Toshiba 13342 Installation Manual - Page 15

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Outdoor Unit

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

D801

5. Press SW01 for 1 time. Then D804 light is ﬂ ashing (5 times/sec.).

D800

D801

6. Press SW02 for 1 time. Then D805 light is ﬂ 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 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.

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)

D805

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)

Compressor case thermostat error

High pressure switch error

Compressor system error

Compressor lock

Compressor breakdown

Driving element short circuit

Position detection circuit error

Current detection circuit error

Communication error between MCU

Fan system error

Discharge temperature error

Discharge temperature sensor

(TD) error

Outdoor air temperature sensor

(TO) error

Suction temperature sensor (TS)

error

Heat exchanger temperature

sensor (TE) error

Gas pipe (unit A) temperature

sensor (TGa) error

Gas pipe (unit B) temperature

sensor (TGb) error

Gas pipe (unit C) temperature

sensor (TGc) error

PMV error (SH≥20)

PMV error (SH≤–8)

PMV leakage error (unit A)

PMV leakage error (unit B)

PMV leakage error (unit C)

Miswiring (mispiping) check error

D804

D805

D804

D805

D804

D805

D804

D805

: OFF

Description