Is an additional pump needed for a double-circuit boiler?

Gas boilers from the South Korean company Navien are well known to Russian users.

They have an optimal combination of price and quality and are adapted to Russian climatic and technological conditions.

The cost of Navien equipment is half that of its European counterparts.

The manufacturer made sure that the boilers withstand changes or low pressure of water and gas, and independently compensate for up to 30% of the voltage drop in the electric current network.

Let's look at the setup technology and methods for eliminating the most common errors that occur during the operation of units.

Repair instructions for gas boilers Navien

Basic boiler settings are carried out simultaneously with the initial installation.

Connection is made to all necessary communications and systems:

• Gas supply.
• Water supply.
• Connection of the direct and return pipelines of the heating system (OB, coolant).
• Connection to the power supply network.
• DHW supply system (distribution to distribution points).

The initial setting of the boiler is carried out using DIP switches and a resistor that regulates the gas supply (pressure). They are located on the unit control board.

IMPORTANT!

Self-tuning of Navien gas boilers is strongly not recommended. To perform this procedure, you should invite a specialist from the service center.

Setting up a Navien gas boiler with your own hands

Korean-made Navien heating boilers are popular in our country. They are reliable and at the same time affordable in price. Due to the great demand for these devices, setting up a Navien gas boiler is a pressing issue among buyers.

Manufacturers of Navien produce devices of different capacities, floor-mounted, wall-mounted and with a hot water supply function. They can be connected both to a centralized line and to gas cylinders. The units have a modern appearance that allows them to fit into any home interior. Navien gas boilers are equipped with a safety group, which includes:

• modulating turbocharging;
• protection against coolant freezing;
• SMPS chip that protects against power surges;
• temperature sensor control panel, which allows you to adjust the operation of the unit to certain circumstances.

The most common model of Navien gas units is Deluxe, so let’s look at them in more detail.

Setting up a Navien gas boiler

Next, we’ll look at how to set up a Navien Deluxe gas boiler with your own hands. Manipulations are carried out using a remote control with a built-in room temperature sensor.

Heating settings

To set the heating mode and set the coolant temperature, hold down the button with the image of a radiator until the same icon appears on the screen. If the “radiator” picture blinks, it means that the set coolant temperature is displayed on the screen. If the symbol does not flash, the actual water heating level is displayed.

To set the desired temperature, use the “+” and “-” buttons with the “radiator” icon flashing. The possible range is from 40ºC to 80ºC. Once the temperature is set, it will be automatically saved. The “radiator” icon will blink for a few seconds, after which the actual temperature of the coolant will be displayed on the screen.

Heating with air temperature control

To set the desired air temperature in the room, you need to hold down the “radiator” button until the image “house with thermometer” appears on the screen. It means “Heating with room temperature control” mode.

When the “house with thermometer” symbol is flashing, the desired room temperature is displayed on the screen. When the icon is not flashing, the display shows the actual room temperature.

When the icon is flashing, using the “+” and “-” buttons, the desired level of heating in the room is set, adjustable in the range of 10-40ºC. The temperature is then automatically saved and the icon stops flashing.

Setting the hot water temperature

To set the hot water temperature, you need to hold down the “water tap” button until a similar flashing symbol appears in the right corner. You can then set the desired hot water temperature between 30ºC and 60ºC. The settings will be automatically saved and the “water tap” symbol will stop flashing.

Note! In the “Hot water priority” mode, the water heating temperature is regulated differently.

How to properly adjust and start

Procedure:

• The boiler startup procedure begins with filling with water. Gas dual-circuit units do not need to install additional devices, so you just need to open the make-up valve and increase the pressure to 1.5-2 At.
• After this, the valve is closed, air pockets are removed from the system and on the unit itself, for which Mayevsky valves on the radiators and an air valve in the boiler are used.
• Then you need to bleed the air from the circulation pump. The casing is removed and the water heating controls are turned on. Specific sounds appear, indicating the operation of the system. On the pump, gradually unscrew the screw in the middle until water appears. This procedure must be done 2-3 times, after which the air from the pump will be completely removed.
• As soon as the circulation pump is brought into operation, the burner will start electronically and the heating system will begin to function.

This completes the initial startup and adjustment procedure..

Principles of installation of a wall-mounted gas boiler

As usual, after purchasing a gas boiler, laying a gas main and installing heating, it’s time to assemble the entire system together. Connecting a Navien boiler, like any other, is not an entirely simple task. And all because each specific model has its own type of connection. In this regard, the installation of such a boiler must be carried out by real specialists.

Before installing the boiler, if it is not fully equipped, you will need to purchase:

• emergency temperature control system;
• power control device;
• thermometer;
• pressure mechanism;
• fuse.

However, in practice, as a rule, any boiler has such a configuration.

When installing a heating system with an open combustion chamber, a separate room with an area of ​​at least 4 m2 and a ceiling height of 2.5 meters must be provided. In addition, do not forget about the presence of a ventilation system. For heating systems with a closed combustion chamber, it is not necessary to provide a ventilation system. It is also worth taking care of installing a socket with an emergency shutdown sensor. Additionally, a stabilizer must be connected, and the boiler itself must be grounded. If the boiler is hung on a wall that is susceptible to fire, it will need to be sheathed with appropriate protective material. The gap between the pipe and the hole made in the wall will need to be closed with cement mortar. Even before connecting the thermoblock, you need to make sure that not the slightest particles of debris remain in the cracks.

Installing and setting up the control of a Navien gas boiler is a rather labor-intensive process that must be carried out by appropriate specialists. If you decide to purchase a Navien gas boiler, you will be pleasantly surprised by its low price and free delivery.

Heating installations with Korean “roots”, Navien, are often used both in private country houses and in apartments.

What is the reason for such popularity, what design features does the equipment have, and what difficulties may a consumer encounter when purchasing a Navien gas boiler?

Instructions for safe use (operation), selection of model and proper care. We'll tell you about everything further.

User manual

Navien gas boilers are operated automatically, with minimal human intervention.

The owner only needs to observe the readings on the display and respond in a timely manner to the appearance of an error code.

In addition, the user determines the operating mode - summer or winter:

• Summer mode is determined only by DHW heating.
• Winter mode starts the heating system simultaneously with the supply of hot water.

The display has a button with a corresponding icon (symbol of a snowflake or sun).

If it is necessary to adjust the extract air temperature or other parameters of the heating system, the winter operating mode must be turned on. Exhaust temperature is adjusted when the radiator icon is flashing.

If it lights up steadily, the display shows the current temperature . By pressing the “radiator” button so that the icon flashes, press the “+” or “-” buttons to change the set coolant temperature.

The icon stops flashing after a while (a few seconds), and the boiler will begin to heat or cool the coolant in accordance with the instructions received.

How to turn off the heating on a Navien boiler - How to turn off the heating on a Navien boiler

When cold weather sets in, the house needs to be warmed up. However, heating is a costly procedure. Therefore, the owner is interested in finding opportunities to save money. One option is the ability to turn off the heating when it is not needed. To carry out this procedure correctly, you need to know its features, which are described in more detail in this article.

Read in the article

The main reasons why you need to turn off the heating on the boiler

It is possible to turn off the heating equipment if necessary. However, in order to make the right decision, you need to decide how necessary this will be, and whether it is worth switching to a special mode of operation of the heating boiler instead.

Important! All this will require a significant investment of time and money, but will pay off within 2-3 heating seasons. Plus, for the entire future, it will provide the apartment with completely independent and high-quality heat and hot water.

It should be taken into account that modern technology has a high level of reliability and economical operating options. Navien heating boilers are equipped with an electronic control panel, with which you can find out about any malfunctions that have occurred or set the most suitable operating mode.

In addition, you need to take into account the comfort of one or another solution. After all, to set the required operating mode, you do not need to perform complex actions, but to prepare the heating boiler for a period of long shutdown and for its subsequent connection, you need to spend some work.

Although it is impossible to live in a house without heating during winter frosts and autumn slush, you can nevertheless indicate periods of time when there is no need for it:

• When summer comes, during the warm spring or autumn there is no need to pay for the operation of the heating boiler.
• One of the applications of such equipment is heating a summer house. Since the owner is not always there, there is no point in worrying about maintaining the temperature in the house during his absence.

Turning equipment off and on after a break requires some effort. You don't always want to do this. There is a desire, instead of turning it off, to turn off the equipment from the network, and then, when the need arises, simply turn it on and continue to use it.

In this case, the boiler will remain cold for a long time, with water in the tanks and heating system. When it becomes necessary to turn it on, the entire system will need to be warmed up again, which will require additional energy consumption.

Important! When the boiler is turned on again after a long period of inactivity, condensation forms, which causes corrosion and fistulas. Sometimes they try to repair a damaged container by soldering, but this is not always possible. Sometimes the tank cannot be repaired and needs to be replaced.

Condensation may remain on the gas burner. In this case, there may be problems with its ignition.

On the other hand, stopping and starting equipment is a difficult period for a gas boiler. At the same time, gas savings during the time when the equipment was not working are usually relatively small. A similar effect can be achieved by choosing an economical mode of using equipment.

If the boiler is turned off during the winter, all water must be pumped out of it. If heating is not carried out and the coolant is left, the liquid in the pipes and boiler may freeze, which can cause malfunctions during operation.

Therefore, we can assume that a complete shutdown is justified only if it is done for a long period.

If there is no need to use the heating boiler for a long time, you need to turn it off for this time. Next we will tell you how to turn off the heating on the Navien boiler.

1. Now it is necessary to de-energize the structure and shut off the gas supply.
2. Since the coolant has been completely removed from the system, it is necessary to close the corresponding valves.
3. You need to open the drain tap and wait until all the water flows out.
4. The tap in the hot water supply system is closed.
5. Open the plug and release all the water from the heating system.

After this, the boiler can not be used for a long time without any problems.

It is important to know how to turn on the Navien boiler for heating. This is done as follows.

When it needs to start, you need to fill the system with water. Then you need to bleed the air. To do this, he is allowed to leave the battery. And then they bleed it from the circulation pump. After this, water is added again. After this, the device can be turned on.

The advantages of boilers of this brand are increased reliability and economical gas consumption.

These heating devices are able to operate efficiently even when the incoming gas pressure drops to 4 mbar (40 millimeters of mercury) and when the water pressure in the water supply network drops to 0.3 bar.

The procedure for turning off the heating on a Navien boiler is the same as described above.

This is a new model of Navien boilers, it has the following features:

• There is built-in protection against cold weather problems. If the temperature reaches −7 degrees, the gas burner will turn on automatically. If it is -10 outside, then a continuous circulation system is activated, in which the coolant will move through the pipes continuously, preventing freezing.
• The material for creating the heating system at Navien Deluxe is stainless steel, which makes the work better.
• The possibility of trouble-free operation is provided in case of strong differences in electrical voltage, as well as at low coolant pressure in the heating system.

Turning off the heating in this system is no different from the usual procedure described above.

Recommendations for caring for the Navien boiler after shutdown

When the boiler is completely turned off, this is a good opportunity to clean the water filters. During operation, they constantly become dirty and require constant care to maintain performance. This is done as follows:

1. The filter is located inside the heating system near the drain plug. To remove it, you must first remove the mounting bracket.
2. To clean, the filter is washed under pressure of cold water.
3. Assembly is performed in reverse order.

If this procedure is not carried out frequently enough, it can lead to overheating of the boiler.

Tips and tricks for disconnecting

It is not recommended to turn off and turn on boilers very often. In some cases, it is more profitable to instead use economical heating modes in accordance with the operating instructions. However, when it comes to stopping work for a long period, a complete shutdown is preferable.

Important! Some people gradually reduce the gas supply to turn off the boiler. This is wrong because it can lead to bad consequences. Typically, the operation of the burner requires the presence of a certain pressure when supplying gas. With low pressure, the behavior of the burner flame will change. In this case, the flame will be pressed against the burner, leading to its overheating and premature wear.

However, this problem does not exist when using modulating burners. Their operating principle is based on adjusting the degree of efficiency of its work. This occurs in the range from 40% to 100%. Depending on the level of pressure in the gas pipe and the required level of heating, the burner regulates the intensity of the flame.

When deciding whether to turn off your heating boiler for long periods in the summer, you need to take into account whether this equipment is used to produce hot water. If there is no need for heating in the summer, then hot water in the household is necessary.

Running self-test

The Navien boiler self-diagnosis system operates constantly and does not require a separate startup.

The probability of a failure of one or another node exists at any time, so the sensors send signals about the status of certain elements 24/7, never stopping.

If the sensor stops working for any reason, the corresponding error code immediately lights up on the display. This is an important function that helps maintain performance and timely troubleshooting .

Popular models of Navien heating systems

Model ATMO

Navien ATMO gas boilers have a system for removing generated vapors through a simple chimney.
This design is adapted to work in extreme conditions with strong changes in gas pipeline voltage and pressure.
NSN model

This is the most modern Navien gas boiler, which has high performance using steam temperatures. The heated condensate is collected in a heat exchanger, which heats the water flow. Thus, the costs of sources and energy carriers for heating the heat and water exchanger are reduced.

Basic error codes and their interpretation

Let's look at what error codes may appear on the unit display:

The appearance of most errors is accompanied by a shutdown of the boiler, which is dangerous in winter, so you should respond to them as quickly as possible.

What is the operating principle of Navien boilers?

The operation of Navien boilers is based on the same principles as similar devices from other manufacturers.

Composition and types of boilers

Each such device includes the following main components:

• gas stove;
• gas supply control mechanism;
• heat exchange device.

In a single-circuit modification, hot water immediately enters the heating system of the house. Double-circuit models include an additional water heating circuit for the home hot water supply system (DHW). When this circuit is turned on, the operation of the heating system is suspended.

Exhaust gas removal

Gas combustion chambers in boilers are open (atmospheric) and closed (turbocharged). In atmospheric models, smoke independently leaves the room through the chimney. In turbine engines, exhaust gases are removed by force using a fan through a pipe through the outer wall of the house.

Important! In rooms where a gas boiler is installed, constant exhaust ventilation is required. This is especially important for atmospheric models.

Gas-burners

One of the main components of a gas boiler is, of course, a gas burner. As a rule, modern models are equipped with modulating burners. They allow you to modulate the flame, controlling the gas supply depending on the need to adjust the air temperature in the premises or water in the hot water system. When the device is equipped with an automatically adjustable modulating burner, the heating system will accurately maintain the set temperature.

Common malfunctions and their elimination

Let's look at the main ways to eliminate errors that have arisen.:

E 01-02

This error indicates overheating of the equipment due to the lack of coolant in the system. The solution to the problem is to clean the pipelines or check the pump. Alternatively, it is necessary to remove air from the system (primarily from the pump).

E 03

The functionality of the flame sensor is checked. Cleaning ignition electrodes.

It is also necessary to check the presence of gas in the line or cylinders.

E 05

A malfunction of the temperature sensor can be eliminated by checking its condition. The resistance of the sensor is measured at a certain temperature. If the readings correspond to the standard ones, it is necessary to clean the contacts.

If the sensor readings do not correspond to the table values, replacement with a new, functional unit is required..

E 09

First of all, you should measure the resistance on the fan windings, which should be 23 Ohms.

Check if there is power supply at the terminals. If serious problems are detected, the fan is completely replaced.

E 10

Most often, the problem lies in the sensor itself. It is necessary to check its condition, clean the contacts, and replace it if necessary.

E 13

The flow sensor often gets stuck due to clogging of the actuator with small debris, lime deposits, etc. If cleaning the sensor does not give the expected result, a possible breakdown to the control board is checked.

If there is no result, the sensor is replaced.

E 16

Overheating of the boiler can have several reasons, the most common of which is clogging of the heat exchanger and poor flow of the coolant. The protection is triggered at 98°, the alarm is switched off when the boiler cools to 83°.

There are two ways to solve the problem - first you should clean (in difficult cases, replace) the heat exchanger; if there is no positive result, replace the sensor.

E 18

Overheating of the smoke exhaust sensor occurs when the chimney is blocked . The cause may be condensation freezing, strong winds from outside, or foreign objects or debris getting into the chimney. If eliminating interference with the output of combustion products does not bring any results, the sensor should be replaced.

E 27

Lack of air pressure when the fan is running most often indicates a clogged air duct or the need to replace the sensor . Most often, the reason lies precisely in this, since the entry of foreign objects into a closed air channel is extremely difficult.

Why does blood pressure drop?

The cause of a drop in water pressure in the system can only be a leak. At the same time, it can be both in the boiler itself and outside it - in pipelines, radiators, etc.

It is necessary to open the feed valve, start the boiler and carefully inspect the entire system, step by step. If no leaks are found, the boiler must be inspected. When looking for the cause, you should be guided by the rate of pressure drop.

Perhaps the water goes into the expansion tank, in which the membrane has ruptured. Another reason could be a worn safety valve. If it is connected to the sewer, the leakage will not be noticeable.

NOTE!

In any case, the drop in pressure indicates that it is going somewhere. It is necessary to find the leak, otherwise it may get wet and destroy the structure of the house.

Description

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

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

The ability to call a boiler repair and adjustment specialist to your home is very important

• Appearance and dimensions . The device must fit into the overall interior of the room and have a convenient size.

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 feature above, but it is worthy of mentioning it again: Navien products, not inferior in quality to their Western counterparts, have a significantly lower cost.
2. Two circuits. This means the ability to simultaneously heat the room and heat water for household needs.

Dual-circuit heating scheme

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

Steel heat exchanger with anti-corrosion coating

1. Reliable protection against freezing. If the liquid temperature drops to +10 degrees Celsius, the circulation pump turns on. As it continues to decrease, after reaching +6 degrees, the gas burner starts working, heating the water to +21 degrees.
2. High efficiency. It is achieved due to the synchronous action of the turbocharging system and the air pressure sensor, 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 boiler walls have a high level of sound insulation, which is especially appreciated at night.
4. Adaptation to the harsh working conditions inherent in our regions. The described unit can withstand voltage fluctuations of 30% of the norm and a drop in water pressure in the system up to 0.1 bar without turning off. Reducing the on and off 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.

Gas unit control panel

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

Advice: it is recommended to make a purchase 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 the sake of a better understanding of the operation of the device, it is worth analyzing the purpose of several of its components:

1. Pressure gauge . Designed to measure liquid pressure inside the boiler. If it drops to 0.5 bar, it is necessary to open the make-up tap and bring it to the normal value of 1.2-2 bar. Then the tap is turned off.

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

Sample safety valve

1. Heating water filter . Collects and accumulates various contaminants that form in the liquid during operation of the device.

Tip: it is necessary to periodically remove the filter and clean it. Otherwise, as a result of its clogging, overheating of the equipment occurs.

You may encounter abbreviations and special symbols 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 point inside warns of a threat to life if safety rules are not followed.
• A crossed out circle indicates a prohibited action.
• An exclamation point in a circle indicates that the specified actions must be performed.

Also included in the package is a remote control with the following structure:

Reasons for increased pressure

An increase in pressure in the boiler is primarily demonstrated by the safety valve, which begins to release excess pressure. This problem often confuses even experienced specialists.

The reason lies in the secondary heat exchanger. Hot water is heated from the already heated heating agent, receiving energy in a plate secondary heat exchanger. Both liquids exchange thermal energy without mixing with each other.

But, if a fistula occurs, allowing water from the hot water system to penetrate into the heating system, the pressure will increase and tend to balance with the higher pressure of domestic hot water.

If such a problem occurs, the secondary heat exchanger should be replaced, since repairing it is complicated and ineffective.

Navien boilers: new heating options

Even with minimal gas pressure you can use heating and hot water.
A durable protection system prevents owners from freezing. If the media temperature drops, the frost protection mechanism is automatically activated and the circulation pump starts running. The system provides reliable and uninterrupted circulation of the coolant. You can use hot water even at low pressure. The Navien wall-mounted double-circuit boiler works perfectly at low water pressure up to 0.1 bar, so it is widely used in residential areas with minimal water pressure in the water supply, as well as in cases of constant power failures. The buyer receives a long service life of a wall-mounted double-circuit boiler, thanks to a heat exchanger made of reliable steel, which prevents rust and corrosion.

The Navien wall-mounted double-circuit boiler operates on the basis of the APS mechanism, which guarantees stable combustion and reduces gas costs. The mechanism controls the amount of gas that penetrates the burner, ensuring total combustion of fuel, reducing its consumption. A fan with controlled rotation speed promotes safe combustion. Therefore, the Navien wall-mounted double-circuit boiler can be used in apartment buildings. The convenient location of the APS mechanism prevents condensation.

Features of the Navien boiler design:

• circulation pump;
• universal separate heat exchanger;
• tank;
• automatic control system;
• the ability to operate the boiler on natural and liquid gas;
• convenient choice of heating mode. You can choose any temperature that will be present in the house;
• timer function. You can set any time for stopping the boiler operation. The Navien boiler will work for half an hour during the set time with further shutdown. If you set the time to 4, then heating will be carried out for four hours, half an hour at a time;
• With one function you can save fuel consumption and, at the same time, maintain the temperature when you are not at home.

Power-on problems

There may be several reasons for such a malfunction.:

• There is no voltage in the network (or it has decreased too much, it has become less than 150 V).
• No gas.
• The boiler is blocked by a protection system that was activated due to a critical error (overheating above 98°).

Other reasons for failure may also occur . First of all, you should check the voltage in the network.

The boiler is capable of compensating for fluctuations of up to 30%, but with more significant changes, it simply will not start. You can solve the issue by using a separate outlet and installing a stabilizer.

If all possible causes have been checked and eliminated, but the boiler continues to be silent, you should invite a specialist . Perhaps the cause was a failure of the control unit, a breakdown, or another serious problem.

You should not attempt to resolve the issue yourself; this may cause the final destruction of the unit.

Heating boiler Navien: bestseller

Navien gas boilers are leaders in the field of heating and water heating devices. The Navien company offers only high-tech solutions for any premises. On the heating systems market you will always find a device that will serve you for a long time at a very low price. Navien wall-mounted gas systems are intended for heating apartments and small private houses.

Navien Deluxe brand is a domestic double-circuit boiler with open and closed combustion sections. They heat and heat water for domestic and technical purposes. All automation is in Russian , which allows you not only to read the instructions correctly, but also to save on heating and constantly maintain the optimal temperature in the room. Reliable and safe operation of the boiler performs its functions even with regular voltage failures. If the network voltage fluctuates, the SMPS protective function is activated in the systems and then the mechanism operates uninterruptedly. That is why such wall-mounted double-circuit boilers have a long service life and protect owners from breakdowns and further repairs.

Doesn't start for a long time

The boiler is started when certain conditions are reached. If the temperature or pressure of water (OB, DHW) is within the specified range, heating will not start until it cools down .

A possible cause may also be partial clogging of the water filter, which slows down the flow and changes the circulation mode. It may be difficult for the circulation pump to operate if it is clogged with lime deposits or small debris.

Download instructions

You can download the instructions here.

What to do if the aspirated air leaks?

For the Atmo model range with an open (atmospheric) burner, the primary heat exchanger is made of copper.

The appearance of a leak is almost always associated with its destruction. Purchasing a new heat exchanger is not an easy and expensive task, so most often the issue is solved by soldering the fistula .

To carry out repairs, you should contact a technician from the service center, since this requires a qualified specialist who can dismantle the unit, find the fistula that has arisen, solder it properly, simultaneously rinse the heat exchanger and install it in place without damage.

The work is complex and requires the participation of a trained person.