Kirky
27-08-2013, 08:10 PM
Hi all hope everyone is well
Had a call out to a Daikin split serving a server room. Customer said unit is not cooling. On arrival sure enough server room very warm but not as hot as you would think without any cooling. Checked indoor coil cold at inlet but soon losing cooling about a quarter of the way round (cassette). faulty metering device, restriction, partially blocked filter drier, lack of refrigerant. At the outdoor unit the liquid line was sweating away, suction pipe nothing. Put gauges on 10 bar suction 11 bar liquid ?????? We are on R410A by the way. Discharge nice and hot into reversing valve (Heat pump on server room application) and then into condenser coil. Condenser coil not even warm almost feels cool off fans. Maybe not quite as straight forward as I thought. Liquid line not warm to the touch all the way to what I assume is a electronic expansion valve. Pipe sweating leaving the EEV. Decided to switch unit off and restart. On start up the suction pressure dropped to 4 bar before steadily creeping back unto 10 bar which is where I was before. Could it be a restriction in the condenser coil ?. At the minute I definitely think we have a restriction somewhere however the 10 bar suction pressure is puzzling me. Think I'm gonna put some temp cooling in and sleep on it. Any advise welcome and if anyone has a link to the service manual that would be great. Sometimes when your this tired you just tie yourself in knots. Cheers guys
Had a call out to a Daikin split serving a server room. Customer said unit is not cooling. On arrival sure enough server room very warm but not as hot as you would think without any cooling. Checked indoor coil cold at inlet but soon losing cooling about a quarter of the way round (cassette). faulty metering device, restriction, partially blocked filter drier, lack of refrigerant. At the outdoor unit the liquid line was sweating away, suction pipe nothing. Put gauges on 10 bar suction 11 bar liquid ?????? We are on R410A by the way. Discharge nice and hot into reversing valve (Heat pump on server room application) and then into condenser coil. Condenser coil not even warm almost feels cool off fans. Maybe not quite as straight forward as I thought. Liquid line not warm to the touch all the way to what I assume is a electronic expansion valve. Pipe sweating leaving the EEV. Decided to switch unit off and restart. On start up the suction pressure dropped to 4 bar before steadily creeping back unto 10 bar which is where I was before. Could it be a restriction in the condenser coil ?. At the minute I definitely think we have a restriction somewhere however the 10 bar suction pressure is puzzling me. Think I'm gonna put some temp cooling in and sleep on it. Any advise welcome and if anyone has a link to the service manual that would be great. Sometimes when your this tired you just tie yourself in knots. Cheers guys