4 of 36
Service Manual UK
Indesit
Company
English
DRYER FUNCTION
Overview
This is a freestanding tumble dryer with a full width metal door.
The drum is capable of accepting a maximum 8 kg load. The drum is supported at the front by 2
wheels mounted on the front air duct and a single bearing at the rear located in the rear panel. A
shaft fixed to the rear of the drum runs in the rear bearing. The drum is driven by a belt which passes
around its periphery and onto the shaft of a motor secured to the base of the dryer.
The belt is tensioned by a pulley mounted to the motor.
The motor also drives a fan fixed to the end of the rear shaft to recirculate air through the drum.
The drum normally rotates clockwise with the occasional reverse action anticlockwise. This occurs
during the cycles cool down period and for 5 minutes every hour of the cycle duration.
The moisture removed from the recirculating air, by means of a refrigerant module, is pumped to a
removable container mounted in the left hand side of the console. The user can easily withdraw the
container to dispose of the collected condensed water. There is no requirement for venting to
atmosphere on this dryer.
Drying Process
The circulating air flows over the condenser unit causing it to be heated, the air then passes into the
drum via the fan chamber collecting moisture from the clothes enabling them to dry. The moisture
laden air passes through two filters to remove any lint and then passes through the evaporator unit
where the moisture condenses and falls into a channel in the base and flows into the pump reservoir
where it is pumped into the water container. The resulting cooled air aids the cooling of the
refrigerant in the condenser before starting the process again.
Heat Exchange Cycle
The Cycle begins with refrigerant being pumped by the compressor through the condenser unit.
A capillary tube is used to create a restriction to increase the pressure and temperature of the
refrigerant in the condenser, the heat (used to heat the airflow into the dryer) is removed from the
refrigerant converting it from a gas to a liquid.
The liquid refrigerant is then forced through the capillary under pressure into the evaporator unit
where the pressure is removed causing the refrigerant to evaporate into a gas again cooling the
evaporator the refrigerant then returns to the compressor to complete the cycle.
Controls Overview
The user interface controls consist of a Programme selection knob, a Digit display, option buttons;
Start/Pause button and an On/Off button.
The control system consists of a control module, two thermistors and a conductivity sensor.
The conductivity sensor is mounted in the front air duct. A single wire connects the sensor to the
control module. The front thermistor is located in the air duct, and the second thermistor is attached
to the heat exchanger system pipe work.
The control module determines the programme duration and dryness of the load. This is achieved
by the thermistors located in the front air duct and on system pipe work measuring the difference in
temperature / resistance between the two points, the control module then calculates and compares
the values to that of the chosen programme.
As the programme progresses a small DC current is passed from the sensor in the front air through
damp clothes to earth. The resistance of this current is compared to the resistance value of the
chosen programme and when these become equal the load will have reached the required level of
dryness and will then progress through the dry programme and on to the cool down period.
