Just like the pressure gauges, blue for the LP side, red for the HP side and yellow for charging or evacuating. The manifold has a gauge glass at the centre which shows the flow of refrigerant while charging the setup.Ĭolor coded hoses are used to connect the manifold to the system. While charging the refrigerant, the valve next to the LP side is opened and the refrigerant flows from the refrigerant can (stored under high pressure just like your LPG cylinder) to the system (low pressure side) in the liquid phase. There is a valve mounted on either side which controls the flow of refrigerant through the 3 threaded ports on the manifold. It has a brass manifold with 2 pressure gauges - one for the low pressure side marked in blue (marked from 0 - 220 psi) and the other for the high pressure side marked in red (marked from 0 - 500 psi). The AC manifold setup is used to recharge or evacuate the refrigerant from the system and measure the pressures at the low-pressure (LP) and high-pressure (HP) lines. The type of refrigerant used in the car and and the quantity is indicated in a sticker stuck on the engine bay or on the hood.
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