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mknight
17-07-2008, 08:26 PM
Hi have been working on a IMI celler cooler today customer had said it was not cooling. On arrival found room temp. to be 10-12c think this is about right but found coil tempture on evaporator at bottom to be 0c and the top at 12c ??? System is a 407c and took suction pressures at 55psig. Condensor fan seems to be running at full speed todays outdoor temp 20c. Is the system short of gas or is there a problem with the expansion device may be partial blockgage any ideas? thanx
frank
17-07-2008, 08:44 PM
Hi have been working on a IMI celler cooler today customer had said it was not cooling. On arrival found room temp. to be 10-12c think this is about right but found coil tempture on evaporator at bottom to be 0c and the top at 12c ??? System is a 407c and took suction pressures at 55psig. Condensor fan seems to be running at full speed todays outdoor temp 20c. Is the system short of gas or is there a problem with the expansion device may be partial blockgage any ideas? thanx
Dear mknight

No offence, but what are you doing working on a cellar cooler if you don't know the basics??

Taking superheat readings,among other things, will tell you if it's short of gas.

Are you a trainee just out on your own?
mknight
17-07-2008, 09:08 PM
sorry Frank not been to school for 10 years+ been split bashing ever since forgoten more then i can remeber!
alan 07
19-07-2008, 10:05 PM
alot of the IMI units have the exp device just after the liquid service valve at the outdoor unit they have a little orifice inside. Pump the unit down and take it apart, its on flare nuts sometimes they get crap inside them.
dunny123
23-07-2008, 10:06 PM
You say the temp in the cellar is 10-12c?That the perfect tempreture.
What makes you think its short of gas?have you checked the sightglass,is the evap icing up?
marc5180
30-07-2008, 05:32 PM
As Frank says, you need to take the temperature of the suction line and work out the superheat. This will tell you if the unit is short of refrigerant or if there is a blockage.
Peter_1
30-07-2008, 06:28 PM
As Frank says, you need to take the temperature of the suction line and work out the superheat. This will tell you if the unit is short of refrigerant or if there is a blockage.

If he said that he measured temperature at the coil at the bottom and the top, then he did somehow a SH measurement.
One part will be at evaporating temperature, the other part will be superheated +/-10K. With the glide of R407c, his measurements are +/- normal.