Desa NTH70, NTH150, NTH50, NTH100 Specifications, Wiring Diagrams, Service Procedures, Continued

OWNER’S MANUAL

SERVICE

PROCEDURES

Continued

Fan

IMPORTANT: Remove fan from motor shaft before removing motor from heater. The weight of the motor resting on the fan could damage the fan pitch.

1.Remove upper shell (see page 8).

2.Use 1/8" allen wrench to loosen set- screw which holds fan to motor shaft.

3.Slip fan off motor shaft.

4.Clean fan using a soft cloth moistened with kerosene or solvent.

5.Dry fan thoroughly.

6.Replace fan on motor shaft. Place fan hub flush with end of motor shaft (see Figure 30).

7.Place setscrew on flat of shaft. Tighten setscrew firmly (40-50 inch-pounds/ 4.5-5.6 n-m).

8.Replace fan guard and upper shell.

Fan

Setscrew

SPECIFICATIONS

Output Rating (Btu/Hr)	35,000	50,000	70,000	100,000	150,000
Fuel	Use Only Kerosene or No. 1 Fuel Oil
Fuel Tank Capacity
(U.S. Gal./Liters)	3.0/11.4	5.0/18.9	5.0/18.9	9.0/34	13.5/51.1
Fuel Consumption
(Gal. Per Hr./
Liters Per Hr.)	.26/1.0	.37/1.40	.49/1.85	.70/2.7	1.1/4.1
Electric Requirements	230 V/50 Hz (Same All Models)
Amperage (Normal Run)	.8	1.0	1.0	1.2	1.2
Hot Air Output
(CFM/CMM)	140/4	205/5.8	225/6.4	425/12	500/14.2
RPM	1425	2850	2850	2850	2850

WIRING DIAGRAMS
			ON/Off Switch					Ignitor
	B	Black	1	1a	Black	D
									Spark
Reset	Flame-Out							Orange	Plug
							Red
Button	Control									Black
	R			Red		C	Red	Motor
						Terminal		Green-Yellow
						Board
				White		B	White
										Brown
						A	White		RFI Filter	Blue
	Blue			White						230 V~/50 Hz
				Photocell						Green-Yellow

Motor	Figure 31 - Wiring Diagram
Shaft

Figure 29 - Fan, Motor Shaft, and Setscrew

Location

Fan

Flush

Motor

Shaft

Setscrew

Figure 30 - Fan Cross Section

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