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Type: Posts; User: coldjoe

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  1. Replies
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    Getting harder now to sell a decent make of air...

    Getting harder now to sell a decent make of air conditioner or commercial fridge on this side of the pond with these cheap imports being brought in by the shipload. People are only too happy with...
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    R32 is in use in japan in splits and is now...

    R32 is in use in japan in splits and is now starting to be introduced in europe. Its gwp is about 1/3 of r410a but the kicker is its classified as mildly flammable. I heard it turns into right nasty...
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    R22 will run no problem with polyester oil , The...

    R22 will run no problem with polyester oil , The problem would be the capacity of the system would nearly half,
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    1,506

    Why not just fit a non return valve to the...

    Why not just fit a non return valve to the discharge line ,would solve backflow if thats the only issue.
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    I have worked on these type freezers a lot ,...

    I have worked on these type freezers a lot , drag unit outside ,line tap and blow off ,cut out drier and flush with nitro couple times, then weld away to your hearts content.Remove line tap weld in...
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    Good to hear you are getting to the bottom of the...

    Good to hear you are getting to the bottom of the problem .A most unusual conclusion goes to show we are all still learning everyday.
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    I would disconnect the oil equalising system...

    I would disconnect the oil equalising system altogether ,you have a system with individual oil control no point in haven it if your going to link all the sumps.To my mind after reading all the posts...
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    Another possibility is that one of the henry...

    Another possibility is that one of the henry float valves could be stuck open .You really need to start isolating oil lines one at time assuming you have valves to see which compressor is moving the...
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    Is there any unloaders on the compressors . I...

    Is there any unloaders on the compressors . I have come across faulty unloader heads on similar satellite compressors to cause them to pump oil like theres no tomorrow.
  10. I have come across similar syptoms with 407c...

    I have come across similar syptoms with 407c where they were vapour charged by mistake,Might be worth reclaiming gas and recharging with liquid from a virgin cylinder.At the least it would clearly...
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    4,162

    Thanks for clearing that up i knew there had to...

    Thanks for clearing that up i knew there had to be some issue with it because if fitting a 410 using existing pipework most air cons use a flushing cycle to collect the mineral oil out of the system...
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    Good point could be an old wives tale but id...

    Good point could be an old wives tale but id prefer to be careful than to be caught.
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    ya i know its a 410 was just saying no real need...

    ya i know its a 410 was just saying no real need to flush as there be no sludge or anything formed as the 22 would mix ok
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    A lot of daikins in around europe if you look up...

    A lot of daikins in around europe if you look up a particular european forum you should find all you need to know,cant comment myself as have not worked on many of them
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    Id just change the gas . r22 has no problem...

    Id just change the gas . r22 has no problem mixing and running with poe oil ,Its the 410 that wont mix with the 22s mineral oil
  16. Thread: oxy/acet

    by coldjoe
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    3,752

    405081 Brazing glasses can look cool

    405081 Brazing glasses can look cool
  17. Replies
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    2,493

    Get good results with my fieldpiece srl2...

    Get good results with my fieldpiece srl2 ,rechargeable and sturdy plus nice attachments
  18. Thread: oxy/acet

    by coldjoe
    Replies
    32
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    3,752

    Tinted saftey glasses rated for brazing can be...

    Tinted saftey glasses rated for brazing can be bought in several places online .A coworker of mine who was brazing daily on sites is now having serious trouble with sight loss.Its probably too late...
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    Another advantage of placing in doors is when the...

    Another advantage of placing in doors is when the drier is near its capacity if it gets heated up on a hot day outside it will lose moisture back into the system
  20. Replies
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    985

    I always nick with a hacksaw first even if i know...

    I always nick with a hacksaw first even if i know theres no gas in ,seen a coworker getting a very nasty burn when he cut into system he thought was pumped down .He locked out the case with its own...
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    Great posts dowadudda ,very informative,not used...

    Great posts dowadudda ,very informative,not used to low ambient systems here and very little hot gas defrosts used in supermarkets
  22. Replies
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    The only cases i work on are small 100 grams but...

    The only cases i work on are small 100 grams but most supermarkets here are now bringing it in on all the upright cases aswell,correct there is no stenching agent in r290 a lot of people might not...
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    the real engineers came before us like my father...

    the real engineers came before us like my father ,they worked with flammable ,exsplosive and they had no recovery units or vacuum pumps or any stuff like that ,they were real techs and pioneers,laid...
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    My father is a retired tech too he got a bad...

    My father is a retired tech too he got a bad burn on his hand from a metyl type refrigerant years ago,i was crapping myself the first hc fridge i fixed but its like everything else you just get used...
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    That video is only showing how to service without...

    That video is only showing how to service without a flame,its perfectly acceptable to take a torch to a propane system once the dryer has been cut out and the system flushed with nitrogen a couple of...
  26. Thread: New to service

    by coldjoe
    Replies
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    2,267

    these house type units not really in use here ,do...

    these house type units not really in use here ,do they not come factory charged ,most ac here comes charged with specific weight of charge to be added for extra lineset lenghts ,makes life easy
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    Luckily in europe its legal to vent hydrocarbon...

    Luckily in europe its legal to vent hydrocarbon refrigerants .There are limits to the charges allowed in indoor cabinets 1kg in a basement,1.5kg on a shopfloor,2.5kg in a storeroom.thankfully the...
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    Have been repairing r290 chest freezers here for...

    Have been repairing r290 chest freezers here for a couple of years no explosions no dramas , best way to work on these is to wheel them outdoors.
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    Yes also have one ,great if you can silence the...

    Yes also have one ,great if you can silence the area your looking,mighty in plant rooms power everything down and youll find the tiniest leaks .
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    Problem with fan cycling on single units is it...

    Problem with fan cycling on single units is it plays havoc with sight glasses .if fan speeds up quickly its drops condenser pressure quickly and pulls liquid back into condenser and bubbles in the...
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    Yes r407f starting to be put into medium temp...

    Yes r407f starting to be put into medium temp racks here .R407A ,C & F all made up of the same 3 gases just different percentages (R32,R125,R134A)
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    Sounds like its possibly been overcharged .I...

    Sounds like its possibly been overcharged .I would ignore sight glass and charge system measuring subcooling off condenser and superheat off cooling coil
  33. Replies
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    I have come across this alot also.they seem to...

    I have come across this alot also.they seem to suffer on compressors with a sweatback to the suction with the water running down onto one spot on the heater
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    I use a digital manifold for service work ,but...

    I use a digital manifold for service work ,but use a 4 valve analog to vacuum ,commission new plants .
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    yes thats it,very handy device for its cost.got...

    yes thats it,very handy device for its cost.got mine posted out from a crowd called srw in the uk .they send our company regular fliers of their wholesale products.they have a website also.
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    I have a small primalec ultrasonic tester and...

    I have a small primalec ultrasonic tester and find it invaluable also use a dtec select sniffer never fail to find leaks between the two
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    whatever you do dont put it on here youl be sent...

    whatever you do dont put it on here youl be sent a message that looks very worrying dat inda end is nothjng
  38. Replies
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    have you checked for partially blocked drier

    have you checked for partially blocked drier
  39. Replies
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    from experience have to be careful changing any...

    from experience have to be careful changing any old system to 404 gas it will clean the system and will deposit years of gunge at driers ,filters sumps etc regards
  40. Thread: Poor Brazing

    by coldjoe
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    4,199

    looks like an a/c direct connection compressor...

    looks like an a/c direct connection compressor not meant to have rotalocks?
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    reply

    thanks for the tips guys
  42. Replies
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    Digital manifolds

    hi guys recently purchased a digital manifold for the single purpose of getting more accurate readings at low pressure of r290 on static freezers ,turned out i had to send them back as they wouldnt...
  43. Thread: addatives

    by coldjoe
    Replies
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    983

    ive seen compressors seize after 24 hrs operation...

    ive seen compressors seize after 24 hrs operation ,exspansion valves blocked completly on systems where leak test dyes have been been used ,you would want to be really stuck to use these, also most...
  44. Replies
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    1,101

    hi we used to fit low pressure switches on these...

    hi we used to fit low pressure switches on these machines to stop the water pump until they froze the barrel evenly made for much softer starting not jumping all over the place also extra salt might...
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