Features of gas equipment from NAVIEN

About company

Currently, the South Korean company Navien is one of the world's largest manufacturers, whose main specialization is the creation of gas and diesel boilers that are used for domestic use.

Navien works according to four main principles: sustainable development, the discovery of ethical values ​​for society, ecology and care for the environment and people.

The company began its activities in 1978, and has been operating successfully since then. For almost 40 years, the described manufacturer has been able to take a strong position in the market and win the trust of users.

Korean Navien gas boilers are inexpensive, reliable, but at the same time easy-to-use equipment that has a lot of positive consumer reviews.

Reviews for the Navien Ace boiler

Device

The Navien boiler consists of the following components:

• Heat exchanger combined with a gas burner.
• Expansion tank.
• Circulation pump.
• Turbocharger fan.
• Three-way and gas valves.
• Sensors and control boards, remote control panel.
• Connecting pipes, connecting pipelines, other parts.

The movement of the OM and DHW flows is provided by a circulation pump; heating is performed by the burner and heat exchanger. The temperature is adjusted using a three-way valve that mixes a certain amount of cold water into the hot stream to achieve the set temperature.

Design and principle of operation

The design of the Navien gas heating boiler includes a large number of different parts and components. That is why, when choosing a specific model, you should know its structure and operating principle.

Boiler structure Navien Deluxe

Heating devices produced by the South Korean manufacturer are practically no different from Italian, German and other European analogues, which include unique components. Navien wall-mounted and floor-mounted gas boilers are available for sale. Let's consider the main elements that are included in the design of the device:

1. The body is made of two parts. On the back wall there are parts for installing and fixing the components of the device, as well as mounting holes for mounting to the wall. The front cover acts as a protective cover. There is a window for the pressure gauge and equipment controls on it.
2. Water circuit. The components of this unit are several pipes: for supplying cold water, the outlet of heating fluid from the boiler to supply the heating system, the return inlet from the heating circuit, the outlet for connecting the hot pipeline. The water line inside the device is made of stainless steel. There is a circulation tank that ensures unhindered movement of the heating fluid to the water circuit. Compensation of excess pressure is carried out using a membrane expansion tank.
   

   The Navien company completes its gas boilers with elements that are produced at the company's facilities. Due to this, the cost of products is much lower than European analogues, which have units from various manufacturers installed.

3. The combustion chamber. This includes: the burner, electrodes for ignition and ionization, which are connected to the ignition transformer, the burner nozzle manifold and the chamber body itself.
4. Heat exchanger; dual-circuit units have two of them. One is used to heat the coolant circulating through the heating circuit - the main one. The other provides the house with hot water - the secondary one. The first is located directly in front of the combustion chamber, the other is located at the bottom of the unit. The manufacturing material of both heat exchangers is stainless steel.
5. Control. Navien heating devices have an electronic control system.
6. Protection. The design includes sensors for monitoring the temperature and flow of heating fluid, the flow of hot water. The package also includes an automatic air vent and a safety valve for emergency discharge of heating fluid.

The operating principle of the equipment is identical to all analogues. The control system selects the desired temperature conditions for the heating circuit and hot water. The main heat exchanger heats the coolant.

More information about the types of heat exchangers for gas boilers is presented in this article

The circulation pump ensures its movement through the internal pipeline to the coil, which provides heating for the hot pipeline and then into the heating system.

Heat exchangers made of stainless steel. characterized by a longer service life than conventional steel or bithermic ones.

Description

When choosing a boiler for your home, first of all, pay attention to the following points:

• performance and functionality . In other words, the technical capabilities of the device, including its additional devices and power.
• availability and durability of warranty service . If you invest money in equipment, you want to have guarantees that it will serve you for a long time.

• Dimensions and Appearance . The device must fit into the non-specialized interior of the room and have ergonomic dimensions.

Based on this, let's look at the advantages that Navien gas mounted heating boilers provide to their owners.

Main advantages

1. Affordable price. We have already briefly noted this highlight above, but it is good to mention it again: Navien products, not inferior in quality to their Western counterparts, have a much lower price.
2. Two circuits. This indicates the ability to simultaneously heat the room and heat water for household needs.

1. Heat exchanger made of stainless steel. In most cases, copper is used in such equipment due to its higher thermal conductivity, but this significantly increases the final cost of the entire boiler. Loss in power when using stainless steel is compensated by turbocharging the gas burner.

1. Reliable protection against freezing. If the liquid temperature drops to +10 degrees Celsius, the circulation pump turns on. When it continues to decrease, after reaching +6 degrees, the gas burner starts working, which heats the water to +21 degrees.
2. Large coefficient of required action. It is achieved due to the system pressure sensor and the synchronous action of the air turbo, which allows you to control the rotation speed of the fan located above the burner. Thanks to this device, gas and air are mixed in the most optimal ratio, which guarantees its complete oxidation. Thus, energy consumption is much more economical.
3. Quiet operation. The walls of the boiler have a high level of sound insulation, which is very valuable at night.
4. Adaptation to the harsh working conditions typical of our regions. The described unit can withstand voltage fluctuations of 30% from the drop and the water pressure in the system up to 0.1 bar, without turning off at the same time. Reducing switching off and switching cycles leads to an increase in service life.

1. Easy to use with your own hands. The boiler is fully automated and equipped with a control panel that simplifies the use of the device.

1. Availability of warranty and service. The instructions contain the correct period of time during which your purchased equipment will not be left without expert supervision.

Advice: it is recommended to make purchases only at official representative offices in order to avoid purchasing a counterfeit and to have confidence in the legitimacy of the warranty provided.

1. Components from one manufacturer. The only part that is ordered from Japan is the Time gas valve. This approach significantly increases the reliability of the assembly, in contrast to those boilers whose components are manufactured in different parts of the world.

Design

Navien gas heating boilers have the following structure:

Additionally, for a better understanding of the operation of the device, it is worth analyzing the purpose of several of its components:

1. Pressure gauge . Recommended for measuring liquid pressure in a boiler. If it drops to 0.5 bar, you need to open the make-up tap and bring it to the usual value of 1.2-2 bar. After this, the tap is closed.

1. Safety valve. It is triggered when the heating water reaches a pressure of 3 bar, opening and discharging excess water.

1. Heating water filter . Collects and accumulates various pollutants that are formed in the liquid during operation of the device.

Tip: sometimes you need to remove the filter and clean it. Otherwise, as a result of its clogging, overheating of the equipment occurs.

You may see abbreviations and special signs on the boiler itself or in its instructions:

• OV – heating water.
• DHW – hot water supply.
• Cold water supply - cold water supply.
• A triangle with an exclamation mark warns of a threat to life if safety rules are not followed.
• A crossed out circle indicates that an action is prohibited.
• An exclamation symbol in a circle indicates the required execution of the specified actions.

In addition, the package includes a remote control with the following structure:

Advantages and disadvantages of Navien gas boilers

Pros:

• intelligent remote control - it is available in the advanced Smart Tok line;
• the design includes modulating burners, which ensure silent ignition, smooth temperature control in the circuit and reduced thermal load on internal components;
• Navien units operating on gas have voice guidance, making their control even more convenient;
• the devices are adapted to domestic operating conditions and operate stably under gas pressure fluctuations;
• self-diagnosis, thanks to which owners receive information about failures and malfunctions as soon as possible;
• good price/quality ratio;
• a wide selection of models made in different colors;
• repairs will be inexpensive.

Minuses:

• During operation, boilers make noise;
• Only original components are suitable for repairs.

Specifications

Let's look at the main parameters of Navien gas boilers:

Navien boiler range

Based on the number of circuits, there are: double-circuit and single-circuit gas boilers Navien. The units are also divided according to the method of removing combustion products:

• atmospheric - here the removal of combustion products and the flow of air is carried out due to natural circulation. The combustion chamber of such devices is open;
• turbocharged - here the injection of air and removal of combustion products occurs through a supply and exhaust fan. In such models, the chimney can be either coaxial or separate. In the first case, the exhaust pipe is located inside the supply pipe.

Boiler models are available with different power ratings: from 10 to 40 kW. Heating devices can effectively cope with heating rooms with an area of ​​30 to 400 m². When heating water to a temperature of 25°C, the equipment productivity is 7-23 l/min, up to 40°C - from 4 to 14 l/min.

The automation, which is included in the equipment, makes it possible to collect hot water at several points at once and at the same time maintain the specified temperature.

You will find information about automation for gas boilers here

On the Russian market, Navien's products are represented by two brands: Deluxe and Ace. The marking of models indicates power - a digital value in kW.

Turbocharged units have a letter designation of the type of chimney: E - Euro indicates a coaxial type, K - Korean design, i.e. - separate.

Devices with open markings are designated by the index A - atmospheric.

The electronic control of the equipment is equipped with a protective chip, which acts as a compensator for voltage drops and surges in power lines up to 30%. Exactly the same technology is used in boilers from the German manufacturer VaiLlant.

Prime

Navien Prime with weather-dependent automatic control

Of all the products produced by the company, this series contains the best innovative technologies. The units are designed to heat and supply the house with hot water. Due to its design, this device has the following advantages:

• able to function even at a minimum gas pressure of 0.13 bar;
• provision of hot water supply even with a significant reduction in pressure in water pipes;
• built-in system for monitoring the operation of the device depending on the weather.
  In order to bring it into an active state, you need to install a sensor on the street; The operating principle of weather-compensating automation is described in this post
• the built-in circulation pump comes into operation when the room temperature drops to 5°C;
• there is a functional liquid crystal display;
• good protection against voltage surges in the network - up to 30% of the standard value. In this case, the boiler continues to function, but the internal protection supplies an already stabilized voltage;
• stainless steel heat exchanger, which reduces the risk of corrosion and deposits on the surface.

Boilers are available in a power range from 13 to 30 kW.

Deluxe

Navien Deluxe Plus dual circuit

The Navien Deluxe gas boiler has all the same properties that were described in the previous model. In addition, it is worth noting that the package includes an APS air pressure sensor, which saves gas consumption during the operation of the boiler. It regulates the power of the air flow generated by the fan. Moreover, it is located in such a way that the risk of condensation getting on the surface is reduced to zero. Models are presented in the range from 10 to 40 kW.

The Navien DELUXE 24K gas boiler is in demand among consumers. This is a wall-mounted unit with a closed combustion chamber. The heat exchanger here is made of steel, which is more of a minus than a plus. As the name implies, the power here is 24 kW, the productivity of the hot water supply circuit is up to 13.8 l/min.

The package includes electronic control with a diagnostic system and a room thermostat. The performance of this gas boiler is high, efficiency reaches 90%.

Customers' opinions

“I chose the gas Navien Deluxe 24K as the main heating device for the cottage because it was impossible to allocate a separate room for the boiler room; the wall-mounted model was just right. During operation, I did not reveal any particular shortcomings or malfunctions. The disadvantages include dependence on the electrical network and specific noise - the higher the power, the stronger the roar of the boiler.”

“I decided to buy Navien Ace to replace a failed gas boiler, after wintering I noticed a slight decrease in gas consumption, convenient and accurate automation. During the year of operation, it stopped for no particular reason twice, then it was restarted manually, and I still did not understand what was connected with it. The chimney makes noise, but you can’t hear it behind a closed door, and I didn’t find any obvious disadvantages or shortcomings.”

Sergey Trofimov, Moscow region.

“I consider Navien brand boilers a good investment; this equipment from Korea is better suited for our conditions than European models, and uses gas more economically compared to Russian ones. Of course, they are dependent on electricity, but the same can be said about any heating circuit with a circulating pump, and fans consume little. Noise is a generally recognized disadvantage, but they are located in a place convenient for the owner, the main thing is that the lighting is normal.”

“I installed a Prime 13K boiler from Navien at home; there are enough resources to efficiently heat all rooms and provide hot water for a family of three. I liked that the thermostat was included in the basic kit; I didn’t have to buy it separately. Fault signals are displayed, the control system is Russified, and there are no problems with startup or maintenance.”

“I have been using a condensing double-circuit gas boiler of the Navien brand for heating and domestic hot water needs for more than a year, and during its operation I have not identified any malfunctions. The cost of the model is one and a half to two times higher than conventional wall-mounted analogues from Korea, but it is worth buying if you need significant consumption of hot water. I advise you to connect the boiler through a stabilizer; in my area, for example, voltage surges exceed the 30% specified in the instructions.”