Daikin FCQ18PVJU Service Manual page 51

SiUS28-902_a
U4
No power is supplied to the outdoor unit.
The shutoff valve of an outdoor unit is left
closed.
UF
If the right indoor unit piping and wiring are
not properly connected to the outdoor unit.
If the interunit wiring has not be connected
UH
or it has shorted.
1.1.4 Confirmation on Normal Operation
• Conduct normal unit operation after the check operation has been completed.
• Confirm that the indoor/outdoor units can be operated normally.
• Operate indoor unit to check that the corresponding outdoor unit operates.
• Confirm that the indoor unit discharges cold air (or warm air).
• Operate the air direction control button and flow rate control button to check the function of
Test Operation
(When outdoor air temperature is 82°FDB or higher, the unit can not be operated with
heating mode. See the installation manual attached.)
When an abnormal noise due to liquid compression by the compressor can be heard, stop
the unit immediately, and turn on the crankcase heater to heat up it sufficiently, then start
operation again.
the devices.
Turn the power on for the outdoor unit.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
Make sure that the right indoor unit piping and wiring are properly
connected to the outdoor unit.
Make sure the interunit wiring is correctly attached to terminals
(X2M) F1/F2 (TO IN/D UNIT) on the outdoor unit circuit board.
Test Operation
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