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| Is this Wiring Legal? (NSW) |
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| Labrat101:
--- Quote from: EEVblog on December 06, 2020, 07:15:25 am ---Another shot. Didn't bother to open it. Have sent a formal complaint and request for it to be fixed. There were three issues: 1) The wiring 2) The shared power point circuit and no way to isolate it without taking out half our house. 3) Bypassing of the obvious Solar Analytics system which has a dedicated aircon power monitoring circuit. --- End quote --- Dave I would also have the pipe work checked as well . If his wiring is that bad he is not a certified engineer . and the chances are that he has put kinks in the pipe work as well . The New gas have high flow rates compared to the old R22 and run @ higher pressures so any kinks in the pipe work will cause oil slugging at start and shorten the life of the compressor not to mention an efficacy loss . There are many thing that these Cowboy are not aware of including the positioning of the out side unit . Ie The Radiator (condenser ) Back of the unit MUST be a minimum of 30cm away from a wall . or if free stand Not facing south . all these are important if you want your AC to work at its MAX rating. The other very important thing . Did he purge the pipes of air . If this was not done Demand a replacement Unit . Or a full Vacuum of the system. Just a few percent of air will cause the oil to turn green . and the compressor will run hot and die within a very short life time . Update Edit :: You should have a seperate Fuse rated @ 7 x the normal operating current to allow for the Start current 15 to 20A MAX should be good for you . Don't use the fast trip fuses as they will flip on a hot day full load start . But on the other hand its better the AC fuse drops just one fuse and not the whole house It has a LRA (Lock rotor Amps ) of 39A :popcorn: RNS Certified HVAC Engineer & Tech designer ( London Uni, USA Cert . Carrier Cert. .Copland Cert .)) |
| Monkeh:
--- Quote from: Labrat101 on December 06, 2020, 01:01:00 pm ---Update Edit :: You should have a seperate Fuse rated @ 7 x the normal operating current to allow for the Start current 15 to 20A MAX should be good for you . Don't use the fast trip fuses as they will flip on a hot day full load start . But on the other hand its better the AC fuse drops just one fuse and not the whole house It has a LRA (Lock rotor Amps ) of 39A --- End quote --- 3.9A. Being inverter run a 16A circuit is likely specified. |
| Monkeh:
--- Quote from: EEVblog on December 06, 2020, 12:54:22 pm --- --- Quote from: deadlylover on December 06, 2020, 10:35:58 am ---I had a 3.5kw unit installed for the garage a few years back and they used the power from the power point. I was curious as well back then and IIRC you had to have an isolator switch (AS/NZS 3000:2007 Clause 4.19). Attached a pic of my install. (I think it was AUD1350 installed for the Daikin Cora 3.5kw, back to back) --- End quote --- Thanks. No isolator switch on mine. Only way to isolate is the 20A breaker for the power points which also takes out half of my house. --- End quote --- --- Quote ---4.19 AIRCONDITIONING AND HEAT PUMP SYSTEMS Airconditioning and heat pump systems incorporating a compressor shall be provided with an isolating switch (lockable) in accordance with Clause 2.3.2.2, installed adjacent to but not on the unit, which isolates all parts of the system, including ancillary equipment, such as head units, from the same location. --- End quote --- |
| bdunham7:
--- Quote from: Labrat101 on December 06, 2020, 01:01:00 pm ---Update Edit :: You should have a seperate Fuse rated @ 7 x the normal operating current to allow for the Start current 15 to 20A MAX should be good for you . Don't use the fast trip fuses as they will flip on a hot day full load start . But on the other hand its better the AC fuse drops just one fuse and not the whole house It has a LRA (Lock rotor Amps ) of 39A --- End quote --- One of the great things about these inverter-run split systems is that they don't have any of those requirements. The LRA is only listed out of tradition, there is no actual LRA for a unit like this. It will never draw more than the 3.9A except maybe a small inrush when first connected. |
| Labrat101:
--- Quote from: Monkeh on December 06, 2020, 02:11:41 pm --- --- Quote from: Labrat101 on December 06, 2020, 01:01:00 pm ---Update Edit :: You should have a seperate Fuse rated @ 7 x the normal operating current to allow for the Start current 15 to 20A MAX should be good for you . Don't use the fast trip fuses as they will flip on a hot day full load start . But on the other hand its better the AC fuse drops just one fuse and not the whole house It has a LRA (Lock rotor Amps ) of 39A --- End quote --- 3.9A. Being inverter run a 16A circuit is likely specified. --- End quote --- Inverters don't need the same rating Fuses as they have a build in soft start . The motor runs almost all the time but runs very slowly and have an unloading Valve so in the off cycle the compressor can still be operating unloaded so the current will be very low . Different makes and models do vary slightly . Where as Dave's compress is a rotary vein and is not an inverter model . --- Quote ---The LRA is only listed out of tradition, there is no actual LRA for a unit like this. It will never draw more than the 3.9A except maybe a small inrush when first connected. --- End quote --- Not entirely true When an inverter motor goes bad It will take out the board as well, & visa versa if the inverter board fails which they do quite frequently after about 3 to 4 years can burn out the compressor . Inverter motors Have a very nice LRA's and very destructive Pro's & Cons |
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