Thomas & Betts LDAP 1200 warranty Gas, Pressures, Cont’d

Page 12

12. Gas

 

 

 

Instructions

 

 

 

 

 

Pressures

the manual valve turned off to prevent flow to the gas valve, connect a manom-

 

 

 

 

 

1) Locate the 1/8” output pressure tap on the first valve (See FIGURE 8). With

 

(cont’d)

eter to the 1/8" pipe outlet pressure tap in the valve. NOTE: A manometer (fluid-

Check Valve Outlet

filled gauge) is recommended rather than a spring type gauge due to the difficulty

Pressure (can only

of maintaining calibration of a spring type gauge.

 

 

be done after heater

2) Open the manual valve and operate the heater. Measure the outlet pressure of

the gas valve. To measure low-stage pressure on a Size 400 unit equipped with a

is operating)

two-stage valve, disconnect the wire from the “HI” terminal on the valve. (Be

NOTE: If operating at high

sure to reconnect wire after testing.)

 

 

 

Normally when operating at sea level, adjustments should not be necessary to the

altitude, outlet pressure

factory setting(s). (For high altitude settings, see below.) If adjustment is neces-

requires adjustment. Follow

sary, remove the cap from the adjustment screw(s). Set pressure to correct

instructions below.

settings by turning the regulator screw IN (clockwise) to increase pressure. Turn

 

 

 

 

 

NOTES: If installation is

regulator screw OUT (counterclockwise) to decrease pressure.

 

3) If installing a Model LDAP 800, repeat to verify outlet pressure on second valve.

above 6000 ft (1830M), a

If installing a Model LDAP 1200, repeat to verify outlet pressure check on

high altitude pressure switch

second and third valve.

 

 

 

is required on each heat

 

 

 

Derate by Valve Outlet Pressure Adjustment for High

section (all sizes). See

Paragraph 5.

 

 

 

Altitude Operation

 

 

 

The main combustion air

Instructions for HighAltitude Derate

 

 

 

pressure switch (Sizes 800

1. Determine the required valve outlet pressure for the elevation where the heater

and 1200 only) does not need

will be operating. If unsure of the elevation, contact the local gas supplier.

to be changed for high

Valve Outlet Pressure Settings by Elevation

 

 

altitude installation.

 

 

 

Manifold Pressure Settings by Altitude for the UNITED STATES

 

FIGURE 8 - Top View of

Altitude

Natural Gas (inches w.c.)

Propane Gas (inches w.c.)

 

 

Single-Stage and

Two-Stage

Single-Stage and

Two-Stage

Valves showing Outlet

Feet

Meters

Two-Stage High Fire

Low Fire

Two-Stage High Fire

Low Fire

Pressure Tap and

 

 

0-2000

0-610

3.5

2.0

10.0

5.6

Adjustment Locations

2001-3000

611-915

3.1

1.7

8.8

5.0

 

 

 

 

 

3001-4000

916-1220

3.0

1.7

8.5

4.8

 

Single-Stage Valve

 

 

 

 

 

4001-5000

1221-1525

2.8

1.6

8.1

4.6

5001-6000

1526-1830

2.7

1.5

7.7

4.4

 

Output

1/8” Output

 

 

 

 

 

6001-7000

1831-2135

2.6

1.5

7.4

4.2

 

Adjustment

Pressure Tap

 

 

7001-8000

2136-2440

2.5

1.4

7.1

4.0

 

Screw

 

 

 

8001-9000

2441-2745

2.4

1.3

6.7

3.8

 

 

 

9001-10000

2746-3045

2.4

1.3

6.7

3.6

 

 

 

 

 

 

Inlet

 

 

 

 

 

 

 

 

 

 

 

 

Manifold

Pressure Settings by Altitude for CANADA

 

 

Pressure

 

 

 

Altitude

Natural Gas (inches w.c.)

Propane Gas (inches w.c.)

 

Tap

 

 

 

Feet

Meters

Single-Stage and

Two-Stage

Single-Stage and

Two-Stage

 

 

 

 

Two-Stage High Fire

Low Fire

Two-Stage High Fire

Low Fire

 

 

 

 

 

 

 

 

Two -Stage Valve (optional

 

 

0-2000

0-610

3.5

2.0

10.0

5.6

 

 

 

2001-4500

611-1373

2.8

1.6

8.1

4.6

 

on Model LDAP 400 only)

 

 

 

 

 

2. Locate the 1/8” output pressure tap on the first valve (See FIGURE 8). Turn

 

Adjust High

Adjust Low

 

 

 

 

 

the knob on the top of the valve to “OFF”. Connect a manometer to the 1/8"

 

Pressure

 

 

 

Pressure

 

 

pipe outlet pressure tap in the valve. Use a water column manometer that is

 

Output

 

 

 

Output

 

 

readable to the nearest tenth of an inch.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. Single-Stage and Two-Stage High Fire - Turn the knob on the top of the

 

 

 

 

 

valve to “ON”. Remove the cap from the pressure adjusting screw and adjust

 

 

 

 

 

the gas train pressure to the pressure selected from the table above. Adjust

 

Inlet

 

 

 

pressure by turning the regulator screw IN (clockwise) to increase pressure or

 

 

 

 

OUT (counterclockwise) to decrease pressure.

 

 

 

Pressure

 

 

 

 

 

 

1/8” Output

 

 

Two-Stage Low Fire - Disconnect the wire from the “HI” terminal on the gas

 

Tap

 

 

 

 

 

valve and check the low fire pressure. Turn the regulator screw to adjust the low

 

 

Pressure

 

 

 

 

 

 

fire outlet pressure to the “Low Fire” pressure selected from the table. Re-

 

 

Tap

 

 

 

 

 

 

connect the wire to the gas valve.

 

 

 

 

 

 

 

 

 

 

 

 

Form RZ-NA-I-LDAP, P/N 207733 (Rev

 

2), Page 12

 

 

 

 

 

Page 11 Page 13
Image 12
Page 11 Page 13
Contents Table of Contents Reznor Model LdapGeneral Installation Codes WarrantyHazard Levels of Warnings in this Manual Switches Uncrating and Preparation High Altitude OperationTechnical Data DimensionsModel One DownflowModel LDAP800 and Model LDAP1200 Clearances Combustion AirClearances inches/mm Heater Location Mounting Height Heater Throw All ModelsThrow feet and meters 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 SupplyGas PressuresCont’d Supply Wiring Burners Electrical Supply ConnectionsDisconnect Switch Electrical Supply and Connections cont’dThermostat and Connections 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 Check Installation and Startup Check the installation prior to startup Heater StartupOperating Instructions Operating Sequence 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

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