How To Mini Split Ac Unit Repair

Split Airconditioner Control
Troubleshooting

Here are some basic split up airconditioner command troubleshooting guide that may help you to sympathize more of the electronics control of your equipment. This is a not-inverter type of control.

Take note that you demand to take a good electrical noesis to do this as the power supply to the printed circuit board is Alive. It is always a good practice to disconnect and isolate the power supply when you are troubleshooting the control board. If you are not sure, get a qualified technician to cheque your unit.

A split up air conditioner is also unremarkably known equally ductless dissever or mini divide where in that location is an outdoor unit of measurement and an indoor unit. The outdoor unit consists of a compressor, a fan and the condenser. This is the place where heat from the indoor is transferred from the indoor to the outdoor and is rejected to the surrounding.

The indoor unit basically consists of an evaporator, an expansion valve and a fan. Copper pipes are used to connect the flow of refrigerant between the indoor unit and the outdoor unit. The power input tin can come from the indoor unit to the outdoor unit.

The non-inverter divide air conditioner basically consists of a ON/OFF compressor where the compressor is either ON fully or OFF fully. The inverter based compressor can regulate the speed of the compressor depending on the load required.

Here is the breakdown of the typical controller for better understanding.

Chief Command Printed Circuit Board

The principal control lath can exist divided into input power supply, a microcomputer controller integrated circuit, temperature sensor inputs and outputs to control the compressor, indoor fan speed, outdoor fan speed and air swing. The Air conditioning input from the mains has to be converted to DC voltage where it can be used to power the integrated circuits and drivers in the electronics circuit.

air conditioner main control PCB

There are two ways to do this. 1 is by using a step down transformer where the Air-conditioning voltage is stepped down to voltage such as 25V AC or 12V AC. This voltage is then converted to DC past the use of diode span as rectifier and electrolytic capacitor to smoothen the rectified voltage.

A 3-pin voltage regulator is used to become a fixed 5V DC or 12V DC power supply. This low voltages are used to power the microcomputer, DC relays and other integrated circuits in the circuit.

Linear power supply schematic

A simple linear ability supply excursion.

The other method is to employ switched fashion ability supply or SMPS which makes the dimension of the printed circuit board smaller equally the bulky transformer can now exist replaced with a smaller transformer. This blueprint is becoming more than common as the quest for smaller space is condign more than disquisitional.

There is usually a surge absorber or a varistor continued beyond the input of the power supply. This device acts to protect the internal circuit in the effect of lightning or power surge.

When the ability input to the device exceeded its voltage rating, it will clench the voltage by bypassing it to the input source.

This is one device that tin can exist easily damaged if the power surge or lightning occurred beyond its maximum rating.

A fuse is placed in serial with the input ability supply to cutoff any overcurrent or short excursion that happened in the circuit.

This is another protective device used in most electronics circuit. It has to be replaced once information technology is diddled.

Infra-Red Receiver Board

In lodge for the handheld remote control to ship the settings to the controller at the air conditioner unit, there is at least an infra-carmine receiver printed excursion lath that receives the signals from the handset. This receiver is ordinarily located in front end of the indoor unit of measurement and can exist identified by a specially fabricated sticker that let infra-ruddy frequency to pass through.

Handheld Remote Control

Besides known as handset, this is where you tin can command the air conditioner settings remotely by pointing your handset towards the ac unit of measurement. Temperature, timer, operating mode, energy saving function, air swing direction, fan speed, ionizer and sleep fashion are some of the functions that are usually available depending on the manufacturer of the unit.

Separate Airconditioner Control Troubleshooting Guide

Here is a list of separate airconditioner control troubleshooting guide that you can apply if y'all demand to troubleshoot your split up air conditioner unit of measurement. When troubleshooting, make sure mains ability is asunder before proceeding to check the printed circuit board to forbid electric shock.

Problem	Possible Causes	How To Check
1) BURNT	A) Live-NEUTRAL SHORTED B) LIGHTNING C) SURGE OF POWER LINES	A) Bank check TRACK OR COMPONENT BURNT B) FUSE, VARISTOR OR TRANSFORMER BURNT C) FUSE, VARISTOR OR TRANSFORMER BURNT
2) NOT WORKING	A) FUSE Blown B) VARISTOR BURNT C) TRANSFORMER PAD LIFTED D) TRANSFORMER BURNT	A) USE Exam PEN TO CHK AVAILABILITY OF POWER SUPPLY B) USE Examination PEN TO CHK AVAILABILITY OF Power SUPPLY C) USE MULTIMETER TO Bank check RESISTANCE ( 2-3 OHM) D) USE MULTIMETER TO Bank check RESISTANCE ( 2-iii OHM)
3) COMP. CANNOT CUT IN AND OUT	A) THERMISTOR OPEN/SHORT B) CRIMPING OF THERMISTOR NOT GOOD C) PAD AT THERMISTOR LIFTED	A) Utilize MULTIMETER TO CHECK RESISTANCE OF THERMISTOR B) Employ MULTIMETER TO CHECK RESISTANCE OF THERMISTOR (VERY High RESISTANCE > one MEGA OHM) C) Utilise MULTIMETER TO Cheque RESISTANCE OF THERMISTOR (VERY High RESISTANCE > 1 MEGA OHM)
iv) TRIPPED AFTER FEW HOURS ON	OVERCURRENT	REFER TO FUSE RATING OF DISTRIBUTION
5) NOT SENSITIVE	A) Wrong THERMISTOR B) THERMISTOR PLACE AT Wrong LOCATION	A) Employ MULTIMETER TO MEASURE CORRECT THERMISTOR B) Bank check TO ENSURE THERMISTOR AT Render AIR
6) SENSOR WIRE LOOSE	A) CRIMPING NOT DONE PROPERLY	A) Utilize MULTIMETER TO CHECK RESISTANCE OF THERMISTOR (VERY Loftier RESISTANCE > 1 MEGA OHM)
7) PCB NOISY	A) Buzzer SHORTED	A) OFF UNIT AND ON Once again, CHECK Buzzer
eight) FUSE BURNT	A) OVERCURRENT B) LIVE AND NEUTRAL SHORTED C) OVERVOLTAGE	A) Employ Examination PEN TO CHK FOR Ability SUPPLY B) Use Test PEN TO CHK FOR POWER SUPPLY C) USE TEST PEN TO CHK FOR POWER SUPPLY
nine) VARISTOR BURNT	A) OVERVOLTAGE B) LIGHTNING	A) Utilize MULTIMETER TO CHK VARISTOR B) Utilise MULTIMETER TO CHK VARISTOR

Dwelling
Ac Controls
Troubleshooting Split AC

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