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  1. It is very similar to the A2 models just using a...

    It is very similar to the A2 models just using a different way to calculate the SCT.

    Most likely scenario is that your SCTB sensor is reading off.
  2. There are clamp on thermistors on each condenser...

    There are clamp on thermistors on each condenser coil circuit . This temperature is converted from saturated condensing temperature to discharge pressure. All of these units have common condenser...
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    When you say a new evaporator coil what is the...

    When you say a new evaporator coil what is the design of the coil ? I am sure the boys from TEC helped with this.
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    Well since the Clink does not communicate to the...

    Well since the Clink does not communicate to the VFD on these units I can only assume you are talking to the VFD's through a field wired communication ? If not your going to have to make what you are...
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    Replace the MBB board and your problems will go...

    Replace the MBB board and your problems will go away.
  6. What is your actual oil pressure when the...

    What is your actual oil pressure when the compressor is running ?
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    DP.XR- should be set for no for your unit.

    DP.XR- should be set for no for your unit.
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    Suction or discharge what refrigerant ?

    Suction or discharge what refrigerant ?
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    When you say Carrier do you mean tech support...

    When you say Carrier do you mean tech support since you are doing all the field troubleshooting (Sigler)?

    I would like to know what the suction pressure transducer type says.
    Configuration >...
  10. I think you mean IR?

    I think you mean IR?
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    You could always use a nitrogen purge to keep...

    You could always use a nitrogen purge to keep condensation from forming in the evaporator.
  12. I would contact a mechanical contractor in your...

    I would contact a mechanical contractor in your area that deals with Commercial installations.
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    You may not realize it but you have probably seen...

    You may not realize it but you have probably seen that board if you have worked on many 30XW,XA, RB's.
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    Sent you a PM.

    Sent you a PM.
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    Most Aquasnap chillers will have a leaving water...

    Most Aquasnap chillers will have a leaving water high temp limit of 70 dF. You will need a mixing valve if your process is that critical.
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    Are you sure there is not an issue with the drain...

    Are you sure there is not an issue with the drain pan ?
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    If I was a betting man I would say this will fix...

    If I was a betting man I would say this will fix it.
  18. Replies
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    Maybe some better language on #4 would be a good...

    Maybe some better language on #4 would be a good start.
  19. Just out of curiosity how is it working ?

    Just out of curiosity how is it working ?
  20. I am not sure I have ever seen a PSIO on a DK...

    I am not sure I have ever seen a PSIO on a DK unit. Those units gave the Flotronic style motherboard . The PSIO is a black module whereas the Flotronic motherboard has a potentiometer and push button...
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    I will take a stab at this . I think you are...

    I will take a stab at this . I think you are talking about a Bacnet/LON integration board that mounts directly on the MBB. You will probably have to coordinate with your controls tech and a Carrier...
  22. The unit can be field modified what is your...

    The unit can be field modified what is your designed leaving water temperature ?
  23. Replies
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    Could the Belimo #1 be a fire damper and the...

    Could the Belimo #1 be a fire damper and the second one be a relief air damper. My guess is that the AHU runs 24/7 therefore if this caption is correct the electrical room could have been below the...
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    I have heard the same thing but not sure what you...

    I have heard the same thing but not sure what you mean contaminated compressors.
  25. Sure just use the tstat multi control type.

    Sure just use the tstat multi control type.
  26. Replies
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    What kind of failure are you seeing ? Inquiring...

    What kind of failure are you seeing ? Inquiring minds want to know.
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    We'll a restriction would give you some higher...

    We'll a restriction would give you some higher SH. Maybe your TXV's a little oversized or now enough load on your evaporator ?

    Plus I think it's a 38APD.
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    When I had an issue like this there was a...

    When I had an issue like this there was a removable screen/strainer where the sock attached to the AHU. It was plugged up. I took it out and cleaned it a problem solved. Just something else to check.
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    Fixed orifice.

    Fixed orifice.
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    Hate to say it but I would have changed the drier...

    Hate to say it but I would have changed the drier while you had it pumped out just to be sure.
  31. My gues is that the AHU was probably matched with...

    My gues is that the AHU was probably matched with a McQuay 2 speed compressor . It probably matched the coil staging. Your stuck running all or nothing, maybe add some hot gas if possible.
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    Have you tried disabling the digital scroll to...

    Have you tried disabling the digital scroll to see if that helps ?
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    Just to add. I can see a possible issue if that...

    Just to add. I can see a possible issue if that condensing temp doesn't rise with that resistor on there.

    Alert Codes 143, 144, 145 (Failure to Pressurize) — Alert codes 143, 144, and 145 are for...
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    Did you verify that the SCT sensor for circuit C...

    Did you verify that the SCT sensor for circuit C was not broken and just hanging in the air. It's supposed to clamp on to the condenser coil.
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    If he offered up as much information to the...

    If he offered up as much information to the counter guy that he did here I can see why he didn't get an answer.
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    Definitely not worth it plus I don't think VAV is...

    Definitely not worth it plus I don't think VAV is allowed for residential here . Gonna need fire dampers and other safety devices plus with a common return your going to get cross contamination (...
  37. Makes sense now as to why you were reading the...

    Makes sense now as to why you were reading the high DP. Just sounds like your system was low on water, depending on the makeup type there could be a strainer in there too.
  38. Is there a pump package on this chiller or is the...

    Is there a pump package on this chiller or is the pump external of the chiller ?
  39. Yep clear as mud.

    Yep clear as mud.
  40. There are actually (6) different combinations of...

    There are actually (6) different combinations of condenser fan motors that can go on that chiller the serial number will tell the parts guys what you need? You will also need to know what Motor...
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    If that's the case you could always upgrade it to...

    If that's the case you could always upgrade it to the motor master 5 if price is not a problem.I have never heard of a timing issue if that was the case a time delay relay could be thrown in there.
    ...
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    The wiring diagram shows an aux contact to keep...

    The wiring diagram shows an aux contact to keep the low and high speed contactors pulling in at the same time .
  43. Replies
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    Can you duplicate this using test mode ?

    Can you duplicate this using test mode ?
  44. Replies
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    Is you auxiliary contact on your high speed...

    Is you auxiliary contact on your high speed contactor working properly ?
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    I would say it's pretty recent but what you have...

    I would say it's pretty recent but what you have there is the compressor serial number and not the actual chiller model and serial number. My guess is that it's a 19 series chiller.
  46. What kind of unit?

    What kind of unit?
  47. NSTV is not going to download to an EXV driver...

    NSTV is not going to download to an EXV driver board the only benefit you will have is to see the EXV maintenance tables. What type of chiller are you working on there?
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    I think hvac69 may have fixed it for you Joe did...

    I think hvac69 may have fixed it for you Joe did tech although it sounds like you may have 3rd party controls on your unit. Your unit does have a DP switch which does have the ability to monitor fan...
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    You are correct so I read it wrong. Now I see the...

    You are correct so I read it wrong. Now I see the 50hz info below in bold lettering .
  50. Replies
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    Why not put a loss of charge switch on the high...

    Why not put a loss of charge switch on the high side of the system?
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