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Guys! You all got DIY clean your aircon blower ?

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Old 28-03-2019, 09:04 AM   #2746
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Old 28-03-2019, 01:00 PM   #2747
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Our condos, HDBs might have a system 3 + system 2 max esp for those with 2 electrical isolators at the AC ledge (2 x 32A MCB at the ELCB). But landed, shophouse or even some big condos/penthouses might have bigger/commercial based systems (VRV/VRF/VRX etc), now that i think of it, i have seen them being used in residential dwellings before.


Below shows a medium sized Daikin VRV system being cleaned anyhow with an entry level pressure washer. Cleaned this way and at such a distance with a 15-20 deg fan spray (very low power density at the target surface), i think might as well don't clean. The coils are "delicate", but not this delicate.
The better equipped pros use more powerful pressure washers, 2000+ PSU and higher flowrate. Else how to finish efficiently and move on fast to the next job?


Actually don't say that, give you 3pcs x system 2 units indoor evap and outdoor condenser, an entry level pressure washer like our Karcher K2.050 with variojet 360 just ok and decently powered to handle nia.







Bonus vid
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Old 28-03-2019, 06:13 PM   #2748
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Old 28-03-2019, 06:14 PM   #2749
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High velocity exit of water from the condenser coil from pressure washer spray. View in full screen, you will be able to see the details clearly.


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Old 28-03-2019, 06:24 PM   #2750
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Old 28-03-2019, 06:32 PM   #2751
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BTW, like i have mentioned several times before, as far as possible try to get the nozzle spray to hit the fins perpendicularly at 90 deg. Do not slant it as shown below.
If you slant it that way instead of hitting it at 90 deg perpendcularly straight in, you'd hit the horizontal refrigerant pipes running across the condenser coil and the exit velocity is very much reduced. So the portion of coils deep inside the unit would not be really cleaned.

Of course if are willing and able to open the top access cover and clean spray from the inside too, then that'd be best. Use a cloth to drape over on the other side of the coil if you are on an AC ledge and water would spray onto the walls, and that might leak to downstairs neigbours' windows and stuff. (my AC ledge is like that, got extra drainage holes somemore, sure kena from downstairs neighbours with the spray).

The same goes for the indoor evaporator coil. Need to aim 90 deg perpendicularly.



That is why the Karcher variojet VP 145, VP 180 S 360 degrees nozzle is so important. With pressure adjustment, you can turn down the pressure as well if you are not comfy with using a 15 deg full pressure spray to whack. With a 90 degrees perpendcular spray into the coil, there is ample penetration even with dialed down pressure (of coz don't dial it down past 50% lah)



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Old 28-03-2019, 06:43 PM   #2752
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Old 28-03-2019, 06:51 PM   #2753
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This is the correct orientation of handling the spray for the indoor evaporator coil.
The fan spray should be vertical. This cuts down a fair bit on the back spray and makes things more controllable.

If you orientate the fan spray to be horizontal, what happens is that when the fan spray hits the horizontal refrigerant pipes, it'd spray up, down and towards you with lots of uncontrolled backspray.


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Old 28-03-2019, 06:53 PM   #2754
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Daikin Smile II series disassembly

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Old 28-03-2019, 09:17 PM   #2755
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Seems to be half the pressure of the entry level pressure washers. (not as much ultra fine mist leaving the coil etc)

The thais don't seem to like to use evaporative coil cleaners also.
But i can tell you, a coil cleaner really makes a difference when working together with medium to high pressure water.






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Old 28-03-2019, 10:04 PM   #2756
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Old 28-03-2019, 10:30 PM   #2757
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Old 28-03-2019, 10:34 PM   #2758
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Yucks!!!! Looks like 3 types od mold in there. No allergic rhinitis no sinusitis no asthma no tok.

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Old 28-03-2019, 11:35 PM   #2759
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Old 29-03-2019, 09:28 AM   #2760
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Hi, could you kindly list out the hardware and chemicals required for aircon cleaning? Please also list the safe chemicals that you mentioned as now after viewing your posts I truly believe the harsh chemicals was probably what caused the corrosion which led to the replacement of my previous systems. The aircon company actually said that aircons usually do not last more than 7-8 years here due to the wet climate.

Actually we already have an annual cleaning contract already but I believe it is useless after browsing your videos, though to be fair to them it isn't very expensive for the 6 units that they have to clean.

But more importantly I am greatly shocked at the amount of mold that could be lurking in the indoor unit. My wife, being a hygiene freak and an allergy sufferer, is even more shocked when she saw the videos.

Thank you in advance, your posts really put everything into perspective!

Bro, regarding the details you can just read through the past 15 pages. The procedures of how to clean it is also in the videos and posts.
With the below tools, you do not really need to dismantle the main cover or blower, though it'd be nice if you can take out the front condensate tray and give it a good cleaning, some rubbing alcohol or denatured alcohol diluted 1:1 would be nice to aid in physical removal with rubbing (i actually use denatured alcohol 96% no issue with the plastics).
While the condensate tray is being cleaned and with the main cover on, just use some cling wrap+plastic bag and tape up the electrical box at the RHS and any other sensors like IR sensor....then put on the main cover. This helps waterproofing in future washings. When the main over is not removed, that itself is already partially water-proofing the electricals.



Equipment to get in summary :

You need a pressure pump, either the 12V type which you can adapt and connect with a 90 deg wand, or a pressure washer type which Karcher brand has a 90 deg attachment, which also conveniently has pressure adjustment so you can dial down the pressure if you are not comfortable in handling such power as it's a pretty powerful tool.

The 12V pressure pump and 90 deg wands need to be purchased via Taobao and so if you have issues then go for the Karcher pressure washer.

Since you said "6 units", i believe it is better for you to go down the Karcher K2.050 route with variojet 360.
Washing your condenser coils (2 times system 3, or VRF/VRV?) would be much more efficient, it'd probably take too much time with the regular 12V pumps.

Just look at his one using a small pressure pump but several times less power than a pressure washer, this is a 6HP unit, similar to yours.




Go to qoo10 and search for them, the K2.050 is easy to find. The variojet 360 attachment is available from this seller called Hardware Specialists.

The safe cleaning chemical is also available from Hardware Specialist. Search for Supersteam Crystal 701 which is low foam but is a bit less powerful than Supersteam Duo Green 205, which is more powerful but supposedly has medium foam. If you do not want to get these stuff, using AJAX/Magiclean multipurpose/floor cleaners can also do the job especially if just using them undiluted, only issue is that they are very fragrant and i reckon some do not like the smell.

Get the aircon wash bag from qoo10, less hassle than getting from Taobao if you are not a frequent buyer.

Good luck.
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