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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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    742

    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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    742

    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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    722

    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.
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