Desa DNV40NB, DNV25NB installation manual Ignition Failures

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DYNAVENT®

DIRECT-VENT NATURAL GAS HEATER

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

 

No heat (continued)

7.

Blower not operating

7.

A. Check power supply to furnace

 

 

 

 

B. Check electrical connections at furnace

 

 

 

 

C. With thermostat points closed, check for cir-

 

 

 

 

cuit completion at motor. If voltage is present,

 

 

 

 

replace motor. If no voltage is present at mo-

 

 

 

 

tor, check for:

 

 

 

 

• 24 volts on secondary coil or transformer. If

 

 

 

 

no voltage, replace transformer.

 

 

 

 

• If 24 volt transformer okay, check for circuit

 

 

 

 

completion across contacts on time delay

 

 

 

 

relay. Allow three to five seconds for con-

 

 

 

 

tact to close

 

 

 

 

• If circuit across contacts okay, check conti-

 

 

 

 

nuity of wiring in motor circuit

 

8.

Short cycling (motor goes on and off)

8.

A. Check thermostat. Contacts should remain

 

 

 

 

closed. If contacts are breaking:

• Check thermostat anticipator setting. It should be between .75 and 1.0

• If anticipator setting okay, check amp draw across thermostat. If amp draw exceeds .65, check amp draw across coil of valve and time delay relay. Note: On initial operation of glo bar, there is a momentary surge of approxi- mately 4.0 amps

• If amp draw is within limits, check for shorts in thermostat wiring

• If wiring is okay, replace thermostat

IGNITION FAILURES

WARNINGS:

•Never connect unit or ignition circuit to 230 volts.

•Never operate unit with glo bar touching burner or any other ground. Damage to ignition control will occur.

•Be sure sensor probe never touches glo bar. This will dam- age ignition control.

•If the ignition control is defec- tive, it must be replaced. It is not field-repairable.

The electronic system is made up of two parts: the ignition control and the glo bar. The ignition control is the brain of the elec- tronic system. It has several functions:

1.When the blower reaches full r.p.m., a 24-volt circuit is completed to the ig- nition control. (Check across yellow and orange wires.)

2.The red and blue wires at the ignition control are the 120-volt input for the glo-bar circuit. When the 24-volt cir- cuit is completed, the ignition control will complete the 120-volt circuit to the glo bar and it begins to glow. (Check this circuit across the two white wires at the ignition control.)

nition control to a neutral ground.) This circuit opens the valve, gas flows to the burner and is ignited by the heat from the glo bar. Note: Glo bar remains on.

4.When the burner flame is established, the sensing probe will sense the pres- ence of burner flame and open the glo- bar circuit. The glo bar will then stop glowing.

It is important to determine the type of problem being experienced. Then the proper checkout procedure can be made. The fol- lowing is a list of problems, how to identify in which area the problem is located, and how to correct it.

CAUTION: Do not attempt to repair the ignition control. This may alter it and cause it to oper- ate incorrectly.

3.After approximately 20 seconds, a 24- volt circuit is completed through the ig- nition control to the gas valve. (This cir- cuit is checked from brown wire at ig-

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201835

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Contents For Your Safety OWNER’S Operation and Installation Manual DNV25NB DNV40NBFor Your Safety What to do if YOU Smell GAS Safety Information DynaventProduct Features SpecificationsLocal Codes UnpackingInstallation Installation ItemsCheck GAS Type Locating FurnaceInstalling Thermostat Installing in Normal Frame WallInstalling in Masonry Wall Creating Wall Opening and Mounting FurnaceLocating Thermostat on Wall Routing Thermostat CableConnecting Furnace to Gas Supply at Front of Furnace Connecting to GAS SupplyMounting the Thermostat to Wall Connecting Furnace to Gas Supply at Rear of Furnace Removing Screws on Lower Flange 40,000 BTU/Hr Model ShownProviding Gas Piping to Furnace ExamplePressure Testing Gas Supply Piping System Checking GAS ConnectionsPressure Testing Furnace Gas Connections Performance CheckOperating Furnace For Your Safety Read Before LightingOperating Instructions Inspecting Burner Flame Normal Operating SequenceTo Turn OFF GAS To Furnace Thermostat Control OperationCleaning and Maintenance Troubleshooting Observed Problem Possible Cause RemedyIgnition Failures Observed Problem Possible Cause Wire and wire connections at probe Wiring Diagrams Replacement Parts Under WarrantyParts not Under Warranty PartsService Hints Technical ServiceWhen Gas Pressure Is Too Low When Gas Quality Is BadIllustrated Parts List Cabinet Assembly 25,000 BTU/HR ModelCabinet Assembly 40,000 BTU/HR Model Combustion Chamber Assembly 25,000 BTU/HR Model Combustion Chamber Assembly 40,000 BTU/HR Model Burner Assembly 25,000 BTU/HR Model Burner Assembly 40,000 BTU/HR Model Blower Assembly 25,000 BTU/HR Model Blower Assembly 40,000 BTU/HR Model 201835 Limited Warranty Dynavent GAS Wall Furnace International

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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