Hose Length

[AStudent]

From what I've been taught....most manufacturers recommend adding 3oz of refrigerant for every 5 foot of piping added to a system.

Would using 5 feet of hoses on your manifold gauges not screw up pressure readings since technically you added 5 feet to the system making it short 3oz of refrigerant?

[jpsmith1cm]

From what I've been taught....most manufacturers recommend adding 3oz of refrigerant for every 5 foot of piping added to a system.

Would using 5 feet of hoses on your manifold gauges not screw up pressure readings since technically you added 5 feet to the system making it short 3oz of refrigerant?

Not if you remove the hoses.

You've then removed the excess "piping"

[AStudent]

Sorry guess I should specify...would it not screw up the pressure readings on your manifold gauges while you are testing a system?

Or is it not enough of a change to matter?

[jpsmith1cm]

Sorry guess I should specify...would it not screw up the pressure readings on your manifold gauges while you are testing a system?

Or is it not enough of a change to matter?

On a small, critically charged system, it can.

[mjm88]

On a small, critically charged system, it can.

This is why we never hook up to critically charged systems unless your positive you have a refer issue. Also probably why alot of critical system don't have access ports...

[hvac wiz 79]

This is why we never hook up to critically charged systems unless your positive you have a refer issue.

Exactly

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[VTP99]

On critical charged systems i don't use hoses to check pressures.
Also it depends on how one sets there scale when charging.

[VTP99]

[QUOTE=AStudent;12608871] manufacturers recommend adding 3oz of refrigerant for every 5 foot of piping added to a system.

Are you talking 5' of liquid line add 3oz. ?

[AStudent]

[QUOTE=VTP99;12610151]

manufacturers recommend adding 3oz of refrigerant for every 5 foot of piping added to a system.

Are you talking 5' of liquid line add 3oz. ?

I believe it should specify in the installation instructions what the manufacturers recommended tubing length is, and how much refrigerant to add per so many feet of tubing added past that.

[AStudent]

That should be total system length not just the liquid line.

[hvac wiz 79]

On critical charged systems i don't use hoses to check pressures.
Also it depends on how one sets there scale when charging.

What do you use?

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[jnsrose]

Just the gauges with fittings.

[VTP99]

Just the gauges with fittings.