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2. Servicing the liquid cooling circuit
Check within 24 hours whether the pressure has stabilized close to 1 bar. If not, search for leakage.
2.7 Calibrating the liquid cooling circuit
To check if the pressure vessel is correctly calibrated you may connect the syringe with the cooling circuit
and measure the amount of liquid that is automatically expelled. The pressure would have dropped from 1 to
0 bar. The expelled amount of cooling liquid should be between 50 and 70 ml. Make sure that there are no air
bubbles in the syringe while doing this. Reinject the expelled liquid back into the circuit. The pressure would
hence return to 1 bar.
A calibrated liquid cooling circuit means that the ratio between the volume of cooling liquid in the circuit and
the volume of air in the pressure vessel is defined. This is achieved by first filling the vessel completely with
liquid consequently expelling air from the vessel. Secondly a predefined volume of cooling liquid is extracted
from the circuit. Finally theliquid cooling circuit has to be pressurized to 1 bar by pumping air into the vessel.
Make sure that all air is expelled from the liquid cooling circuit before starting the calibration procedure.
Necessary tools
• 60 cm of plastic tube with female valved fitting.
• Syringe co nnected with short t ube with male v alved fitting.
• Bottle with cooling liquid.
•Airpump.
• Cloths.
How to calibrate the liquid cooling circuit ?
1. Remove the valve cap of the pressure vessel and release the pressure.
Image 2-15
2. Fill the syringe with cooling liquid as follows:
a) Couple the female (F) fitting of a plastic tube to male (M) fitting of the syringe and emerge the tube end. Make sure th at the
piston of the syringe is completely pressed in.
b) Extract cooling liquid into the syringe by pulling out the piston.
c) Turn the syringe upside dow n, so that the air inside the syringe is located at the outlet.
d) Push the piston in until allair bubbles inside t
he syringe andtubes are expelled. Ensure thatthe tube end in the bottle remains
emerged.
e) Pull out the piston to fill the tubes and syringe completely with cooling liquid.
f) Disconnect the filled syringe from the tube.
R59770032 COOLING LIQUID REFURBISHMENT 07/12/2006
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