Thomas & Betts LDAP 1200 warranty Uncrating and Preparation High Altitude Operation, Switches

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4.Uncrating and Preparation

5.High Altitude Operation

Pressure Switch

Instructions for Changing Heat section Pressure

NOTE: Do not change the main pressure switch located on top of a Size 800 and Size 1200 heater. It is the same for all elevations.

This heater was test operated and inspected at the factory prior to crating and was in operating condition. If the heater has incurred any damage in shipment, document the damage with the transporting agency and contact an authorized Reznor Distribu- tor. If you are an authorized Distributor, follow the FOB freight policy procedures as published by Thomas & Betts for Reznor products.

Check the rating plate for the gas specifications and electrical characteristics of the heater to be sure that they are compatible with the gas and electric supplies at the installation site.

IMPORTANT: The crate bottom should be removed after the heater is lifted. Shipping brackets are attached with cabinet screws. When removing shipping brackets, re-insert ALL screws into the cabinet.

Read this booklet and become familiar with the installation requirements of your particular heater. If you do not have knowledge of local requirements, check with the local gas company or any other local agencies who might have requirements con- cerning this installation. If the installation is above 2000 ft (610M) elevation, follow the instructions in Paragraph 5 and Paragraph 12.

Before beginning, make preparations for necessary supplies, tools, and manpower. Locate the hardware kit supplied with the heater. The plastic bag contains spring nuts, hex nuts, “U”-shape fittings, lock washers, louvers, and compression springs.

Be sure that all shipped-separate options that were ordered are at the installation site. Shipped-separate items could include a vent cap, louvers, nozzles, hanger kit, a manual shutoff valve, a thermostat, multiple heater controls, high temperature tape, and/or a high altitude kit.

If the heater is being installed at an elevation above 2000 ft (610M), the input rate will have to be derated. This is done by adjusting the outlet pressure of the gas valve and can only be done after the heater is in operation. Follow the instructions in Para- graph 12.

If the heater is being installed at an elevation above 6000 ft (1830M), the heat section pressure switch(es) will need to be changed. If ordered with the heater as Option DJ20, the pressure switch is shipped separately.

High Altitude Unit Pressure Switch(es)

Size

Qty

Start-up Cold

Equilibrium Hot

Setpoint OFF

Setpoint ON

Label

Switch

 

Differential Pressure (in. w.c.)

 

Color

Part No.

 

 

 

 

400

1

1.75 to 1.45

1.00 to 0.80

0.60

0.78

Lt. Blue

197029

800

2

1.85 to 1.55

1.05 to 0.85

0.60

0.78

Lt. Blue

197029

1200

3

2.35 to 1.85

1.50 to 0.95

0.60

0.78

Lt. Blue

197029

Switch(es)

1.In the control compartment of the first heat section, locate the pressure switch.

2.Mark and disconnect the two wires attached to the pressure switch.

3.Mark and disconnect the sensing tubes from the pressure switch.

4.Locate the two screws holding the switch mounting bracket. Remove the screws (save screws) and the pressure switch.

5.Using the same screws, install the high altitude pressure switch. Attach the sensing tubes and wires.

6.If installing a Model LDAP 400, the pressure switch change for high altitude is complete. If installing a Model LDAP 800, repeat Steps 1-5 to change the pressure switch on the second heat section. If installing a Model LDAP 1200, repeat Steps 1-5 to change the pressure switches on the second and third heat sections.

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 3

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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 SwitchesDownflow Technical DataDimensions Model OneModel LDAP800 and Model LDAP1200 Clearances Combustion AirClearances inches/mm Heater Location Mounting Height Heater Throw All ModelsThrow 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 SupplyGas PressuresCont’d Burners Electrical Supply Connections Supply WiringDisconnect Switch Electrical Supply and Connections cont’dThermostat 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 Installation and Startup Check the installation prior to startup Heater 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

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