Service Procedures - Desa RJ45 Owner's Manual

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.
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.
Figure 5 - Fan Cross Section
AIR OUTPUT, AIR INTAKE,
Upper Shell
AND LINT FILTERS
Fan
Guard
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.
Lint Filter
Air Output Filter
Figure 6 - Air Output, Air Intake, and Lint
Filters
Fan
Motor
Flush
Motor
Shaft
Setscrew
Air Intake Filter
Filter End Cover
Fan Guard
8
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:
2
RJ45: 0.22 kg/cm at 50 Hz.
2
0.24 kg/cm at 60 Hz.
2
RJ70: 0.35 kg/cm at 50 Hz.
2
0.38 kg/cm at 60 Hz.
5. Remove pressure gauge. Replace pres-
sure gauge plug in filter end cover.
Pressure
Gauge
Plug
Figure 7 - Pressure Gauge Plug Removal
Pressure
Gauge
Figure 8 - Adjusting Pump Pressure
Relief Valve
104950