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  • Users: YuriB
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  1. YuriB

    ABS hydro module's valves state while driving

    Thank you very much ! It is so hard to find answer to many questions in Internet literature - only asking on forums like this, brilliant ones.
  2. YuriB

    ABS hydro module's valves state while driving

    All manuals I found describe how hydro module of ABS works, when braking - how input and output valves are opening and closing depending on the braking processes - but no one describe their state during driving. I guess the input valve is of NO type and de-energized while driving. Is the...
  3. YuriB

    paralleling 2 current start relays

    Yes, one like for "starting relays for a refrigerator. When the motor current drops enough the contacts open the starting winding". They may not be sometimes available of a necessary size. Their paralleled coils would bear running winding current, but their contacts in series switch on and then...
  4. YuriB

    paralleling 2 current start relays

    Who think it is possible to effectively parallel current relays ? For instance, if a 1/2 HP one is not available, one can use in necessity two 1/4 HP relays (however, it is better to add by that an ordinary NO relay to bypass the current to the starting winding). Somebody done this ?
  5. YuriB

    Fan Coil Unit Pipe Connections

    I think the OP is right thinking whether a FCU is left hand or right hand depends on which side the water connections are. Air flow is the same.
  6. YuriB

    car code reader dedicated to car a/c ?

    Is there a diagnostic car fault reader/ clearer dedicated especially to car climate control ? Or some that is most suitable for that purpose ? (In case one does not need no other functions)
  7. YuriB

    a barometric manometer with 1 pa resolution ?

    I meant there seems to be no one being shown or sold in internet. Must be very expensive (however, if a usual relative pressure manometer is not - why an absolute pressure one should be ?)
  8. YuriB

    a barometric manometer with 1 pa resolution ?

    Why there are gas pressure differential manometers with 1 Pa resolution, but the barometric absolute pressure ones with only 10 Pa (0.1 mBa)resolution ?
  9. YuriB

    varying head

    I think it is only the speed the control is guided by .... the "third dimension" .
  10. YuriB

    varying head

    Are. Thank you!
  11. YuriB

    varying head

    Thank you seem to be right.
  12. YuriB

    varying head

    I understand it so. To set constant head control you imitate full demand (open 100 % valves), set the pump speed and balance the flows (adjusting the speed) untill all demands are satisfied. You note the head (for instance 10 m) and make it the SP. The pump then will be keeping this head. To...
  13. YuriB

    varying head

    In a closed water circulation system with 2-way valves at the consumers and the constant head control, when the valves close, the system resistance and head increases, the system curve comes up and the control through an invertor lowers pump's rpm. Pump curve goes down and the head is kept at a...
  14. YuriB

    mastercool crimper dies

    Thank you but if I understand correct one is OD another is "nominal size". The ommitted inconsistency in designation will stay yet for long time as it seems they simply "dont care" about what they sell.
  15. YuriB

    maximal head

    In short, I think, they planned the system with steel pipes but finally put instead PPR with the same OD. Hence big losses. There were other mistakes - idiotic - like two pumps working ... towards each other ! (this I had corrected already), in the heat exchanger (water/glycol) 2 flows moving in...
  16. YuriB

    maximal head

    It seems that the system was designed for steel pipes DN 50 but the "installers" put PPR pipe DN 50. Thus, smaller ID, big losses. The half of all the pipes are consealed under the walls - no possibility to redo. But I was also thinking about putting a !0 m pump. Thank you !
  17. YuriB

    maximal head

    Thank you. I am going to change one at a cite where some idiots installed small diameter pipes. The heater on the AHU thus receiving only about 0.7 m3/h of water (if my calculation is right) instead of the necessary 2 m3/h. Thanks again.
  18. YuriB

    mastercool crimper dies

    Does someone know why Mastercool 71500-8SRB Die set #8(13/32in Reduced Barrier), when sold as a part of the hose crimper set, becomes Mastercool 71500-8SRB Die set #8(1/2in Reduced Barrier), when sold separately ? (Note the hose size it is inteded for).
  19. YuriB

    maximal head

    No, no its not about a slug or hammer. My qwestion was whether a pump with about 2 times greater flow capacity than a second pump will indeed have the same maximal (7 m., in my case) head at no flow (for instance, with the valve at the discharge closed). So follow from the diagrams of the two...
  20. YuriB

    gas for soldering aluminum

    And thank you for the info that nitrogen does not suit as shield gas.

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