fault Modes LockoutFan Motor Wiring Gas ValvesWiring Diagram Wiring DiagramsWhite = Neutral Black = High Heat Speed Above control wiring is Wiring Diagrams cont’dLine Voltage Above control wiring isVertical VentingVenting Requirements Type of Vent PipeJoints and Sealing Double Vent Wall Pipe With Sealant Pipe Run Venting cont’dVenting Requirements cont’d Joints and Sealing cont’dWall Ft 1M Minimum 305 mm Check the installation prior to startup Heater Startup Check Installation and StartupOperating Instructions Operating Sequence Vent System Testing Procedure Check installation after startupNozzle Maintenance ScheduleDimensions Way Discharge Louvers, Option CD32 NozzlesLocation of Controls Heat Exchanger Maintenance Burner MaintenanceInstructions to Re-Install the Burner Refer to Figure Burner Maintenance cont’dInspect and Clean the Burner Re-Install the BurnerMeasurement Burner OrificesHeat Section Venter Motor and Wheel Ignitor Flame SensorGuards Heat Section Venter Motor and Wheel cont’dMain Venter Motor and Wheel Models 800 and 1200 only Fan BladesOperating Gas Valves Combustion Air Pressure SwitchesVent System TroubleshootingProblem Probablecause Remedy General TroubleshootingNo heat Heater General Troubleshooting cont’d

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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