Desa RJ45, RJ70 Service Procedures, Upper Shell Removal, Air Output, Air Intake, And Lint Filters

RJ45 And RJ70

PORTABLE FORCED AIR HEATERS

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 4 - 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 above).

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 5).

7.Place setscrew on flat of shaft. Tighten setscrew firmly (7200-8900 grams/centimeter).

8.Replace fan guard and upper shell.

Fan

Motor

Flush

Motor

Shaft

Setscrew

Figure 5 - 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 6 - 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 5). Al- low 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 as follows:

RJ45: 0.22 kg/cm2 at 50 Hz.

0.24kg/cm2 at 60 Hz. RJ70: 0.35 kg/cm2 at 50 Hz.

0.38kg/cm2 at 60 Hz.

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

Pressure
Gauge
Plug	Relief Valve

Figure 7 - Pressure Gauge Plug Removal

Pressure

Gauge

Figure 8 - Adjusting Pump Pressure

8 104950