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Introduction
The new vacuum and charging system, model RO-CADDY, allows to perform the vacuum in the cooling
system, to check for tightness, to recharge and check the working pressures.
The kit is composed of a double stage vacuum pump, a 4-way manifold, flexible hoses for connection, an
electronic scale up to 5 kg and a bearing for 1 lt and 2,5 lt refrigerant bottles.
The high vacuum pump is a dual stage rotary vane type, lubricated by oil injection, and fitted with a gas
ballast valve for the removal of the residual non condensable gases.
The high vacuum pump is equipped with a vacuum gauge and a solenoid valve on the suction side in order
to avoid oil from flushing back into the A/C system.
The gas ballast valve, which must be opened 3 minutes during the first phase of evacuation, prevents
condensation of polluted vapours in the lubricant and helps the pump start when it is cold.
B - Equipment assembly (Fig 1)
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Place the manifold on the vacuum pump by screwing the threaded 3/8"sae connection firmly.
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Connect the T1 low pressure flexible hose and the T2 high pressure hose to the manifold.
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Connect the T3 capillary tube to the manifold and place the V3 valve for the refrigerant bottle on the
electronic scale as in picture 1.
Warning! If you want to use the equipment with bottles and scales of different capacities or with
charging cylinders, please refer to pictures 2 and 3.
Preparing the vacuum pump for operation
The pump is delivered with no oil inside.
Before the first operation, fill the pump with the correct quantity of oil, taking it from the bottle delivered
with the kit (see specific instructions for vacuum pump).
Evacuation of Ro- caddy
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Close all the valves on the manifold and the V1, V2, V3 valves on the flexible hoses.
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Start the vacuum pump and let it run for about 3 minutes with the gas ballast valve open.
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Open the LOW, HIGH, REF and VAC valves on the manifold.
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After about 3 minutes, close the gas ballast valve and evacuate the system for about 30 minutes.
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Turn the vacuum pump off.
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Watch the vacuum gauge in order to check the system tightness by superimposing the red pointer and
the black pointer; let the system for a few minutes (max. 5) in the same conditions in which it was at
the end of the vacuum operations.
•
The possible worsening of the vacuum level means that the cooling system is not perfectly tight; it is
necessary to pinpoint the leak and repair it.
•
Close the VAC valve on the manifold.
ENGLISH
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