Desa R70D Service Procedures, Upper Shell Removal, Fan, AIR OUTPUT, AIR INTAKE, and Lint Filters

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OWNER’S MANUAL

SERVICE

PROCEDURES

WARNING: Never service heater while it is plugged in, op- erating, or hot. Severe burns and electrical shock can occur.

UPPER SHELL REMOVAL

1.Remove screws along each side of heater using 5/16" nut-driver. These screws attach upper and lower shells together.

2.Lift upper shell off.

3.Remove fan guard.

Upper Shell

Fan Guard

Figure 3 - Upper Shell Removal

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 Upper Shell Removal).

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 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 4).

7.Place setscrew on flat of shaft. Tighten setscrew firmly (40-50 inch-pounds).

8.Replace fan guard and upper shell.

Fan

Motor

Flush

Motor

Shaft

Setscrew

Figure 4 - Fan Cross Section

AIR OUTPUT, AIR INTAKE, AND LINT FILTERS

1.Remove upper shell (see Upper Shell Removal).

2.Remove filter end cover screws using 5/16" nut-driver.

3.Remove filter end cover.

4.Replace air output and lint filters.

5.Wash or replace air intake filter (see Preventative Maintenance Schedule, page 5).

6.Replace filter end cover.

7.Replace fan guard and upper shell. IMPORTANT: Do not oil filters.

Air Intake Filter

Filter End Cover

Fan Guard

Lint Filter

Air Output Filter

Figure 5 - Air Output, Air Intake, and Lint Filters

PUMP PRESSURE

ADJUSTMENT

1.Remove pressure gauge plug from filter end cover.

2.Install accessory pressure gauge (part number HA1180).

3.Start heater (see Operation, page 4). Allow motor to reach full speed.

4.Using a flat blade screwdriver, adjust pressure. Turn relief valve to right to increase the pressure. Turn relief valve to left to decrease the pressure. Set pump pressure at 4.7 PSI.

5.Stop heater (see Operation, page 4).

6.Remove pressure gauge. Replace pres- sure gauge plug in filter end cover.

Pressure

Gauge

Plug

Relief Valve

Figure 6 - Pressure Gauge Plug Removal

Pressure

Gauge

Figure 7 - Adjusting Pump Pressure

Continued

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Contents Portable Forced AIR Heater Portable Forced AIR Heaters Safety InformationTheory of Operation Product Identification UnpackingTo Stop Heater To Reset HeaterFuels Ventilation Operation To Start HeaterCorrosive fumes How Often How ToFault Condition Possible Cause Remedy TroubleshootingFAN Service ProceduresPump Pressure Adjustment Upper Shell RemovalIgnitor Ignition Control AssemblyProcedure for Replacing Fuse Fuel FilterFuel and AIR Line Replacement Proper Routing Nozzle AssemblyParts not Under Warranty Replacement PartsTechnical Service Parts Under WarrantyIgnition Control SpecificationsWiring Diagram AccessoriesR70D B70D Illustrated Parts BreakdownNumber Description QTY Parts ListWarranty Service Limited WarrantyRepair Service

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