When the system is depressurized, mount a manometer on the valve thread on top of theexpansion tank.4 Using the hand terminal, select Test > Converter coolingand—from the control window thatappears—verify that the transducer pressure is: 0 (± 0.1) bar.5 If the expansion tank pressure measured with the manometer is:5.1 Too low, add pressure with an air pump.5.2 Too high, adjust the pressure with the valve on the expansion tank.5.3 Lower than 0.3 bar, replace the expansion tank.6 Re-fit the yellow valve protector.