Refrigeration Cycle - Toshiba RAS-3M18S3AV-E Service Manual

Pump-down Operation
Pump-down Operation (Recovering refrigerant)
■
CAUTION
Since the forcible running for collecting
refrigerant stops automatically after 10
minutes, fi nish collecting refrigerant within
10 minutes.
Electric current is applied on the
control board. Beware of electric
shock.
• The following must be certainly done
during pump down.
• Do not incorporate air into the

refrigeration cycle.

• Close the service valves. Stop the
compressor and remove the refrigerant
pipe.
If the refrigerant pipe is removed when
the compressor is operating and service
valves are opened, the refrigerant cycle
will inhale unwanted matter such as air
and the pressure in the cycle becomes
abnormally elevated. It may cause a
burst or injury.
1. Remove the valve cover screws.
2. Pull the valve cover in the direction of arrow, and remove it.
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 checking procedure cannot be completed if the cooling mode is not
operated in every indoor units.
Valve cover
LED Service switches
D801 D803 D805 SW02
D802 D804 SW01
: OFF, : Rapid Flashing (5 times/sec.),

: Slow Flashing (1 time/sec.)

D803 D804
 
4. Hold down SW01 for at least 5 seconds, and check that D800 is lighted
and D804 light is fl ashing ( 1 time/sec.).
D800

5. Press SW01 for 1 time. Then D804 light is fl ashing (5 times/sec.).
D800

6. Press SW02 for 1 time. Then D805 light is fl ashing (5 times/sec.).
D800

7. Hold down SW02 for at least 5 seconds. Then outdoor unit start cooling
mode.
(The display is kept during the refrigerants collection operation.)
D800

8. Close the valve stem of the service valve at the liquid end.
9. Make sure that the compound pressure gauge reading is –101 kPa
(–76 cmHg)
10. Close the valve stem of the service valve at the gas end.
11. The refrigerants collection operation is fi nished in maximum 10 minutes.
After the collection is fi nished, promptly stop the operation of all the
indoor unit.
(There are cases that the compressor restarts.)
12. When you want to start over the operation of the SW01 and SW02, press
the SW01 and SW02 at the same time for 5 sec. (It back to the initial
condition of 3.)
However, do not execute the operation during the refrigerants collection.
If by any chance the collection is stopped by the operation, start over the
refrigerants collection operation.
D805

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FILE NO. SVM-15102
D801 D802 D803
  
D801 D802 D803
  
D801 D802 D803
  
D801 D802 D803
  
D804 D805
 
D804 D805

D804 D805
D804 D805
 