Problem:water dripping from a/c unit

[ong]

hi, can anyone tell me y water start dripping out from fan coil unit when there is shortage in gas pressure ??

[chemi-cool]

When there is shortage of refrigerant, evaporating temp is dropping and so is the coil surface.
In many cases, the result will be iced coil.

Comprende?

Chemi:)

[Mark]

Hi.ong

Refrigerant shortage can cause uneven ice to form on the evaparator coil (rather than sweating).
The ice either defrosts partially and often redirects droplets over the driptray out of the airhandler.

Kind regards. Mark

[Temprite]

I was told this by Tech support of a well known brand.

when the unit is slightly short of gas the last few runs of the coil dont sweat properly.

Any runs above this that are sweating properly rely on moisture forming on the runs below runs below. The condensate runs down the face of the coil like a wick effect into the drain.

In the case of slightly short of gas the condensate drops straight onto the indoor unit fan and spits out with the supply air.

I have seen this on a unit that on first glance appears to be charged properly. But upon further investigation it was only slightly short.

Also have seen they same thing when one pipe of a distributor was blocked on indoor unit and was not allowing gas to flow on some of the runs.

Mainly applies to high wall splits.

[frank]

Chemi said it all.
With A/C you want the coil to remain above freezing so that the coil only sweats. If the system is short of charge then the coil can become sub-zero and frost can form causing too much condensate to overflow when the system cycles off.

[phil]

buy a bigger bucket !!!!!!!!!!

Get this all the time with older imi units coils get a bit tired water everywhere find the leak and top it up !!!
Leak in the fridge circuit

also found sometimes that the ac split is not level in the ceiling even if the sytem is lo on gas will drain in to one point and flow over the top

good luck

[frank]

coils get a bit tired
Hi Phil
Never heard of this before - is it a common saying down your way? what does it mean exactly?

also found sometimes that the ac split is not level in the ceiling even if the sytem is lo on gas will drain in to one point and flow over the top
Surely, this problem would show up from day one? Do you mean that they operate correctly for some time and then slope on the wall or in the ceiling causing the condensate to spill?
Do you check your installs to verify that the condensate drains corectly?

[phil]

us yokels in the east midlands hav this funny way of talkin !!!

it means its not quite knackered but soon will be if it left any longer

in most case the coils are beginning to corode away grey falking and crumbling see a lot of this on condenser units by the east anglia coast where the salt air attacks the aluminuim

copper pipework also suffers by pitting or liitle holes developling again caused by corrosion this can lead to refrigerant slowly leaking away. had the same some times on williams cabinets using r134a ie the catering benches fridge with the fans in the top

phil

[frank]

Hi Phil

I now understand :)
By the way, Nottingham is in the East Midlands :D

[phil]

northampton should adopt a new song we are in the middle of nowhere no manufacturing as such now only logistics conpanies

i very rarely work in northants now mostly east anglia and lovely london not the city thank god !!!!!!!!!!!!