Inverter Type AC in Pakistan (Inverter/Non Inverter Dedicated Discussion)

[AkbarGr8]

The cooling coil frequently leaks - rusting / humidity issues. Going forward, I'm opting for non inverter AC's where there is overall less usage.

[ch.talal]

R410a is the blend of R32 and R125. To achieve same level of cooling R32 requires bigger condenser than R410. So I don't know where you found the figures that R 32 alone is better in performance than the blend of two gases (R410A)

[nfssaad]

Property comparison between R410A and R32
Table 1 shows basic properties' comparison of R410A and R32. R410A is a refrigerant mixture of R32 and R125 with 50/50 wt.%, and R32 is a pure fluid. The molecular weight of R32 is 28% lower than that of R410A. Critical pressure and temperature of R32 are 850 kPa and 6.0 K respectively higher than those of R410A. Both R410A and R32 have very similar boiling point. As discussed before, the main environmental benefit of R32 over R410A is due to the fact that R32 has a much lower GWP of 675,

https://www.sciencedirect.com/science/article/abs/pii/S0140700712003532#:~:text=R410A%20is%20a%20refrigerant%20mixture,higher%20than%20those%20of%20R410A.

[dms664]

R32 is highly flammable

[Thinking]

mildly flamable. not highly.

[Thinking]

Further to that in US R32 is the new allowed refrigent and R410a is getting phased out like R22.

[anc]

yes I have heard this from installers as well, incidents have happened and some installers even refuse to install AC if its R32

[mrdeejay]

A while ago I was looking into reports of AC explosions. My conclusion from reading technical data and talking with local AC installers was its mainly due to poor training and jugaar baazi of installers in our region.

For example, if you don't properly purge out refrigerant lines using Nitrogen gas OR vacuum them - both of which get rid of flammable oxygen gas from open refrigerant lines, then its a recipe for disaster because than a flammable gas like R32 will mix with oxygen present in the lines - significantly increasing chances of explosion from a nearby source of ignition (e.g. faulty compressor, cigarette etc).

Each time a repair needs to done. Follow these simple rules and insist even if ustaad says "sir hum rooz aisay AC pe kaam kertay, aap tension na lain"

1. For leak testing, Always use Nitrogen gas. Some ustaad fill up refrigerant lines with Oxygen (air) which is a huge mistake!
2. When filling gas or releasing gas from existing Condensor. Always vacuum for 20 mins using a proper vacuum pump (not refrigerator compressor that ustaads lug around with them)
3. Never Top up gas in an Inverter AC. There is a lot of science behind it, but basically, remove all existing gas, vacuum and then re-fill by Weight - never by PSI !!!

[mgalaxy3]

How can you weigh gas that’s already in the cylinder ?

[krafiq]

By placing the cylinder on a weighing scale and subtracting the weight of empty cylinder written on it?

[mrdeejay]

Plenty of videos on youtube:

[StoneCold316]

Gree build quality is pathetic .. pipes are so thin

go for Haier

[highroller]

Try explaining that to everyday pathetic AC technicians. Only a handful got vacuum pumps

[mrdeejay]

Anyone know whats the current rate for used non-inverter 1.5ton ACs? I have two 10 year old ones that work fine wondering how much to sell them for

[krafiq]

I sold mine last yr around 13-14k.
Prices keep on changing. Call up a few AC dealers who buy used AC, SMS marketing ppl send such messages all the time and ask for a quote

[mrdeejay]

Few months ago, I sold an AC for 15K but considering dollar devaluation and sky rocketing prices of new ACs I think it should be around 25-30K.

[nfssaad]

if they work fine, relocate them to a rarely used room.

I have done this.

selling is just pure loss.

[mrdeejay]

Only had one rarely used room, already installed one there, so have two left now

[krafiq]

Getting F0 (F zero) error in gree CITH model. Anyone faced it or know how to solve it?

[ch.talal]

Blast may happen when you have faulty gauge and you overfill high pressure gases like R410a and R32. The incidents that have happened in past could be due to faulty gauges used by technicians and over filling the system.

3. There is nothing wrong in topping up system with refrigerant if done properly. Over the span of years gas pressure may reduce a bit due to very minor leaks at joints that couldn't be detected while installing AC. So topping up gas is recommended to bring system to recommended pressures.