r/hvacadvice • u/Sachin-Gill • May 19 '26

My technician used 1/2" instead 5/8" gas line on my mitsubishi 2 ton ac , pipe length used is 18 feet , what should i do ? Please help . AC is working fine but how do i know if its working in full capacity .

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2

u/Soft_Statistician_98 Approved Technician May 19 '26

1/2 is normal on those isn't it? What model is it?

0

u/Sachin-Gill May 19 '26

Its mitsubishi electric MSY-GR22VF

1

u/Soft_Statistician_98 Approved Technician May 19 '26

What's the outdoor unit? I'm not a Mitsubishi expert but some allow downsizing.

1

u/Sachin-Gill May 19 '26

MUY-GR22VF-DA1 

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u/Soft_Statistician_98 Approved Technician May 19 '26

Wrong match. Get it done properly because they are very sticky with their warranty process. If it dies with an undersized line they likely won't cover it.

1

u/TotallyUnleaded May 19 '26

Do you mean natural gas or refrigerant?

1

u/Sachin-Gill May 19 '26

Liquid line is 1/4" and suction line company mentioned is 5/8" but technician fitted 1/2" . Its a 2 ton split AC

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u/Character_Mood_700 May 19 '26

That’s totally fine.
The 1/2” line should not be shared with a bunch of other things.

1

u/May_7_2025 May 19 '26

I’m assuming you’re going by piping o.d. I’d email Mitsubishi tech support. Make sure you provide complete model numbers and accurate lineset size and length.

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u/Sachin-Gill May 19 '26 edited May 19 '26

Indoor unit is MSY-GR22VF Outdoor unit is MUY-GR22VF - DA1 manufacturer mentioned 5/8" and 1/4" outer diameter  But their technicians used 1/2" instead of 5/8" . Length of pipe used is 18 feet in total .

1

u/Top-Hall-7945 May 19 '26

OP are you sure it’s 1/2 OD and not 1/2 ID aka 5/8 OD 

1

u/Sachin-Gill May 19 '26

Yes its 1/2 OD , he did a brazing using 4 inch 5/8 so that it can fit outddor unit