Desa RM200T - Manual (Page 8)

8 103607
PORTABLE FORCED AIR HEATER
200,000 BTU/HR
SERVICE
PROCEDURES
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.
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, 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 6).
7. Place setscrew on flat of shaft. Tighten
setscrew firmly (40-50 inch-pounds).
8. Replace fan guard and upper shell.
Figure 5 - Upper Shell Removal
WARNING: Never service
heater while it is plugged in, op-
erating, or hot. Severe burns and
electrical shock can occur.
Upper
Shell
Screw
Fan
Setscrew
Motor
Shaft
Motor
Flush
Figure 6 - Fan Cross Section
Figure 7 - Air Output, Air Intake, and Lint
Filters
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 6).
6. Replace filter end cover.
7. Replace fan guard and upper shell.
IMPORTANT : Do not oil filters.
Fan Guard
Air Intake
Filter
Air Output
Filter
Filter End
Cover
Lint
Filter
PUMP PRESSURE
ADJUSTMENT
1. Remove pressure gauge plug from filter
end cover (see Figure 8).
2. Install accessory pressure gauge (part
number HA1180).
3. Start heater (see Operation, page 5). Al-
low motor to reach full speed.
4. Adjust pressure to 6.0 PSI. Turn relief
valve to right to increase pressure. Turn
relief valve to left to decrease pressure.
See Figure 9.
5. Stop heater. Remove pressure gauge.
Replace pressure gauge plug in filter
end cover.
Pressure
Gauge Plug
Figure 8 - Pressure Gauge Plug Removal
Figure 9 - Adjusting Pump Pressure
Relief Valve
Pressure
Gauge
Fan
Guard