Desa Service Procedure, CANADIAN MODEL RCLP375B, Propane Construction Heater, Cleaning Fan

CANADIAN MODEL RCLP375B

PROPANE CONSTRUCTION HEATER

SERVICE

PROCEDURE

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.

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

Thermal	Grounding
	Screw
Switch Wire

Terminal

Board

Solenoid

Valve

Figure 6 - Location of Motor Wires

4.Remove fan guard from rear of heater.

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 dam- age 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 mo- tor and fan into shell backwards. Note: Motor will go into shell first (see Fig- ure 8).

Rear

Mounting

Hole

First

Hole

LP-PFA/P 026

Figure 8 - Fan and Motor Turned Around

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 mount-
	ing hole.
11.	Use 1/8" hex wrench to loosen setscrew
	which holds fan to motor shaft (see Fig-
	ure 9).

Fan

Setscrew

Motor shaft

Figure 9 - Fan, Motor Shaft, and Setscrew Location

Fan

Hub

Motor Shaft

Setscrew

Figure 10 - Fan Cross Section

16.	Place setscrew on flat of shaft. Tighten
	setscrew firmly to 40-50 inch-pounds
	(5.6 N•m).
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

Mounting Bolts

Motor Mount

12.	Slip fan off motor shaft.
13.	Clean fan using soft cloth moistened
	with kerosene or solvent.

	black wire side of terminal board.
•	blue wire—to thermal switch wire
•	orange wire—to solenoid valve
•	green wire—to grounding screw on

Motor

Wires

Figure 7 - Location of Fan and Motor

LP-PFA/P 024

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).

	shell
22.	Replace side cover.
23.	Replace fan guard.

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