Service Procedures. Desa Tech SBLP375AT, 375-F, BLP375AT

SERVICE PROCEDURES

Thermal

Switch

Wire

Grounding

Screw

Terminal

Board

WARNING: Never service heater while it is plugged in, connected to propane supply, operating or hot. Severe burns and electrical shock can occur.

Solenoid

Valve

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.

116699-01B

Figure 5 - Location of Motor Wires

Mounting

Bolts Motor

Mount

Motor Wires

Figure 6 - Location of Fan and Motor

Fan

Motor

Shaft

Figure 8 - Fan, Motor Shaft and Setscrew

Location www.desatech.com

Rear

Mounting

Hole

Setscrew

First

Hole

Figure 7 - Fan and Motor Turned Around

7