Toshiba RAS-M10PKVP-E Service Manual page 86

10-4-8. Check and Test Operation
NOTE
For R410A, use the leak detector exclusively
manufactured for HFC refrigerant (R410A, R134a, etc.).
∗ The conventional leak detector for HCFC refrigerant
(R22, etc.) cannot be used because its sensitivity for
HFC refrigerant lowers to approx. 1/40.
• Pressure of R410A becomes approx. 1.6 times of
that of R22. If installation work is incompletely
finished, a gas leakage may occur in the cases such
as pressure rise during operation. Therefore, be sure
to test the piping connections for leaking.
Check places for indoor unit
Check places for outdoor unit
Fig. 10-4-18
• Check the flare nut connections, valve stem cap
connections and service port cap connections for
gas leak with a leak detector or soap water.
CAUTION
• Use a circuit breaker of a type that is not tripped by
shock waves.
• If incorrect / incomplete wiring is carried out, it will
cause an electrical fire or smoke.
• Prepare the power supply for exclusive use with the
air conditioner.
• This product can be connected to the mains.
Connection to fixed wiring :
A switch or circuit breaker which disconnects all
poles and has a contact separation of at least 3 mm
must be incorporate in the fixed wiring.
An approved short circuit breaker or switches must
be used.
∗ (A breaker having a sensitivity of approximately
0.1 second or less and a capacity of
approximately 30 mA is usually used.)
10-4-9. Miswiring (Mispiping) Check
Make sure that the wiring and piping for each room
have the same alphabetical codes (A, B, C, D).
Connect and secure the power cord.
Use the power cord / cables with thickness, type and
protective devices specified in this manual.
Insulate the unused cords (conductors) with PVC tape.
1. Detach the front panel of the outdoor unit.
Do not remove the air discharge grille.
2. Turn on the circuit breaker to supply electricity.
3. Start running all the indoor units connected to the
outside unit in the cooling mode.
• You need not specify the temperature setting of
the indoor units.
• You cannot check wiring / piping when the
external temperature is 5 °C or less.
4. Turn on the SW802 No.4 switch on hte P.C. board
MCC 5071.
The wiring / piping check starts automatically.
While checking, each LED flashes consecutively to
indicate that the checking each indoor unit is in
progress. When checking is complete, the check
result is displayed on the LED panel.
See the table below for details.
4-1. If no problems are detected.
The checking operation returns to the normal
operation automatically.
The compressor stops temporarily, then it restarts.
The D801 LED flashes while the compressor is
stopped.
4-2. If incorrect wiring / piping is detected.
The checking operation stops.
Check the status of the LED to confirm the details of
the problem. Turn off the circuit breaker, then check
wiring / piping again.
5. Turn off SW802 No.4 switch on the P.C. board MCC
5071.
• The checking operation changes to the normal
operation.
LED
Normal
Check
– 86 –
Fig. 10-4-19