Thomas & Betts UDAS, UDAP dimensions Ignition, System, Cont’d, Fan Blades, Guard, Wheel

Page 32

29. Ignition

Ignitor - Refer to FIGURE 18 and locate the ignitor. Disconnect the wire; re-

move the screw and the ignitor. Clean the ignitor assembly with an emery cloth.

System

Spark gap must be maintained to 1/8". See FIGURE 20.

(cont’d)

FIGURE 20 - Ignitor

 

 

showing required

 

Ignitor

Spark Gap

1/8 inch

measurement

(3.2mm)

 

 

 

 

IMPORTANT: When re-assembling, the brown ground wire must remain attached

 

to the ignitor.

 

 

CAUTION: Due to high voltage on the spark wire and electrode,

 

do not touch when energized. See Hazard Levels, page 2.

 

 

Flame Sensor

Flame Sensor - Refer to FIGURE 18 and locate the flame sensor. Disconnect the

 

wire; remove the screw and the flame sensor. Clean with an emery cloth.

30. Fan Motor,

Remove dirt and grease from the motor, the fan guard, and blades. Use care when

cleaning the fan blades to prevent causing misalignment or imbalance. Check that

 

 

Fan Blades,

 

 

the hub of the fan blades is secure to the shaft.

 

 

and Guard

Follow these instructions for replacement of the fan guard, fan motor and/or fan

 

 

blades.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. If the heater is installed, turn off the gas and disconnect the electric power.

 

FIGURE 21 - Fan Blade

2. Open the access door and disconnect the fan motor wires, capacitor wires at the

 

Position on the Shaft

capacitor, and ground screw.

 

3. Remove the assembled parts (the fan guard, the motor and the fan blade).

 

Dimension A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4. Disassemble and replace whatever parts are needed and reas-

 

Size

inches

mm

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

semble using whatever part(s) are being replaced and the original

 

30

1

25

 

Fan

 

 

 

 

 

 

 

 

 

 

 

 

 

parts.

 

45

9/16

14

 

Blade

 

 

 

 

 

 

 

60

1-1/2

38

 

 

 

 

 

 

 

Fan

Be sure the fan blade is in the proper position on the shaft; refer to

 

75

2-1/8

54

 

 

 

 

 

 

 

Motor

the illustration and table in FIGURE 21.

 

 

 

 

 

 

 

 

 

100

2-3/8

60

 

 

 

 

 

 

 

 

Position the assembly on the heater. Attach the fan guard.

 

125

2-5/16

59

 

 

 

 

 

 

 

 

Rotate the fan blade to check for adequate clearance. If adjustment

 

150

2-3/8

60

 

 

 

 

 

 

 

 

is required, loosen the mounting screws, re-position the fan guard,

 

175

2-1/8

54

 

 

 

 

 

 

 

 

and tighten the screws. Rotate the fan blade and re-check for ad-

 

200

1-5/8

67

 

 

 

 

 

 

 

 

equate clearance. Repeat this procedure until the assembly is posi-

 

 

 

 

 

 

 

 

 

 

225,

 

 

 

 

 

 

 

 

 

tioned properly.

 

250,

2

51

 

 

 

 

 

 

 

5. Reconnect the fan motor wires according to the wiring diagram and close the

 

300

 

 

 

 

 

 

 

 

 

access panel.

 

350

1-7/8

48

 

 

 

 

 

 

 

6. Restore power to the heater and turn on the gas. Light, following the instructions

 

400

1-3/8

35

 

 

 

 

 

 

 

on the lighting instruction plate. Check for proper operation.

31. Venter Motor

Remove dirt and grease from the motor casing, the venter housing, and the venter

wheel. Venter motor bearings are permanently lubricated. Follow these instruc-

 

 

and Wheel

 

 

tions for replacement of the venter motor and wheel assembly. Keep all hardware

 

Replacement Instructions

removed to be used in re-assembling and installing the replacement parts.

 

1. Turn off the gas and disconnect the electric power.

2.Open the burner/control compartment access panel.

3.Disconnect the three venter motor wires at the DSI control, capacitor wires at the capacitor (if applicable), and ground screw (located on the control panel).

4.Sizes 30 and 45 - Disconnect the gas train and move it out of the way. Discon- nect the gas supply at the union outside of the cabinet. At the gas valve, mark and disconnect the wires. Carefully remove the burner orifice and orifice adapter locking nut. Slide the orifice adapter out through the bracket on the burner push- ing the gas train to the right. This will move the gas train out of the way.

Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 32

Page 31 Page 33
Image 32
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Contents Table of Contents Series Fan-Type Unit HeatersInstallation Codes GeneralHazard Levels of Warnings in this Manual Venting Manual by ModelWarranty Uncrating and Preparation Massachusetts RequirementDimensions SizeModel Udas Separated Combustion Fan Technical Data Size 100 125Instructions for Changing Pressure Switch Pressure SwitchHigh Altitude Operation ClearancesCombustion Air applies to Model Udap and Model Model Udap and Model UDAP-CVLocation Recommendations Unit Heater LocationHeater Throw Unit Heater Location cont’d Hanging the HeaterModel Udap Size 100 125 150 175 225 250 300 350 400 Model Udas Size 100 125 150 175 225 250 300 350 400Connectors are Recommended maximum hanger rod length is 6 feet 1.8MBe sure Threaded swivel Locked toGas Connection Size Gas Piping and PressuresSizing Gas Supply Line Instructions Manifold Pressure Settings by Altitude for Canada Gas Piping and Pressures cont’dInstructions for High Altitude Derate Two -Stage ValveHigh Altitude Capacity Changes Feet MetersBurner Electrical Supply and Connections Thermostat and ConnectionsCombustion Air Proving Switch Pressure Switch Limit Control Pressure Switch SettingsCombustion Air Proving Door Switch Model Udas only Ignition System Dip SwitchNormal Heat Cycle Operating Sequence StatusLED LightsIgnition System cont’d SW1 SW2 TimeContinuous Fan Operation Fault Modes Fault Modes cont’d Lockout Gas Valve Fan MotorWiring Diagrams Operating SequenceWiring Diagrams cont’d SW1 Operating Instructions Operating Sequence Check Installation and StartupCheck the installation prior to startup Heater Startup Check installation after startup Vent System Testing Procedure Model UdapUse only factory-authorized parts Maintenance ScheduleStartup cont’d Heat Exchanger Maintenance Burner Maintenance Burner Removal Instructions Refer to FigureBurner Maintenance cont’d Inspect and Clean the Burner Re-Install the BurnerInstructions to Re-Install the Burner Refer to Figure Burner OrificeDSI Ignition SystemCont’d Fan BladesCombustion Air Pressure Switch Door SwitchOperating Gas Valve Udas onlyFlame Rollout Switch Sizes 30-125 only SwitchAir System Troubleshooting DisconnectGeneral Troubleshooting Venter motorWill not start Burner willTroubleshooting cont’d Cont’d

UDAP, UDAS specifications

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