Panasonic WH-MDF09C3E5 Installation Manual page 52

Installation of heating and refrigeration circuits for split systems
Evacuating the refrigerant circuit
7 – 52 Aquarea air/water heat pump – Installation manual for monobloc and split systems C, D and E series 05 / 2014
Evacuate the system as follows:
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Connect the filling hose on the low-pressure side of the manometer
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station and the service connection of the 3-way directional valve .
Ensure that you connect the end of the filling hose to the service
connection with the pin .
Connect the middle hose of the manometer station to a vacuum
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pump with a non-return valve or a vacuum pump with an adapter .
Switch on the vacuum pump until the pressure has dropped
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to a measured value of -1 bar . Evacuate the system for roughly
30 minutes .
Close the valve on the low-pressure side of the manometer station
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and switch off the vacuum pump .
Observe the measured value . It should remain constant for
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10 minutes . If it does not, there is a leak in the refrigerant circuit .
If the manometer display does not reach a constant value of -1 bar,
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tighten the connections . Repeat the above procedure to evacuate
the system . If the measured value of -1 bar is still not reached, find
and repair the leak .
When the manometer display shows a constant pressure of -1 bar,
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disconnect the hose from the vacuum pump and the service con-
nection of the 3-way directional valve .
Tighten the sealing cap of the service connection of the 3-way
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directional valve using a torque wrench to a torque of 18 Nm .
Remove the valve caps of the valve spindles of the 2-way and
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3-way directional valves .
Open the two valves using an Allen key (size 4) .
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Re-attach the valve caps of the valve spindles for the 2-way and
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3-way directional valves .
Check the connections for leaks .
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