Toshiba MM-A0280HT Service Manual page 111

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) Source power and initial setup check
Does the operation
lamp of the remote
controller light?
Does the LCD display
on the remote controller
show "STANDBY"?
Is an alarm code
displayed on the
remote controller?
(2) Fan operation check
Set the operation mode
to "FAN" by pushing the
operation switch.
Is air discharged
from the discharge port
18
abnormal sound?
Check each indoor unit consecutively.
Procedure and Summary of Trial Operation
No
Yes
Yes
No
Yes
No
Normal
Start
No
of indoor unit?
Yes
Is there an
Yes
No
Normal
Trial Operation
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.
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.
Refer to Check code displayed on remote controller, outdoor unit
and check positions.
Check indoor fan, fan motor, and fan circuit.
Check peripherals of the fan.
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