will dirty outdoor coil affect both head and side pressure?

[trane123]

It's a split A/C system, the head and side pressure measurement seems correct, but the system is not cool enough. It has high superheat and low subcooling. For a under-charged system, will a dirty condenser coil cause both the head and side pressure appear to be right?

[monkey spanners]

A dirty condenser effectivly makes the condenser smaller, so will raise the head pressure, this will have a coresponding effect on the suction pressure, my gut feeling is this will show its self more with a capillary system than txv but don't know for sure.

Personally if i have a doubt about a part of a system i like to eliminate it before concluding whats wrong, (possibly your system has a dirty condenser and is undercharged), why not give the coil a clean, it needs doing anyway, if it make no difference then you can move on to other areas and once the system is repaired it'll work all the better.

[coolhibby1875]

why not clean the coil and see if it makes a diff?

[coolstuf]

Hi, what is a side pressure?:)

[frederik79]

yeah what is side pressure ? hp lp oil pressure ...
side pressure = > lp ?

[coolstuf]

Maybe refrigeration works different in the US:D

What's the story Frederik, do you have a goverment yet? If you ask me, you are better of without one:off topic:

[trane123]

Before I cleaned the outdoor coil, the head pressure was at 200psi and side pressure at 70psi with outdoor temp at 73F. The A/C cools but is not sufficiently cool. The suction line is around 65C and liquid line is around 105F on a 87F day.

Now, I have cleaned up the outdoor coil, I will have tech come in do another pressure measurement sometime this week. Hopefully, the pressure drops and the tech can add some refrigerant to keep the A/C cool.

[coolstuf]

Side pressure:rolleyes:

[tcdmtcdt]

sounds like it definetely needs some cleaning before you can get the pressures running right and be able to get a better assessment of the problem