OWNER’S MANUAL

SERVICE

PROCEDURES

Continued

NOZZLE ASSEMBLY

1.

Remove upper shell (see page 8).

2.

Remove fan (see page 13).

3.

Remove fuel and air line hoses from nozzle

 

assembly (see Figure 17, 18, or 19).

4.

Turn nozzle assembly 1/4 turn to left

 

and pull toward motor to remove (see

Combustion

Chamber

Nozzle Adapter

Bracket

Air Line

Hose

Photocell Bracket

Nozzle/

Adapter

Assembly

Fuel Line

Hose

FUEL AND AIR LINE

REPLACEMENT AND

PROPER ROUTING

1.

Remove upper shell (see page 8).

2.

Remove side cover screws using 5/16"

 

nut driver.

3.

Remove side cover.

4.

Inspect fuel and air line hoses for cracks

 

and/or holes. If fuel line hose is damaged,

 

disconnect from nozzle adapter (see Fig-

 

ure 17, 18, or 19) and from fuel filter (see

 

Figure 20).

5.

Place plastic hex-body into vise and

 

lightly tighten.

6.

Carefully remove nozzle from the

 

nozzle adapter using 5/8" socket

 

wrench (see Figure 21).

7.

Blow compressed air through face of

 

nozzle. This will free any dirt in nozzle

 

area.

8.

Inspect nozzle seal for damage.

9.

Replace nozzle into nozzle adapter un-

 

til nozzle seats. Tighten 1/3 turn more

 

using 5/8" socket wrench 4.5 to 5.1 N-

 

m (40 to 45 in-lbs). See Figure 21.

10.

Attach nozzle assembly to burner strap.

11.

Attach fuel and airline hoses to nozzle

 

assembly. See Fuel and Airline Re-

 

placement and Proper Routing.

12.

Replace fan (see page 13).

13.

Replace fan guard and upper shell (see

 

page 8).

Combustion

Chamber

Nozzle

Adapter

Bracket

Photocell

Bracket

Nozzle/

Adapter

Assembly

Air Line

Hose

Fuel Line Hose

Figure 17 - Removing Air and Fuel Line Hoses (35/50/70,000 Btu/Hr Models Only)

Figure 18 - Removing Air and Fuel Line Hoses (100,000 Btu/Hr Model Only)

Combustion

Chamber

Nozzle Adapter

Bracket

Photocell

Bracket

Air Line

Hose Nozzle/

Adapter

Assembly

Fuel Line Hose

Figure 19 - Removing Air and Fuel Line Hoses (150,000 Btu/Hr Model Only)

Combustion

 

Chamber

Nozzle/

 

Adapter

 

Assembly

Figure 20 - Removing Nozzle/Adapter Assembly

Nozzle Face

Nozzle Seal

Nozzle

Nozzle Adapter

Air Line Fitting

Fuel Line Fitting

Figure 21 - Nozzle and Nozzle Adapter

page 8). If air line hose is damaged, dis-

connect from nozzle adapter (see Figure

17, 18, or 19) and from barb fitting on

pump end cover (see Figure 22).

5. Install new air and/or fuel line. Attach

one end of air line hose to barb fitting

on pump end cover (see Figure 22) and

the other end to nozzle adapter (see

Figure 17, 18, or 19). Attach one end

of fuel line hose to fuel filter (see page

8) and the other end to nozzle adapter

(see Figure 17, 18, or 19).

For 35/50/70,000 Btu/Hr model heat- ers, route air and fuel lines approxi- mately as shown in Figure 17.

Note: Hoses are not to be touching pho- tocell bracket.

For 100,000 Btu/Hr model heater, route air and fuel lines approximately as shown in Figure 18.

Note: Hoses are not to be touching pho- tocell bracket.

For 150,000 Btu/Hr model heater, route air and fuel lines approximately as shown in Figure 19.

Note: Hoses are not to be touching pho- tocell bracket

6.Replace side cover.

7.Replace upper shell and fan guard (see page 8).

Pump End Cover

Barb Fitting

Air Hose

Figure 22 - Air Hose to Barb FItting

Continued

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Page 10 Page 12
Page 11
Image 11
Desa NTH35-2, NTH50-2, NTH100-2, NTH150-2, NTH70-2 owner manual Nozzle Assembly, Fuel and AIR Line Replacement Proper Routing
Page 10 Page 12

NTH35-2, NTH70-2, NTH50-2, NTH100-2, NTH150-2 specifications

Desa NTH series includes advanced models like NTH150-2, NTH70-2, NTH50-2, NTH100-2, and NTH35-2. Each of these models is designed to cater to diverse needs in heating, ventilation, and air conditioning systems, ensuring optimal performance and energy efficiency.

The NTH150-2 is a powerful unit boasting an output capacity of 150,000 BTU. It features a dual-stage heating system, allowing for rapid temperature changes while maintaining energy efficiency. This model is equipped with advanced sensor technology that automatically adjusts the heating output based on room conditions, creating a comfortable indoor environment. Additionally, its robust build ensures durability and longevity.

Next in line is the NTH70-2, a medium-capacity heater suitable for residential settings. This model focuses on user-friendliness with an intuitive digital control panel, offering precise temperature settings and timer functions. The NTH70-2 is also designed with an eco-mode feature, significantly reducing energy consumption while still delivering consistent heating performance.

The NTH50-2 is designed for smaller spaces, providing an output of 50,000 BTU. This model emphasizes portability with a compact design and lightweight construction. It includes safety features like overheat protection and automatic shut-off, making it an excellent choice for individual rooms or smaller apartments. Its noise-reduction technology also ensures quiet operation, enhancing user comfort.

The NTH100-2 strikes a balance between capacity and efficiency, making it a versatile option for various applications. This model incorporates modern inverter technology, enabling it to adjust its power usage based on demand. This results in lower energy bills without compromising the heating experience. The NTH100-2 is also equipped with Wi-Fi connectivity, allowing users to control their heating system remotely via a smartphone app.

Finally, the NTH35-2 serves as an energy-efficient solution for extremely small spaces or as a supplemental heating source. It features low-energy heating technology, which ensures that operational costs remain minimal. This unit is praised for its easy installation and maintenance, making it an ideal choice for those looking for practicality without sacrificing performance.

Overall, the Desa NTH series exemplifies a commitment to innovative heating solutions, blending advanced technology, user-friendly designs, and energy efficiency to meet a wide range of indoor climate needs.
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