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Evacuation of the cooling system
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Connect the T1 flexible hose to the low pressure connection of the cooling system.
•
Connect the T2 flexible hose to the high pressure connection of the cooling system. In case the
system has got only one connection (LOW), please refer to the instructions concerning the T1
hose only.
•
Open the LOW and HIGH valves on the manifold and make sure that the REF valve is closed.
•
Open the V1 and V2 valves on the T1 and T2 hoses and make sure that the V3 valve on the T3 hose is
closed.
•
Open the VAC valve on the manifold.
•
Start the vacuum pump and let it run for about 3 minutes with the gas ballast valve open.
•
After about 3 minutes, close the gas ballast valve and evacuate the system for about 30 minutes.
•
Turn the vacuum pump off.
•
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.
Warning! Do not forget to close the VAC valve before the following charging operation
otherwise the vacuum gauge will break!
Charing refrigerant in the cooling system
•
Close all the valves on the manifold.
•
Close the V1, V2 and V3 valves on the T1, T2 and T3 hoses. In case the system has got only one
connection (LOW), please refer to the instructions concerning the T1 hose only.
•
Take a bottle containing the suitable refrigerant to work with the cooling system and place it upside
down on the V3 valve on the T3 hose (situated on the electric scale); the bottle will be opened
automatically by the pin on the V3 valve.
Warning! The refrigerant charge must be performed ONLY in liquid phase.
•
Open the V3 valve on the T3 hose and let the T3 hose become saturated by refrigerant.
•
Open the LOW valve on the manifold and the V1 valve on the T1 hose, if you want to charge only
from the low pressure side.
•
Open the HIGH valve on the manifold and the V2 valve on the T2 hose, if you want to charge only
from the high pressure side.
•
Open the LOW and HIGH valves on the manifold and the V1 and V2 valves on the T1 and T2 hoses, if
you want to charge refrigerant from both sides.
•
Open the REF valve on the manifold and check on the scale display the refrigerant quantity that has
been charged.
•
Close the REF valve on the manifold as soon the quantity of refrigerant requested for a correct use of
the HVAC system has been charged.
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