Desa NTH50-2 Air Output, Air Intake, And Lint Filters, Pump Pressure Adjustment, Continued

PORTABLE FORCED AIR HEATERS

SERVICE

PROCEDURES

Continued

AIR OUTPUT, AIR INTAKE, AND LINT FILTERS

1.Remove upper shell (see page 8).

2.Remove filter end cover screws using 5/16" nut-driver.

3.Remove filter end cover.

4.Replace air output and lint filters.

5.Wash or replace air intake filter (see Preventative Maintenance Schedule, page 6).

6.Replace filter end cover.

7.Replace fan guard and upper shell.

IMPORTANT: Do not oil filters

PUMP PRESSURE

ADJUSTMENT

1.Remove pressure gauge plug and plas- tic cap (35/50/70,000 Btu/Hr Models only) from filter end cover.

2.Install accessory pressure gauge (part number HA1180).

3.Start heater (see Operation, page 5). Allow motor to reach full speed.

4.Adjust pressure. Turn relief valve to right to increase pressure. Turn relief valve to left to decrease pressure. See specifications below for correct pres- sure for each model.

5, Remove pressure gauge. Replace pres- sure gauge plug and plastic cap (35/50/ 70,000 Btu/Hr Models only) in filter end cover.

Air Intake Filter

Filter End	Fan Guard
Cover

Lint Filter

Air Output

Filter

Figure 13 - Air Output, Air Intake, and Lint Filters, 35/50/70,000 Btu/Hr Models

Air Intake Filter

Filter End	Fan Guard
Cover

Lint Filter

Air Output

Filter

Figure 14 - Air Output, Air Intake, and Lint Filters, 100/150,000 Btu/Hr Models

Pressure
Gauge		Pump
Plug
		Pressure
Relief
	Model	(PSI/Bar)
Valve	NTH35-2	2.9/0.200
	NTH50-2	3.9/0.270
	NTH70-2	4.9/0.338
	NTH100-2	4.9/0.338
	NTH150-2	5.5/0.380
Plastic Cap
Figure 15 - Pressure Gauge Plug and	Pressure
Plastic Cap Removal	Gauge
(35/50/70,000 Btu/Hr Models Shown)

Figure 16 - Adjusting Pump Pressure

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