Desa DNV25NB, DNV40NB installation manual Observed Problem Possible Cause

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OWNER’S MANUAL

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

Ignition failures

1. Glo bar will not glow - with blower run-

 

ning and microswitch engaged

2. Glo bar glows but burner will not come on

3. Glo bar operating and gas valve open- ing but burner will not light

4. If the ignitor remains on after main burner ignition or the valve chatters, re- verse the 120-volt A.C. connections at the wall receptacle

1.Check the following:

A.Check for 24 volts A.C. across yellow and orange wires at ignition control. If no volt- age, check microswitch and limit switch for circuit completion as well as wiring and wir- ing connections

B.Voltage present across yellow and orange wires, check for 120-volt input to ignition control across red and blue wires. If no voltage, check wiring all the way back to power supply

C.120 volts present across red and blue wires, check for 120 volts across the two white wires at ignition control. If no voltage, replace igni- tion control

D.Voltage present across the two white wires, check wiring and wire connections to glo bar

E.If wiring and wire connections okay, replace glo bar. (Glo bar broken)

2.A. Check for voltage (24 volts A.C.) at valve 40 seconds after glo bar begins to glow. If voltage present but valve not opening, replace valve

B.If no voltage at valve, check brown wire at ignition control for continuity and good con- nection

C.If wire and wire connections okay, replace ignition control

3.A. Check gas flow through burner. If no gas is coming through burner, check for obstruc- tion in gas line, main burner orifice, or main burner

B.If thermostat okay, check for 24 volt A.C. circuit completion across yellow and orange wires at ignition control. If no voltage, check for circuit completion through limit switch and microswitch

C.If voltage is present at ignition control across yellow and orange wires yet burner contin- ues to go off, replace ignition control

4.A. If polarity is okay yet burner continues to go off, check thermostat to be sure it is still com- pleting the valve circuit. If not, check for excessive amp draw in valve circuit

B.If thermostat okay, check for 24 volt A.C. circuit completion across yellow and orange wires at ignition control. If no voltage, check for circuit completion through limit switch and microswitch

C.Voltage present at ignition control across yellow and orange wires yet burner contin- ues to go off, replace ignition control

www.desatech.com

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Contents For Your Safety What to do if YOU Smell GAS OWNER’S Operation and Installation Manual DNV25NB DNV40NBFor Your Safety Dynavent Safety InformationSpecifications Product FeaturesLocal Codes UnpackingInstallation Items InstallationCheck GAS Type Locating FurnaceInstalling in Normal Frame Wall Installing ThermostatInstalling in Masonry Wall Creating Wall Opening and Mounting FurnaceRouting Thermostat Cable Locating Thermostat on WallMounting the Thermostat to Wall Connecting to GAS SupplyConnecting Furnace to Gas Supply at Front of Furnace Removing Screws on Lower Flange 40,000 BTU/Hr Model Shown Connecting Furnace to Gas Supply at Rear of FurnaceExample Providing Gas Piping to FurnaceChecking GAS Connections Pressure Testing Gas Supply Piping SystemPerformance Check Pressure Testing Furnace Gas ConnectionsOperating Instructions For Your Safety Read Before LightingOperating Furnace Normal Operating Sequence Inspecting Burner FlameTo Turn OFF GAS To Furnace Thermostat Control OperationCleaning and Maintenance Observed Problem Possible Cause Remedy TroubleshootingIgnition Failures Observed Problem Possible Cause Wire and wire connections at probe Parts Under Warranty Wiring Diagrams ReplacementParts not Under Warranty PartsTechnical Service Service HintsWhen Gas Pressure Is Too Low When Gas Quality Is BadCabinet Assembly 25,000 BTU/HR Model Illustrated Parts ListCabinet 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 International Limited Warranty Dynavent GAS Wall Furnace

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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