Air conditioning - Any recommendations please?? - Part 2

[obichacha]

Update:

service man came today. Gauge show low gas pressure. Tested all joints but no sign of leakage.

150 pressure is standard, for R32 not sure can reached at 150 or not.
My 28VG pressure reached at 140 max.

 

[007Mi6]

Update:

service man came today. Gauge show low gas pressure. Tested all joints but no sign of leakage.

can share who is the installer? Low gas is leakages liao within 1-2 months.

 

[Jun Jun]

just take 85.

But is think the power draw could be due to other factors.

your 0.75kW power draw indicates it is providing 4.0kW +/- 13.6K of cooling. Normally it would need 3.5+3.7+4.5 or 11.7K BTU (50%) to maintain temperature

do you have a computer running in one of the rooms?

No

 

[Chevalier]

Deciding between newway and gain city for my dual compressor setup for my EM. Leaning towards newway. Any thoughts folks?

 

[mark lim]

just take 85.

But is think the power draw could be due to other factors.

your 0.75kW power draw indicates it is providing 4.0kW +/- 13.6K of cooling. Normally it would need 3.5+3.7+4.5 or 11.7K BTU (50%) to maintain temperature

do you have a computer running in one of the rooms?

Yes, just take 85. Don’t understand why the hesitation. They all consume the same power levels once set temp is reached. That the beauty of inverters. The 85 gives that extra cooling. Every house and room is different. So one cannot say 75 is enough unless you do a site survey and have existing systems to compare onsite. $160 to go to 85 is a no brainer

 

[obichacha]

Deciding between newway and gain city for my dual compressor setup for my EM. Leaning towards newway. Any thoughts folks?

Post your floor plan for more efficient setup

 

[ZacharyA]

Update:

service man came today. Gauge show low gas pressure. Tested all joints but no sign of leakage.

No gas leak, but low gas pressure.

The only explanation will be it was low gas pressure all along since installation only took place 1 month ago. Either way sounds sketchy.

Because it can only be one of 2 things, either they didn't set the gas pressure during installation (unlikely) or there is a leak, but they are unable to identify.

Did you see them spraying soapy water at joints or connection to do the checks? How did they check the pipes to confirm that there is no leakages?

 

[ZacharyA]

Yes, just take 85. Don’t understand why the hesitation. They all consume the same power levels once set temp is reached. That the beauty of inverters. The 85 gives that extra cooling. Every house and room is different. So one cannot say 75 is enough unless you do a site survey and have existing systems to compare onsite. $160 to go to 85 is a no brainer

He hesitate between repairing the (lemon) Panasonic vs upgrading / changing to Daikin, and if changing, to go for 75 / 85 when the price is negligible, he wants to know power consumption wise is it a huge step up. Which all have been addressed and calculations laid out to show what you have in a stronger compressor, compensate with lower cooling time vs a slightly less powerful compressor, compensate with a slightly longer cooling time.

Once reaches set temp it is just nominal load ratings.

Then the rest is up to him going in circles liao.

Then he uploaded a floor plan with Master BR similar size as common rooms without accounting for wardrobe. So actually he only needs a 9k but he wants a 12k (going back to the compressor logic, higher FCU cools the room faster as compared to a lower / std FCU @ 9k) then goes back to calculating cents on a dollar on power consumption.

 

[ZacharyA]

Deciding between newway and gain city for my dual compressor setup for my EM. Leaning towards newway. Any thoughts folks?

No idea what are you comparing. Do you mean price? I believe Gain City has the most competitive pricing out there but it seems like they have many installers, both in-house and outsourced. So workmanship is a hit / miss, you can request for in-house / lao jiao experienced installers, but whether they manage to assign one to you or not is another thing.

I have not heard of the other company you mentioned and don't think I saw any recent reviews on them. I think a few folks here used Coolserve and mentioned they have good installers who have been with the company for many years.

I enquired, but realised they don't offer instalment plan. So I will likely fall back on big companies like Gain / MEGA.

 

[Missionwinnow]

No gas leak, but low gas pressure.

The only explanation will be it was low gas pressure all along since installation only took place 1 month ago. Either way sounds sketchy.

Because it can only be one of 2 things, either they didn't set the gas pressure during installation (unlikely) or there is a leak, but they are unable to identify.

Did you see them spraying soapy water at joints or connection to do the checks? How did they check the pipes to confirm that there is no leakages?

They did spray soapy water at the condenser joints and joints at the fan coil.

 

[Chevalier]

No idea what are you comparing. Do you mean price? I believe Gain City has the most competitive pricing out there but it seems like they have many installers, both in-house and outsourced. So workmanship is a hit / miss, you can request for in-house / lao jiao experienced installers, but whether they manage to assign one to you or not is another thing.

I have not heard of the other company you mentioned and don't think I saw any recent reviews on them. I think a few folks here used Coolserve and mentioned they have good installers who have been with the company for many years.

I enquired, but realised they don't offer instalment plan. So I will likely fall back on big companies like Gain / MEGA.

Thanks for the reply man.

Looking more so on workmanship. Both of em have relatively comparable pricing.


Will give coolserve a call tomorrow

 

[Chevalier]

Post your floor plan for more efficient setup

Will do so when I can. ID mentioned a dual compresssor 3+3 setup

 

[obichacha]

Will do so when I can. ID mentioned a dual compresssor 3+3 setup

For 5 room unit right?

 

[johntan93]

Thank you for the detailed clarification on the air conditioning setup. I do have a few follow-up questions to ensure I fully understand and make the best decision:

1. I'm not an expert in air conditioning – for the setup you're suggesting, do I specifically need to request 2 FCUs per condenser - not sure if the default setup usually includes just 1 FCU per condenser
2. Regarding the 4H38VG compressor model you mentioned, should I confirm with Gain City that this is an available option for my needs?
3. You mentioned, "When you run the system 3 other FCU at night and only 1 FCU, the low maintenance power will be higher than a System 2 condenser." Given my scenario, where it's unlikely I'll turn on both the living room and study room aircons at the same time, could you clarify if focusing on either the master bedroom and two other rooms (first compressor) and the study room (second compressor) will result in higher electricity costs compared to a System 2 setup?

I'm leaning towards going with two System 3 setups from Gain City but wondering whether the quotation makes sense.

Update: To make things simpler for anyone looking to compare different aircon setups, here’s a handy table that you can use when comparing details like models, BTUs, pipe material, and copper pipe specs. Had a hard time deciding between Coolserve and Gain City but we're leaning towards Option 4 (Gain City) since the parents are keen on avoiding any wall hacking and Gain City has terrific afterservice.

 

[a4973]

Hi can a kind soul please help me understand what the "Econo" button on Daikin remote control is for? This is a Daikin inverter system 2 installed 8 years ago, thank you.

 

[obichacha]

Daikin's Econo mode is an energy-efficient feature that limits the maximum power consumption of an air conditioner to help reduce electricity bills. In this mode, the air conditioner only runs at 70% of its capacity and ensures it's running at its recommended temperature setting. Econo mode can also prevent excessive cooling, which can happen when people turn their air conditioner on to a very cool temperature right away.
Some Daikin air conditioners also have motion sensors that can detect when a room is empty and automatically switch the air conditioner to Econo mode to reduce energy waste.
This mode also prevents excessive cooling. A lot of people tend to blast their air-con into a cool temperature the minute they turn it on. However, this results in a waste of electricity. Econo Mode prevents this, ensuring that your air-con only runs on its most recommended temperature setting.
https://www.daikin.com.sg/blog-post...sive,its most recommended temperature setting.

 

[a4973]

I recently tried using Econo mode 25c and I feel cooler than 25c normal mode and the SP app shows lower electricity usage for the night hours the AC is on compared to before I started using Econo mode. Is it really possible to have better cooling and reduced electricity usage at the same time just by pressing Econo?

 

[Chevalier]

For 5 room unit right?

Executive maisonette

 

[007Mi6]

Update: To make things simpler for anyone looking to compare different aircon setups, here’s a handy table that you can use when comparing details like models, BTUs, pipe material, and copper pipe specs. Had a hard time deciding between Coolserve and Gain City but we're leaning towards Option 4 (Gain City) since the parents are keen on avoiding any wall hacking and Gain City has terrific afterservice.

I think more important is, whether the CU and FCU can meet the needs first more important....

I saw my neighbours 6 FCU, split them to 4 (4H38VG) plus 2 (3H28VG). End up they pay more but not enough cooling for the living and dining.

 

[Alphas]

I recently tried using Econo mode 25c and I feel cooler than 25c normal mode and the SP app shows lower electricity usage for the night hours the AC is on compared to before I started using Econo mode. Is it really possible to have better cooling and reduced electricity usage at the same time just by pressing Econo?

Limiting the max load to 70% increases the compressor efficiency. When it operate with a higher COP, the energy required to provide the same cooling capacity is reduced.