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  • NH3LVR's Avatar
    04-12-2023, 11:22 PM
    NH3LVR replied to a thread Strange drop in compressor flow in NH3
    What kind of compressors do you have? How much oil are they putting into the system?
    24 replies | 305 view(s)
  • RANGER1's Avatar
    04-12-2023, 10:03 PM
    I would suggest do not pump down to 1 bar, just turn off, close compressor suction if you must. If you have compressor crankcase heater it can be...
    24 replies | 305 view(s)
  • Tycho's Avatar
    04-12-2023, 06:56 PM
    Tycho replied to a thread Strange drop in compressor flow in NH3
    Since it only happens at start up, I would say it's a a plug or restriction in the liquid supply to the evaporator coils. as in oil has collected...
    24 replies | 305 view(s)
  • aakbar's Avatar
    04-12-2023, 06:38 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    Video of water/oil mix from the LPR: https://youtube.com/shorts/-hjzZlq6R2A It is not recent. But it is for the system in question
    24 replies | 305 view(s)
  • aakbar's Avatar
    04-12-2023, 06:34 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    They are connected the way you've shown in your diagram. I've drawn it with bottom connections for connivence.
    24 replies | 305 view(s)
  • aakbar's Avatar
    04-12-2023, 06:30 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    We drain it every winter. I'll see if I can find any videos from last year..but the entire operation is quite difficult so we only do it once a year....
    24 replies | 305 view(s)
  • aakbar's Avatar
    04-12-2023, 06:25 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    We don't have a separate vessel. I've attached picture of oil drain at the bottom of the vessel. I'll ask the operator to drain it of liquid and send...
    24 replies | 305 view(s)
  • Tycho's Avatar
    04-12-2023, 05:45 PM
    Tycho replied to a thread Strange drop in compressor flow in NH3
    Are you draining any oil from the evaporators? Seeing as the evaporators are the lowest point on the LP side, some oil is bound to move from the...
    24 replies | 305 view(s)
  • NH3LVR's Avatar
    04-12-2023, 05:17 PM
    NH3LVR replied to a thread Strange drop in compressor flow in NH3
    That is an LPR. So you do have a separate vessel underneath the LPR (usually called an oil pot) that you drain from? How much water are you getting?...
    24 replies | 305 view(s)
  • aakbar's Avatar
    04-12-2023, 04:23 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    Yeah..we drain it from the low pressure receiver. Its the vessel that receives refrigerant from the High pressure receiver. There's an expansion...
    24 replies | 305 view(s)
  • NH3LVR's Avatar
    04-12-2023, 04:18 PM
    NH3LVR replied to a thread Strange drop in compressor flow in NH3
    Have not been following this closely, but are you draining water from the low pressure receiver? Perhaps we have the terms confused.
    24 replies | 305 view(s)
  • xixxi's Avatar
    04-12-2023, 03:02 PM
    xixxi replied to a thread which one is good. in Fundamentals
    Semi-hermetic Reciprocating Compressors offer easy serviceability but may generate noise and have lower efficiency. Scroll Compressors are known...
    12 replies | 516 view(s)
  • aakbar's Avatar
    04-12-2023, 02:35 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    The anhydrator and OS1 bit aren't operational yet. When i was working on the HMI, I decided to add everything we will eventually have on the screen...
    24 replies | 305 view(s)
  • aakbar's Avatar
    04-12-2023, 02:33 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    We have gauge glass on HPR. Here is what it showed at the time of these fluctuations. We have a danfoss electronic expansion valve. It...
    24 replies | 305 view(s)
  • seanf's Avatar
    04-12-2023, 12:22 PM
    seanf replied to a thread Strange drop in compressor flow in NH3
    Is the anhydrator there because of moisture in the system, or a just in case sort of thing?
    24 replies | 305 view(s)
  • RANGER1's Avatar
    04-12-2023, 10:29 AM
    aakbar, Do you have any level indication on high pressure liquid receiver? Should be about 20% level when everything running normally. ...
    24 replies | 305 view(s)
  • Rabindra's Avatar
    04-12-2023, 08:31 AM
    Rabindra created a blog entry VRF vs Chiller in Rabindra
    Can any body share the experience of part-load performance of VRF system with DX AHU verses Water Chiller with Normal AHU
    0 replies | 22 view(s)
  • aakbar's Avatar
    04-12-2023, 02:11 AM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    Other system numbers right now Ignore Tank 1/2 evaporator pressures and Delta P values. Those PT's are undergoing replacement.
    24 replies | 305 view(s)
  • aakbar's Avatar
    04-12-2023, 02:02 AM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    We switched the start up sequence and turned on compressor 5 mins before the condensers and witnessed the same result. You can view the result in the...
    24 replies | 305 view(s)
  • cricri's Avatar
    02-12-2023, 10:28 AM
    cricri replied to a thread Strange drop in compressor flow in NH3
    Hello aakbar, your starting sequence is unusual for me. you should start compressor first and wait the HP to rise (pressure switch, HP sensor)...
    24 replies | 305 view(s)
  • seanf's Avatar
    01-12-2023, 09:23 PM
    seanf replied to a thread Strange drop in compressor flow in NH3
    It makes me think that initially either theres not enough liquid being supplied to the LP receiver, or that theres something restricting the liquid...
    24 replies | 305 view(s)
  • xixxi's Avatar
    01-12-2023, 09:15 PM
    Hello, I'm in search of a Temperature-Entropy (TS) diagram for Ammonia in imperial units. I tried searching on Google but couldn't find anything. If...
    0 replies | 49 view(s)
  • aakbar's Avatar
    01-12-2023, 08:56 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    We follow this sequence at start up: Condenser pumps/fans come on first. Then brine agitator comes on Then the compressor is started unloaded....
    24 replies | 305 view(s)
  • seanf's Avatar
    01-12-2023, 06:54 PM
    seanf replied to a thread Strange drop in compressor flow in NH3
    Does your chart let you look at data from say, a year ago? Sometimes its handy to look at trends from times when conditions were similar (ambient...
    24 replies | 305 view(s)
  • seanf's Avatar
    01-12-2023, 06:45 PM
    seanf replied to a thread Strange drop in compressor flow in NH3
    Is everything started at the same time (compressor, condensor fan, condenser water pump, brine pump, ice production, ect...) or is there a sequence...
    24 replies | 305 view(s)
  • aakbar's Avatar
    01-12-2023, 05:45 PM
    aakbar replied to a thread Strange drop in compressor flow in NH3
    Hi seanf, we switched from direct expansion to gravity feed around 2018. There is a slight bump in LP liquid level when the compressor flow...
    24 replies | 305 view(s)
  • Grizzly's Avatar
    01-12-2023, 01:44 PM
    Just a thought Freddy. Check your Fan Phase fuses! Grizzly
    4 replies | 101 view(s)
  • Grizzly's Avatar
    01-12-2023, 01:43 PM
    Hi Freddy. just to confirm what you already state. when i check against the alarm codes i have for a different model to yours listed. It say's Motor...
    4 replies | 101 view(s)
  • fredyR717's Avatar
    01-12-2023, 01:18 PM
    The unit starts one then the compressor kicks in and you find that the one that starts is going the correct direction, the it kicks in the other two...
    4 replies | 101 view(s)
  • frank's Avatar
    01-12-2023, 11:38 AM
    Can't help with the compressor problem but with the fans, you will find that the one going backwards is not powered but moving due the the airflow...
    4 replies | 101 view(s)
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