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PnF.SS17F <br />rA11C,,Fj <br />RECEIVEL) <br />P MAY 18 2015 <br />B Y R ENVIRONMENTAL <br />L E E <br />U L D <br />E L <br />0 <br />H H H <br />0 0 0 <br />S S S <br />E 19 <br />E <br />GAUGE MANIFOLD SET <br />One of the most important tools to the HVAC&R technician is the gauge manifold set. The compound gauge (blue) and <br />the high pressure gauge (red) are connected to the manifold, and the manifold is then connected by hoses to access ports <br />to measure system pressures. The compound gauge measures low pressure (psig) and vacuum (inches Hg.). The high <br />pressure gauge measures high side (discharge) pressure. The manifold is also equipped with a center port, (usually a <br />yellow hose), that can be connected to a recovery device, evacuation vacuum pump, or charging device. EPA regulations <br />require that hoses be equipped with low loss fittings that will minimize refrigerant loss when hoses are disconnected. <br />