Air conditioning units require a certain RCD mcb Breaker type and rating
electrical supply ©14/07/2016
Since the advent of
Inverter heat pump air conditioning there is the occasional problem with
electrical RCD breakers going out due to rating issues. Because inverter
air conditioning units use a DC driven compressor there can be issues
with the transfer from AC to DC which creates a lot of EMF thus causing
the RCD mcb breaker to blow, the inverter board uses the Hertz supply
going to the compressor to reduce or speed it up and for some reason low
rated i.e 30mA RCD's have a rating problem.
The biggest problem
with an underrated RCD breaker is that it can be a periodic issue, i.e.
the air conditioning units work for 2 months then all of a sudden a
issue arises where the supply blows. The obvious first thought is that
the inverter air conditioning unit itself has a major problem such as a
PCB or compressor fault. This can waste valuable site time and customer
down time while a fault is attempted to be rectified and on occasion
parts being replaced.
The now obsolete but
easier to electrically supply, fixed speed air conditioning systems used
a direct on-line motor compressor, either the compressor was Off or On
according to the thermostat requirements. This made them an easer to
rate electrically as they were a inductive rated load which usually
meant using a C type breaker with no consequence to a RCD. The fixed
speed models produced no high output EMF because there were no
inverter boards inside the outdoor unit with heavy electronic board
based triacs and coils producing heavy electrical noise.
Which RCD Breaker Is
Best To Use With Inverter Air Conditioning
It is best to use a (greater than) 100mA RCD breaker as this will give the electrical supply sufficient support to hold in while the air conditioning inverter system ramps up and slows down. Many electricians are unaware that air conditioning systems require a rating high than 30mA and it has to be said most of the time a 30Ma RCD will work. But if you are a electrician of air conditioning engineer with a issue with a RCD which keeps blowing it just might not be rated for the project.
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