Pump-Down Operation; Troubleshooting - Toshiba RAS-2M18G3AVG-E Installation Manual

Outdoor Unit
10

Pump-down Operation

Pump-down Operation (Recovering refrigerant)
CAUTION
Since the forcible running for collecting
refrigerant stops automatically after
10 minutes, 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 ashing (1 time/sec.).
D800 D801
5. Press SW01 for 1 time. Then D804 light is ashing (5 times/sec.).
D800 D801
6. Press SW02 for 1 time. Then D805 light is ashing (5 times/sec.).
D800 D801
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 D801
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 nished in maximum 10 minutes.
After the collection is 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.
11

Troubleshooting

You can perform fault diagnosis of the outdoor unit with the LEDs on the P.C.
board of the outdoor unit in addition to using the check codes displayed on
the remote controller of the indoor unit.
Use the LEDs and check codes for various checks. Details of the check
codes displayed on the remote controller of the indoor unit are described in
the Installation Manual of the indoor unit.
LED displays and check codes
Display
D800 D801 D802 D803
(YL) (YL) (YL) (YL)
*
*
* *
*
* *
* *
* * *
*
*
* *
*
* *
* *
* * *
*
*
D805
* *
* *
*
*
* *
15
Installation Manual
D802 D803
D802 D803
D802 D803
D802 D803
: ON ( * : 3 sec ON/0.5 sec OFF),
Indoor
check
D804 D805
code
(YL) (GN)
- Normal operation (no error)
1C Compressor case thermostat error
21 High pressure switch error
1C Compressor system error
1D Compressor lock
1F Compressor breakdown
14 Driving element short circuit
16 Position detection circuit error
17 Current detection circuit error
*
1C Communication error between MCU
*
* 1A Fan system error
* 1E Discharge temperature error
Discharge temperature sensor
* 19
(TD) error
Outdoor air temperature sensor
1B
*
(TO) error
Suction temperature sensor (TS)
18
*
error
Heat exchanger temperature
* 18
sensor (TE) error
Gas pipe (unit A) temperature
1C
*
sensor (TGa) error
Gas pipe (unit B) temperature
1C
*
sensor (TGb) error
Gas pipe (unit C) temperature
* 1C
sensor (TGc) error
- PMV error (SH 20)
*
* - PMV error (SH –8)
* * 20 PMV leakage error (unit A)
20 PMV leakage error (unit B)
* *
20 PMV leakage error (unit C)
* *
* * - Miswiring (mispiping) check error
D804 D805
¯
D804 D805
D804 D805
D804 D805
¯
: OFF
Description