Miswiring (Mispiping) Check - Toshiba RAS-4M27U2AVG-E Service Manual

10-2-8. 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.
CAUTION
Electric current is applied on the
control board. Beware of electric
shock.
1. Detach the front panel of the outdoor unit.
Do not remove the air discharge grille.
LED
2. Turn on the circuit breaker to supply electricity.
In the initial LED display status, D805 is lighted as below.
○ : ON, ● : OFF, ⌾ : Rapid Flashing (5 times/sec.),
D800 D801 D802
● ●
Start running all the indoor units connected to the outdoor unit in the
cooling mode.
(The indoor unit in the room that doesn't operate the cooling mode cannot
be checked.)
3. After 5 minutes, hold down SW801 for at least 5 seconds, and check
that D800 is lighted and D804 light is fl ashing (1 time/sec.).
D800 D801 D802
○ ●
4. Press the SW801 4 times until the LED is displayed as below.
D800 D801 D802
● ●
5. Press SW802 for 1 times. Then D805 light is fl ashing (5 times/sec.).
D800 D801 D802
● ●
6. Hold down SW802 for at least 5 seconds. Then the wiring/piping
check starts automatically. (The LED display is lighted for a moment.)
D800 D801 D802
● ●
• If no problems are detected, the checking operation returns to the
normal operation automatically. The LED is displayed as below.
D800 D801 D802
● ●
SW801
◇ : Slow Flashing (1 time/sec.)
D803 D804
● ● ●
D803 D804
● ● ◇
D803 D804
○ ● ⌾
D803 D804
○ ● ⌾
D803 D804
○ ● ◇
D803 D804
● ● ●
7. The below is displayed when the error is detected.
(* Repetition of 3 sec ON / 0.5 sec OFF)
D800
○*
Press the SW801 3 times until the LED is displayed as below, to check
the room judged as error.
D800
●
Incorrect wiring/piping can be checked by pressing SW802. The LED is dis-
played as below. Turn off the circuit breaker, then check wiring/piping again.
D800 D801 D802 D803 D804 D805
● ●
○ ●
● ○
● ●
● ●
○ ○
○ ●
○ ●
● ○
● ○
● ●
○ ○
○ ○
○ ●
● ○
○ ○
○ ○
• The D800 LED represents unit. A.
D805
• The D801 LED represents unit. B.
○
• The D802 LED represents unit. C
• The D803 LED represents unit. D.
8. When you want to start over the operation of the SW801 and SW802,
press the SW801 and the SW802 at the same time for 5 sec. (The
procedure will set back to step 3.) However, do not execute the operation
during the check. If by any chance the check is stopped by the operation,
start over the check after turning off the power once.
D805
9. Notes
●
• It sometimes takes about 30 minutes maximum for the check.
• During the check, the compressor and the fan of the outdoor/indoor
unit repeat ON/OFF.
D805
• You cannot check wiring/piping when the external temperature is 5°C
●
or less. Also, there is a possibility to misjudge if the indoor
temperature becomes too low by cooling operation. In that case,
execute the cooling operation for per room and check if the
D805 connection is normal.
⌾
D805
○
D805
○
- 67 -
FILE NO. SVM-18052
D801 D802 D803
○* ○* ○*
D801 D802 D803
○ ● ●
○ ● ◇
: ON, : OFF, : Slow Flashing (1 time/sec.)
Check results
● ● ● ◇
Normal operation (no error)
● ● ● ◇
Trouble in unit A
● ● ● ◇
Trouble in unit B
○ ● ● ◇
Trouble in unit C
● ○ ● ◇
Trouble in unit D
● ● ● ◇
Trouble in units A and B
○ ● ● ◇
Trouble in units A and C
● ○ ● ◇
Trouble in units A and D
○ ● ● ◇
Trouble in units B and C
● ○ ● ◇
Trouble in units B and D
○ ○ ● ◇
Trouble in units C and D
○ ● ● ◇
Trouble in units A, B, and C
● ○ ● ◇
Trouble in units A, B, and D
○ ○ ● ◇
Trouble in units A, C, and D
○ ○ ● ◇
Trouble in units B, C, and D
○ ○ ● ◇
Trouble in units A, B, C and D
Trouble in all units
○ ○ ○ ◇
service valve stays closed
D804 D805
○* ○
D804 D805
● ⌾
Description