Toshiba RAS-2M21U2ACVG-SG Service Manual page 55

10-2-8. Grounding
This air conditioner must be grounded without fail.
• Grounding is necessary not only to safeguard against the possibility
of receiving an electric shock but also to absorb both static, which is
generated by high frequencies and held in the surface of the outdoor unit,
and noise since the air conditioner incorporates a frequency conversion
device (called an inverter) in the outdoor unit.
• If the air conditioner is not grounded, users may receive an electric shock
if they touch the surface of the outdoor unit and that unit is charged with
static.
10-2-9. Test run
Wiring/Piping Check
■
CAUTION
Electric current is applied on the
control board. Beware of electric
shock.
1. Remove the valve cover screws.
2. Pull the valve cover in the direction of arrow, and remove it.
D801
D800
3. Turn on the circuit breaker to supply electricity.
In the initial LED display status, D805 is lighted as below.
: ON,
 
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.)
4. After 5 minutes, hold down SW01 for at least 5 seconds, and check that
D800 is lighted and D804 light is fl ashing ( 1 time/sec.).
D800 D801 D802
  
5.
Press the SW01 4 times until the LED is displayed as below.
D800 D801 D802
  
6.
Press SW02 for 1 times. Then D805 light is flashing (5 times/sec.).
D800 D801 D802
  
7. Hold down SW02 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
  
Valve cover
LED Service switches
D803 D805 SW02
D802 D804 SW01
: OFF, : Rapid Flashing (5 times/sec.),
: Slow Flashing (1 time/sec.)

D803 D804 D805
  
D803 D804 D805
  
D803 D804 D805
 
D803 D804 D805

D803 D804 D805
  
D803 D804 D805
  
8.
The below is displayed when the error is detected.
(* Repetition of 3 sec ON / 0.5 sec OFF)
D800 D801
* *
Press the SW01 3 times until the LED is displayed as below, to check the
room judged as error.
D800 D801
 
Incorrect wiring/piping can be checked by pressing SWO2. The Led is
displayed as below. Turn off the circuit breaker, then check wiring/piping
again.
D800 D801 D802
  
  
  
  
  
  
  
  
• The D800 LED represents unit A.
• The D801 LED represents unit B.
• The D802 LED represents unit C.
9. When you want to start over the operation of the SW01 and SW02, press
the SW01 and the SW02 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.
10. 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.
• You cannot check wiring/piping when the external temperature is low.
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 connection is normal.
Gas Leak Inspection
■
Refer to the " Gas Leak Inspection".
Test run
■
For the test run, be sure to satisfy the following conditions below:
- Perform the test run for each indoor unit respectively.
- Perform the test run for about 10 minutes in the cooling mode.
• You can perform the test run in the cooling mode by utilizing the thermo
sensor of the indoor unit.
Cooling mode: Warm the thermo sensor using an appliance such as
a hair dryer.
Instructions for the Customers
■
• Explain to the customers the proper operation procedure and let them
operate the air conditioner along with the supplied instruction manual.
• When you start running the indoor unit or change the operation mode, the
unit starts running after 3 minutes. This is due to the protection function of
the unit, not a malfunction.
• When the external temperature becomes low, the pre-heating of the
compressor starts to protect it. Keep the circuit breaker on for use.
The electricity consumption during pre-heating is about 30 W.
If the circuit breaker is turned off, the indoor unit may not start running
for about 10 minutes or more.
Electronic expansion valves are used for the outdoor unit.
•
When you turn on the power, the outdoor unit starts clattering every 1 or
2 months. This clattering is not a malfunction, but occurs when the unit is
returning to the default setting for optimized control.
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D802 D803 D804
* * *
D802 D803 D804
  
Check result
D803 D804 D805 Description
Normal operation (no error)
  
Trouble in unit A
  
Trouble in unit B
  
Trouble in unit C
  
Trouble in unit A and B
  
Trouble in unit A and C
  
Trouble in unit B and C
  
Trouble in unit A, B and C
  
D805

D805