Heat gun DIY repairman

In detail: do-it-yourself repair heat gun from a real master for the site my.housecope.com.

To heat various rooms and maintain the required temperature, we are faced with the question: What kind of fan heater should be purchased?

- And we need to approach such a question rationally and economically.

Economical - taking into account the consumption of electrical energy. Reasonable - from the point of view of choosing this product for a fan heater.

Currently, we are simply at a loss in front of such a choice, since there is a wide range of products on sale:

various designs;
various types of modifications

and the power of fan heaters.

So what kind of fan heater do we need to buy ?:

IRIT IR - 604, power 1000-2000 W;
Delta B - 801 - 1, 2000 W;
WATT WCH - 1500, 1500 W;
First TZ - FH3, 2000W

I would believe that the following conditions should be taken into account when purchasing:

area of the room;
time of heating the room with subsequent maintenance of the required air temperature;
type of premises.

- premises, when purchasing, should not be neglected in the advisory approach to such a solution to the issue. This implies the advice of the seller-consultant himself in choosing a heater.

To successfully carry out repairs to troubleshoot fan heaters, you need to know - how these heaters are arranged.

Both the electrical circuit itself and its individual elements included in the circuit do not require great knowledge in electrical engineering in their understanding.

What is the point here? - The bottom line is the very value of the resistance of the fan heater.

From the section on electrical engineering, we know that the lower the resistance both for the electrical circuit as a whole, and in particular for the heaters, the greater the current value will be accordingly.

Video (click to play).

To put it more simply, the less the resistance of any heating element, the heating coil of the fan heater, the greater the degree of heating.

Of course, fan heaters have their own permissible resistance value. Consider the electrical diagram of fan heaters intended for connection to a two-wire single-phase network.

As a rule, for safe use of fan heaters, their grounding must also be taken into account, that is, the combination of a grounding device with the metal casing of the fan heater.

This electrical diagram Fig. 1 of the fan heater consists of:

switch SA1;
two thermostats SK1, SK2;
electric motor M1;
heater EK1.

The electric motor in the electric circuit is the electric fan, which creates air injection to the heater.

The EK1 heater can be an ordinary electric heating coil made of nichrome.

The SK2 thermostat provides the preset heating mode of the EK1 heater for this circuit, from 5 to 40 degrees Celsius. Timely shutdown is also ensured upon reaching the set mode of the heater heating temperature.

The switching on and off of the heater here occurs due to the heating and cooling of the bimetallic plate of the thermostat, which is the switch contacts.

The diagram shows the connection of the ground wire to the metal casing of the fan heater. The connection of the fan motor and the EK1 heater is parallel in the electrical circuit.

SA1, SK1, SK2, - have a serial connection in the circuit. The electrical circuit for this circuit is closed at the electric motor and heater.

Possible reasons for a fan heater malfunction may be:

oxidation or burning of contacts SA1, SK1, SK2;
burnout of the copper wire in the stator winding of the electric motor;
burnout of the heating coil of the heater;
burnout of the wire in connection with the plug;
burnout of the wire in the contact connection with the heater;
mechanical damage to the wire in the network cable

Consider the following diagram, a diagram of a three-phase fan heater TVK 612; 912.

three-phase fan heater TVK 612; 912

The three-phase fan heater consists of three heaters EK1, EK2, EK3. Two phases L2, L3 are connected through a contactor to heaters EK2, EK3.

Phase L1 is connected to switch SA1 through disk thermostat SK1.

From the switch, as seen in the diagram, there are two taps from phase L1. One branch of the phase current L1 through the switch SA1 goes to the contact connection with the electric motor.

Another branch of the phase current L1 is connected to the contactor KM1, then the phase L1 is connected to the first heater EK1.

The neutral neutral wire also has two branches. One branch of the neutral wire is connected to the electric motor, that is, the electric motor is connected to an external voltage source 220V, phase L1 and neutral.

Another neutral branch is connected via a contactor to the switch. In other words, by closing the switch contacts, the operating mode of the heaters can be controlled.

The electric motor, as shown in the diagram, is electrically connected to the body by ground, just like the body of the fan heater itself, namely, the body of the electric motor and the body of the fan heater are connected to ground.

I believe that it is not so important here to learn how to outline all the available connections for a given electrical circuit. It is enough just to carefully trace its individual sections.

The principle of operation of a household fan heater is the same as that of a heat gun that heats, for example, a warehouse or some other room.

To diagnose the fan heater circuit for individual sections of the electrical circuit, individual elements in the electrical circuit, it is necessary to disassemble this heating appliance.

To disassemble the fan heat, you need a screwdriver for the corresponding screw head. With such a diagnosis, you will need:

probe or indicator screwdriver with batteries;
device Multimeter or Ohmmeter.

Diagnostics both for individual sections of the electrical circuit and for individual elements included in the electrical circuit of the fan heater can be carried out with a probe. Currently, there is a wide range of different probes on sale, for example, in my practice I use the Navigator NTP-E probe, since I also need it for work on the electrical part.

The ohmmeter device is necessary after all the electrical connections have been made, because before connecting the fan heater to the outlet, you need to check the heating device for resistance.

After removing the cover, we turn our attention to the fuses, which are in the electrical circuit. Fan heaters usually have a blown fuse.

In the photograph, we can see the fuses with the designation of the pointing arrows:

blue arrow - fuse;
yellow arrow - overheat fuse.

This photo shows a fuse with a rated heating temperature of 121 degrees Celsius.

The heating element is the heat of the fan, as can be clearly seen in the photograph, it is made in the form of a spiral, nichrome is used as a material.

When replacing the heating element, the following is taken into account:

resistance of heating elements;
power of heating element.

Diagnostics for the electric motor circuit of the fan heat is carried out taking into account the resistance measurement:

stator windings;
rotor windings

and detailed information on diagnostics of an electric motor can be found in this website.

Heat guns are designed for continuous operation for a long time, and, like any equipment for continuous operation, they require periodic maintenance and repair. Heat gun maintenance consists in cleaning them and adjusting parameters such as: air flap clearance, compressor pressure, fuel pump pressure, etc. A heat gun repair is to find faulty parts and replace them.

Consider, for example, a Master BV 110 E heat gun. This is an indirectly heated diesel heat gun with electronic flame control.

The basic structure of such a gun is quite simple. The fuel is supplied by the fuel pump to the injector, where it is sprayed into the combustion chamber. In front of the nozzle, there are two electrodes that ignite the fuel. Also, air is blown into the combustion chamber by a fan. If the gun is indirectly heated, then the combustion chamber has two independent circuits, which makes it possible not to mix heated air with combustion products.

The maintenance process of a diesel heat gun consists in cleaning the following components: fan, ignition electrodes, nozzle and diffuser and combustion chamber.

Let's transgress. Remove the cover from the back and front.

Now we have access to the fan and the rear grille. To get to the injector, we disconnect from the combustion chamber: 2 wires of the ignition electrodes (red), a photo sensor (black), a fuel line (copper tube), as well as 2 wires each from the thermal sensors on the combustion chamber. All wires are disconnected by hand, only a key is needed for the fuel line.

To remove the combustion chamber, you need to unscrew one screw in the lower front of the housing.

To remove the unit with the nozzle and diffuser, you need to unscrew the two nuts on the rear end of the combustion chamber.

Now you need to thoroughly clean the nozzle, electrode and diffuser.

The combustion chamber is non-separable, but it can also be well cleaned of soot using a compressor.

After cleaning the heat gun, it is also necessary to set the required gaps between the electrodes, as well as the gap of the air damper into the combustion chamber.

Everything. This completes the service.

When repairing heat guns of this type, the main task is to find faulty parts. What can be both an easy task, if the breakdown is of a mechanical nature, or rather nontrivial, for example, in case of malfunctions of the flame keeping system, you have to check all the elements of the control system step by step.

After identifying the faulty part, it remains to find it in the detailing and order.

Finally, a link to the channel with small videos about the repair of Master heat guns.

Before you start repairing heat guns, you should study the theoretical part of the heat gun process - a good way to heat a room, currently there are both diesel and gas guns. Why does the pump smoke, does the gun heat up poorly, and why does the fuel go away too quickly? Maybe you need to clean the nozzle or replace it completely? Is the electromagnetic pump broken? Frequent breakdowns can be caused by various factors, which depend both on the mode of operation of the gun and on the quality of the fuel and parts. Instead of giving money for simple repairs, you can first try to fix the unit yourself.

Repairing a diesel installation can be quite expensive, diagnostics alone can cost more than one thousand rubles. Many users cope with the breakdown on their own by disassembling the gun.

There are several reasons for the breakdown of diesel guns:

There is a problem with the valve spring - for example, it flew off and therefore the valve is constantly closed, without air flow into the chamber, because of this, the diesel gun stalls.
Broken fan wire when there is no warm air movement. First you need to strip the terminals, inspect the motor winding using a tester. Check winding insulation.However, in most cases, it is easier not to repair the diesel cannon yourself, but simply to buy a new engine.
It may be necessary to change the injectors. A lot depends on this part - it distributes fuel in the combustion chamber, that is, ensures the correct operation of the entire gun. However, nozzles rarely break, but if this happens, then it is easy to buy and replace this part, they are sold in any heat gun store.
There is no fuel supply to the injectors due to clogged filter. To repair it, open the body of the gun, open the plug, take out the filter and rinse it with kerosene. Dry and reinstall.

If you do not have experience in repairing diesel guns, then it is better to seek professional help.

It is important to find the cause of the breakdown and correctly carry out the repair yourself. Buy the necessary parts and replace them; in most cases, repairing a diesel gun can be done by hand.

Most often, the fan breaks down in diesel heat guns, because it is he who wears out the fastest.

This happens for the following reasons:

Insulation melts or burns out quite often. In this situation, the wires should be changed. However, if the wire is completely worn out or it was damaged mechanically, then the fan will have to be replaced.
Most diesel heat guns are equipped with low-power fans, so it can be easily replaced if necessary, because this part is available in any gun equipment store.
You need to choose a fan based on the performance of the gun.
You can replace the fan either yourself or, if you are unsure of your own abilities, call the master.

Any breakdown of a diesel cannon can be repaired without calling a master, most often you just need to buy and install a new part. Of course, each heating installation requires a special approach, but if you find time for repairs, you can do everything yourself.

In a gas cannon, the most common parts that break down are: the blower fan; piezoelectric element for gas combustion; control and protective units; fuel supply device. There are several ways to repair a gas cannon yourself.

Problems are as follows:

Gas does not burn. Usually the problem is in the piezoelectric element. Cleaning the igniter and setting the gap between the electrodes can help. If this does not correct the situation, then you need to install a new piezoelectric element.
When gas is connected to the cannon, but does not directly enter the chamber. The main cause of this problem is burner clogging. It should be cleaned using a compressor, that is, a powerful jet of air.
Smell of carbon monoxide. This problem occurs when there is a leak in the gas hose. This can be eliminated by tightening the fastening clamps or cutting off the ends of the hose. If the smell persists after that, then it is best to buy and install new main hoses. To find the exact location of the gas leak, you should soap your hands and bring them to the hose - where the gas flows out, soap bubbles will inflate.

The gas cannon shuts down by itself. The most common cause of this problem is a breakdown of the electronic gas control valve. There is only one way out - a complete replacement of the part.

The cannon works as usual, but the gas is escaping much faster. In this case, the gearbox has broken down, the most correct solution to the problems would be a complete replacement of this element.

You can disassemble the gas cannon using ordinary tools.

The burner is on, but no heat is felt. The problem is in the fan - first of all, the wiring is checked, if no faults are found, then you will need to buy a new fan and install it instead of the old one. It is not difficult to repair a gas cannon at home. However, most often, defective elements should simply be replaced with new ones.

Malfunctions of a diesel heat gun are also such - fuel unevenly enters the combustion chamber.Most often, the problem is associated with a clogged fuel tank. In this case, thorough flushing of the fuel tank and its supply system to the chamber can help. Before flushing, you need to drain all the fuel, and then purge the entire system and refill the fuel.

Fuel does not ignite. Spark plug defects can cause this problem. To fix this, you need to pull out the candle and clean it mechanically, create a gap between the electrodes.

The diesel cannon works intermittently. The most common cause of malfunction is a clogged air filter. Only a new filter, which must be bought and stopped, will help in this situation.

The heat exchanger does not heat up well, the fire in the combustion chamber is small:

You should look at the nozzle, most likely it is clogged.
You can clean it yourself by flushing it from dirt, and then thoroughly blowing it with a powerful jet of air.
If it still doesn't light up, master will help.

The gun gets very hot during operation. The most common problem is the thermostat. The defect can be eliminated by cleaning the thermostat parts or completely replacing them with new ones. The heat gun can be easily repaired at home if the cause of the breakdown is correctly identified. For the procedure, you don't even need special tools or skills.

This heating unit is currently available to everyone, but they often break. I don't want to pay several thousand for repairs by calling the master, so you can try to fix the problems yourself. Many guns require a simple temperature control, a thermocouple. With good fuel, the gun starts up and works normally, but do not forget about the timely cleaning of the unit parts.

Heat guns are one of the most effective types of equipment for space heating.

And this is not surprising: after all, with the help of these heating units, you can heat a room in a fairly short period, even large ones.

This is achieved due to the fact that the principle of operation of heat guns is as follows: heat is generated in the structural unit of the unit, and then, with the help of a powerful air flow, is supplied to a given place.

The uniqueness of the principle of operation of heat guns has led to the fact that recently equipment of this type has begun to be used quite often to achieve various industrial and domestic purposes. In other words, heat guns have gained extraordinary popularity due to their technical characteristics and ease of use.

But everyone probably knows that no matter how high-quality and efficient the equipment is, sooner or later failures occur in its functioning and malfunctions may occur. In such situations, the owners of heat guns, as a rule, contact specialized service centers.

However, there is another approach for identifying and eliminating defects in the operation of heating units of this type, which lies in the fact that the repair of a heat gun can be done by hand. Therefore, this article will be devoted to how to correctly find out and troubleshoot the operation of gas and diesel heat guns.

Most often, the following structural elements can fail in a gas heat gun:

blower fan;
piezoelectric element for gas ignition;
control and protective units;
fuel supply device.

Therefore, below we will indicate what malfunctions may arise in the operation of gas heating units, as well as how they can be eliminated with our own hands:

Gas does not ignite. In this situation, as a rule, the piezoelectric element has failed. It is recommended to clean the igniter and set the gap between the electrodes. And if the problem is not solved, then it is necessary to completely replace the piezoelectric element.
Gas is connected to the heat gun, but does not enter the combustion chamber. The cause of this malfunction is a clogged burner.It is recommended to clean this element with a compressor, in other words, you need to blow through the burner with a powerful jet of air.
There is an unpleasant smell of carbon monoxide. As a rule, the appearance of this malfunction is due to the fact that a leak has appeared in the gas hoses. Therefore, in order to eliminate this defect, it is necessary to tighten the fastening clamps or cut off the ends of the hose. If this procedure does not help, then these line hoses must be replaced.

You can read an overview of suitable heat guns for a garage in this article.

Diesel heat gun malfunctions consist of the following important points:

Fuel is supplied to the combustion chamber intermittently. The appearance of this defect is primarily associated with contamination of the fuel tank and its supply system. In this case, it is recommended to drain the fuel from the tank and rinse thoroughly. Then it is necessary to purge the entire fuel system.
The fuel mixture is non-flammable. This failure is primarily associated with spark plug defects. To eliminate the malfunction, it is necessary to remove the plug, clean it mechanically, and also adjust the gap between the electrodes of this ignition element.
The heat gun began to work intermittently. This type of malfunction is associated with a clogged air filter. In such a situation, a new filter must be installed.
The heat exchanger does not heat up well due to a small flame in the combustion chamber. This defect is due to the fact that the nozzle is heavily soiled. In this case, cleaning occurs in a non-mechanical way. In other words, the nozzle is thoroughly flushed and then purged with a compressor.
The heat gun overheats during operation. This malfunction occurred because the thermostat was out of order. To eliminate the defect, you need to clean all the elements of the thermostat or, if necessary, replace them with new ones.

In conclusion, we want to wish you that your heat gun never breaks down, and if such a nuisance did happen, then following our recommendations, you can easily identify all the defects and feel free to carry out repairs yourself.

Watch a video in which an experienced user clearly demonstrates the process of repairing a gas heat gun with his own hands:

These products are used to heat private garages, service stations, utility and storage facilities, construction sites - where people do not live. In the event of a breakdown of diesel heat guns, it is quite possible to independently diagnose, establish the cause of the breakdown and repair the unit.Such guns are often called fan heaters due to the similarity of the principle of operation, but they have certain differences. They work in the same way as other similar products: air flows around the combustion chamber housing with a fan and heats the room.The principle of operation of the heat gunThe design of modern guns includes a special sensor that turns off the device when the set temperature is reached, thus achieving significant fuel savings. Garage craftsmen make guns that can run on different grades of used oil.Factory or homemade, heaters have several very vulnerabilitiesso they need frequent repairs. This is cleaning nozzles and filters, replacing the fan and much more. To find out all the vulnerabilities, you need to study the design of such guns.Important advice! After using the gun and setting it for long-term storage, the remaining fuel must be drained, and the tank must be thoroughly rinsed from the remaining diesel fuel. It is unsafe for the product to use fuels that have been stored for a long time.Products with indirect heating method premises have chimneys through which all combustion products are removed, so in practice they can be used to heat living quarters. They are much safer, but they use oxygen for combustion, so ventilation or periodic ventilation is needed.Their power is lower, because losses occur through the exhaust system.Diesel heat gun deviceThe product direct heating all combustion products remain in the room, so they cannot be used where people live permanently. They are used to heat construction sites and warehouses where there is a natural flow of air, because lack of ventilation can lead to carbon monoxide poisoning.All products are equipped with powerful body made of metal: it excludes the ingress of foreign objects that can cause damage or become a source of fire. Necessarily installed fuse, which turns off the device when the case is very hot.For circulation, use a compressor or a small pump, for pumping into the room - fan, which experts consider one of the vulnerabilities of these products. A burner and a fuel supply pipeline are located inside the housing.The main elements of a diesel heat gun:

there is an exhaust pipe for removing smoke;

a fuel tank located at the bottom of the product;

pump or compressor driven by an electric motor.

The repair of a diesel installation can cost a user a lot, because only diagnostics cost from 1000 rubles, depending on the model. Many car enthusiasts cope on their own, diagnosing empirically or following the standard path from a simple failure to a complex case. Sometimes there are options when the product does not work normally just because it jumped off valve spring, it remains permanently closed - there is no air flow into the combustion chamber. As a result, the cannon also stalls.This breakdown is determined simply - there is no movement of warm air. We begin a visual inspection of the motor: first, we will clean the terminals, then we will ring the motor winding using an analog tester. We also check the insulation of the winding. In some cases, in order not to waste time, it is easier to install new enginethan testing the old one.This is a very important detail: the functionality of the entire product depends on its high-quality work, because it sprays diesel fuel in the combustion chamber, thereby ensuring complete combustion of the fuel. Injectors rarely fail, and these spare parts for diesel devices can be purchased at any heat gun store.Sometimes the diesel cannon stops working because there is no fuel supply to the injectors due to a clogged filter. We open the case of the device, unscrew the plug, take out the filter element and rinse it in a clean kerosene... Then it can be blown off with compressed air and installed in place.According to the statistics of all malfunctions, the fan often fails - it is he who undergoes intensive wear during the operation of the product. Reflow occurs insulation wiring or its burnout: in this case, it is not difficult to change the wires, but if mechanical stress or extreme wear is detected, then in this case the fan must be replaced.Mostly heat guns are equipped with fans low power, so it's not difficult to find a replacement for them - just visit a specialized store and choose a product based on the performance of your device.The user must remember that all encountered failures require an individual approach, but there is nothing super complicated in the details of a diesel gun. Therefore, repairing a heat gun with your own hands is subject to any home craftsman - you just need to have the desire and a little free time.

Heat guns Master are among the most reliable, safe, economical and efficient mobile heaters. Due to their design, they heat the air to the desired temperature in a short time, therefore they are widely used for heating industrial and residential premises, including loggias and balconies. They help maintain optimal temperatures in your garage, pantry or greenhouse. In addition, mobile air heaters are actively used in construction and repair work.

No matter how reliable these heat generators are, over time they, like any other devices, wear out and sometimes fail. Heat gun repair Master requires high qualifications of the master. Otherwise, the service life of the equipment may be significantly reduced. Therefore, this serious matter should be entrusted only to highly qualified specialists working in a reliable service center specializing in the repair of electric, gas and diesel heaters. Only in this case, you can be completely sure that the repair work will be carried out quickly and using high-quality parts. In the service center, the client is provided with a guarantee for all types of repair work.

The most common reason for equipment failure is violation of the rules for its operation. The expiration of this or that part also leads to a breakdown of the heat generator. Repair of Master diesel heat guns required for:

clogging of the nozzle through which the fuel flows;
dimming the glass of the combustion sensor;
non-ignition of the combustible mixture when turned on;
unreasonable actuation of the control system automation, and so on.

Electric heat guns often break down due to poor power quality. Unstable voltage leads, in particular, to damage to the control system. Heating elements - heating elements - may fail, as a result of which the air will not heat up, although the engine will continue to pump it.

The service center specialists will carry out a thorough diagnostics, establish the causes of the malfunction and make cannon repair Master in the shortest possible time. It should be remembered that the guarantee of uninterrupted operation of heating heaters is pre-season maintenance and timely scheduled preventive maintenance. Therefore, it is recommended to contact the service center in advance, and not when a serious breakdown occurs.

We repair MASTER guns of all models and modifications, including such models as:

Diesel cannons Master direct heating:

Diesel guns Master indirect heating:

Diesel infrared guns Master:

Electric heaters Master:

by admin Published 08/22/2016 Updated 03/21/2017

Heat guns by their principle of operation are powerful fan heaters equipped with a set of protective and control units. The cost of these devices cannot be called low, therefore, maintenance and repair of heat guns will also cost a considerable amount.The best way out in the event of a malfunction in the heat gun is to repair it by the specialists of the service center, but to save money, you can try to make it yourself. To carry out repair work, there is a proven scheme - an algorithm of actions that any repair specialist should follow. Let's try to compile a list of actions that will bring your heat gun to life at minimal cost.

Actually, repair of fan heaters is not so difficult, and it should start with the observance of basic safety measures. Since almost any gun has a fan, regardless of the type of energy consumed by the device, it should be remembered that electric current is dangerous to human life. Any repairs to the heat gun, even without dismantling the protective casing, must be carried out with the voltage disconnected (the power cord is not connected to the mains). When checking the operability of the electrical power circuit, it is allowed to supply voltage to the device, but measurements should be made with insulated probes or a tool, while avoiding contact of live parts with open skin areas.

Repair of an electric heat gun, or the electrical part of any other gun, should begin with checking the integrity of the power circuit, which in its simplest version consists of a power cord, a power switch, electric heaters (TEN), a fan motor mode switch or heaters (if such a switch available) and engine. To check the continuity of the circuit, it is necessary to ring the following nodes with an ohmmeter (digital or pointer multimeter that measures resistance):

Except electrical fault a gas or diesel cannon can cause damage to the fuel systems, which you can also try to fix yourself. Repair of a gas or diesel heat gun can be done by eliminating the following faults:

After repair of the device must be correctly and efficiently assembled... The duration of the subsequent uninterrupted operation of the heat gun depends on the build quality.

One of the most common reasons newly acquired diesel heat guns, both direct and indirect, fail to start is insufficient spark plug contact. This is due to the fact that during transportation, for some reason, the antennae unclenched, and the spark does not pass between them. To fix the problem, you should call specialists, but if you still decide to fix the gun yourself, then disassemble the case and get to the ignition unit, check the distance between the antennae and move them by 3-4 mm if necessary.

The next possible cause of malfunctions in the operation of heat guns that were in operation is the darkening of the glass of the combustion sensor. It is a light-sensitive sensor that reacts to the appearance / absence of light. It can be wiped off and the cannon will work again.

A clogged nozzle can also cause failure of diesel heat guns. ATTENTION The nozzles must not be mechanically cleaned!

If the equipment has not started, then call specialists - probably the breakdown is more serious and you cannot cope with it on your own.

The need to quickly heat up a large or small room is not so rare. Sometimes you need to heat a garage, dry a cement wall, warm up a cellar, a shed, a garden house, a summer cottage, etc. In this case, a do-it-yourself heat gun may be the best solution. It is not so difficult to make such a device, while you can choose the appropriate type of fuel: electricity, diesel fuel, liquefied gas in cylinders, etc.

It is difficult to name a more convenient and simple device for heating premises than a heat gun. It is a powerful heating element and a fan enclosed in one housing.Such a device heats up the air and quickly distributes it throughout the room. It will take a few minutes to warm up a small room, and heating a large room will not take too long.

The body of the heat gun must be closed on both sides with gratings that will freely allow air to pass through. It is a must for all industrial models.

The design of a heat gun is very simple, so a properly manufactured device almost never breaks down. Various fuels can be used to operate the device:

electricity;
liquefied gas;
diesel fuel;
kerosene;
gasoline, etc.

The efficiency of the heat gun depends on the power of the device. For domestic use, a device with a capacity of 2-10 kW is quite suitable. For large rooms, you will need a 200-300 kW heat gun.

An electric heat gun is perhaps the simplest and safest heater option. If the site has access to electricity, just such a unit should be made. It will be useful both during construction work and later, for various household needs both in the house and on the site.

To make an electric heat gun you will need:

the frame on which the structure will rest;
metal case;
heating element (heating element);
fan with an electric motor;
switch or control panel;
cable for connecting the device to the mains.

The body of the heat gun can be made from a suitable length of pipe or from a sheet of galvanized iron. For work, you will need a metal tool and, possibly, a welding machine. This device received the name "cannon" because of the similarity of its cylindrical body with an old weapon. However, the heater body may also have a square or rectangular cross section if easier to manufacture.

Please note that the body of the product may become quite hot during operation. You should choose a heat-resistant or thick enough metal for the case. In addition, it makes sense to apply a heat-insulating coating to its metal parts.

When choosing a suitable heating element and a fan, it should be remembered that the heating temperature depends on the power and the number of heating elements. The fan speed does not affect the amount of heat, but the higher it is, the more evenly the generated heat will spread throughout the room. Thus, the heating element is responsible for the heating temperature, and the fan speed is responsible for the quality.

To reduce costs, the heating element can be removed from an old iron or other household appliance. Sometimes it makes sense to shorten the heating element to increase the heating temperature. A suitable impeller motor can be found in older vacuum cleaner models.

To assemble an electric heat gun correctly, it is recommended to first draw up a diagram of the electrical circuit of the device. You can use a ready-made scheme, one of the options is presented below:

For the correct installation of an electric heat gun, before starting work, it is recommended to draw up an electrical diagram, reflecting on it the connection of all elements to the mains

The electric heat gun should be assembled in this order:

Prepare housing and support.
Install heating elements (or several heating elements) in the center of the case.
Lead a power cable to the heating elements.
Install the fan and supply power to it
Lead the power wire, wiring from the heating elements and the fan to the control panel.
Place protective grilles on the front and rear of the enclosure.

All electrical connections must be carefully insulated during assembly. At the end of the assembly, a test run of the device is made. If it works without fail, you can use the gun as intended.

Where access to electricity is limited or impossible, diesel heaters are often used.It is somewhat more difficult to make such a heat gun by yourself than an electric model. You will need to make two cases and work with a welding machine.

The bottom of the diesel heat gun is the fuel tank. The device itself is placed on top, in which the combustion chamber and the fan are connected. Fuel is fed into the combustion chamber and a fan blows hot air into the room. To transport and ignite fuel, you need a connecting pipe, a fuel pump, a filter and a nozzle. An electric motor is attached to the fan.

The combustion chamber is mounted in the center of the upper housing of the heat gun. It is a metal cylinder, the diameter of which should be approximately half the diameter of the body. Diesel fuel combustion products are removed from the chamber through a vertical pipe. To warm up a room with an area of about 600 sq. m may require up to 10 liters of fuel.

The lower body must be at least 15 cm away from the top. To prevent the fuel tank from overheating, it should be made of a material with low thermal conductivity. You can also use an ordinary metal tank, which will have to be covered with a layer of heat-insulating material.

The diagram clearly shows the device of a heat gun that runs on diesel fuel. The device should be secured to a sturdy, stable frame.

The upper body should be made of thick metal, this can be a suitable length of a wide steel pipe. It is necessary to fix in the case:

combustion chamber with vertical outlet;
fuel pump with nozzle;
fan with electric motor.

Then a fuel pump is installed, and a metal pipe is removed from the tank, through which fuel is supplied first to the fuel filter and then to the nozzle in the combustion chamber. The upper body is closed from the ends with protective nets. The power supply for the fan will have to be taken care of separately. If there is no access to the mains, use the battery.

It is important to adhere to safety regulations when using a diesel heat gun. Even at a distance of a meter from the case, the directed flow of hot air can reach 300 degrees. It is not recommended to use this device in enclosed spaces, as the combustion products of diesel fuel may pose a health hazard.

In addition to a unit that runs on diesel fuel, other types of liquid combustible materials are also used for heat guns, for example, used engine oil. An interesting version of such a device for testing is presented in the following video:

The design of a gas heat gun is in many ways similar to that of a diesel unit. There is also a combustion chamber built into the body. Instead of a liquid fuel tank, a liquefied gas cylinder is used.

As with the use of diesel fuel, the removal of combustion products is of great importance, since it is impossible to ensure complete combustion of the gas in home-made devices. The air that enters the room heats up when it comes into contact with the combustion chamber. Exhaust gases leave the device through an outlet connected to the street. This indirect heating system is safer than open flame heating.

Heat guns of indirect heating are equipped with a closed combustion chamber that prevents contact between open fire and air - this design is more complicated, but safer than direct heating models

To increase heat transfer, longitudinal plates can be welded to the body of the combustion chamber, usually 4-8 pieces of them are made. In this case, the dimensions of the combustion chamber with additional plates must be less than the diameter of the body so that the chamber does not touch its walls and does not overheat the body of the heat gun.

The body of a gas-fired heat gun gets very hot during operation, so it must be covered with a layer of thermal insulation to avoid possible burns or fire.

To create a gas heat gun, you will need the following elements:

liquefied gas cylinder;
burner;
reducer;
metal case;
fan;
device for remote ignition;
frame for fixing the case.

The gas cylinder is connected to a reducer, which ensures a uniform supply of fuel to the burner. The air around the combustion chamber heats up, the fan blows it into the room. The procedure is practically the same as for the manufacture of a diesel heat gun. The device of a gas heater is clearly shown in the diagram:

This diagram clearly demonstrates the design of a heat gun that runs on liquefied domestic gas. The fan must be powered

With a gas heat gun, use only cylinders that are filled with gas on professional equipment. Cylinders filled with artisanal methods may leak

During the manufacture and operation of a gas heat gun, it is recommended to adhere to the following rules:

The gas supply pipes at the joints must be carefully sealed.
It is imperative to install a remote ignition device, as manual ignition can lead to an explosion.
Make sure that the gas cylinder is always at a sufficient distance from the heater, otherwise the cylinder will overheat and the gas will explode.
Never use homemade cylinders with a gas cannon.
Do not leave the operating device unattended for a long time.

Video (click to play).

Another important point is the ratio of the power of the gas cannon and the size of the heated room. Do not use an overly powerful device in a small room, as this can easily lead to a fire.