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  1. Replies
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    Thanks

    Thanks
  2. Replies
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    daikin defrost problems

    Hi Guys. I normally work on commercial refrigeration plants, but was asked to look at a Daikin heat pump because it kept on icing up (outdoor coil) on heat mode. I reclaimed and recharged the system...
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    Blocked filter drier

    I got called to a domestic Daikin Heatpump and found that the compressor had seized and that the unit displayed a E6 error. I replaced the compressor and charged it up with R22. After weighing in the...
  4. Thread: Star or Delta?

    by Drew1
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    Thanks for all the advice. If I can connect it in...

    Thanks for all the advice. If I can connect it in star or delta , cause our line voltage is 420v which would be better?
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    No I dont have any experience with them. That is...

    No I dont have any experience with them. That is why i put the question to the forum, But thanks for the advice.
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    Mysterious Gray tank on -86c lab freezer

    Working on a sanyo -86c lab freezer which runs on a cascade system I noticed a gray shape that i thought was a third compressor. It is the same size as the other 2 compressors and looks identical...
  7. Thread: Star or Delta?

    by Drew1
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    Star or Delta?

    I am installing a Copeland semi hermetic compressor and have noticed on the name plate that is states that the motor can be connected in star or delta (DOL) or in star delta and they have provided...
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    I am assuming that we are having liquid coming...

    I am assuming that we are having liquid coming back down the discharge line into the oil sep during the off cycle.
    The strange thing is that when i arrived on site the oil return line was freezing...
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    Frost on oil return line?

    I arrived on site to find the oil return line from the oil seperator to the compressor icing up and the compressor then tripped on oil failure. The oil had been foaming and the sump was ice cold. If...
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    I have had issues with most types of defrost: 1)...

    I have had issues with most types of defrost:
    1) Electric is not easy to change elements.
    2) Hot Gas loosing its heat

    I now have an evaporator coil mounted 10m from the floor in a -30c room....
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    Hi, I cannot remember which VRV model it was (...

    Hi,
    I cannot remember which VRV model it was ( the job was a while back) , but what we did establish was that in one of the mechanical switch boards there is a carel stat that changed over the...
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    Mycom Service Manuals

    Does anyone know where I could download Mycom serive manuals?
  13. Why psia instead of psig for compression ratio?

    When we refer to compression ratio why do we need to use the psia pressures and not use psig which would be easier?
    Surely we could adjust the ratios to suite psig?
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    Thanks guys. That does help.

    Thanks guys. That does help.
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    What pressure to unload?

    Generally I work on commecial refrigeration systems, but have been asked to commision a shop AC system. It is a cooling only system running on 134a. The compressor has 2 unloaders on the head and the...
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    Old daikin VRV system

    Generally I work on commercial refrigeration systems, but was asked to see if I could fix a fault on a 2 pipe Daikin VRV system. The system has 5 indoor units connected to 1 x VRV outdoor unit. Each...
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    I would if I could. The walls are 3ft thick so it...

    I would if I could. The walls are 3ft thick so it wouldnt be easy. It is only a chiller running at 2°c so there isnt a defrost period. Its just strange to see that the room runs between 2 & 4° for a...
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    Yes the bulb and the body of the stat is in the...

    Yes the bulb and the body of the stat is in the return air stream. I thought this would give a more accurate reading of the room temp? It is mounted on the wall about 400mm from the back of the...
  19. Thread: truck stock?

    by Drew1
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    One of the more important items I carry is my...

    One of the more important items I carry is my mobile phone with all the technical support numbers in it. The sytems and controls are getting so advanced that to understand them all is difficult.
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    Has anyone used the totaltest by total line (...

    Has anyone used the totaltest by total line ( Carrier Corp)
    You dont need to take an oil sample. It comes with an schraeder valve applicator and 5 x test tubes that measure moisture and acid content...
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    Thermostat in Coldroom?

    I have installed a Refco spdt -30/30c stat inside a coldroom. It has been set at 2c and seemed ok. Now every few days the room runs down to -5c, but then recovers again. I have put a temp logger...
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    I found the capillary tube of the texv cracked...

    I found the capillary tube of the texv cracked therefore causing the restriction. Thanks for all the advice. Still strange that the change over valve suction was heating up as the system pumped down??
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    I will check for restrictions. From what I can...

    I will check for restrictions. From what I can see there are no check valves, only what must be bi directional TEXV cause the refigerant seems to flow fleely in one direction and then restricts in...
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    Heating cycle hiccup!

    I have been busy working on a reverse cycle heat pump and the system works great on cooling, but as soon as i change over to heating all 4 pipes on the change over valve get hot and my compressor...
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    The vent is wired and working. Could be worth...

    The vent is wired and working. Could be worth trapping the drain as moist air could be drawn in there and expelled out the vent. I havnt seen that before but it makes sense.
  26. Thread: Down to Earth

    by Drew1
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    And if the motor is an hermetic compressor we...

    And if the motor is an hermetic compressor we cannot turn by hand ? can we check with an ampmeter on the earth wire?
  27. Thread: Down to Earth

    by Drew1
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    When a compressor bearings have worn a bit and...

    When a compressor bearings have worn a bit and during running we have the stator touching the rotor the system would go down to earth to a split second??
    When we then meg out the motor it could show...
  28. Thread: Burn out!

    by Drew1
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    1,807

    Thanks for the advice.

    Thanks for the advice.
  29. Thread: Accumulators?

    by Drew1
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    Good advice and link. Thanks.

    Good advice and link. Thanks.
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    Thats the way I see it. Just strange to see these...

    Thats the way I see it. Just strange to see these systems that are mass produced, being sold all over with these design errors. doesn't make the poor technicians life any easier!
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    The fans turn off during defrost and there is a...

    The fans turn off during defrost and there is a fan delay. I have watched the system through a complette defrost and all seems good, drain is clear , no excessive ice build up on the coil. The...
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    Condensation in freezer room

    I have been working on a new freezer room and have noticed ice on the walls and floor. The room does not seem to have been sealed with silicon where the panels have joined. Could this be causing the...
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    Hot Gas or Change Over Valve Defrost

    Living in Tasmania at ambients of about 3°c I am finding it difficult to keep some of the AC coils clear of ice build up on the outside unit during heating function.
    Some have hot gas defrost which...
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    What is wrong with using dye. Does it make our...

    What is wrong with using dye. Does it make our lives to easy? On the wholesalers shelves there is a range of uv dyes and other pretty colour dyes.Why not?
  35. Thread: Down to Earth

    by Drew1
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    Thanks hvacpope. That link is a good read.

    Thanks hvacpope. That link is a good read.
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    Thanks for the detailed input Ice. Lots to think...

    Thanks for the detailed input Ice. Lots to think about!
    I found the leak on the condenser.
  37. Thread: Burn out!

    by Drew1
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    So I should run the system for a bit , check for...

    So I should run the system for a bit , check for acid, check for pressure drop across drier. If neccessary replace drier?
    Sounds good.
    With a 2 or 3 pound pressure drop you could loose maybe 2%...
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    If this statement is true then why bother with...

    If this statement is true then why bother with psia at all in the calculations?
  39. Replies
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    So we are saying that the system pressure stays...

    So we are saying that the system pressure stays the same but due to the pressure of the atmos on the guage the reading on it will be the sum of the atmos pressure and the system pressure?

    Ealier...
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    Im also battling with this one:( Wouldn't...

    Im also battling with this one:(
    Wouldn't 60psig be the same if we where at sea level or at altitude in a sealed system?
    The only thing that should influence the pressure would be a leak or...
  41. Thread: Burn out!

    by Drew1
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    1,807

    Sounds great!! Never heard of them. I need to...

    Sounds great!! Never heard of them. I need to find some.
  42. Thread: Burn out!

    by Drew1
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    1,807

    The old compressor oil is acid , but how do I...

    The old compressor oil is acid , but how do I check the new compressor's oil after a few days running to establish how much further I need to go with the clean up? Do I need to remove the compressor...
  43. Thread: Burn out!

    by Drew1
    Replies
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    1,807

    Its a selfcontained ducted room top aircon system...

    Its a selfcontained ducted room top aircon system with 2 x 100000btu scroll compressors. The compressor contactor lost a phase and the compressor did not have a contactor overload to protect it. It...
  44. Thread: Burn out!

    by Drew1
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    1,807

    Burn out!

    Ive had a compressor burn out recentley and have been amazed at the varing opionions of qualified techs as to how approach the situation? recovering, flushing , burnout driers , repeat ect.... ??...
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    Now Im getting confused:o Is it relevant cause...

    Now Im getting confused:o Is it relevant cause it is a hermetic system?

    And how can psia be equal everywhere? Surely atmos pressure must vary?
  46. Thread: Down to Earth

    by Drew1
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    With a normal multimeter (even though it still...

    With a normal multimeter (even though it still measurers Megs) it doesnt have the pressure( volts) to 'leak' down to earth? Therefore we need to use a megger (1000v).
    So a multimeter reading of...
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    Surely with advanced technology the manufactures...

    Surely with advanced technology the manufactures could produce an oil that has a dye in it. Which such little differences between the compressors these days you would think they would try that for a...
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    Nice one!

    Nice one!
  49. Thread: Down to Earth

    by Drew1
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    At what mega ohm reading would a standard earth...

    At what mega ohm reading would a standard earth leakage system trip on? I now understand that different products can have different acceptable down to earth readings, but at what point would it be...
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    Thanks for all the input! With regard to the...

    Thanks for all the input!
    With regard to the p/t=p/t rule why does it have to be absolute pressure(psia)? If it is a hermetic system?
    How much do we add at sea level to psig to get psia?
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