Desa 375-F - Manual (Page 7)

www.desatech.com 116699-01B 7
Figure 8 - Fan, Motor Shaft and Setscrew
Location
Motor
Shaft
Fan
Setscrew
SERVICE PROCEDURES
WARNING: Never service
heater while it is plugged in,
connected to propane supply,
operating or hot. Severe burns
and electrical shock can occur.
CLEANING FAN
Clean fan every 500 hours of operation or as
needed.
1. Remove screws on side cover using 5/16"
nut-driver.
2. Remove side cover.
3. Detach the five motor wires from parts under
heater shell. Be sure to detach only wires
coming from motor.
The five motor wires are:
• white wire—to terminal board
• black wire—to terminal board
• blue wire—to thermal switch wire
• orange wire—to solenoid valve
• green wire—to grounding screw on shell
4. Remove fan guard from rear of heater.
5. Reach into rear of heater shell. Carefully pull
motor wires through hole in bottom of shell.
Note: Pull wires through hole one at a time.
6. Remove nuts and mounting bolts holding
motor mount to shell. Use 3/8" nut-driver and
7/16" wrench.
7. Carefully pull motor and fan out of shell.
IMPORTANT: Be careful not to damage fan.
Do not set motor and fan down with the weight
resting on fan. This could damage fan pitch.
8. Turn motor and fan around. Place motor and
fan into shell backwards. Note: Motor will go
into shell first (see Figure 7).
9. Line up rear mounting holes in shell with
first hole on each side of motor mount (see
Figure 7). Note: When holes are lined up, fan
should be outside of shell.
10. Holding mounting bolt, carefully reach
through fan blades into rear of heater. Be
careful not to damage fan pitch. Insert bolt
through motor mount and shell. With free
hand, attach nut finger tight. Repeat process
for other mounting hole.
11. Use 1/8" hex wrench to loosen setscrew which
holds fan to motor shaft (see Figure 8).
12. Slip fan off motor shaft.
13. Clean fan using soft cloth moistened with
kerosene or solvent.
14. Dry fan thoroughly.
Figure 6 - Location of Fan and Motor
Motor Wires
Mounting
Bolts
Motor
Mount
Terminal
Board
Figure 5 - Location of Motor Wires
Grounding
Screw
Thermal
Switch
Wire
Solenoid
Valve
Figure 7 - Fan and Motor Turned Around
Rear
Mounting
Hole
First
Hole