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(3) 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.
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
NO
Finish charging with refrigerant. Finish draining out refrigerant. Finish draining out refrigerant.
Note: 1
Note: 2
Note: 5
Note: 6
Note: 7
Note: 3
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.
After adjusting the refrig-
erant volume, run for 5
minutes and judge the AL.
After adjusting the refrig-
erant volume, run for 5
minutes and judge the AL.