So they are back on my Radar next year. At the moment the two braands are Daikin and Panasonic.

I never could figure out why, but in the early days Daikin insisted that power only comes in through the outside unit.

I have a hybrid Videocon (Outside) and Voltas (Inside) since 2001. This happened in 2006 or so since the early Videocon control units were prone to irreparable failure, as I found out to my cost and inconvenience.

When you remove the filter the metal fins you see are the first row of fins which are usually cleaned and kept clean by the AC tech guys. Next time ask them to clean the far side or second row of the cooling fins( evaporator coils). The second row of fins is clogged with muck in your AC. Cleaning the second row is a tedious job and most AC technicians forgo cleaning this. This has to to be done religiously once every year in addition to cleaning the front row every 3 months. Filter is to be cleaned on a need to need basis and if you do not allow fresh air into the room, cleaning once a month will suffice. I have to clean the filter every fortnight because we operate the AC with all the 5 windows kept open and dust invariably gets in. We have this luxury since none in our family is yet afflicted with dust allergy or asthma.

What you said is right.The technician cleans only the front row AFAIK.Will call them for service and get the job done thoroughly.

^ it also depends on the ventilation of your room. If you keep the temperature too low and close the room; bacterial activity will be far greater. Also dusty environment will act as catalyst as the filters will get clogged easily. Try to clean them more often(plastic ones have longer life) also ventilate the room often. On extreme side have a air purifier system. Cheers!

We have a 1050 SFT Office space to be Air conditioned, its 24FT by 40 FT Long hall and a 100 SFT small landing area near the stairs. We cannot install plant ACs and we are looking at split units, the 100SFT space will act as a server room and there will be a 100 SFT cabin for conference, rest will be one operations floor. Please suggest

Thanks,

Pramod

Hello Pramod Sir,

Since your message lacks in the information about the area which is exposed to sun, so the actual requirement may be slightly different.It would be better if you can give the layout w.r.t the directions and the number of employees who will be present in the office during the working hours along with the sun exposed area.

Regards,
Lalit Tyagi

^ A rough calculator and a expanded version is available at the Daikin site. Link if the link does not work, then do navigate their menu and a section is dedicated to finding the best tonnage for your purpose.

Assuming that you have about 20 to 30 persons in the room and one side is sun facing but with decent heat reflectors, I suggest getting two units of Daikin. The numbers are FVY71 and FVY100. Use both units for cooling in the initial stages and then switch off the bigger unit for maintaining the temperature. If the room is not well insulated then you can switch of the smaller unit. In peak summers both can remain on and in winters you can use their heater function. Make sure not to buy units with the same cooling capacity if you intend to save money in the long term.
Use the minimum required tonnage ac among the two that will not cut off often. Continuous running is preferred over repeated off and on. Both units should preferably be placed in diagonally opposite corners or opposite sides of the same corner. For wiring from the electricity meter to the Ac units use the thickest wiring you can afford. You will save a lot of money if voltage does not drop more than 3 volts from the meter to the AC.
Daikin FVY71 Price, Features, Deals, Offers, Reviews, Images, Videos
If Daikin is too expensive for you then head to the Panasonic store.
If you have deep pockets then head over to the O General units. Keep the tonnage in the same ballpark.

Forgot to mention to install Orient Hurricane model( not any other model of the company) fans for each cubicle.The size of the fan should be 1050 mm and brown colour. Max you should go is to 1200mm and not any higher. Ceiling fans are a must in A/C room contrary to common thought especially when having very powerful Ac units.

Coming to compressor global leader which has highest market share in refigeration , airconditioning is Danfoss . The company is active in India .They have many first to there name including the first commercially produced Varibale Frequency Drive / Inverter , A huge range of extremely efficient compressor , RTD'd etc .Infact i think Bluestar , Carrier buy from danofss for many of their applications .But i believe Danfoss is not focused on low tonnage as of now in India.
We have a old white westinghouse which is over 14 years old and till date apart from filter cleaning / 3 times complete cleaning has not required any job .

Rough estimate
- 1000 sqf = 10 tons
- 32 persons = 8 tons
- 6KW of computer = 2 tons

These are for 40 degrees ambient and 22 degrees room temparature. If the room is cool you can reduce 2-4 tons, but you will still require 15 tons minimum. Any thing less you will be sweating in peak summer.

What is more important than cooling is that there has to be ventilation/air scrubbing else the room will soon become stuffy. That is why for large office areas, central AC is preferred. The air is recirculated and cooled by chillers, there by ensuring that there is no stale air.

Please get in touch with Blue Star or Daikin professional services group. They will calculate the requirement and guide you properly.

here's some pictures that you requested..

Regards,

Rana.

P.S : Thanks a lot for all your help

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If two units do not suffice then buy two more units of the same two capacities. That means in total 2 units FY71 and 2 units FY100. Placing them in opposite corners of the room should be fine with the same tonnage in diagonally opposite ends of the room. Without the fans you will need all fours units. But for start up companies electricity bills have to be curtailed to a great extent. Electricity economics matter in the early stages of any company.

I have a 1.5ton Godrej split AC with Syscon stabilizer

Stabilizer Model = XL'ent
4kVA
input volts = 190 - 270 V
output volts = 200 - 240 v

working range 160 - 270 , 50Hertz

with the above setup am still getting low voltages during the night times, am not able to sleep. This stabilizer was given by the dealer when i got the AC...

Is this normal stabilizer .... i really do not know.

should i go for Double boost stabilizer or Triple boost ?

how much will it cost in chennai

Thank you rana_kirti, that is a neat machine inside and out.

What you have is a normal stabilizer meant for steady power supply. Costs around Rs.1200 - Rs.1500 max. It is useless for Chennai's EPIC low voltage problem.

Go for a Triple Boost from V-Guard. A bit costly, but works like a charm and has a internal fan to cool the unit off.

Ignore all the local makes like Shakthi, Prime, Guardian etc as they are worst of the lot (uses aluminium inside, and goes kaput soon). I have a twin boost PRIME make, which starts smelling like burning after 2am early morning. Fills the room with the pungent smell and we shut it off everyday around 2am. Am looking for Triple booster now.