Desa BLP375A - Manual (Page 7)

7 100416
OWNER’S MANUAL
SERVICE
PROCEDURE
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.
Figure 7 - Location of Fan and Motor
WARNING: Never service
heater while it is plugged in, con-
nected to propane supply, oper-
ating, or hot. Severe burns and
electrical shock can occur.
Figure 6 - Location of Motor Wires
12. Slip fan off motor shaft.
13. Clean fan using soft cloth moistened
with kerosene or solvent.
14. Dry fan thoroughly.
15. Replace fan on motor shaft. Make sure
setscrew is touching back of flat sur-
face on motor shaft (see Figure 10).
16. Place setscrew on flat of shaft. Tighten
setscrew firmly (40-50 inch-pounds).
17. Remove two nuts and bolts securing
motor mount to shell.
18. Pull motor and fan from shell. Turn
motor and fan around. Carefully place
back in shell.
Note: Fan will go into
shell first.
19. Line up mounting holes in shell with
holes on motor mount. Replace four
bolts through shell and motor mount.
Insert bolts from outside of heater.
Tighten nuts firmly.
20. Route motor wires through hole in bot-
tom of shell (see Figure 7).
21. Connect motor wires as follows (see
Figure 6):
• white wire—to terminal board.
Note: Attach to empty connector on
white wire side of terminal board.
• black wire—to terminal board.
Note: Attach to empty connector on
black wire side of terminal board.
• blue wire—to thermal switch wire
• orange wire—to solenoid valve
• green wire—to grounding screw on shell
22. Replace side cover.
23. Replace fan guard.
Figure 9 - Fan, Motor Shaft, and Setscrew
Location
026
Figure 8 - Fan and Motor Turned Around
Rear
Mounting
Hole
First
Hole
Figure 10 - Fan Cross Section
5. Reach into rear of heater shell. Care-
fully pull motor wires through hole in
bottom of shell.
Note: Pull wires
through hole one at a time.
6. Remove nuts and mounting bolts hold-
ing 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: Mo-
tor will go into shell first (see Figure 8).
9. Line up rear mounting holes in shell
with first hole on each side of motor
mount (see Figure 8).
Note: When
holes are lined up, fan should be out-
side of shell.
10. Holding mounting bolt, carefully reach
through fan blades into rear of heater.
Be careful not to damage fan pitch. In-
sert 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 Fig-
ure 9).
Terminal
Board
Grounding Screw Thermal
Switch Wire
Solenoid Valve
Motor
Wires
Mounting
Bolts
Motor
Mount
FAN LP-PFA/P 023A
Fan
Setscrew
Motor shaft
ON LP-P
Motor
Shaft
Setscrew
Hub
Fan