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Air conditioning - Any recommendations please??

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Old 04-12-2016, 03:21 PM   #8836
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MBR is msxy ga10va
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Old 04-12-2016, 03:29 PM   #8837
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So sorry to hear this, I was also being introduced to LG recently when I visited Gain City. But I had not made any purchase as my BTO was not ready at the time.

While trying to do some homework on air con, I was lucky to bump into an air con repair specialist who was working in my workplace the other day.

And I was warned to stay clear of certain brands and he himself was using Mitsubishi Starmex.

And please take note that Mitsubushi air con for residential home comes in "two brands". Mistubishi Electric (Starmex) & Mitsubushi Heavy Industry. So please take note when you are purchasing "Mitsubishi" air con.

Hope this helps for those who are looking at Mitsubishi air con currently.

Visited Gain City to buy Mitsubishi for my resale HDB 5 room house but was talked into buying LG System 3 insteadfrom Gain City.

Since we moved Into our fully renovated house beginning this year, we have so much headaches

1. Compressor dented and collected rain water - small matter and settled quickly.

2. Hot air blewing shortly after 2 months or so. Called Gain City and LG man came. Said gas leak and not product problem.

3. Gain City's sub contractor came, said need to do minor hacking to attach devices to detect where the gas leakage was. But I monitor first after he him tightened a knot in the compressor. Fortunately it worked.

4. First service done by Gain City also disappointing. The senior technician still ok but the junior simply talked too much, messy and untidy. But worst, was told one unit cannot be serviced as the trunking blocked the aircon and cover couldn't be removed. Need to relocate the unit.

5. Gain City's sub contractors came the next week. Either to relocate and move the unit upward or opened up the trunking every time servicing is done. I took the 2nd option to avoid all the messes and inconvenience.

6. The same unit started to make funny noise whenever I switched it on. On nights when I sleep light, I feel irritated by the noises.

7. Worst of all, rain water started to sip into master room lately!!! Given my feedback in Gain City 3 days ago, asking for a complete solution but no response from them yet!!!

I am considering to seek help from another aircon company and also give up my 2 year service contract with Gain City. Any recommendations?

If Gain City cannot resolve my problems once and for all, I hope another company can.
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Old 04-12-2016, 03:55 PM   #8838
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MBR is msxy ga10va
Hi, if I am not wrong, the MSXY-GA10VA is paired with the MXY-4A28VA or 38VA if you have only one condenser outside. This condenser is 2 ticks and is still selling in the market.

Though this model is out for many years, it is relatively new (meaning people are still buying it as new model for this home).

Depending on the detail of the problem, you may have a FCU (the one in the MBR) issue or the piping issue rather than the whole system. Is your MBR FCU very near to your outside condenser? What is the estimated piping length between both of them? Around 2 - 3 meters?

It may not be worth changing the whole system.

Last edited by dachee; 04-12-2016 at 04:00 PM..
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Old 04-12-2016, 04:00 PM   #8839
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Hi, if I am not wrong, the MSXY-GA10VA is paired with the MXY-4A28VA or 38VA if you have only one condenser outside. This condenser is 2 ticks and is still selling in the market.

Though this model is out for many years, it is relatively new (meaning people are still buying it as new model for this home).

Depending on the detail of the problem, you may have a FCU (the one in the MBR) issue rather than the whole system. Is your MBR FCU very near to your outside condenser? What is the estimated piping length between both of them? Around 2 - 3 meters?

It may not be worth changing the whole system.
Yes .. Only one condenser.

I think should be short because just by the left is the Aircon ledge liao. But 2 ticks means I pay alot in electric right ?
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Old 04-12-2016, 05:42 PM   #8840
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Yes .. Only one condenser.

I think should be short because just by the left is the Aircon ledge liao. But 2 ticks means I pay alot in electric right ?
Yes and no.

Though the FJ series with MXY-4G28VA has 5 ticks, its max capacity for a 10+10+10+10 configuration is only 6.5kW (22k Btu), while your existing MXY-4A28VA (with limiting current) has max capacity of 7.2kW (24.5k Btu).

It therefore depends on the temperature setting that you which to achieve for each room. From the spec, full capacity of each FCU cannot be achieved with either 4G or 4A condenser, even if you up-size to 38VA for the condenser.

By the way, the 5 ticks COP full load of 4.89 is just 0.03 above the NEA's rating of 4.86. So it is very close to only 4 ticks (high side).

You may wish to do an running cost vs initial cost to see what saving you are getting. It may be good to know that other users of the 5 ticks model is paying for their usage pattern.

The above are my opinion and hope that they are useful.
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Old 04-12-2016, 09:41 PM   #8841
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Hey guys

Considering system 3 starmex 5 ticks, from coolserve:
3x MSXY-FJ10VE
1x MXY-3G28VA

I was talking to a gain city salesperson, and he recommended me the 2 tick model, saying that the 5 tick compressor is underpowered at 20k btu (should be minimum 27k)

I was also looking at the brochure here. It says that the power is 6 (2.9-8.9) KW, which is technically 20,400 (9860-30,260) BTU.

That's kinda confusing. I guess the gain city guy was using the 6kw rating to make the recommendation, while the coolserv website is using the max number in the bracket to say that the compressor has a 30k btw capacity.

How are power ratings published for other brands/models? Why are there different numbers and which one should we use?

Personally, I'm looking at 5 tick because we use the aircon a lot. 1 unit will be on almost 24 hours, the other about 12 hours, and the 3rd on about 8 hours.

Obviously, the 5 tick rating will be pointless if I get 3x 9k btu blower but the capacity of the compressor is only ard 20k.

I've also been told that there's a noise issue. experiences anyone? If this compressor is truly underpowered, is the noise the result of it overworking?

I'm open to recommendations, except daikin because in my experience they're noisy and shitty lol.

Also I'm assuming it would be good to upgrade the pipe and insulation. Recommendations for merchants also welcome. Was checking out coolserv since they seem to be highly recommended by the folks at renotalk. All best seemed to have screwed up the piping for our current toshiba set.

Last edited by shadowoflight; 05-12-2016 at 04:03 AM..
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Old 04-12-2016, 11:31 PM   #8842
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Yes and no.

Though the FJ series with MXY-4G28VA has 5 ticks, its max capacity for a 10+10+10+10 configuration is only 6.5kW (22k Btu), while your existing MXY-4A28VA (with limiting current) has max capacity of 7.2kW (24.5k Btu).

It therefore depends on the temperature setting that you which to achieve for each room. From the spec, full capacity of each FCU cannot be achieved with either 4G or 4A condenser, even if you up-size to 38VA for the condenser.

By the way, the 5 ticks COP full load of 4.89 is just 0.03 above the NEA's rating of 4.86. So it is very close to only 4 ticks (high side).

You may wish to do an running cost vs initial cost to see what saving you are getting. It may be good to know that other users of the 5 ticks model is paying for their usage pattern.

The above are my opinion and hope that they are useful.
Thank you.

Sorry I still confused. So I should buy a new set or just change my MBR unit?
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Old 05-12-2016, 07:54 AM   #8843
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Thank you.

Sorry I still confused. So I should buy a new set or just change my MBR unit?
Hi, Sorry that you are confused. It is good to understand so that you can make a rational decision.

What is it that you are confused about? Good to clarify your doubt.

Last edited by dachee; 05-12-2016 at 08:30 AM..
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Old 05-12-2016, 08:12 AM   #8844
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Moving into a resale flat soon, need some advice.
Current config is system 3 inverter ac, one each in Living room, MBR and BR 1

Hubby is more inclined to change to 1 compressor for living room, another compressor for MBR and BR1 ( dun need BR2)

Any major diff as compared to system 3 instead?
Will elec consumption be MUCH higher than sys 3?
we use ac a lot esp for living room.

Also looking at starmex series, pls recommend suitable config. its a small flat of 85 sqm only.

Thks!
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Old 05-12-2016, 09:42 AM   #8845
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Moving into a resale flat soon, need some advice.
Current config is system 3 inverter ac, one each in Living room, MBR and BR 1

Hubby is more inclined to change to 1 compressor for living room, another compressor for MBR and BR1 ( dun need BR2)

Any major diff as compared to system 3 instead?
Will elec consumption be MUCH higher than sys 3?
we use ac a lot esp for living room.

Also looking at starmex series, pls recommend suitable config. its a small flat of 85 sqm only.

Thks!
Hi, Let's look at system 3 FJ series with the MXY-3G28VA condernser as it has 5 ticks (just over the 4 ticks rating by 0.03) for energy saving. This system 3 has capacity of 6 kW with full load COP of 4.88 and the air flow of the FJ10 at high is 16.9 m3/min and sound level of 19.47 dB.

The FJ10, if not wrong has a 2.5 kW capacity. Meaning with 3 FJ10, you can use up to 7.5 kW but the 3G28VA only provides 6 kW. In bracket it is written that the 3G28VA has 6(2.9-8.9), if I am not wrong, it means that the max capacity which it can reach is 8.9. However, this value is likely to happen only for a short while and therefore cannot be considered in normal operation. Thus the normal rating is given as 6 kW.

With the system 2 FJ series using MXY-2G20VA condenser with 5 ticks, the normal rating is 4.8 kW with full load COP of 4.87. You can still use the same indoor FCU as system 3.

With 2 FJ10 having a total of 2.5 X 2 = 5 kW, it can be supported by the 4.8 kW rating of the 2GVA. So you still get the good energy saving of 5 ticks with just 4.88-4.87 = 0.01 less COP between the 3G28VA and the 2G20VA.

If your living room is small, accepting up to 9k Btu or 2.5 kW, than you can use the MUY-GE10VA condenser and MSY-GE10VA FCU with a normal capacity rating of 2.5 kW and, full load COP of 4.56, FCU air flow and sound of 11.4 m3/min (lesser than the FJ10) and 19-40 dB respectively.

Note that having 2 condensers would mean that you would need 2 isolators (ie power point), one for each condenser. An addition one is therefore needed.

In the event that you need a higher capacity for your living room, then, you can up size to the 2G and use FJ13 or the FJ18 which has 3.5 kW and 4.8 kW respectively. Pls confirm with Mitsubishi support team on this configuration.

The above are my opinion and hope they are helpful.
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Last edited by dachee; 05-12-2016 at 10:25 AM..
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Old 05-12-2016, 10:24 AM   #8846
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To JAPDestiny,

You have to check if your resale flat allows installation of 2 compressor units first.
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Old 05-12-2016, 11:03 AM   #8847
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To JAPDestiny,

You have to check if your resale flat allows installation of 2 compressor units first.
yes it does
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Old 05-12-2016, 11:18 AM   #8848
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need some input from all the aircon guru. my contractor recommended me his air con installer. below are the quotes for 4 room bto.

Mks80qvmg/ ctks25qvm 3 / ctks50qvm 1
Daikin $4500

Mxy-4g28va/ msxy-fj10ve 3 / msxy-fj18ve 1
Mitsubishi electric
$4580

*Upgraded ac materials using
-16mm upvc drainage pipe
-22swq copper cool LCHT
-100% pure copper flexible cable - both 3c70 & 3c40 keystone
-1/2" thickness armaflex insulation
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Old 05-12-2016, 01:27 PM   #8849
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Hi dachee bro, saw your input about additional isolater for second compressor.
Just to check if the second system is a System 1 unit, can we request the electrician to change the plug to a higher AMP instead of isolator?
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Old 05-12-2016, 04:30 PM   #8850
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Hi dachee bro, saw your input about additional isolater for second compressor.
Just to check if the second system is a System 1 unit, can we request the electrician to change the plug to a higher AMP instead of isolator?
Hi, I don't think you can do that. The breaker at the DB, if not wrong is 20A. Some condensers need max fuse size of 15A with Min. circuit ampacity (MCA) of 12A which affect the wire size while others need max fuse size of 20A and MCA of 17A.

So if you have two condensers using the same set of wires, breaker then, it is likely that you may have your wires burnt due to overloading. Changing the plug to a higher AMP does not improve the wires and breaker capacity.

The above are my opinion and hope they are useful.
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