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215 posts

Master Geek
+1 received by user: 37

  Reply # 2052896 10-Jul-2018 19:51
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We have a general rule of thumb that heat pumps 5.0 kw and over had to be wired back to the switchboard. We would connect into a power ciricuit if under 5.0 kw and it’s not a kitchen circuit otherwise the circuit breaker trips when the heat pump is running and you use the toaster or kettle etc. We always get an electrician to do this work.
There are lots of cowboys out there doing heat pump installs, many are illegally done but they are generally cheap installs. Only a registered electrician can legally do fixed wiring on your house and you should get an electrical COC. If you are not happy or are concerned about the workmanship get an electrician to inspect it and/or get the EWRB involved.
Most electricians are keen to protect their jobs and stop cowboys.

105 posts

Master Geek
+1 received by user: 12

  Reply # 2053019 11-Jul-2018 00:07
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Hello all guys, there is nothing to update today since the installer didn't contact me yet.


I am writing a complain letter with facts I found together with detailed photos. It will be sent to both Noel Leeming and Fujitsu tomorrow night if the installer doesn't contact me tomorrow daytime.




nickb800: What I find is that it is not ok to wire the heat pump into my old rewireable ceramic fuse since a rewireable fuse is only allowed to install 2 plug sockets, anything more that that will require an MCB. It can be remained in service, but it is not allowed to have any wiring added to the circuit, and it is not allowed to be used for fault protection, or overcurrent protection of newly installed cables.




Kickinbac: Yes I found the following document from EECA, in section 9.0 it is stated “Inverter units with a heat output of 5kW or greater must be connected to a separate circuit”. But it is a good practice guide so not law enforced. He will not get away with not providing a valid CoC for the installation.






215 posts

Master Geek
+1 received by user: 37

  Reply # 2054553 11-Jul-2018 20:06
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I have two heat pumps, both on dedicated circuits. I'd talk to NL and have this redone, otherwise I'd try to escalate to whoever registers electricians or such.

What is the running current of your heatpumps? You might simply have larger models. Meaning that the running current could put the circuit right at its limit. Or maybe your existing circuits can't be extended while still complying with the voltage drop rules. Meaning putting the heatpump on a dedicated circuit would probably be cheaper than replacing the cable in that circuit with a larger size.

Not sure about current, but they're 7.5kw heating 8.5kw cooling, which is larger than average. That's probably pushing a bit under 10A.

I wasn’t intentionally quoting that! I just read through it again as had read it several years ago.

939 posts

Ultimate Geek
+1 received by user: 39

  Reply # 2064734 30-Jul-2018 04:59
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Any resolution?



105 posts

Master Geek
+1 received by user: 12

  Reply # 2068321 5-Aug-2018 19:12
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bfginger: Any resolution?


Well, I am still in a waiting status... But here are what happened so far:


12-July: I sent a complain letter to both NL and Fujitsu, no reply from NL but Fujitsu replied in 2 hours saying they will contact the installer. And after another 30 minutes(well, I waited 4 days for this call) the installer called and said they will come back on 16-July to fix everything.




16-July: the installer came and sealed the outside isolating switch with PVC solvent, replaced the old ceramic fuse with a 20A circuit breaker, but without a dedicated circuit. He said since I will no longer plugin a heater to the wall socket so the 20A circuit breaker will be enough for both the heat pump and all my equipment. He also tidy up things like install a drain pipe to the outside unit instead letting the drainage directly pouring on my firewood.


The installer also took a look at the humming noise that is very noticeable in living room. He identified the humming is coming from the outside unit and carried along with the 6 meters pipe that fixed to the wall. The noise from outside unit itself cannot be heard, but it produces a vibration when running at a certain speed and that frequency just happened to vibrate the whole pipe that are firmly attached to the wall, and made the wall goes humming. He said he will come back in a few days to fix this.


I emailed Fujitsu regarding all the work the installer has done.




18-July: Fujitsu replied and said things should be all good, and regarding the circuit, according Fujitsu installation instructions, it is advised to install the heat pump on a dedicated circuit but by the circumstances given, this work is acceptable and my 6 years warranty will still be valid. And they will send a tech in 2-3 weeks when the tech visiting Dunedin.




Now: Nothing heard from the installer regarding the humming noise he promised get back in a few days from 16-July. And nothing from Fujitsu tech either... I will call the installer again tomorrow since that's 3 full weeks of waiting I think that's long enough for "a few days".

15642 posts

Uber Geek
+1 received by user: 3050


  Reply # 2068441 6-Aug-2018 08:28
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Here are some updates:


I went to their office this morning told the receptionist that I am worrying about the safety of the installation, but the receptionist told me the heat pump is meant to be installed onto the wall socket and is perfectly safe.



Pretty cool that they even get the receptionist trained as an accredited installer, so that she can comment. She probably looked in detail at the install process for your one in their records.... yeah right

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