MITSUBISHI ELECTRIC P500YMF-C User Manual

Page 66

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Refrigerant adjustment in heating season (Flow chart)

In case of PURY-P400, 500YMF-C

Start

Adjustment

Has the operating

condition stabilized?

Is the

accumulator's liquid level

AL = 0?

Did the liquid level

change from AL = 0 to

AL = 1?

Did the liquid level

change from AL = 1 to

AL = 0?

Did the liquid level

change from AL = 2 to

AL = 1?

Is the

accumulator's liquid level

AL = 1?

Is the

accumulator's liquid level

AL = 1?

Is the accumulator's

liquid level AL=0 when just one indoor

unit is running.

Adjustment is

not necessary.

Run all the indoor units in the
heating condition in the test run
mode.

Turn on switches No. 1, 2, 4, 5 and 6
of the self-diagnosis switch (SW1),
switching to the mode in which the
liquid level is displayed by the LED.

Determine the difference between
the volume of refrigerant needed for
heating and the volume needed for
cooling and charge with that amount.

Charge with small amounts of
refrigerant at a time through the
low pressure service port.

Drain out small amounts of
refrigerant at a time from the low
pressure service port.

Draining out approximately 5 kg
of refrigerant.

Turn all of switches of
SW1 OFF.

Adjustment

complated.

Adjustment

complated.

Readjust.

YES

Finish charging with refrigerant.

Finish draining out refrigerant.

Note: 1

Note: 2

Note: 5

Note: 6

Note: 7

Note: 3

Note: 4

AL = 1 or 2

AL = 2

If adjustment of the refrigerant volume was done by heating operation, it
is possible that accumulation of refrigerant due to the lengthened piping
could have a great influence, so it is recommended that operation be
checked during the cooling season.

Note: Do not let the drained out refrigerant escape to the outside atmo-

sphere.

After adjusting the refrig-
erant volume, run for 5
minutes and judge the AL.