Convection Electric driers: the pros and cons, operation

Electric driers kitchen - appliance for domestic use, designed to remove moisture from fruit and vegetable products, with the aim of further storage.

In the market of household appliances represented by two types of drying units for plant products:

- Infrared;

- convection.

Convective electric dryers are in high demand due to attractive prices.

How does a convection oven

Convective dryers are not only used for the procurement of products of plant origin, with the help of the unit zasushivat meat and fish.

Structurally Electric driers is a platform equipped with a heating element and removable trays for placing latticed sliced ​​products. Prepared and sliced ​​ingredients are placed on trays, lid closed, inside the body creates the necessary conditions for drying.

Evaporation of moisture from the product occurs under the action of the circulating hot air or superheated steam. The air temperature in convective drying reaches 80 FROM. In protrudes heater, natural circulation flow generated by the fan as a heating element.

The apparatus and characteristics

Design features elements of the device - a decisive factor when choosing a model. First and foremost when choosing pay attention to:

• body material and pallets;
• Electric driers capacity;
• power;
• method of administration;
• location of the heating element;
• Trays.

Material housing and removable trays

Electric driers housing and trays made of stainless steel or a food grade plastic. Plastic housing trays and easier to clean, easily washed out, such unit weighs less than steel. At the same time the plastic is exposed to mechanical damage, the plastic case or pallet can crack or break.

use translucent or opaque plastic material for the manufacture of structural members of convective electric dryers. The advantages of a metal housing - the strength, durability, but the cost of steel Electric driers above.

roominess

Capacity of Electric driers depends on the functional purpose machine. If you plan on harvesting for small families of products efficiently acquire mid-sized unit that can handle at one time up to 3 kg of product. Dimensional models can be dried at the same time up to 9 kg of fresh supplies.

Power

Power affects the drying product. In the market of modern appliances are models of convective elektrosushilok capacity from 165 to 1000 watts. Rational exponents consider the power of the drying unit 400-600 watts. Devices 600 watts or more shorten the drying time. Less powerful elektrosushilok - excessive noise during operation.

control method

electric dryer control for fruit and vegetable production takes place mechanically or electronically.

Advantages of electronic control:

• Process automation;
• hygiene (touch buttons exclude dirt).

However, e-government, in contrast to the manual often fails.

Location of the heating element

A significant selection criteria. Most models located at the top or bottom. When the vertical hot air supply, regardless of the location of the heating element, in the drying process is required to rearrange trays places for uniform processing of the product.

The market offers models with lateral (horizontal) position of the heating element, but they are not too common because of the increased size of the drying unit.

trays

Number of loading trays according to the model ranges from 2 to 8.

Choose a model kit which additionally includes trays for making jellies and pastes. This will expand the functionality. In the market of household appliances are models of electric kitchen dryers function of making yogurt and proofing.

What matters is the height of the pallet. The height of the tray to allow one centimeter dried berries, herbs or medicinal herbs. The height of the rim of 2 cm more practical and allow to dry whole mushrooms, slices of fruit.

functions

The presence of additional functions to simplify the process and to secure the dryer.

When you select a device for drying foods is desirable presence of such functionality:

• overheat protection;
• thermostat;
• timer;
• lighting;
• cooling.

The "thermal protection" Electric driers designed for disconnection in the case of accidental temperature rise. Favorably affects the service life of the unit.

Temperature controller sets the desired temperature regime for drying a product, as a consequence of the optimal conditions are provided for processing products. The thermostat has three temperature options:

"low" - processing products occurs at a temperature of 35-40⁰;

"average" - maximum temperature of the airflow 55⁰;

"tall" - heating temperature of 55 to 80⁰.

The "timer" It allows you to program the drying time. After a predetermined time the dryer is turned off automatically.

"Illumination" feature It allows to monitor the drying process without the need of opening the device lid.

"Cooling" function It provides for disabling the heating element and blower switch for actuating the final output condition, prevents product overdrying.

Pros and cons of a convection oven

The main advantage of a convection dryer for vegetables and fruit - the price. The advantages of this type can be attributed, and a variety of models, which are represented in the market of household appliances.

However, the list of shortcomings convective elektrosushilok in comparison with the devices whose operation is based on infrared radiation, is quite wide:

• increased drying time;
• high energy consumption;
• loss of the vitamins and minerals at high temperatures;
• change in appearance and flavor of the original;
• less time preservation of the dried products.

Disadvantages electric convection dryer is directly related to the principle of the device. During the convection evaporation of moisture occurs from the treated surface of the product, resulting in thus creating a film that prevents the hot air flows in the penetration deep into the product.

Operation convection oven

Before the operation should be familiar with the manufacturer's instructions.

Operating procedure

1. The unit is mounted on a flat, stable surface.
2. Prepared vegetables, fruits and other products for drying is placed on lattice trays. Do not overload the section between the slices should stay away for free circulation of hot air.
3. Loaded pallets are placed in drying.
4. The housing cover with a lid.
5. The device is connected to the mains.
6. Press the power button on the case.
7. With the thermostat set desired temperature.
8. Upon completion of the process of turning off the unit by pressing the corresponding button on the body.
9. Disconnected from the wall outlet.
10. After cooling, the dried product is unloaded pallets.
11. Rub trays and body soaked cloth, then wipe the parts dry.
12. Device harvested in a cool, dry place for storing.

Precautionary measures

During operation should observe basic safety precautions:

• used exclusively for its intended purpose;
• We can not allow children to an electrical appliance, as the current and hot steam could injure the child;
• Do not get water inside, on the power cord and plug;
• can not be used in the event of a fault;
• after the end of the drying process unit should be disconnected from the network.

malfunctions

In operation, an electric kitchen machine may encounter such breakdowns:

• dryer is not included;
• machine shutdown occurs periodically;
• At first glance the unit is running, but not dry.

Possible causes of the situation:

• fault power cord;
• overheating of the heating element;
• fault on / off button;
• Overload pallet production;
• mechanical damage to the apparatus;
• temperature regulator defect;
• a defect in the engine.

The corrective action necessary to determine the reasons of failure of the drying unit, first unit is inspected for mechanical damage to the enclosure and power supply cord.

Verification of mechanical on / off button of the domestic appliance is carried out by measuring the resistance ON and OFF position by the meter, thus the unit is disconnected from the power supply. When the position of the button the resistance value should be close to zero.

Electric driers Breakage may be caused due to the thermal fuse actuation of the heating element overheating. For diagnostic check bimetallic thermal fuse ability to conduct electrical current at different spatial positions housing. Verification of the element is carried out at room temperature.

When viewed from the executive units drive motor Dehydrators check the state of the contact pads of the armature in contact with the brushes. The contact areas must have a visual metallic luster may be slight wear. Contacts must be dry and liquid from entering unacceptable.

With correct operation of the motor brush smoothly slide on the surface of the contact pads, without jerks and delays in sections of sites. About the malfunction of the engine indicates a sizeable shaft runout in the bearings or in the bushes at the armature movement.

Diagnosis of the temperature control defects begin with a visual inspection of the thermostat on the lack of contact contamination, interrupting the power supply circuit. the thermostat is checked by external heating with temperature control.

The area of ​​contact between contacts when closed circuit must be maximized, the resistance parameters in the point of contact of less than 0.01 ohms. Upon reaching the desired temperature, the opening of the contacts.

If the skills and appliance repair experience is missing in case of trouble better contact a qualified service center.