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If there is 3 indoor units from one condensing unit
(6 pipes at outdoor unit) this is classed as a multi unit
All units will run correctly as long as they all require same mode, cooling or heating, if one unit decides to heat it will shut down until master unit decides to heat then it will start, for each unit to individually heat and cool there would have to be 3 pipes to each indoor,
If the installation is not done by an experienced AC technican who does not know the size of the piping , I would not recommend you to proceed further as you might end up with a faulty installation. Please get this work done by a person who knows the subject or else the pipe connections and fittings may not be good enough to prevent leak of the gas thereby reducing yourr efficiency and reduce cooling.
There is more to this than just fitting the pipes and I advice you follow them wisely.
please make sure your electrical connection to the compressor is correct and tighten. electricity supply is straight and not fluctuate i mean constant supply for unit and then change new run capacitor and make sure ground wire must connect to the air conditioner,s body and check copper filter and any other copper pipe is not block .
i think it cab be an electrical problem so check all electrical device and then re-install new compressor.
The simplest way of explaining this is as per the following. On your outdoor compressor unit there should be two pipes, one smaller diameter [high pressure] and a larger diameter pipe [low pressure]. Turn your A/C on inside the house and then shut off the smaller diameter pipe. Run the unit for a around 3 to 4 minutes and then check if the cooling is reducing from the unit inside the house. When you feel room temperature air [not cool] being emitted from the indoor unit shut off the larger diameter pipe and turn off unit. Isolate electrics, disconnect A/C piping and immediately seal the piping with good quality tape to prevent egress of dirt. When re-installing a quick purge of gas is usually only required to clear the lines if they were sealed properly and kept clean. Ideally running a vacuum pump is recommended but if care was taken then it may not be needed, as in many of my installations.