Lt.WARNING
• Never perform a test operation with the discharge piping thermistor(R2T) and suction piping thermistor(R3T)
removed, as this might break the compressor.
• If the technician must leave the outdoor unit for some reason, switch places with another installation technician
or close the plates. (It may cause electric shocks.)
( HOW TO TEST OPERATION) After the indoo_r a�d outdoor unit in_stallation, bE: sure to perform
.
. the test operation In accordance with the following procedure.
1. Open the stop valve cover and check that the liquid and gas sides of the stop valves are open.
<Be sure to close the front plate before the operation (there is a risk of electric shock)>
Note: After doing an air-purge with a vacuum pump, the refrigerant pressure may not rise even if the stop
valves are opened. This is because the refrigerant piping path is closed off by the outdoor unit
electronic expansion valve, etc. There are no problems if the unit is run.
2. Attach the stop valve cover to the outdoor unit and turn the power on at least 6 hours before operating the
outdoor unit to protect the compressor.
3. Set to COOLING operation with the remote controller.
4 Perform the test operation
• When doing trial operation, it may take about 1 minute until the compressor begins to function, but this is not abnormal.
• When using the system the first time after installation, even if heating operation is selected, cooling operation will take place
for about 3 to 5 minutes.
Thereafter, it will change to heating operation, but this is not abnormal.
(In this case, the remote controller display will continue to display
"heating operation.") This is in order to detect if someone has forgotten
to open the stop valve during trial operation.
• If the outside air temperature is about 24
°
C or more, even if HEATING
operation is set, the system may not operate, but this is not abnormal.
5. Operate normally.
6. Confirm function of the indoor and outdoor units according to the
operation manual.
( MALFUNCTION DIAGNOSIS)
• At the time of a test run, when the following malfunction code is displayed
on remote control, the fault of installation construction can be considered.
C
Q)
a.
0
<Gas side>
It turns until it removes
a valve lid and stops to
a counter clockwise rotation
by a 5mm hexagonal wrenches
Malfunction code
Installation error
Remedial action
[E3] [E5] [U0] [L8]
A failure of a stop valve to open
"Open" operation of a stop valve
[E3] [E5] [L4] [L8]
Closing of an air passage
Removing closing thing from air passage
[U1]
Missing phase, negative phase
2 Phase of power supply 3 Phase
{L 1, L2, L3 Phase) are replaced
[U2]
Power supply unbalancing
Unbalanced dissolution
[U4] [UFJ
Incorrect connection of field wiring Correction of wiring
[UA]
Connection of incompatible
Connect appropriate indoor unit
indoor unit
(Refer to the catalogue)
NO INDICATION
Mistake wiring or not connect
wiring of power supply, indoor,
To correct wiring or connect correctly
outdoor, field wiring between
indoor unit
• When malfunction codes other than the above are displayed on remote control, considering that the failure of
between an indoor and an outdoor unit may have.
For the malfunction codes, please refer to the indoor unit's installation manual or outdoor service manual.
(A malfunction code has what has a display according to the form of the interior of a room and an outdoor unit,
and the thing which is not.)
• The followings can be considered causes when the breaker for power supply trips.
- The capacity of a breaker for power supply is smaller than the required capacity of the leakage circuit breaker.
- The leakage circuit breaker is not compatible to the higher harmonic wave.
• In case of already checking all equipment that not have any problem, but found air conditioner not cooling.
Please re-che�k Motor_ operate valve coil not tighten or remove for 1
st
checking. If normally please re-confirm
Lt.
CAUTION
I
To persons incharge of piping work and electric work
I
• Please check having attached the front board and the piping cover after a test run end when giving production over to customer.
36
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