Desa BY150ECB 150,000 Btu/Hr 110v/50 Hz - Manual (Page 7)

7 104001
OWNER’S MANUAL
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 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 (4.5-5.6 n-m/40-50
inch-pounds).
8. Replace fan guard and upper shell.
AIR OUTPUT, AIR INTAKE,
AND LINT FILTERS
1. Remove upper shell (see above).
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.
WARNING: Never service
heater while it is plugged in, op-
erating, or hot. Severe burns and
electrical shock can occur.
Figure 6 - Fan Cross Section
Figure 5 - Upper Shell Removal
Upper Shell
Fan
Guard
Fan
Setscrew
Motor
Shaft
Flush
Figure 7 - Air Output, Air Intake, and Lint
Filters
Fan Guard
Air Intake Filter
Air Output Filter
Filter End Cover
Lint Filter
Motor
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. Adjust pressure. Turn relief valve to
right to increase pressure. Turn relief
valve to left to decrease pressure. See
specifications at right for correct pres-
sure for each model.
5. Remove pressure gauge. Replace pres-
sure gauge plug in filter end cover.
Relief
Valve
Pressure
Gauge
Plug
Figure 8 - Pressure Gauge Plug Removal
Pump
Model Pressure
150,000 Btu/Hr 4.8 PSI (.331 bar)
Figure 9 - Adjusting Pump Pressure
Pressure
Gauge