Excel Technicians Electricians Tool Storage Laptop Carry Case Bag - Grey & Black

 

Buy these from Ebay UK here 

Just got a new tool case , excellent for the price. See how long it lasts and ill update. 

EXCEL TECHNICIANS ELECTRICIANS TOOL STORAGE LAPTOP CARRY CASE BAG - GREY & BLACK

All service engineers and other technicians bag

Padded handle and shoulder strap

Ideal for storing electronic equipment as well as holding larger tools

Polyester material

Excel Technicians Electricians Tool Storage Laptop Carry Case Bag - Grey & Black

Excel EXL2630 Technicians Tool Bag - All service engineers and other technicians on the move need a tool bag which keeps all their equipment close at hand and this technician's tool bag from Tools4Trade offers more space than most. This case features a wide central compartment with deep side panels which are ideal for storing electronic equipment as well as holding larger tools.

Key Features

Safety: Padded central compartment designed to protect your laptop or any other sensitive equipment.

Lining: A bright red outer lining for easy visibility of the stored items.

Design: Zip-out side panels for immediate access to the tools you need. Pockets and holders (including a padded mobile phone holder) for easy access to tools and equipment.

Easy Portability: Padded handle and shoulder strap for maximum comfort.

Ideal for: This case features a wide central compartment with deep side panels which are ideal for storing electronic equipment as well as holding larger tools.

Buy these from Ebay UK here 

Top 3 dangers when using multimeter for 240v mains electrical work

 Safety with electrics is obviously important , a multimeter can aid with safety but there are some dangers and its important to use the multimeter properly, in the correct setting with the correct test leads.

Here are three biggest safety issues when using a multimeter on electrical systems

1) Having meter in wrong function selection , this will give an eroneous measurement in the video below i test a live electricasl outlet in DC instead of AC and its shows a zero reading.

2) I then show another zero reading with the meter leads not correctly seated.

3) leaving the meter in amps , if you then try to , measure voltage, the voltage will appear on one end of the meter leads.

Please watch then video below for a demonstration of this.

Top 5 common issues problems faults refrigeration fridge freezer

In the video below i show the Top 5 common issues problems faults refrigeration fridge freezers i come across in my daily repairs.

These issues are 

Capacitor , these help start the motor in compressor if they are faulty the compressor will not start and usually hums, you nned to test this with multimeter, set multimeter to capacitance and measure if its 10% out of the capacitors stated range repalce it.

Relay and thermal cut out device are all built into one and are a regular problem of faulty fridges.

Compressors can fail both mechanically in which case usually you can hear the problem or electrically in which case you ned to test resistance of motor windings.

Regassing is a major iswsue i find eventually gas will leak from mirco crack in joints and eventually this will affect refrigeration cycle you need manifold gauges to test and regass.

Thermostat , these go often and need replacing if its already been replaced check it fits ok as most often people by cheap replacements and they are the incorrect length the phial then take incorrect readings and is virtually useless.

fridge freezer refrigeration capacitor testing and replacement

Easy test but can be slightly difficult to access wires , you need to remove the plastic wire covers and access the relay , find the capacitor wires and remove one as it might affect reading. use meter probes to contact the 2 caspacitor wires and test wth meter set to capacitance . The reading should be 5% + or - the rated capacitance. This one was a 2.5mF so 2.37mF lowest the reading i got is 2.32mF close to needing repalcement so i will replace it with a new one.

If the capacitor is faulty the compressor will be less efficient , it may start intermittently or not at all in which case all you will here is a hum and the fridge freezer unit will not get cold.

See video of this entire process below 

Testing fridge freezer refrigeration capacitor - YouTube

Fridge freezer refrigeration R600a gas system fault finding troubleshooting

When working on these system safety is the first priority. R600a is a flammable gas and precautions should be used when working on these systems, they do not hold much aprox 80 grams but still be careful when using and storing. Keep the room well ventilated when working on these systems and remember butane will settle to the bottom of a room being heavier that air.

If you suspect a problem with the system you can attach the gauge to take readings of the gases pressure to help with fault finding diagnostics. 

Healthy systems can have a  static pressure reading of between 0.5 - 3 bar , that is with compressor off and pressure equalised from low to high.

With the gauge connected to low side and compressor turned on you would expect to see pressures between -0.1 and -0.6 , negative because your on low ( suction ) side of compressor.

If when you turn on compressor the gauge does not drop into the negative this is a sign your compressor is faulty.

If the system pulls into a complete vacuum it could be a sign of the system having a blockage somewhere if it goes below -0.6 slightly its worth adding a tiny squirt of gas but more than likely the drier unit has become blocked. ( replace drier unit , vacuum system and recharge.) 

If you suspect a leak you can use an electronic sniffer to find R600a leaks quite easily, remember to turn compressor off for testing low side of the system and to turn compressor on for high side testing..

Fridge freezer system recharging - re-gassing - top up R134A R600A Refrigerant gas

Vapour method ( upright bottle ) 

After you have vacuumed down the system and ensured its free of contaminants and moisture and leaks (  by allowing for enough vacuum time ) 

You gauges will still be attached to the low pressure line from vacuum down.

Attach the bottle of gas to the vacuum fill hose of the manifold gauge and ensure the gauges are zeroed 

open the bottle this will fill the hose , undo hose connection and purge the air form the hose so you do not put any air into the system.

You now need to open the tap to allow refrigerant into the low pressure side of the system, allow in a few grams of refrigerant and turn on the compressor. This will allow the compressor to draw in the refrigerant and circulate the vapour. Using your scales now add the exact amount needed to refill the system.

to finish shut of bottle valve and allow compressor to draw in refrigerant left inside the hose, once this is done turn off the valve to disconnect system from the manifold gauges. 

Low side pressure on a healthy system is usually between 0.1 and 0.6 bar.

An excellent video refilling with liquid refilling upside down bottle.

fridge compressor change , Vulkan Lokring demonstration and recharging 

refrigerant.

Fridge freezer refrigerator vacuum testing refrigeration system Leak testing ( Negative Pressure ).

Vacuuming the system down is perhaps the most important step of the repair process.

Firstly the negative pressure you put the system under can be used to check for leaks and you clean out all the air , moisture etc from out of the system and being under negative pressure the moisture in the system will be boiled off as well .

Make sure you ensure all pipe hoses and connection on your tools are tight nothing worse than chasing leaks to find its your equipment.

With the manifold gauge connected to the system via the inline Schrader valve tap on the low side, turn the pump on and open the valve connecting vacuum pump to circuit. you should here the note of pump change and sometime you will see mist come out of the pumps breathing port as moisture it burned off.

You should vacuum down for at least 20 minutes to burn off moisture you should then shut the vacuum pump off and allow the system to hold its negative pressure for another 20 minutes.

The main gauge will be at minus 30 psi but it can be hard to spot leaks on this so it best to use a more powerful gauge, the vacuum pump I own has a very sensitive gauge and it will easy show up even the most minor of leaks so a always not and watch the reading of both.

If it holds for 20 minutes your fine to regas if not you need to find the leak.