Refrigeration Gauges or Refrigeration Manifold Gauge Set:
The left hand Gauge is the low-side gauge and it is blue.
The Right hand Gauge is the High-Side gauge and it is red
Ports:
The low-side port is directly under the low-side gauge , the hose
is also blue
The high-side port is directly under the high-side gauge , again
the hose is also red .
The centre port,or ( charge/evacuation port) is a common port
between the low and high-side ports, coordinated with a yellow hose. This port
is used for either, charging the refigeration system or for evacuating the
refrigeration system.
Valves:
The low-side valve is located to the left of the low-side gauge.
The high-side valve is located to the right of the high-side guage.
Refrigeration
Low-Side Gauge:
This gauge is used to measure low-side pressure and temperature,
the two are directly related. to each other
Note: The low-side valve is front seated or turned all the way
clockwise in order to perform this function. ( Measuring temperature and
pressure)
High-Side Gauge:
This gauge is used to measure discharge or high-side pressure and
temperature, which are inter-related to each other
Note: The valve is front seated or turned all the way clockwise in
order to perform this function.
Centre Port:
You may charge vapour refrigerant , by turning the handle
counter-clockwise at the low-side, while leaving the high-side valve closed
The low-side is charged while the refigeration compressor is
operating
If you are evacuating or removing unwanted air, vapour, and
moisture, simply open the low-side valve by turning the handle
counter-clockwise.
To charge or evacuate the high side follow the same procedure,
turning the high-side valve counter-clockwise.
The high-side is always charged with a liquid refrigerant by inverting the
Refrigerant Cylinder, when the refrigeration compressor is off! ( Azeotropic
gases )
Some refrigerants must always be charged as a liquid ( Azeotropic
gases )R 134A isn't one of them. The Refrigerant Cylinder must be standing in a
"normal" upright position to charge R134A , as a vapour.
Always open the high and low-side valves when pumping down or
evacuating a system.
Note: Vacuum / Evacuate a refrigeration system with an evacuation
pump for at least 20 minutes. After evacuating close the valves, now you should
have a high vacuum registered on your gauges 20 to 30 hg. , if not you may have
a leak.
If you rapidly or slowly loose a vacuum, check for leaks.
If no leaks, the system you have evacuated should maintain a deep
vacuum.
Refrigerants
Some refrigerants require special gauges due to their properties ,
R134A is one them.
Although 134A may be charged as a vapour or liquid , many
refrigerants must be charged as a liquid. Generally charge R 134A as a gass
Azeotropic gases must be charged as a liquid.
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