Desa D44N, D20N Fan, Ignition Control Assembly, Remove Old Assembly, Installing the New Assembly

Page 13

OWNER’S MANUAL

SERVICE

PROCEDURES

Continued

FAN

IMPORTANT: Remove fan from motor shaft before removing motor from heater. The weight of the motor resting on the fan could damage the fan pitch.

1.Remove upper shell (see page 8).

2.Use 1/8" allen wrench to loosen set- screw which holds fan to motor shaft.

3.Slip fan off motor shaft.

4.Clean fan using a soft cloth moistened with kerosene or solvent.

5.Dry fan thoroughly.

6.Replace fan on motor shaft. Place fan hub flush with end of motor shaft (see Figure 28).

7.Place setscrew on flat of shaft. Tighten setscrew firmly (40-50 inch-pounds/ 4.5-5.6 n-m).

8.Replace fan guard and upper shell.

Fan

Setscrew

Motor

Shaft

Figure 27 - Fan, Motor Shaft, and Setscrew Location

Fan

Flush

Motor

Shaft

Setscrew

IGNITION CONTROL

ASSEMBLY

WARNING: Unplug heater before servicing.

Remove Old Assembly

1.Using the 5/16" nut driver or socket wrench, remove the four side cover screws (see Figure 29).

2.Disconnect the nine wires from the ignition control assembly.

3.Using needle nose pliers, squeeze the tab on the printed circuit board support and lift up on the edge of the ignition control assembly (see Figure 30). Repeat this for the other four printed circuit board sup- ports then remove the assembly.

Side

Cover

Figure 29 - Removing Cover

Side Cover

Ignition

 

Control

Printed Circuit

Assembly

Board Supports (5)

Figure 30 - Removing Circuit Board

Installing the New Assembly

CAUTION: Ignition control assembly contains electrostatic components. Handle the assem- bly by the edges of the printed circuit board. Do not touch any of the quick connect terminals or electronic components.

1.Align the five holes in the assembly with the five printed circuit board sup- ports in the side cover.

2.Holding the assembly by the edges of the printed circuit board, apply down- ward pressure until all five tabs on the printed circuit board supports springlock into place. Pull up on assembly to verify this (see Figure 31).

3.Connect the nine wire leads to the ignition control assembly as shown in the wiring diagram on page 21.

CAUTION: Double check connections. Connecting igni- tion control assembly wrong could result in damage to the ignition control assembly and/ or other components in the heater assembly.

4.Using the 5/16" nut driver or socket wrench reinstall side cover to heater. Tighten screws until snug. Do not over torque!

UnacceptableAcceptable

Figure 31 - Attaching Circuit Board to Tabs

Figure 28 - Fan Cross Section

105843

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Contents Portable Forced AIR Heaters D20N, D30N and D44N Models Portable Forced AIR Heaters Safety InformationFuels Product Identification UnpackingVentilation AssemblyTools Needed Extension Cord Wire Size Requirements To Reset HeaterTheory Operation To Start HeaterTroubleshooting Preventative MaintenanceStoring TRANSPORTING, or Shipping ScheduleWater in fuel tank Drain and flush fuel tank with clean Obstruction in nozzle assemblyON/OFF switch light remains on Filter Photocell and ignition control assemblyUpper Shell Removal Service ProceduresFuel Filter D20N ModelIgnitor Disconnecting Ignitor Wires from Ignition Control AssemblyAIR OUTPUT, AIR INTAKE, and Lint Filters Pump Pressure AdjustmentFuel and AIR Line Replacement Proper Routing Nozzle AssemblyPump Rotor Procedure if Rotor is BindingRemove Old Assembly Ignition Control AssemblyInstalling the New Assembly FANIllustrated Parts Breakdown Motor and Pump AssemblyD20N Model Number Description QTY Parts ListD30N Model KEY Part Number Description QTY D44N Model Desired part D44N ModelNTC-3C Wheels and HandlesAccessories SpecificationsWiring Diagram EC Conformity Declaration EC Conformity Declaration105843 Warranty Information

D30N, D44N, D20N specifications

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