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The high pressure side.
The condenser is on the high pressure (discharge) side of the system.
300psi high side and 80psi low side
Yes. The condenser is on the high side, and high pressure vapor goes from the compressor outlet directly to the condenser inlet.
That would depend on the type of refrigerant that is being used.
In regards to a water chiller unit, the terms low pressure and high pressure refer to the compressor, which takes low pressure and compresses it into high pressure gas, which is then turned into a liquid to cool the unit.
If your low side (evaporator coil) pressure is higher than your high side (condenser coil) while the compressor is running, your switching valve is in the reversed position. That is, you are in the heating mode of the heat-pump, and the pressures are reversed to provide heat into the home.
your freon is measured with gauges hooked up to low side of air condition unit the low side is the cold side high side is the condenser side WATCHOUT high pressure every unit has atag on it and let you know how many ounces to be put in low charge is bad but over charge is also bad
pressurre on low side should be be 70 psi and on high side depending on unit should be between 250 and 350
The low pressure (vacuum) side.
The refrigerant pressure for a residential air conditioner is around 75 psi for low side input and 260 psi for high side output. If the unit is turned off the pressure will be about equal to the ambient temperature.
Read the charging chart specific to the unit. Not all 410A machines will operate at identical pressures in identical conditions.