114
Inspection and trial operation
Measure to take when E505, E506 error occurs
Keep all the outdoor units in vacuum mode for 5 min .
- See the instructions on Key operation modes .
Perform Auto Trial Operation again
Yes
Yes
Yes
Open the valve .
No .
Is the ball valve (service valve) on each outdoor unit
opened?
Take corrective measures .
No .
Are the pressure sensor connectors properly
connected to the PBA?
Is the deviation between pressure sensors on
outdoor units greater than 0 .2MPa?
Replace the Hub PBA .
No .
Is the pin-to-pin voltage between pins #
3 and 4 of the pressure sensor terminal*
on the Hub PBA 5V?
Replace the pressure sensor .
No .
Is the actual pressure* different from the
value on the pressure sensor?
Yes
Yes
No .
*
The actual pressure can be checked by calculating the saturation
pressure for the outdoor air temperature or connecting a
manifold gauge .
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