Mitsubishi Electric PUHZ-HA2 Installation Manual download pdf (Page 9)

7.1. Before test run

s After completing installation and the wiring and piping of the indoor and outdoor

units, check for refrigerant leakage, looseness in the power supply or control

wiring, wrong polarity, and no disconnection of one phase in the supply.

s Use a 500-volt megohmmeter to check that the resistance between the power

supply terminals and ground is at least 1.0M

ΩΩ

Ω.

s Do not carry out this test on the control wiring (low voltage circuit) terminals.

Warning:

Do not use the air conditioner if the insulation resistance is less than 1.0M

ΩΩ

Ω.

Insulation resistance

After installation or after the power source to the unit has been cut for an extended

period, the insulation resistance will drop below 1 MΩ due to refrigerant accumulat-

ing in the compressor. This is not a malfunction. Perform the following procedures.

1. Remove the wires from the compressor and measure the insulation resistance of

the compressor.

2. If the insulation resistance is below 1 MΩ, the compressor is faulty or the resist-

ance dropped due the accumulation of refrigerant in the compressor.

3. After connecting the wires to the compressor, the compressor will start to warm

up after power is supplied. After supplying power for the times indicated below,

measure the insulation resistance again.

• The insulation resistance drops due to accumulation of refrigerant in the com-

pressor. The resistance will rise above 1 MΩ after the compressor is warmed

up for four hours.

(The time necessary to warm up the compressor varies according to atmos-

pheric conditions and refrigerant accumulation.)

• To operate the compressor with refrigerant accumulated in the compressor,

the compressor must be warmed up at least 12 hours to prevent breakdown.

4. If the insulation resistance rises above 1 MΩ, the compressor is not faulty.

Caution:

• The compressor will not operate unless the power supply phase connection

is correct.

• Turn on the power at least 12 hours before starting operation.

- Starting operation immediately after turning on the main power switch can result in

severe damage to internal parts. Keep the power switch turned on during the op-

erational season.

s The followings must be checked as well.

• The outdoor unit is not faulty. LED1 and LED2 on the control board of the outdoor

unit flash when the outdoor unit is faulty.

• Both the gas and liquid stop valves are completely open.

• A protective sheet covers the surface of the DIP switch panel on the control board of

the outdoor unit. Remove the protective sheet to operate the DIP switches easily.

7. Test run

7.2. Unit replacement operation

s When reusing existing pipes that carried R22 refrigerant, replacement op-

eration must be performed before performing a test run.

• If new pipes are used, these procedures are not necessary.

• If existing pipes that carried R22 refrigerant are used for RP35-71 models, these

procedures are not necessary. (The replacement operation cannot be performed.)

Replacement operation procedures

1 Supply power.

2 Set DIP switch SW8-2 on the control board of the outdoor unit to ON to start

replacement operation.

* The replacement operation is performed using the cooling system. Cool air will

flow from the indoor unit during the replacement operation.

* During the replacement operation,

TEST RUN

is displayed on the remote controller

and LED1 and LED2 on the control board of the outdoor unit flash together.

3 The duration of the replacement operation is determined by the length of the pip-

ing. Always perform the replacement operation for longer than the stipulated time.

* Use one of the following methods to complete the replacement operation. When

the replacement operation ends, the unit will automatically stop.

(1) Set SW8-2 from ON to OFF (when ending a replacement operation of less

than 2 hours).

• Because the replacement operation restarts each time SW8-2 is set from

OFF to ON, always perform the replacement operation for longer than the

stipulated time.

Required replacement operation times

(2) Allow the replacement operation to automatically stop after 2 hours (operation

stops while SW8-2 is still in the ON position).

• When the replacement operation has ended automatically after 2 hours of

operation, there is no need to set SW8-2 from ON to OFF; normal air condi-

tioning operation is possible with SW8-2 set to ON. However, to repeat the

replacement operation, SW8-2 first has to be set to OFF and then to ON.

* If the indoor temperature is less than 15°C, the compressor will operate inter-

mittently but the unit is not faulty.

7.3. Test run

7.3.1. Using SW4 in outdoor unit

SW4-1 ON

Cooling operation

SW4-2 OFF

SW4-1 ON

Heating operation

SW4-2 ON

* After performing the test run, set SW4-1 to OFF.

• After power is supplied, a small clicking noise may be heard from the inside of the

outdoor unit. The electronic expansion valve is opening and closing. The unit is not

faulty.

• A few seconds after the compressor starts, a clanging noise may be heard from the

inside of the outdoor unit. The noise is coming from the check valve due to the small

difference in pressure in the pipes. The unit is not faulty.

The test run operation mode cannot be changed by DIP switch SW4-2 during

the test run. (To change the test run operation mode during the test run, stop

the test run by DIP switch SW4-1. After changing the test run operation mode,

resume the test run by switch SW4-1.)

7.3.2. Using remote controller

Refer to the indoor unit installation manual.

Pipe Length Replacement Operation Time

0 to 20 meters 30 minutes or more

21 to 30 meters 45 minutes or more

31 to 50 meters 60 minutes or more

8. Initial settings for refrigerant leakage detection function

This air conditioner (outdoor unit) can detect refrigerant leakage which may happen

during a long period of use. In order to enable the leakage detection, the following

settings are required to let the unit menorize the initial conditions (initial learning).

Caution:

Make sure to perform the “7.Test run” and confirm the unit works without any

problems, before starting the following settings.

s How to select the “Refrigerant Leakage Detection” mode

Detection is possible regardless the unit’s operation (ON or OFF).

1 Press

TEST

button for more than three seconds to switch to the maintenance

mode.

[Display A]

MAINTENANCE

s How to start the initial learning

2 Press

CLOCK button and select the [GAS LEAK TEST START] (Fig. 8-2)

* The initial learning for the leakage detection is always done once after the new

installtion or the data reset.

[Display A]

■ Remote control button positions

C B

Operation mode

Compressor information

Outdoor unit information

Indoor unit information

Confirm

Activate/cancel maintenance mode

GAS LEAK

JUDGE

GAS LEAK

TEST START

Refrigerant leakage

detection judgment

Refrigerant

leakage detection

(initial teaching)

Fig. 8-1

Fig. 8-2

1 2 3 4 5 6 7 8 9 10 11 12

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Mitsubishi Electric PUHZ-HA2 Installation Manual Page 9

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