Service manual

SiUS28-902_a Test Operation
Test Operation 44
1.1.4 Confirmation on Normal Operation
• Conduct normal unit operation after the check operation has been completed.
(When outdoor air temperature is 82°FDB or higher, the unit can not be operated with
heating mode. See the installation manual attached.)
• Confirm that the indoor/outdoor units can be operated normally.
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.
• 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
the devices.
U4
No power is supplied to the outdoor unit. Turn the power on for the outdoor unit.
UF
The shutoff valve of an outdoor unit is left
closed.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
If the right indoor unit piping and wiring are
not properly connected to the outdoor unit.
Make sure that the right indoor unit piping and wiring are properly
connected to the outdoor unit.
UH
If the interunit wiring has not be connected
or it has shorted.
Make sure the interunit wiring is correctly attached to terminals
(X2M) F1/F2 (TO IN/D UNIT) on the outdoor unit circuit board.