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168 posts

Master Geek
+1 received by user: 24

  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.

93 posts

Master Geek
+1 received by user: 10

  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.





168 posts

Master Geek
+1 received by user: 24

  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.

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