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Insufficient cooling in my mercedes 300e 1989. When i hook the manifold gauge and turn on the AC, the low side pressure shows ~70psi and high side 200 - 230psi(low side pressure stays constans and high side not to)

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1989 year would indicate the system uses the Old CFC R12 refrigerant. 70 PSI equals about 70°F . This is not enough pressure difference to give you any cooling. Sounds like your compressor has bad valves. Replace compressor.

Posted on May 01, 2008

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How do you put in 410a into Ac unit


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I thought I answered this You discharge pressure seems a bit high but if its hot inside th house it w might be right. but your suction pressure seems a bit low for that high a discharge pressure . let it run for a while and check it again. be certain that you purge a bit of gas when you hook your hose up just a little mind you

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Sincerely,
Shastalaker7
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I have the correct Manifold Gauges for checking the low and high side of the heat pump. How do I read the gauges to ensure that my system has the right charge? Outside ambient temperature is 85.4.


In order to know if you have the correct charge you must measure the subcooling since it is a txv unit. The outside unit will have the proper subooling you need printed on the data plate. Hook up you gauges and let thebunit run for 10 minutes, after 10 minutes check the high side pressure, that high side pressure will correspond to a saturation temp, write that number down then measure the temp of the liquid line and subtract the saturation temp from the liquid line temp, it should be the same as printed on tjhe data plate if it is higher than that add refrigerant untill you get whtas printed on tne data plate. Is there is no data plate use 12 degrees of subcooling.

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http://tinyurl.com/23ufvr2

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How do i hook my manifold gauges to my residental condensing unit to check pressures


The AC manifold gauges set have the three chambers: the low pressure chamber (left side), utility chamber (middle), and the high pressure chamber (right side).

When technicians connect the HVAC manifold gauge to the air conditioner units, he connects the low pressure side of air conditioner unit to low pressure gauge side.

If he wants to read the pressure in discharge line he connects the high pressure gauge hose to the air conditioner high pressure side.

The utility port (the middle chamber) is a place you connect the hose to vacuum pump, recovery units or add or remove refrigerant from AC units.

Air conditioning gauges is used to measure air conditioner units pressure within closed-system to evaluate or troubleshoot the AC units. Gauges manifold set is the most frequently used item when it comes to refrigerant or pressure.

Air conditioning gauge set allows the HVAC technician to check AC units operating pressures, transfer AC refrigerant, pressure test system, purge the system with nitrogen, and perform other necessary tasks.

The gauges manifold set includes the hoses, the manifold, the valves, the compound gauge (low pressure gauges) and high pressure gauge.

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How to use it


Subcooling - The difference between the temperature of the Small copper line (Liquid Line) and the high-side (red) gauge temp on your manifold

Superheat - The difference between the temp. of the Suction line (Big copper) and the low side gauge (blue) temp

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