Service manual

118
18
Trial Operation
Procedure and Summary of Trial Operation
Trial operation check
After “Check before trial operation”, implement a trial operation in the following procedure.
(Turn the power switch on and the crank case heater for 12 hours before a trial operation will
be completed.)
Check the trial operation for each indoor unit. When multiple indoor units are concurrently
operated check for misconnection, etc. of the refrigerant pipe and control wiring, errors can
occur. Therefore, set “STOP” for indoor units.
Flowchart of trial operation procedure
(1) Power source and initial setup check
Check power supply of the indoor unit.
Check wiring between indoor unit and remote controller.
Disconnect wires surrounding the control P.C. board of
indoor unit.
Check connector error.
Check transformer failure of indoor microprocessor.
Check remote controller error.
Check control P.C. board failure of indoor unit.
Does the operation
lamp of the remote
controller light?
No
Check for over capacity of the total connected indoor units.
Check power supply phase order of outdoor units.
Check incorrect setup of indoor unit HP rating (SW08).
Check the remote controller error.
Check control P.C. board failure of indoor unit.
Does the LCD display
on the remote controller
show “STANDBY”?
Yes
Yes
No
Refer to Check code displayed on remote controller, outdoor unit
and check positions.
Is an alarm code
displayed on the
remote controller?
Normal
Yes
No
Start
Set the operation mode
to "FAN" by pushing the
operation switch.
Is air discharged
from the discharge port
of indoor unit?
Normal
Check each indoor unit consecutively.
Check indoor fan, fan motor, and fan circuit.
Check peripherals of the fan.
No
Yes
Is there an
abnormal sound?
Yes
No
(2) Fan operation check