103018
7
7
For more information, visit www.desatech.com
For more information, visit www.desatech.com
SERVICE PROCEDURE
Cleaning Fan (Cont.)
8. Turn motor and fan around. Place motor and fan into shell
backwards.
Note:
Motor 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 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 fin-
ger tight. Repeat process for other mounting hole.
11. Use 1/8" hex wrench to loosen setscrew which holds fan to
motor shaft (see Figure 9).
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 surface 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 bottom of shell (see Figure 7,
page 6).
21. Connect motor wires as follows (see Figure 6, page 6):
• white wire—to terminal board.
Note:
Attach to empty connector on white wire side of ter-
minal board.
• black wire—to terminal board.
Note:
Attach to empty connector on black wire side of ter-
minal 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.
SERVICE PROCEDURE
Continued
Fan
Setscrew
Motor shaft
Figure 9 - Fan, Motor Shaft, and Setscrew Location
Figure 8 - Fan and Motor Turned Around
Rear
Mounting
Hole
First
Hole
Motor
Shaft
Setscrew
Hub
Fan
Figure 10 - Fan Cross Section
