OWNER’S MANUAL

INSTALLATION

(Continued)

CONNECTING TO

ATTACHING CABINET

ELECTRICAL SUPPLY

FRONT COVER

Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)

1.Close equipment shutoff valve (see Fig- ure 16).

2.Pressurize supply piping system by either using compressed air or opening main gas valve located on or near gas meter.

3.Check all joints from gas meter to equipment shutoff valve. Apply mix- ture of liquid soap and water to gas joints. Bubbles forming show a leak.

4.Correct all leaks at once.

Pressure Testing Furnace Gas Connections

1.Open equipment shutoff valve (see Fig- ure 16).

2.Open main gas valve located on or near gas meter.

3.Make sure control knob of furnace is in the OFF position.

4.Check all joints from equipment shutoff valve to gas inlet pipe. Apply mixture of liquid soap and water to gas joints. Bubbles forming show a leak.

5.Correct all leaks at once.

6.Turn on furnace (see Operating Fur- nace, pages 12 and 13). Check the rest of the internal joints for leaks.

7.Turn off furnace (see To Turn Off Gas to Furnace, page 13).

On Position

Off Position

Figure 16 - Equipment Shutoff Valve

IMPORTANT: Follow all local codes when connecting electricity to furnace. In the ab- sence of local codes, refer to the latest edi- tion of the National Electrical Code ANS/ NFPA No. 70. If you are not familiar with wiring codes, have a qualified electrician do the wiring.

It is best to plug furnace into a separate and permanent electrical line circuit.

1.Supply a 120-volt, 60-cycle, grounded outlet at furnace location.

2.The furnace has a three-pronged (grounded) plug. Use only a grounded, three-prong outlet.

IMPORTANT: Some local codes require rigid or semi-rigid conduit or metallic sheathe cable. When using a semi-rigid or metallic sheathe cable, the installer must terminate the supply wire in the terminal box opening.

Performance Check

Plug furnace into three-pronged outlet. If ignitor remains on after main burner igni- tion or if the valve chatters, you may have reversed polarity.

1.Unplug furnace.

2.Turn off electricity to outlet.

3.Reverse 120-volt connections inside outlet.

4.Turn on electricity to outlet.

5.Plug in furnace. Ignitor should turn off after main burner ignites. If ignitor does not turn off, or if valve continues to chatter, turn off furnace and unplug. Call a qualified service person.

CAUTION: Do not operate fur- nace with front cover removed or mounted wrong. If front cover is mounted wrong, you cannot se- cure it to cabinet with screws.

1.Hook top of front cover over top cabi- net flange.

2.Secure the sides of front cover to lower sides of furnace cabinet with two screws provided (see Figure 17).

IMPORTANT: You may have removed fur- nace from furnace cabinet during installa- tion. You must correctly install furnace within cabinet. If not, front cover will not properly attach to cabinet. Make sure gas- kets for intake and exhaust tubes are in place. Make sure intake and exhaust tubes extend into vent caps on cabinet back and are secured with screws. Make sure you secured flange on bottom of furnace to flange on bottom front of cabinet.

Figure 17 - Attaching Front Cover to Cabinet

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Desa DNV25NB, DNV40NB installation manual Pressure Testing Furnace Gas Connections, Performance Check
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DNV25NB, DNV40NB specifications

Desa DNV25NB and DNV40NB are contemporary heating solutions designed to meet the demands of modern residential and commercial spaces. Both models integrate advanced technologies, ensuring efficient performance while promoting sustainability and energy conservation.

The DNV25NB is a compact and versatile unit, making it ideal for small to medium-sized environments. It boasts a nominal heating capacity of 25 kW, providing a reliable source of warmth during colder months. One of its main features is the innovative heat pump technology that extracts energy from the environment, thereby lowering electricity consumption compared to traditional heating systems. The unit is also equipped with advanced inverter technology, which allows it to adjust its output according to the heat demand. This results in reduced energy usage and lower utility bills, making it an economical choice for homeowners or businesses aiming to minimize operational costs.

On the other hand, the DNV40NB is designed for larger spaces, offering a robust heating capacity of 40 kW. This model features a dual-stage compressor that enhances its heating efficiency. This technology ensures quick heating response, allowing it to maintain a consistent indoor temperature even in extreme weather conditions. Furthermore, the DNV40NB incorporates smart control systems that enable users to manage settings through a mobile app, providing convenience and remote monitoring capabilities.

Both models are characterized by their eco-friendly refrigerants, which contribute to reduced greenhouse gas emissions. The units are also designed with user-friendly interfaces featuring digital displays, making operation intuitive. Additional safety features, including over-temperature protection and anti-freeze modes, ensure safe usage while prolonging the lifespan of the units.

In terms of installation, both DNV25NB and DNV40NB are designed for easy integration into existing systems. Their compact design enables flexibility in placement without compromising aesthetics. With their reliable performance, energy efficiency, and user-centric technologies, the Desa DNV25NB and DNV40NB offer compelling solutions for those seeking sustainable heating alternatives. Overall, they represent a forward-thinking approach to climate control, combining performance with environmental responsibility.
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