First replacement unit R22 to R410A high efficiency

JJboy

What are the requirements to replace a R22 unit to R410A unit?
Do I have to change the linesets or just need flush?
Any restriction on working with high pressure?
The new unit has the same ton so I do not need a new load calculation right?
The linesets are 3/8" and 3/4 and the unit has 3/4 and 7/8. I just need adapters, dryer filter etc

Thanks Yall

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**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.

beenthere

Basically, if you handle/treat R410A the way you were suppose to handle R22, you will be fine.

JJboy

I use Silver 15% rod.

The customer is not complaining about the performance of the old unit. I'm just thinking in advance.

What size line set do the install instructions say to use.
what happens If I already have the line set installed?

__________________

**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.

beenthere

Kind of depends on the size the manufacturer said to use, and the length.

Marty S.

Did you leave the old evap coil or replace it?

JJboy

I'm going to replace everything. I'm trying to keep only line set.

__________________

**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.

newtech

No flush is needed on the line set, but it must be sized correct

JJboy

I thought I got a problem with the oil used on R410A to be different of R22. This is the reason we need to flush to clean the oil contamination from R22.

Can you explain better this sized correct?

__________________

**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.

newtech

( You need to install the CORRECT LINE SIZE that the mfg has spec'd )

yuri

You DO need to flush it. Read those install manuals I gave you links for. There is a product called Rx-11 flush also. Expensive but works REAL well.

http://www.nucalgon.com/products/tot..._rx11flush.htm

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newtech

No, you don't according to Emerson....

JJboy

The idea is to install the new high efficient system that fit the lineset already installed. If I need to change the lineset. it's gonna be a lot construction work. I don't think the costumer wanna destroy his floor.

__________________

**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.

newtech

Then pass on the job. The line size must be correct

beenthere

Post the size of the lines set and the size of the unit.

yuri

Yes you do according to Lennox. It gets down to a matter of professionalism and whether a guy wants to spend the time and $$ to do the job to what he considers a professional job. Some guys flow nitrogen when welding others don`t. My company has LONG term customers so we don`t want contaminated systems and premature failures if possible and are willing to go the extra mile to keep the system clean. Lots of guys are to cheap to install filter driers, low ambiant controls or even pull a deep vacuum. We can debate semantics forever.

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