marc5180
28-10-2010, 06:37 PM
I've been working on a Mercury Climatic unit today and found the sytem not running.
I looked in the trend controller and found water system fault was on.
Also in the trend controller the max water DP set point was 32 kpa and min set point is 18kpa but Dp plate was reading -0.8kpa which seemed to be causing the fault.
Evap pressure difference at design is 24kpa
I spoke to another engineer who said they had come across this at a few different sites with the same unit and had changed the sensors on one of them but this didn't work.
The previous company who had the contract left a note inside the panel saying " to reset the fault turn mains power off then back on again" but thats not the answer
Design presssure difference is 3.5psi but not quite sure what it means if the readings drop below or above the figure.
can anyone help
I looked in the trend controller and found water system fault was on.
Also in the trend controller the max water DP set point was 32 kpa and min set point is 18kpa but Dp plate was reading -0.8kpa which seemed to be causing the fault.
Evap pressure difference at design is 24kpa
I spoke to another engineer who said they had come across this at a few different sites with the same unit and had changed the sensors on one of them but this didn't work.
The previous company who had the contract left a note inside the panel saying " to reset the fault turn mains power off then back on again" but thats not the answer
Design presssure difference is 3.5psi but not quite sure what it means if the readings drop below or above the figure.
can anyone help