Electrolux SAHARA User manual

DRYERS

Condense / Heat Pump Tumble Dryers - DISASSEMBLY

Publication number: 599 796-724

Edition: 08/2019 - Rev.0.2

Customer Care - EMEA

Training and Operations Support

Technical Support

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Technical Support MP 599 796-724 Rev.0.2

PRECAUTION

1PRECAUTION

Information

“Safety”

All the work to be performed inside the appliance requires

specific skills and knowledge and may only be carried out

by qualified and authorised Service Engineers

Due to the safety precautions it is forbidden to repair

basements filled up with Propane R290. Only a replacement

of the whole basement is permitted.

This platform is not fitted with an ON/OFF switch. Before you

access internal components, take the plug out of the socket

to disconnect the power supply.

Some of the components in the mechanical part could

cause injuries, so wear suitable protection and proceed with

caution

Always empty all the water from the condensation tank

before laying the appliance on its side.

If the appliance has to be placed on its side for

maintenance or another reason, lie it on its left side, to avoid

the risk of any residual water falling onto the main circuit

board.

Document Revisions

Revision

Date

Description

0.0

03/2016

Document creation

0.1

03/2017

Added: Steam generator tank with cover;

POne control panel and board; plastic “SAN”

door; POne kick plate panel

0.2

08/2019

Added: Safety information; spare parts for

Propane; Optiflow basement R290

2PURPOSE OF THIS MANUAL

The purpose of this Service Manual is to provide Service Engineers who

are already familiar with the repair procedures with information

regarding: Condense / Heat Pump Tumble dryers

based on SAHARA and OPTIFLOW structures

fitted with EDR10, EDR11,EDR12,EDR14 EU,EDR16 electronic control

systems.

The manual deals with the following topics:

oDrying circuit.

oTechnical and functional characteristics

oAccess

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Technical Support MP 599 796-724 Rev.0.2

CONTENTS

3CONTENTS

1PRECAUTION 1

2PURPOSE OF THIS MANUAL 1

3CONTENTS 2

4OPERATING PRINCIPLE 3

5FUNCTIONAL PARTS 10

6ELECTRICAL EQUIPMENT 13

7DRYER 23

8HOUSING 25

9DISASSEMBLY 26

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Technical Support MP 599 796-724 Rev.0.2

OPERATING PRINCIPLE

4OPERATING PRINCIPLE

4.1 OPERATING PRINCIPLE

Condense drying system

Heat Pump drying system

100% Energy

consumption

Water

pump

Condenser

100%

Energy

input

Water tank

Air flow

Cooling air

Heating

element

of which

50% Energy

is recovered

Water

pump

Condenser

(Heat generator)

Expansion

valve

Evaporator

(Heat exchanger)

60%

Energy

input

Water tank

Air flow

Refrigerant

flow

Compressor

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Technical Support MP 599 796-724 Rev.0.2

OPERATING PRINCIPLE

4.2 CONDENSE DRYERS - DRYING CIRCUIT

There are two air groups inside the appliance:

•One hot one closed in on itself inside the appliance;

•One open cold one, for the circulation of ambient air through the condenser.

The first air group, which is hot and closed in on itself, circulates inside the appliance:

The fan (1) pushes air inside the heat exchanger (5), and from this via the heater unit (2), the air

heats up and via a conveyor enters inside the drum passing through the holes in the back panel.

The warm dry air moves through the laundry moving in the drum removing the dampness and

transforming it into warm damp air; this exits from the front part of the drum through the fluff filter

(3) and the lower filter (4), and is then channelled through the conduit to the fan (1); from here it is

pushed inside the heat exchanger (5) where dampness is condensed. When this comes out, we

have dry air and the cycle continues as described above.

The second air group, the one circulating ambient air through the condenser:

The fan (6) takes in ambient air through an air inlet in the back panel, pushing it into the heat

exchanger (5), and cooling it. The air comes out on the opposite side of the exchanger,

dispersing inside the appliance and coming out of the slots in the kick plate.

The two air groups, the damp hot one and the cold one cross over in the heat exchanger (5),

producing heat exchange and, therefore, condensation of the humidity.

The condensation water that forms inside the exchanger is collected in a trap (7) where there is a

float (9) that informs the circuit board that water is present, so the circuit board powers a pump

(11) which conducts the water from the trap (7) to the tank (8).

The tank was designed to collect the condensation water of a complete cycle with a full load, so

approximately 5.5 litres.

If for any reason the tank is filled beyond its capacity, any overflowing water is collected by the

tank support and channelled along a pipe (not shown in the diagram) back inside the trap (7),

moving the float (9) up, and thus activating the micro switch (10). The electronic control unit

makes 7 attempts to empty the trap in specific amount of time, after which the electronic control

unit recognizes the problem and cuts off the electricity supply to the appliance and lights a LED

to inform the user that the tank is full.

Operating principle

Hot air fan

Heater unit

Fluff filter

Heat exchanger

Cold air fan

Condensation collection tray

Condensation collection tank

Float device

10.

Micro switch

11.

Condensation water suction pump

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Technical Support MP 599 796-724 Rev.0.2

OPERATING PRINCIPLE

4.3 HEAT PUMP DRYERS - DRYING CIRCUIT

Operating principle

Operating principle with auxiliary condenser

Operating principle with steam generator

Evaporator

Condenser

Drum

Condensation collection tray

Condensation collection tank

Compressor

Air circulation fan

Capillary tube

NTC sensor

10.

Compressor cooling fan

11.

Condensation water suction pump

12.

Auxiliary condenser

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Technical Support MP 599 796-724 Rev.0.2

OPERATING PRINCIPLE

The cycle of the tumble dryer heat pump consists in evaporating, compressing, condensing and expanding the refrigerant.

By pressing the START/PAUSE button the drying cycle begins, the gas in the circuit is conveyed by the compressor (6) to the condenser (2), where at the

outlet the circulation pipe known as capillary (8) narrows. This capillary slows down the release of gas and ensures that the pressure inside the condenser

(2) increases bringing the gas to a liquid status and a pressure level of around 27 bar.

This rise in pressure subsequently increases the temperature of the gas that is now liquid inside the condenser (2) reaching around 53°C.

The air circulated by the fan (7) passes through this condenser (2) overheating before entering the drum (3) where the washing is located.

The evaporator (1) is located at the capillary outlet (8) with the gas circulation pipe being larger than the capillary which thus expands the hot, liquid gas

coming from the condenser (2).

This gas expansion means that the gas in its liquid state once again becomes a gaseous state causing the gas itself to cool and subsequently cooling the

entire evaporator, bringing it to a temperature of around 20°C.

The, by now hot air is circulated by the fan (6) and passes through the washing in the drum (3) absorbing humidity and reaches the evaporator (1) humid

and hot. The latter which is now at a lower temperature thanks to the expansion of the gas ensures that all the humidity in the circulating air condenses.

The condensed water created is collected in a tray (4) and conveyed via a pump to the tank (5) located above the drum.

At this point, the air is now cold and dry and goes through the condenser (2) again, once again overheating before entering the drum (3) and the gas now

cooled in the evaporator (1) returns to the compressor where it will once again be compressed and sent into the condenser (2) re-starting the cycle.

The entire gas evaporating and compressing system is kept in balance by a NTC (9) located at the entrance to the capillary (8). This collaboration with the

main circuit board ensures that if the outgoing temperature from the condenser surpasses a certain level a fan (10) located in front of the compressor starts

working and lowers the temperature.

In the models with auxiliary condenser, the operating principle remains the same and the only single variant is in the auxiliary condenser positioned in

series to the main condenser. This ensures that the whole system is better balanced, thus increasing performance.

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Technical Support MP 599 796-724 Rev.0.2

OPERATING PRINCIPLE

4.4 STEAM GENERATOR PRINCIPLE

These appliances are fitted with a steam generator comprising a pulse-powered miniature boiler

(6) and a pump (5) which is necessary to fill the boiler.

If you wish to use the IRON AID programmes, you first need to fill the tank (1) with distilled water

through the filling inlet up to the MAX level of approximately 0.9 litres, or if a drying cycle has

already been carried out, it is filled automatically through the condensation water filling pump.

This allows the float (3) to move away from the magnetic sensor (2) and therefore cancel the

alarm shown on the display.

As soon the drying cycle has ended, the membrane pump (5), which also acts as a non-return

steam valve, begins to draw water through the pipe and pump it into the boiler (6). The water

that has heated turns into steam and travels up the pipe, and it is then introduced into the drum

through the nozzle (7).

The quantity of steam that can be selected using this button varies the amount of time for which

the pump and boiler remain in operation.

STEAM GENERATOR TANK

- Version with cover 1. Tank fixing points

2. Overflow outlet

3. Water outlet towards the

boiler

4. Water inlet connector from

the condensation trap

5. Water filling assembly and

tank connector

6. Lint filter

7. Float with magnet

8. LED light and level sensor

board

9. Sensor cover

Operating principle

Distilled water tray

Level sensor

Float

Manual fill tank

Membrane pump

Boiler

Steam outlet nozzle

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Technical Support MP 599 796-724 Rev.0.2

OPERATING PRINCIPLE

4.5 WATER CIRCUIT – CONDENSE / HEAT PUMP

The condensation water that forms inside the exchanger is

collected in a trap.

There is a float (5) inside this trap that informs the circuit board

that there is water. This powers a pump (1) which conveys the

water through the red pipe (2) from the trap to the tank

inserted in the tank support (4).

The tank was designed to receive the condensation water of a

complete cycle at full load, approximately 5.5 litres.

If, for whatever reason, the tank fills up beyond its capacity,

the overflowing water is collected by the support tank and via

the transparent pipe (3), is re-conveyed inside the trap

pushing the float (5) upwards and this activates the micro-

switch. The electronic makes 7 attempts to empty the trap

within a set time, after which the electronic control recognises

the problem and disconnects the power supply to the

appliance and lights up a LED informing the user that the tank

is full.

Condense

Heat Pump

1. Pump immersed in the trap.

2. Tank water drain pipe (red).

3. Water overflow drain pipe (transparent).

4. Tank support.

5. Level sensor.

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Technical Support MP 599 796-724 Rev.0.2

OPERATING PRINCIPLE

4.6 WATER CIRCUIT – HEAT PUMP WITH STEAM GENERATOR

The condensation water that forms inside the exchanger is

collected in a trap.

There is a float inside this trap that informs the circuit board

that there is water. This powers a pump which conveys the

water along a pipe (1) from the trap to the main tank; at one

point the water from the pump comes to a fork and so one

part is shunted along the pipe (2) to the collection tank

necessary for the steam generator (3).

Before entering this tank, the water is filtered by the filter

present in the manual water filling assembly (7).

The excess water obtained when the drying cycle has not

ended yet and the steam generator tank is full is channelled

along the overflow pipe (4) towards the trap and from there,

the pump recycles it. The main tank was designed to collect

the condensation water of a complete cycle with a full load, so

approximately 5.5 litres.

If for some reason the tank fills up beyond its capacity, the

overflowing water is collected by the tank support and is re-

conveyed inside the trap along the transparent pipe (12),

pushing the float upwards and thus activating the microswitch.

The electronics make 7 attempts to empty the trap within a set

time, after which if the float has not dropped the electronic

control recognises the problem and disconnects the power

supply to the appliance and lights up a LED informing the user

that the tank is full.

If you are using a cycle that uses steam, the water inside the

transparent tank (3) reaches the pump (8) along the pipe (6);

this pump, which also acts as a pulse powered non-return

valve, conveys the water to the boiler (9) where it turns into steam and travels along the pipe (10) and the nozzle (11) to the inside of the drum.

Heat Pump with Steam Generator

1. Condensation water filling pump from

the pump to the main tank.

2. Fork in the pipe originating from the

pump towards the main tank and the

steam generator tank.

3. Steam generator tank (transparent).

4. Overflow pipe.

5. Level sensor and LED lights.

6. Steam generator system water filling

pipe.

7. Manual water filling assembly and

filter.

8. Steam generator pump.

9. Steam generator boiler.

10. Steam pipe.

11. Steam outlet nozzle in the drum.

12. Main tank overflow pipe.

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