markj
26-06-2009, 10:39 PM
HI,
Visited a site today to investigate a problem with an Marstair HLR540 unit in a resturant kitchen. The unit was moved by another contractor last week who i am told has since vanished off the planet. The condensing unit is MCU +130 ( R22) with HP control. only having a short time to spend investigating today the problem of poor cooling.
The indoor fan coil is icing on the first 5 rows and the frost stat cuts out after a few mins. Upon investigation it appears the previous person has fitted a shiny new liquid dryer and sight glass after the restrictor??:confused:, could this be causing the problem. I did notice a capillary on the indoor as well ( i would guess it's for reverse alought a cooling only from memory some old marstairs use only a capillary on the indoor). Suction drops slowly and sits at 3 bar approx then eventually ice stat trips after a few mins. plenty of airflow over the evap and condensing HP controll running ok HP was at 24 bar which is high for a room that was not hot as kitchen not open.
I am told by the owner they came back once and re charged it ? the black pen on the side says 4kG with the date which i would gues is about right however i would have to recover and re charge to correct weight to confirm 100%. ( pipe run 8mtr max)
So the question is assuming the charge is ok could it be the fact they have fitted a liquid line tryer after the restrictor thats causing the probs? I know it should be befor the restrictor or TEV if required but an not sure of the effect of fitting after?
I am asking the question as i'm pressed for time next few a weeks and need to get in and out quick. obviously i can remove this and check the restrictor re charge etc but it would be nice to know if any one has come across this type of problem b4 and if it makes no difference to leave the glass and dryer in even though it will serve no function.
Any info will be usefull. Thanks in advance.
Visited a site today to investigate a problem with an Marstair HLR540 unit in a resturant kitchen. The unit was moved by another contractor last week who i am told has since vanished off the planet. The condensing unit is MCU +130 ( R22) with HP control. only having a short time to spend investigating today the problem of poor cooling.
The indoor fan coil is icing on the first 5 rows and the frost stat cuts out after a few mins. Upon investigation it appears the previous person has fitted a shiny new liquid dryer and sight glass after the restrictor??:confused:, could this be causing the problem. I did notice a capillary on the indoor as well ( i would guess it's for reverse alought a cooling only from memory some old marstairs use only a capillary on the indoor). Suction drops slowly and sits at 3 bar approx then eventually ice stat trips after a few mins. plenty of airflow over the evap and condensing HP controll running ok HP was at 24 bar which is high for a room that was not hot as kitchen not open.
I am told by the owner they came back once and re charged it ? the black pen on the side says 4kG with the date which i would gues is about right however i would have to recover and re charge to correct weight to confirm 100%. ( pipe run 8mtr max)
So the question is assuming the charge is ok could it be the fact they have fitted a liquid line tryer after the restrictor thats causing the probs? I know it should be befor the restrictor or TEV if required but an not sure of the effect of fitting after?
I am asking the question as i'm pressed for time next few a weeks and need to get in and out quick. obviously i can remove this and check the restrictor re charge etc but it would be nice to know if any one has come across this type of problem b4 and if it makes no difference to leave the glass and dryer in even though it will serve no function.
Any info will be usefull. Thanks in advance.