r0ss
12-01-2012, 04:04 PM
Hi guys, just wondered if anyone could give some suggestions to this little problem i have. A colleague installed a brand new wall mounted split with a 15m pipe run right before christmas. After pressure testing/vaccing and additional refrig (100grams). he ran it up but whilst the fan ran, he wasnt getting any temperature difference off the coil.
He was layed off over christmas so fast forward to today and im sent to site to find out what the deal is.
Standing pressure is 150psi
On heating it rises to 275psi and am getting a warm suction line but not as hot as it should be.
On cooling, the blasted thing pumped itself down with the valves open?
So i thought there must be a blockage in the liquid line.
Turned the unit off and the pressure slowly equalised and then i reclaimed the refrig. Blasted nitro through the suction and came back through liquid, first with high pressure and then a lower pressure to see if there was any restriction - it stopped the minute i turned off the flow - no blockage on the 2 brazes/bends. Even blew it with my mouth and got it going through easily.
Vacced the system out again, weighed in some fresh 410a i had in a near empty bottle and got the same issues again.
Its a simple split so there is only so many things it could be.
Im looking at it being a dodgy expansion valve. Anything i could do to try and free it to allow the flow of refrig? or am i better off replacing it with a brand new valve and save anything happening like this in the future.
Bearing in mind its a brand new unit - should Daikin just replace the whole condenser?
He was layed off over christmas so fast forward to today and im sent to site to find out what the deal is.
Standing pressure is 150psi
On heating it rises to 275psi and am getting a warm suction line but not as hot as it should be.
On cooling, the blasted thing pumped itself down with the valves open?
So i thought there must be a blockage in the liquid line.
Turned the unit off and the pressure slowly equalised and then i reclaimed the refrig. Blasted nitro through the suction and came back through liquid, first with high pressure and then a lower pressure to see if there was any restriction - it stopped the minute i turned off the flow - no blockage on the 2 brazes/bends. Even blew it with my mouth and got it going through easily.
Vacced the system out again, weighed in some fresh 410a i had in a near empty bottle and got the same issues again.
Its a simple split so there is only so many things it could be.
Im looking at it being a dodgy expansion valve. Anything i could do to try and free it to allow the flow of refrig? or am i better off replacing it with a brand new valve and save anything happening like this in the future.
Bearing in mind its a brand new unit - should Daikin just replace the whole condenser?