# A/C gas check

Hello guys can some one please guide how to confirm if the gas in a/c is full or not as it is summers when ever we call some one to do service they will say sir Gas kum hay....what is meter reading to confirm if the gas is less or adequate ...i am talking about home split a/c 1.5 ton

gas pressure is measure by a valve gas meter which u see in those guys hands.

gas pressure should be above 60 on their reading.. it starts low at around 30-40 and slowly rises to 60.. a healthy pressure is 60-65 on load at low thermostat.

if below 60, nearing 45-50, you need gas..

[quote=“alo, post:, topic:”]

Hello guys can some one please guide how to confirm if the gas in a/c is full or not as it is summers when ever we call some one to do service they will say sir Gas kum hay....what is meter reading to confirm if the gas is less or adequate ...i am talking about home split a/c 1.5 ton

[/quote]

Exact check is via guage but some conclusion can be drawn by either:

1) Measuring the current drawn by the AC while compressor is running for at least 5-10 minutes.

2) Checking the return pipe at outdoor unit if it feels cold to hand, which indicates that gas is OK. If the return pipe is not cold, it is a sign of less or no gas.

3) If return pipe is not cold and there is some gas, the inner unit (AKA evaporator) will start frosting (deposition of ice).

@Elite .. Return pipe are the two metal pipes that conect the inner and outer unit?? which has two nuts on them...????

on the outer unit .. 1 pipe is freezing cold while the second one is at normal temperature!!

my A/c has been acting strange lately... it takes about 2-3 hours to cool the room and when i set the temperature to 18degrees C .. after 2 hours when i check the room temperature it doesnt go below 25.. even if it has been kept on all night.. it still stays 25 degrees..

what could be the issue? Less gas or leakage?? i wont some advice before i go n throw a couple of thousand of rupees for something small

Thnx!

There are two copper pipes on the outdoor unit. The small (or thin) pipe is carrying liquified/compressed gas towards the indoor unit where this liquid is converted to gas by a capiliry tube and thus produces cooling effect.

The bigger pipe on the outdoor unit is collecting the gas back into the compressor and this pipe is also called "Return" pipe. If the AC has enough gas, then this return pipe should feel little cold.

@skysocket

[quote=", post:, topic:"]
on the outer unit .. 1 pipe is freezing cold while the second one is at normal temperature!!
[/quote]

Your AC seems to have less gas, if the freezing cold pipe is the smaller pipe.

called a technician.. he serviced the outdoor unit plus he told me the Gas is less .. he added new gas and showed me the pressure of 60 but still its not chilling

temperature is set on 18 degrees.. but after checking 4-5 hours the room temperature is still 25-26

The 'temperature differential' for an A/C performing

at peak efficiency is 15-20F (8-11 degrees C).

That means if it's 37C outside (like today in KHI), then

you should only expect your A/C to maintain 26C

and that too, in ideal conditions.

is sealed tight, your evaporator coils (both inside and

out) are clean, air filters/blower/drain are dust free

and... you are getting proper voltage, something that

is specific to Pakistan.

Putting your thermostat on 18C is going to achieve

nothing, expect hasten the demise of the unit. Your

compressor will have to work continuously towards

an unattainable goal till it conks out. What you will

get, are hefty bills from WAPDA, and all for the same

25C you could have selected in the first place.

Sheikh 'A/C Sirf Chabbees Pur' Chilli

Problem with new AC units is they comes with bottle shape small compressors to reduce power consumption...thus effects cooling performance Window ACs and previous models of LG had giant compressors which works quite well and drop the temperature down to 20c in any condition

No matter what you do but these new split units are useless craps…

Source have seen many units opened

[quote=“sheikh_chilli, post:7, topic:21025”]

Putting your thermostat on 18C is going to achieve

nothing, expect hasten the demise of the unit. Your

compressor will have to work continuously towards

an unattainable goal till it conks out. What you will

get, are hefty bills from WAPDA, and all for the same

25C you could have selected in the first place.

Sheikh 'A/C Sirf Chabbees Pur' Chilli

[/quote]

+1

sheikh_chilli .. lets agree with u for a minute..

but ive never faced such problems in the past 2 yrs.. so how come now??

and yes the outer unit is under a roof (balcony indoor)

[quote=“sheikh_chilli, post:7, topic:21025”]

Sheikh 'A/C Sirf Chabbees Pur' Chilli

[/quote]

* Chobbees pur..

چھبیس لکھا تھا بیچارے شیخ چلی نے.

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^ LOL..

[quote=", post:, topic:"]

What you will

get, are hefty bills from WAPDA, and all for the same

25C you could have selected in the first place.

[/quote]

[quote=", post:, topic:"]

you should only expect your A/C to maintain 26C
[/quote]

quotes from one post.. so what a brotha gotta do than being confused.. Choobbees was the only option left.

Not cooling as before could be because some part of the original gas has leaked and the gas is recharged on (suction)pressure reading only.
Correct procedure calls for weighing in the gas(refrigerant).[Remove all of refrigerant, Vacuum, charge as per weight mention on the outdoor unit]

60 Psi on its own doesn't tell much about the operation of a split.
Gas charging by suction side pressure only is 'hit & trial'. Try to get the pressure increased to 65 and if still no good then try 70. I have seen few splits working near 70.

Do check if the coils of inner and outer unit are clean and free of dust.

@sykosocket:

If you've been running your A/C on 18C for two years,

then i am surprised it hasn't kicked the bucket yet. If

it's performance has decreased, one can surely see

why that'd be. I know a guy who bought his A/C the

same day as I did. He has gone through two splits and

is working on his third, while mine, which logs more hours

than his, is still working flawlessly.

If everything is ideal, then there are two possibilities:

(1) there is a tiny leak in your coils (2) Or they put

inferior quality of gas in your A/C.

The first can easily be verified by a gas valve meter, ie;

if there is a drop in pressure from last time. Right now,

there is an indian gas available in the market (down here

in KHI) that is Rs. 400/kg cheaper than the one from

China. For a 1.5ton split you require at least 2kg of gas.

Good quality gas costs Rs. 1200/kg since a couple of

weeks ago. So for a full recharge, they should charge

more than Rs. 2400/- In our area right now, they are

asking as much as Rs. 3,500/- for 1.5 ton gas charging.

@farhan_ds:

Chabbees works for me at home. At night I have to go

even higher. Sardi lagTi hai. The other temps were part

of a hypothetical example.

Sheikh 'Kambal MeiN' Chilli

I start my ac from 18. Run it for half to one hour on 18. Then shift to 24 or 26.

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[quote=“sheikh_chilli, post:15, topic:21025”]

@farhan_ds:

Chabbees works for me at home. At night I have to go

even higher. Sardi lagTi hai. The other temps were part

of a hypothetical example.

Sheikh 'Kambal MeiN' Chilli

[/quote]

You awesome amazing word wizard

i never slept in ac all my life, just a fan in a closed door room. usually with a Khais..in june-july...so i get the " Sardi lagi hai" part...it happens..

[quote=", post:16, topic:21025"]

I start my ac from 18. Run it for half to one hour on 18. Then shift to 24 or 26. Sent from my HUAWEI G700-U10 using Tapatalk

[/quote]

that doesnot make any difference to the room temperature.. the ac should be able to run nonstop at full voltage with original quality gas for around 5-6 hours in evening time to be barely able to achieve 18C..and that is too much over work for any AC

the ideal heat control which you DESIRE is ONLY a 2 Ton AC in PK heat...not just you, majority would like 18C but can be achieved with 2 ton AC Splits, or a 1.5 ton Window AC..

Now i will start from 24. Will see difference between both scenarios

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@Sheikh Chilli
Hey man..

You seem to have solid technical knowledge about AC splits and all.