12
8. Test run
8.1. Before test run
► After installation of indoor and outdoor units, and piping and electric wir-
ing work, recheck that the unit is free from leaks of refrigerant, loosened
connections, and incorrect polarity.
► Measure an impedance between the power supply terminal block (L, N,
)
on the units and the ground with a 500 V Megger and check that it is equal
to or greater than 1.0 M
Ω
.
7. Installing the grille
Fig. 7-11
7.5. Installing the intake grille (Fig. 7-11)
• Perform the procedure that is described in “7.2. Preparing to attach the grille” in
reverse order to install the intake grille and the corner panel.
Refrigerant piping of the main unit
Drain piping of the main unit
Corner panel
* Installation in any position is possible.
Position of the levers on the intake grille when sent from the factory.
* Although the clips can be installed in any of four positions.
7.6. Check
• Make sure that there is no gap between the unit and the grille, or between the
grille and the surface of the ceiling. If there is any gap between the unit and the
grille, or between the grille and the surface of the ceiling, it may cause dew to
collect.
• Make sure that the wires have been securely connected.
8.2. Test run
■
Refer to the installation manual that comes with each remote controller for de-
tails.
8.3. Self-check
■
Refer to the installation manual that comes with each remote controller for de-
tails.
■
RF thermostat is not established.
Errors detected by indoor unit
Wired remote controller
RF thermostat
Symptom
Remark
Check code
P1
Intake sensor error
P2
Pipe (TH2) sensor error
P9
Pipe (TH5) sensor error
E6, E7
Indoor/outdoor unit communication error
P4
Drain sensor error
P5
Drain pump error
PA
Forced compressor error
P6
Freezing/Overheating safeguard operation
EE
Communication error between indoor and outdoor units
P8
Pipe temperature error
E4
Remote controller signal receiving error
Fb
Indoor unit control system error (memory error, etc.)
Errors detected by unit other than indoor unit (outdoor unit, etc.)
Wired remote controller
RF thermostat
Symptom
Remark
Check code
E9
Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
For details, check the LED dis-
play of the outdoor controller
board.
UP
Compressor overcurrent interruption
U3, U4
Open/short of outdoor unit thermistors
UF
Compressor overcurrent interruption (When compressor locked)
U2
Abnormal high discharging temperature/49C worked/insufficient refrigerant
U1, Ud
Abnormal high pressure (63H worked)/Overheating safeguard operation
U5
Abnormal temperature of heat sink
U8
Outdoor unit fan safeguard stop
U6
Compressor overcurrent interruption/Abnormal of power module
U7
Abnormality of super heat due to low discharge temperature
U9, UH
Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to
main circuit/Current sensor error
